Dr. David Mozurkewich Profile

Dr. David Mozurkewich

Astronomer

SPIE Involvement:

Author

Area of Expertise:

astronomy , remote sensing , interferometry

Publications (84)

Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

The Navy Precision Optical Interferometer: large-aperture observations and infrastructure improvements

Gerard van Belle, James Clark, Henrique Schmitt, David Noble, Anders Jorgensen, David Mozurkewich, J. Thomas Armstrong, Ellyn Baines, Merrick DeWitt, Ty Martinez, Sergio Restaino, Jordan Stone, Thomas Coleman, Ben Hardesty, Wyatt Clark, Khristian Jones, Bradley Kingsley, Erin Maier, Solvay Blomquist, Nicholas Green, Peter Kurtz

Proceedings Volume 12183, 1218304 (2022) https://doi.org/10.1117/12.2630572

KEYWORDS: Telescopes, Interferometers, Observatories, Adaptive optics, Mirrors, Precision optics, Interferometry, Control systems, Stars

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

The Navy Precision Optical Interferometer: two years of development towards large-aperture observations

Gerard van Belle, James Clark, J. Thomas Armstrong, Ellyn Baines, Ty Martinez, Sergio Restaino, Henrique Schmitt, Anders Jorgensen, David Mozurkewich, Teznie Pugh, Wyatt Clark, Nicholas Green, Khristian Jones, Bradley Kingsley, Peter Kurtz, Adam Schilperoort

Proceedings Volume 11446, 1144608 (2020) https://doi.org/10.1117/12.2562806

KEYWORDS: Precision optics, Interferometers, Telescopes, Imaging systems, Electron multiplying charge coupled devices, Cameras, Image processing, Interferometry, Image restoration, Adaptive optics

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Proceedings Article | 9 July 2018 Presentation + Paper

Presentation + Paper

Coherent integration: theory and practice

D. Mozurkewich, Anders Jorgensen

Proceedings Volume 10701, 107011N (2018) https://doi.org/10.1117/12.2311817

KEYWORDS: Visibility, Data modeling, Calibration, Performance modeling, Signal to noise ratio, Data processing, Stars, Data integration, Telescopes

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Proceedings Article | 9 July 2018 Paper

Paper

Planet formation imager: project update

John Monnier, Michael Ireland, Stefan Kraus, Almudena Alonso-Herrero, Amy Bonsor, Fabien Baron, Amelia Bayo, Jean-Philippe Berger, Tabetha Boyajian, Andrea Chiavassa, David Ciardi, Michelle Creech-Eakman, Willem-Jan de Wit, Denis Defrère, Ruobing Dong, Gaspard Duchêne, Catherine Espaillat, Alexandre Gallenne, Poshak Gandhi, Jean-Francois Gonzalez, Chris Haniff, Sebastian Hoenig, John Ilee, Andrea Isella, Eric Jensen, Attila Juhasz, Stephen Kane, Makoto Kishimoto, Wilhelm Kley, Quentin Kral, Kaitlin Kratter, Lucas Labadie, Sylvestre Lacour, Greg Laughlin, Jean-Baptiste Le Bouquin, Ernest Michael, Farzana Meru, Rafael Millan-Gabet, Florentin Millour, Stefano Minardi, Alessandro Morbidelli, Chris Mordasini, Andreas Morlok, Dave Mozurkewich, Richard Nelson, Johan Olofsson, Rene Oudmaijer, Chris Packham, Claudia Paladini, Olja Panic, Romain Petrov, Benjamin Pope, Joerg-Uwe Pott, Luis Henry Quiroga-Nunez, Cristina Ramos Almeida, Sean Raymond, Zsolt Regaly, Mark Reynolds, Stephen Ridgway, Stephen Rinehart, Matthias Schreiber, Michael Smith, Keivan Stassun, Jean Surdej, Theo ten Brummelaar, Konrad Tristram, Neal Turner, Peter Tuthill, Gerard van Belle, Gautum Vasisht, Alexander Wallace, Gerd Weigelt, Edward Wishnow, Markus Wittkowski, Sebastian Wolf, John Young, Ming Zhao, Zhaohuan Zhu, Sebastian Zúñiga-Fernández

Proceedings Volume 10701, 1070118 (2018) https://doi.org/10.1117/12.2312683

KEYWORDS: Planets, Telescopes, Space telescopes, Exoplanets, Stars, Mid-IR, Interferometry, Signal to noise ratio, Interferometers, Heterodyning

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Proceedings Article | 9 July 2018 Presentation + Paper

Presentation + Paper

Many interesting things are afoot at the Navy Precision Optical Interferometer

G. van Belle, J. Armstrong, J. Benson, E. Baines, R. Bevilacqua, T. Buschmann, J. Clark, W. DeGroff, J. Hall, R. Hindsley, A. Jorgensen, A. Lindgren, D. Mozurkewich, M. Muterspaugh, S. Pooler, S. Restaino, H. Schmitt, P. Shankland, R. Zavala

Proceedings Volume 10701, 1070105 (2018) https://doi.org/10.1117/12.2314204

KEYWORDS: Telescopes, Interferometers, Mirrors, Electron multiplying charge coupled devices, Observatories, Avalanche photodetectors, Precision optics, Interferometry, Beam splitters

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Proceedings Article | 4 August 2016 Paper

Paper

Architecture design study and technology road map for the Planet Formation Imager (PFI)

John Monnier, Michael Ireland, Stefan Kraus, Fabien Baron, Michelle Creech-Eakman, Ruobing Dong, Andrea Isella, Antoine Merand, Ernest Michael, Stefano Minardi, David Mozurkewich, Romain Petrov, Stephen Rinehart, Theo ten Brummelaar, Gautam Vasisht, Ed Wishnow, John Young, Zhaohuan Zhu

Proceedings Volume 9907, 99071O (2016) https://doi.org/10.1117/12.2233311

KEYWORDS: Telescopes, Planets, Imaging systems, Mid-IR, Heterodyning, Stars, Signal to noise ratio, Image restoration, L band, Visibility

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The Planet Formation Imager (PFI) Project has formed a Technical Working Group (TWG) to explore possible facility architectures to meet the primary PFI science goal of imaging planet formation in situ in nearby starforming regions. The goals of being sensitive to dust emission on solar system scales and resolving the Hill-sphere around forming giant planets can best be accomplished through sub-milliarcsecond imaging in the thermal infrared. Exploiting the 8-13 micron atmospheric window, a ground-based long-baseline interferometer with approximately 20 apertures including 10km baselines will have the necessary resolution to image structure down 0.1 milliarcseconds (0.014 AU) for T Tauri disks in Taurus. Even with large telescopes, this array will not have the sensitivity to directly track fringes in the mid-infrared for our prime targets and a fringe tracking system will be necessary in the near-infrared. While a heterodyne architecture using modern mid-IR laser comb technology remains a competitive option (especially for the intriguing 24 and 40μm atmospheric windows), the prioritization of 3-5μm observations of CO/H2O vibrotational levels by the PFI-Science Working Group (SWG) pushes the TWG to require vacuum pipe beam transport with potentially cooled optics. We present here a preliminary study of simulated L- and N-band PFI observations of a realistic 4-planet disk simulation, finding 21x2.5m PFI can easily detect the accreting protoplanets in both L and N-band but can see non-accreting planets only in L band. We also find that even an ambitious PFI will lack sufficient surface brightness sensitivity to image details of the fainter emission from dust structures beyond 5 AU, unless directly illuminated or heated by local energy sources. That said, the utility of PFI at N-band is highly dependent on the stage of planet formation in the disk and we require additional systematic studies in conjunction with the PFI-SWG to better understand the science capabilities of PFI, including the potential to resolve protoplanetary disks in emission lines to measure planet masses using position-velocity diagrams. We advocate for a specific technology road map in order to reduce the current cost driver (telescopes) and to validate high accuracy fringe tracking and high dynamic range imaging at L, M band. In conclusion, no technology show-stoppers have been identified for PFI to date, however there is high potential for breakthroughs in medium-aperture (4-m class) telescopes architecture that could reduce the cost of PFI by a factor of 2 or more.

Proceedings Article | 4 August 2016 Paper

Paper

Status of the Planet Formation Imager (PFI) concept

Michael Ireland, John Monnier, Stefan Kraus, Andrea Isella, Stefano Minardi, Romain Petrov, Theo ten Brummelaar, John Young, Gautam Vasisht, David Mozurkewich, Stephen Rinehart, Ernest Michael, Gerard van Belle, Julien Woillez

Proceedings Volume 9907, 99071L (2016) https://doi.org/10.1117/12.2233926

KEYWORDS: Planets, Imaging systems, Telescopes, Signal to noise ratio, Heterodyning, Optical instrument design, Space telescopes, Stars, Optical spheres, Adaptive optics

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Proceedings Article | 4 August 2016 Paper

Paper

Multi-baseline chain bootstrapping with new classic at the NPOI

A. Jorgensen, D. Mozurkewich, J. T. Armstrong, H. Schmitt, E. Baines, G. van Belle

Proceedings Volume 9907, 99072C (2016) https://doi.org/10.1117/12.2234389

KEYWORDS: Interferometers, Precision optics, Visibility, Spectrographs, Stars, Telescopes, Signal to noise ratio, Spatial frequencies, Analytical research, Observatories

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Proceedings Article | 4 August 2016 Paper

Paper

Practical beam transport for PFI

David Mozurkewich, John Young, Michael Ireland

Proceedings Volume 9907, 99073X (2016) https://doi.org/10.1117/12.2232382

KEYWORDS: Image processing, Telescopes, Relays, Planets, Planets, Mirrors, Lenses, Signal attenuation, Mid-IR, Wave propagation, Interferometry

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Proceedings Article | 4 August 2016 Paper

Paper

The new classic instrument for the navy precision optical interferometer

A. Jorgensen, H. Schmitt, J. T. Armstrong, E. Baines, R. Hindsley, D. Mozurkewich, G. van Belle

Proceedings Volume 9907, 990725 (2016) https://doi.org/10.1117/12.2232682

KEYWORDS: Precision optics, Interferometers, Computing systems, Electronics, Human-machine interfaces, Signal to noise ratio, Telescopes, Ultraviolet radiation, Stars, Spectrographs

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Proceedings Article | 4 August 2016 Paper

Paper

The path to interferometry in space

S. Rinehart, G. Savini, W. Holland, O. Absil, D. Defrère, L. Spencer, D. Leisawitz, M. Rizzo, R. Juanola-Paramon, D. Mozurkewich

Proceedings Volume 9907, 99070S (2016) https://doi.org/10.1117/12.2231754

KEYWORDS: Telescopes, Far infrared, Interferometry, Space telescopes, Interferometers, Exoplanets, Planets, Spatial resolution, Stars, Astrophysics

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Proceedings Article | 24 July 2014 Paper

Paper

Design and implementation of the NPOI database and website

K. Newman, A. Jorgensen, M. Landavazo, B. Sun, D. Hutter, J. Armstrong, David Mozurkewich, N. Elias, G. van Belle, H. Schmitt, E. Baines

Proceedings Volume 9146, 914630 (2014) https://doi.org/10.1117/12.2057186

KEYWORDS: Databases, Stars, Interfaces, Precision optics, Interferometers, Binary data, Observatories, Analytical research, Astronomical imaging, Astronomy

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Proceedings Article | 24 July 2014 Paper

Paper

Photometric calibration of NPOI visibilities

Henrique Schmitt, David Mozurkewich, J. Thomas Armstrong, Anders Jorgensen, Ellyn Baines

Proceedings Volume 9146, 91462Q (2014) https://doi.org/10.1117/12.2057197

KEYWORDS: Calibration, Visibility, Telescopes, Stars, Interferometers, Beam splitters, Precision optics, Interferometry, Spectrographs, Solids

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Proceedings Article | 24 July 2014 Paper

Paper

6-station, 5-baseline fringe tracking with the new classic data acquisition system at the Navy Precision Optical Interferometer

M. Landavazo, A. Jorgensen, B. Sun, K. Newman, David Mozurkewich, G. van Belle, Donald Hutter, H. Schmitt, J. Armstrong, E. Baines, S. Restaino

Proceedings Volume 9146, 914621 (2014) https://doi.org/10.1117/12.2057278

KEYWORDS: Signal to noise ratio, Data acquisition, Interferometers, Precision optics, Spectrographs, Detection and tracking algorithms, Optical tracking, Image resolution, Imaging systems, Stars

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The Navy Precision Optical Interferometer (NPOI) has a station layout which makes it uniquely suited for imaging. Stellar surface imaging requires a variety of baseline lengths and in particular long baselines with resolution much smaller than the diameter of the target star. Because the fringe signal-to-noise ratio (SNR) is generally low on such long baselines, fringe-tracking cannot be carried out on those baselines directly. Instead, baseline bootstrapping must be employed in which the long baseline is composed of a number of connected shorter baselines. When fringes are tracked on all the shorter baselines fringes are also present on the long baseline. For compact sources, such as stellar disks, the shorter baselines generally have higher SNR and making them short enough that the source is unresolved by them is ideal. Thus, the resolution, or number of pixels across a stellar disk, is roughly equal to the ratio of the length of the long baseline to the length of the short baselines. The more bootstrapped baselines, the better the images produced. If there is also a wide wavelength coverage, wavelength bootstrapping can also be used under some circumstances to increase the resolution further. The NPOI is unique in that it allows 6-station, 5-baseline bootstrapping, the most of any currently operating interferometer. Furthermore, the NPOI Classic beam combiner has wavelength coverage from 450 nm to 850 nm. However, until now, this capability has not been fully exploited. The stellar surface imaging project which was recently funded by the National Science Foundation is exploiting this capability. The New Classic data acquisition system, reported separately, is the hardware which delivers the data to the fringe-tracking algorithm. In this paper we report on the development of the fringe-tracking capability with the New Classic data acquisition system. We discuss the design of the fringe tracking algorithm and present performance results from simulations and on sky observation.

Proceedings Article | 24 July 2014 Paper

Paper

Progress toward unprecedented imaging of stellar surfaces with the Navy precision optical interferometer

A. Jorgensen, D. Mozurkewich, H. Schmitt, G. van Belle, D. Hutter, J. Clark, J. Armstrong, E. Baines, K. Newman, M. Landavazo, B. Sun, S. Restaino

Proceedings Volume 9146, 91460A (2014) https://doi.org/10.1117/12.2055789

KEYWORDS: Visibility, Stars, Telescopes, Interferometers, Data acquisition, Image resolution, Signal to noise ratio, Spectrographs, Precision optics, Imaging arrays

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We present progress on the stellar surface imaging project recently funded by the U. S. National Science Foun- dation. With the unique layout of the Navy Precision Optical Interferometer (NPOI) in combination with data acquisition and fringe-tracking upgrades we expect to be able to substantially exceed the imaging fidelity and resolution of any other interferometer in operation. The project combines several existing advances and infras- tructure at NPOI with modest enhancements. For optimal imaging there are several requirements that should be fulfilled. The observatory should be capable of measuring visibilities on a wide range of baseline lengths and orientations, providing complete Fourier (UV) coverage in a short period of time. It should measure visibility amplitudes with good SNR on all baselines as critical imaging information is often contained in low-amplitude visibilities. It should measure the visibility phase on all baselines. The technologies which can achieve this are the NPOI Y-shaped array with (nearly) equal spacing between telescopes and an ability for rapid configuration. Placing 6-telescopes in a row makes it possible to measure visibilities into the 4th lobe of the visibility function. By arranging the 12 available telescopes carefully we can switch, every few days, between 6 different 6-station chains which provide symmetric coverage in the Fourier plane without moving any telescopes, only by moving beam relay mirrors. The 6-station chains are important to achieve the highest imaging resolution, and switching rapidly between station chains provides uniform coverage. Coherent integration techniques can be used to obtain good SNR on very small visibilities. Coherently integrated visibilities can be used for imaging with standard radio imaging packages such as AIPS. The commissioning of one additional station, the use of new data acqui- sition hardware and fringe tracking algorithms are the enhancements which are making this project a reality. The New Classic data acquisition system, based on a powerful Stratix FPGA and fast Direct Memory Access module, upgrades the existing Classic beam combiner to allow for continuous data recording across all baselines available with 6 telescopes. It also provides the computing power and software environment necessary for im- plementing the 6-station, 5-baseline fringe-tracking algorithms. In separate papers we discuss the New Classic data acquisition system and the fringe-tracking algorithms in greater detail. In this paper we will focus on an overview of the project. We will describe the observation planning, logistics of the observations, and discuss the current status of the project including preliminary results and simulations of expected future results.

Proceedings Article | 24 July 2014 Paper

Paper

The new classic data acquisition system for NPOI

B. Sun, A. Jorgensen, M. Landavazo, D. Hutter, G. van Belle, David Mozurkewich, J. Armstrong, H. Schmitt, E. Baines, S. Restaino

Proceedings Volume 9146, 914620 (2014) https://doi.org/10.1117/12.2057013

KEYWORDS: Data acquisition, Field programmable gate arrays, Photons, Imaging systems, Spectrographs, Computing systems, Observatories, Clocks, Detection and tracking algorithms, Analytical research

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Proceedings Article | 24 July 2014 Paper

Paper

Multi-baseline bootstrapping at the Navy precision optical interferometer

J. Armstrong, H. Schmitt, D. Mozurkewich, A. Jorgensen, M. Muterspaugh, E. Baines, J. Benson, Robert Zavala, D. Hutter

Proceedings Volume 9146, 91460K (2014) https://doi.org/10.1117/12.2055209

KEYWORDS: Signal to noise ratio, Stars, Precision optics, Interferometers, Observatories, Chemical elements, Ocean optics, Interferometry, Sensors, Electronics

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Proceedings Article | 12 September 2012 Paper

Paper

Simulated imaging with an interferometer on a boom

Henrique Schmitt, David Mozurkewich, J. Thomas Armstrong, Anders Jorgensen, Ellyn Baines, Sergio Restaino, Robert Hindsley, Gerard van Belle

Proceedings Volume 8445, 84452P (2012) https://doi.org/10.1117/12.926707

KEYWORDS: Telescopes, Asteroids, Interferometers, Interferometry, Stars, Optical fibers, Device simulation, Satellite imaging, Satellites, Image resolution

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Proceedings Article | 12 September 2012 Paper

Paper

Calibration of coherently integrated visibilities

T. Hall, A. Jorgensen, D. Mozurkewich, J. Armstrong, H. Schmitt, E. Baines, D. Hutter

Proceedings Volume 8445, 84453G (2012) https://doi.org/10.1117/12.925818

KEYWORDS: Visibility, Signal to noise ratio, Photons, Solids, Calibration, Analytical research, Precision optics, Interferometers, Interference (communication), Integrated optics

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Proceedings Article | 12 September 2012 Paper

Paper

Navy precision optical interferometer database

K. Ryan, A. Jorgensen, T. Hall, J. Armstrong, D. Hutter, D. Mozurkewich

Proceedings Volume 8445, 84453H (2012) https://doi.org/10.1117/12.925940

KEYWORDS: Databases, Spectrographs, Stars, Precision optics, Interferometers, Ocean optics, Astronomical imaging, Mining, Analytical research, Binary data

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Proceedings Article | 12 September 2012 Paper

Paper

Precise stellar diameters from coherently averaged visibilities

J. T. Armstrong, A. Jorgensen, H. Neilson, D. Mozurkewich, E. Baines, H. Schmitt

Proceedings Volume 8445, 84453K (2012) https://doi.org/10.1117/12.926508

KEYWORDS: Data modeling, Atmospheric modeling, Visibility, Spatial frequencies, Stars, Visual process modeling, Optical interferometry, Spherical lenses, Signal to noise ratio, Interferometry

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Proceedings Article | 12 September 2012 Paper

Paper

Calibration and imaging algorithms for full-Stokes optical interferometry

Nicholas Elias, David Mozurkewich, Luke Schmidt, Colby Jurgenson, Stanislav Edel, Carol Jones, Robert Halonen, Henrique Schmitt, Anders Jorgensen, Donald Hutter

Proceedings Volume 8445, 84451X (2012) https://doi.org/10.1117/12.925781

KEYWORDS: Polarization, Polarimetry, Calibration, Interferometers, Stars, Interferometry, Optical interferometry, Data acquisition, Visibility, Atmospheric modeling

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Proceedings Article | 12 September 2012 Paper

Paper

Interferometric imaging of geostationary satellites: signal-to-noise considerations

A. Jorgensen, H. Schmitt, D. Mozurkewich, J. Armstrong, S. Restaino, R. Hindsley

Proceedings Volume 8445, 84452M (2012) https://doi.org/10.1117/12.925953

KEYWORDS: Satellites, Interferometers, Telescopes, Satellite imaging, Signal to noise ratio, Interferometry, Astronomy, Image resolution, Astronomical telescopes, Photons

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Proceedings Article | 12 September 2012 Paper

Paper

Full stokes beam combination for optical interferometry

D. Mozurkewich, N. Elias, A. Jorgensen, H. Schmitt, D. Hutter

Proceedings Volume 8445, 84452A (2012) https://doi.org/10.1117/12.926660

KEYWORDS: Polarization, Calibration, Wave plates, Telescopes, Beam splitters, Interferometers, Polarimetry, Sensors, Interferometry, Visibility

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Proceedings Article | 12 September 2012 Paper

Paper

Coherent integration in optical interferometry

A. Jorgensen, H. Schmitt, G. van Belle, D. Mozurkewich, D. Hutter, J. T. Armstrong, E. Baines, S. Restaino, T. Hall

Proceedings Volume 8445, 844519 (2012) https://doi.org/10.1117/12.925898

KEYWORDS: Signal to noise ratio, Visibility, Photons, Coherence imaging, Optical interferometry, Phase measurement, Calibration, Interferometers, Telescopes, Stars

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Proceedings Article | 25 May 2012 Paper

Paper

Interferometric imaging of geostationary satellites

J. T. Armstrong, E. Baines, R. Hindsley, H. Schmitt, S. Restaino, A. Jorgensen, D. Mozurkewich

Proceedings Volume 8385, 83850D (2012) https://doi.org/10.1117/12.919381

KEYWORDS: Telescopes, Interferometry, Satellites, Interferometers, Satellite imaging, Visibility, Spatial frequencies, Space telescopes, Optical interferometry, Fourier transforms

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Proceedings Article | 15 September 2011 Paper

Paper

On improving the performance of an adaptive optics system

D. Mozurkewich

Proceedings Volume 8146, 81460K (2011) https://doi.org/10.1117/12.895246

KEYWORDS: Adaptive optics, Spatial frequencies, Calibration, Data modeling, Wavefronts, Sensors, Visibility, Fringe analysis, Cameras, Telescopes

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Proceedings Article | 14 September 2011 Paper

Paper

Simulated optical interferometric observations of geostationary satellites

Henrique Schmitt, David Mozurkewich, Sergio Restaino, J. Thomas Armstrong, Ellyn Baines, Robert Hindsley, Anders Jorgensen

Proceedings Volume 8165, 81650T (2011) https://doi.org/10.1117/12.893863

KEYWORDS: Telescopes, Satellites, Space telescopes, Satellite imaging, Earth observing sensors, Interferometry, Interferometers, Optical simulations, Image resolution, Optical arrays

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Proceedings Article | 14 September 2011 Paper

Paper

An imaging interferometer for compact sources

D. Mozurkewich, J. T. Armstrong, R. Hindsley, A Jorgensen, S. Restaino, H. Schmitt

Proceedings Volume 8165, 81650X (2011) https://doi.org/10.1117/12.893476

KEYWORDS: Interferometers, Satellites, Telescopes, Optical fibers, Wavefront sensors, Signal to noise ratio, Space telescopes, Sensors, Interferometry, Imaging systems

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Proceedings Article | 14 September 2011 Paper

Paper

Comparing the sensitivities of intensity interferometry and Michelson interferometry

J. T. Armstrong, D. Mozurkewich, H. Schmitt, S. Restaino, R. Hindsley

Proceedings Volume 8165, 81650Z (2011) https://doi.org/10.1117/12.894039

KEYWORDS: Interferometry, Telescopes, Signal to noise ratio, Interferometers, Photons, Sensors, Visibility, Artificial intelligence, Precision optics, Michelson interferometers

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Proceedings Article | 1 November 2010 Paper

Paper

Adaptive optics for the CHARA array II

Stephen Ridgway, Theo ten Brummelaar, Judit Sturmann, Laszlo Sturmann, Nils Turner, Harold McAlister, John Monnier, Michael Ireland, Peter Tuthill, Derek Coburn, Chris Dainty, Nicholas Devaney, Alexander Goncharov, David Mozurkewich

Proceedings Volume 7734, 77340B (2010) https://doi.org/10.1117/12.857685

KEYWORDS: Adaptive optics, Telescopes, Atmospheric optics, Wavefronts, Visibility, Interferometry, Space telescopes, Atmospheric propagation, Monte Carlo methods, Astronomy

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Proceedings Article | 22 July 2010 Paper

Paper

Beam combination with a large number of apertures

D. Mozurkewich, Aboubakar Traore

Proceedings Volume 7734, 773443 (2010) https://doi.org/10.1117/12.856558

KEYWORDS: Sensors, Fringe analysis, Calibration, Data modeling, Space telescopes, Telescopes, Phase measurement, Interferometers, Mirrors, Point spread functions

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Proceedings Article | 22 July 2010 Paper

Paper

Coherent integration results from the NPOI

A. Jorgensen, H. Schmitt, J. Armstrong, D. Mozurkewich, E. Baines, R. Hindsley, D. Hutter, S. Restaino

Proceedings Volume 7734, 77342Q (2010) https://doi.org/10.1117/12.858298

KEYWORDS: Visibility, Signal to noise ratio, Stars, Solids, Phase measurement, Spectrographs, Calibration, Spectral resolution, Data modeling, Precision measurement

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Proceedings Article | 22 July 2010 Paper

Paper

Coherent integration: to real time or not to real time? That is the question.

Anders Jorgensen, Dave Mozurkewich

Proceedings Volume 7734, 773426 (2010) https://doi.org/10.1117/12.858277

KEYWORDS: Signal to noise ratio, Sensors, Visibility, Filtering (signal processing), Solids, Quantum efficiency, Interferometry, Electronic filtering, Infrared radiation, Interferometers

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Proceedings Article | 27 August 2009 Paper

Paper

Stellar imager (SI): enhancements to the mission enabled by the constellation architecture (Ares I/Ares V)

Kenneth Carpenter, Margarita Karovska, Richard Lyon, D. Mozurkewich, Carolus Schrijver

Proceedings Volume 7436, 74360A (2009) https://doi.org/10.1117/12.825393

KEYWORDS: Mirrors, Imaging systems, Magnetism, Space operations, Spatial resolution, Image resolution, Imaging spectroscopy, Astrophysics, Stars, Robots

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Proceedings Article | 28 July 2008 Paper

Paper

Practical coherent integration with the NPOI

Anders Jorgensen, Dave Mozurkewich, Henrique Schmitt, Robert Hindsley, J. Thomas Armstrong, Thomas Pauls, D. Hutter

Proceedings Volume 7013, 70131E (2008) https://doi.org/10.1117/12.790305

KEYWORDS: Visibility, Stars, Calibration, Phase measurement, Signal to noise ratio, Atmospheric modeling, Sensors, Photons, Solids, Interferometers

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Proceedings Article | 28 July 2008 Paper

Paper

Beam combination with a large number of apertures

D. Mozurkewich

Proceedings Volume 7013, 70132D (2008) https://doi.org/10.1117/12.788328

KEYWORDS: Adaptive optics, Telescopes, Interferometers, Interferometry, Sensors, Space telescopes, Calibration, Signal to noise ratio, Optical design, Spatial frequencies

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Proceedings Article | 28 July 2008 Paper

Paper

Measurements of binary stars with coherent integration of NPOI data

Anders Jorgensen, H. Schmitt, R. Hindsley, J. T. Armstrong, T. Pauls, D. Mozurkewich, D. Hutter, C. Tycner

Proceedings Volume 7013, 701342 (2008) https://doi.org/10.1117/12.790290

KEYWORDS: Stars, Visibility, Calibration, Binary data, Phase measurement, Data modeling, Solids, Data integration, Interferometers, Spectrographs

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Proceedings Article | 28 July 2008 Paper

Paper

Solving the imaging problem with coherently integrated multiwavelength data

H. Schmitt, T. Pauls, J. T. Armstrong, D. Mozurkewich, A. Jorgensen, R. Hindsley, C. Tycner, R. Zavala, J. Benson, D. Hutter

Proceedings Volume 7013, 70131H (2008) https://doi.org/10.1117/12.789487

KEYWORDS: Stars, Visibility, Calibration, Coherence imaging, Radio optics, Data integration, Interferometry, Radio interferometry, Observatories, Integrated optics

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Proceedings Article | 15 July 2008 Paper

Paper

Stellar Imager: wavefront control

Richard Lyon, Kenneth Carpenter, Peter Petrone, Peter Dogoda, Daniel Reed, David Mozurkewich

Proceedings Volume 7011, 701131 (2008) https://doi.org/10.1117/12.789758

KEYWORDS: Mirrors, Wavefronts, Imaging systems, Actuators, Wavefront sensors, Control systems, Spherical lenses, Interferometry, Modulation transfer functions, Off axis mirrors

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Proceedings Article | 21 September 2007 Paper

Paper

Wavefront sensing and closed-loop control for the Fizeau interferometry testbed

Richard Lyon, Kenneth Carpenter, Alice Liu, Peter Petrone, Peter Dogoda, Daniel Reed, David Mozurkewich

Proceedings Volume 6687, 66870H (2007) https://doi.org/10.1117/12.731761

KEYWORDS: Mirrors, Wavefronts, Imaging systems, Actuators, Wavefront sensors, Interferometry, Control systems, Spherical lenses, Modulation transfer functions, Optical transfer functions

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Proceedings Article | 20 September 2007 Paper

Paper

Beam combination for Stellar Imager and its application to full-aperture imaging

D. Mozurkewich, K. Carpenter, R. Lyon

Proceedings Volume 6687, 66870K (2007) https://doi.org/10.1117/12.732833

KEYWORDS: Imaging systems, Sensors, Telescopes, Spatial frequencies, Mirrors, Space telescopes, Interferometry, Adaptive optics, Wavefronts, Signal to noise ratio

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Proceedings Article | 20 September 2007 Paper

Paper

Direct UV/optical imaging of stellar surfaces: the Stellar Imager Vision Mission

Kenneth Carpenter, Richard Lyon, Carolus Schrijver, Margarita Karovska, David Mozurkewich

Proceedings Volume 6687, 66870G (2007) https://doi.org/10.1117/12.732440

KEYWORDS: Stars, Imaging systems, Magnetism, Mirrors, Space operations, Sun, Planets, Image resolution, Ultraviolet radiation, Observatories

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Proceedings Article | 9 February 2007 Paper

Paper

MEMS based adaptive optics systems at the Naval Research Laboratory: an update

Sergio Restaino, Jonathan Andrews, J. Armstrong, Ty Martinez, Dave Mozurkewich, Don Payne, Christopher Wilcox

Proceedings Volume 6467, 646709 (2007) https://doi.org/10.1117/12.702851

KEYWORDS: Adaptive optics, Microelectromechanical systems, Point spread functions, Analytical research, Interferometers, Wavefronts, Wavefront sensors, LCDs, Space telescopes

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Proceedings Article | 29 June 2006 Paper

Paper

Characterization of the optical throughput performance of the Navy Prototype Optical Interferometer (NPOI)

Xiaolei Zhang, J. Thomas Armstrong, James Clark, G. Charmaine Gilbreath, Robert Lucke, Sergio Restaino, David Mozurkewich, James Benson, Donald Hutter, Nat White, Henrique Schmitt, Joshua Walton

Proceedings Volume 6268, 62683V (2006) https://doi.org/10.1117/12.670001

KEYWORDS: Mirrors, Spectroscopy, Interferometers, Ocean optics, Beam splitters, Geometrical optics, Sensors, Charge-coupled devices, Prototyping, CCD cameras

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Proceedings Article | 29 June 2006 Paper

Paper

Characterization of the NPOI fringe scanning stroke

Anders Jorgensen, Dave Mozurkewich, James Murphy, Marc Sapantaie, J. Thomas Armstrong, G. Charmaine Gilbreath, Robert Hindsley, Thomas Pauls, Henrique Schmitt, Donald Hutter

Proceedings Volume 6268, 62684A (2006) https://doi.org/10.1117/12.672839

KEYWORDS: Metrology, Visibility, Heterodyning, Solids, Interferometers, Laser metrology, Spectrographs, Bragg cells, Polarization, Data acquisition

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We report on the results of an experiment to characterize the fringe scanning stroke on the Navy Prototype Optical Interferometer (NPOI) Fast Delay Line (FDL) strokes. The measurements were carried out during three days April 11-13, 2005 at the NPOI site near Flagstaff, AZ. The NPOI uses a heterodyne metrology laser system in its operations. It consists of a HeNe laser with a 2 MHz heterodyne component generated by an Acousto-Optic Modulator (AOM). One polarization is used as the 2 MHz clock, and the other is sent through the feed system twice and bounces off the piezo stroke modulators. We sampled both signals at 50 MHz, and obtained stroke and cart combined motion at the frequency of the stroke modulated 2 MHz heterodyne signal. By counting zero-crossings in the reference and feed system signals, a rough position (to a wavelength) can be obtained. This can be further refined to the few-nanometer level by measuring the relative phases of the reference and feed system signals. This results in approximately 4000 positions measurements per 2 ms stroke with a precision of approximately 1 nm. We recorded stroke positions for approximately 500 strokes (1 s), for all but one of the six FDLs, under a variety of conditions: different stroke amplitudes, different cart speeds, and different cart positions in the FDLs. We then analyzed these data from a total of 100 tests to understand the deviation of the actual stroke from the ideal stroke. We found that the mean stroke differs from the ideal stroke, and that consecutive strokes differ from each other. We computed the effect of the non-ideal stroke on the science data. A non-ideal stroke results in leakage of fringe power between fringe frequencies. This leakage is not significant during most normal operations of the NPOI. However, when the squared visibilities of baselines on the same spectrograph differ by large amounts (a factor of 10), care should be taken. Ideally, High- and low-visibility baselines should be placed on different spectrographs.

Proceedings Article | 28 June 2006 Paper

Paper

Thermal and deadtime effects in APD pulse detectors: a unified model

D. Peterson, D. Mozurkewich, C. Hummel

Proceedings Volume 6268, 62681O (2006) https://doi.org/10.1117/12.672094

KEYWORDS: Sensors, Avalanche photodetectors, Light emitting diodes, Thermal modeling, Diodes, Thermal effects, Quantum efficiency, Data modeling, Signal detection, Electrons

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Proceedings Article | 28 June 2006 Paper

Paper

Using differential phases in optical interferometry

Henrique Schmitt, Thomas Pauls, Christopher Tycner, J. Thomas Armstrong, James Benson, James Clark, Robert Hindsley, Donald Hutter, Deane Peterson, Anders Jorgensen, David Mozurkewich, G. Charmaine Gilbreath, Robert Zavala

Proceedings Volume 6268, 62683B (2006) https://doi.org/10.1117/12.672396

KEYWORDS: Stars, Calibration, Phase interferometry, Optical interferometry, Observatories, Beryllium, Interferometers, Analytical research, Prototyping, Phase measurement

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Proceedings Article | 27 June 2006 Paper

Paper

Coherent integrations, fringe modeling, and bootstrapping with the NPOI

Anders Jorgensen, Dave Mozurkewich, Henrique Schmitt, J. Thomas Armstrong, G. Charmaine Gilbreath, Robert Hindsley, Thomas Pauls, Deane Peterson

Proceedings Volume 6268, 62681H (2006) https://doi.org/10.1117/12.672829

KEYWORDS: Signal to noise ratio, Visibility, Atmospheric modeling, Calibration, Phase measurement, Solids, Stars, Instrument modeling, Data modeling, Interferometers

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Atmospheric turbulence is a major impediment to ground-based optical interferometry. It causes fringes to move on ms time-scales, forcing very short exposures. Because of the semi-random phase shifts, the traditional approach averages exposure power spectra to build signal-to-noise ratio (SNR). This incoherent average has two problems: (1) A bias of correlated noise is introduced which must be subtracted. The smaller the visibility/the fainter the target star, the more diffcult bias subtraction becomes. SNR builds only slowly in this case. Unfortunately, these most difficult small visibility baselines contain most of the image information. (2) Baseline phase information is discarded. These are serious challenges to imaging with ground based optical interferometers. But if we were able to determine fringe phase, we could shift and integrate all the short exposures. We would then eliminate the bias problem, improve the SNR, and we would have preserved most of the phase information. This coherent averaging becomes possible with multi-spectral measurements. The group delay presents one option for determining phase. A more accurate approach is to use a time-dependent model of the fringe. For the most interesting low-visibility baselines, the atmospheric phase information can be bootstrapped from phase determinations on high-visibility baselines using the closure relation. The NPOI, with 32 spectral channels and a bootstrapping configuration, is well-suited for these approaches. We will illustrate how the fringe modeling approach works, compare it to the group-delay approach, and show how these approaches can be used to derive bias-free visibility amplitude and phase information. Coherent integration provides the highest signal-to-noise (SNR) improvement precisely in the situations where SNR builds most slowly using incoherent averaging. Coherent integration also produces high-SNR phase measurements which are calibration-free and thus have high real uncertainties as well. In this paper we will show how to coherently integration on NPOI data, and how to use baseline visibilities and calibrate coherently integrated visibility amplitudes.

Proceedings Article | 20 October 2004 Paper

Paper

Fringe fitting for coherent integrations with the NPOI

Anders Jorgensen, David Mozurkewich, J. Armstrong, Robert Hindsley, Thomas Pauls, G. Gilbreath, Sergio Restaino

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.552279

KEYWORDS: Visibility, Calibration, Stars, Data modeling, Solids, Fringe analysis, Signal to noise ratio, Fourier transforms, Optical interferometry, Error analysis

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Proceedings Article | 20 October 2004 Paper

Paper

Adaptive optics performance model for optical interferometry

David Mozurkewich, Sergio Restaino, G. Gilbreath

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.552361

KEYWORDS: Adaptive optics, Wavefronts, Interferometers, Signal to noise ratio, Performance modeling, Stars, Interferometry, Optical interferometry, Servomechanisms, Visibility

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Proceedings Article | 20 October 2004 Paper

Paper

Coherent integration of NPOI phase closure data on Altair

Christian Hummel, David Mozurkewich, James Benson, Deane Peterson

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.550806

KEYWORDS: Data modeling, Calibration, Visibility, Stars, Interferometers, Data integration, Signal to noise ratio, Spectrometers, Observatories, Phase measurement

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Proceedings Article | 20 October 2004 Paper

Paper

Estimation of fringe parameters

David Mozurkewich, J. Armstrong, G. Gilbreath, Thomas Pauls

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.552416

KEYWORDS: Data modeling, Sensors, Visibility, Stars, Interferometers, Coastal modeling, Solids, Signal to noise ratio, Calibration, Sensor performance

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Proceedings Article | 20 October 2004 Paper

Paper

H-alpha observations using closure phases at the NPOI

G. Gilbreath, Thomas Pauls, J. Armstrong, David Mozurkewich, James Clark, Robert Hindsley, Donald Hutter

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.555221

KEYWORDS: Stars, Beryllium, Calibration, Platinum, Ultraviolet radiation, Phase measurement, Interferometers, Optical filters, Visibility, Prototyping

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Proceedings Article | 20 October 2004 Paper

Paper

Resolving the effects of rotation in early type stars

Deane Peterson, Christian Hummel, Thomas Pauls, J. Armstrong, James Benson, G. Gilbreath, Robert Hindsley, Donald Hutter, David Mozurkewich

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.552020

KEYWORDS: Stars, Atmospheric modeling, Solids, Data modeling, Phase measurement, Calibration, Observatories, Analytical research, Interferometers, Physics

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Proceedings Article | 20 October 2004 Paper

Paper

The Fizeau interferometer testbed (FIT): developing and testing the technologies needed for space-based interferometric imaging systems

Lisa Mazzuca, Kenneth Carpenter, Richard Lyon, Joe Marzouk, Peter Petrone, Paul Cottle, Peter Dogoda, Hubert Huet, Peter Liiva, David Mozurkewich, J. Armstrong, Xiaolei Zhang, Gregory Solyar, Lee Mundy

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.550450

KEYWORDS: Mirrors, Imaging systems, Actuators, Wavefronts, Interferometry, Control systems, Spherical lenses, Calibration, Fizeau interferometers, Sensors

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Proceedings Article | 20 October 2004 Paper

Paper

Precision narrow-angle astrometry of binary stars with the Navy Prototype Optical Interferometer

J. Armstrong, James Clark, G. Gilbreath, Robert Hindsley, Donald Hutter, David Mozurkewich, Thomas Pauls

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.553062

KEYWORDS: Stars, Planets, Interferometry, Binary data, Interferometers, Spectroscopy, Prototyping, Observatories, Optical interferometry, Visibility

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Proceedings Article | 20 October 2004 Paper

Paper

Developing a portable NRL fast-frame-rate seeing monitor

Eun Oh, James Murphy, Jeffrey Baker, G. Charmaine Gilbreath, Robert Hindsley, David Mozurkewich, Sergio Restaino, Susan Fortenberry

Proceedings Volume 5550, (2004) https://doi.org/10.1117/12.562195

KEYWORDS: Stars, Telescopes, Image intensifiers, Charge-coupled devices, Cameras, Image processing, Calibration, Data analysis, MATLAB, Lenses

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Proceedings Article | 12 October 2004 Paper

Paper

Fizeau interferometry testbed: wavefront control

Richard Lyon, Kenneth Carpenter, Lisa Mazzuca, Hubert Huet, Paul Cottle, Peter Petrone, Peter Dagoda, Peter Liiva, Joe Marzouk, Gregory Solyar, David Mozurkewich, Xiaolei Zhang, Thomas Armstrong

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.552198

KEYWORDS: Mirrors, Wavefronts, Actuators, Imaging systems, Wavefront sensors, Modulation transfer functions, Interferometry, Control systems, Phase retrieval, Spherical lenses

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SPIE Journal Paper | 1 September 2003

Analysis of the Naval Observatory Flagstaff Station 1-m telescope using annular Zernike polynomials

Sergio Restaino, Scott Teare, Michael DiVittorio, G. Gilbreath, David Mozurkewich

OE, Vol. 42, Issue 09, (September 2003) https://doi.org/10.1117/12.10.1117/1.1598210

KEYWORDS: Telescopes, Zernike polynomials, Wavefronts, Observatories, Monochromatic aberrations, Adaptive optics, Optical components, Error analysis, Analytical research, Optical aberrations

Proceedings Article | 24 February 2003 Paper

Paper

The Stellar Imager (SI) mission concept

Kenneth Carpenter, Carolus Schrijver, Richard Lyon, Lee Mundy, Ronald Allen, J. Thomas Armstrong, William Danchi, Margarita Karovska, Joseph Marzouk, Lisa Mazzuca, David Mozurkewich, Susan Neff, Thomas Pauls, Jayadev Rajagopal, Gregory Solyar, Xiaolei Zhang

Proceedings Volume 4854, (2003) https://doi.org/10.1117/12.459776

KEYWORDS: Stars, Magnetism, Imaging systems, Interferometers, Mirrors, Space telescopes, Interferometry, Planets, Image resolution, Ultraviolet radiation

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Proceedings Article | 21 February 2003 Paper

Paper

Simulating atmosphere phase screens for dilute arrays

Deane Peterson, David Mozurkewich

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.459764

KEYWORDS: Wavefronts, Computer simulations, Matrices, Algorithm development, Atmospheric optics, Chemical elements, Interferometry, Interferometers, Stars, Analytical research

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Proceedings Article | 21 February 2003 Paper

Paper

Determining the orientation of the rotation axis of a star using a spectral-line interferometer

David Westpfahl, David Mozurkewich, Charles Dudley

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.459936

KEYWORDS: Stars, Interferometers, Interferometry, Astronomical imaging, Astronomy, Spectral resolution

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Proceedings Article | 21 February 2003 Paper

Paper

Simulated multibeam observations of Be stars in the H-alpha line using the Navy prototype optical interferometer

G. Charmaine Gilbreath, Thomas Pauls, J. Thomas Armstrong, David Mozurkewich, James Benson, Robert Hindsley, Daniel Driscoll

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.459683

KEYWORDS: Beryllium, Stars, Interferometers, Image restoration, Prototyping, Optical filters, Data modeling, Point spread functions, Observatories, Image filtering

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Proceedings Article | 21 February 2003 Paper

Paper

Simultaneous 6-station observations with the NPOI

James Benson, Christian Hummel, David Mozurkewich

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.459322

KEYWORDS: Spectrometers, Stars, Visibility, Calibration, Photon counting, Sensors, Detection and tracking algorithms, Avalanche photodetectors, Interferometers, Electronics

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Proceedings Article | 21 February 2003 Paper

Paper

Results from a portable adaptive optics system on the 1-meter telescope at the Naval Observatory Flagstaff Station

Sergio Restaino, G. Charmaine Gilbreath, Don Payne, Jeffrey Baker, Ty Martinez, Michael DiVittorio, David Mozurkewich, Jeffrey Friedman

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.479725

KEYWORDS: Adaptive optics, Telescopes, Observatories, Analytical research, Cameras, Imaging systems, Interferometry, Calibration, Interferometers, Wavefront sensors

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Proceedings Article | 21 February 2003 Paper

Paper

Coherent integration using phase bootstrapping

Christian Hummel, David Mozurkewich, James Benson, Markus Wittkowski

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.459143

KEYWORDS: Visibility, Signal to noise ratio, Algorithm development, Atmospheric modeling, Observatories, Data integration, Detection and tracking algorithms, Data modeling, Interferometers, Stars

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Proceedings Article | 21 February 2003 Paper

Paper

NPOI: progress report

David Mozurkewich, James Benson, Donald Hutter

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.457028

KEYWORDS: Mirrors, Sensors, Stars, Calibration, Switches, Observatories, Light emitting diodes, Charge-coupled devices, Visibility, Prototyping

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Proceedings Article | 21 February 2003 Paper

Paper

A close look at raw data from the NPOI

J. Thomas Armstrong, David Mozurkewich

Proceedings Volume 4838, (2003) https://doi.org/10.1117/12.459385

KEYWORDS: Atmospheric modeling, Modulation, Stars, Prototyping, Interferometers, Visibility, Optical filters, Computer simulations, Analytical research, Spectrometers

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Proceedings Article | 18 December 2002 Paper

Paper

Enhancement of sparse aperture imaging through multiwavelength synthesis

Chris Rollins, Peter Nebolsine, Norman Humer, David Mozurkewich, Lee Rickard

Proceedings Volume 4849, (2002) https://doi.org/10.1117/12.460764

KEYWORDS: Spatial frequencies, Modulation transfer functions, Image processing, Signal to noise ratio, Image filtering, Electronic filtering, Imaging systems, Optical filters, Telescopes, Algorithm development

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Proceedings Article | 2 January 2002 Paper

Paper

Operational experience with the Navy Prototype Optical Interferometer (NPOI)

Nathaniel White, David Mozurkewich, Donald Hutter, James Benson, Christian Hummel, James Clark

Proceedings Volume 4844, (2002) https://doi.org/10.1117/12.460763

KEYWORDS: Interferometers, Mirrors, Prototyping, Optical alignment, Stars, Telescopes, Electronics, Observatories, Control systems, Optical tracking

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Proceedings Article | 5 July 2000 Paper

Paper

Estimating errors in stellar angular diameters: does the NPOI see the pulsation of delta Cephei?

J. Thomas Armstrong, Robert Hindsley, David Mozurkewich, Arsen Hajian, Marvin Germain, Tyler Nordgren

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390263

KEYWORDS: Calibration, Stars, Error analysis, Interferometers, Visibility, Photometry, Observatories, Interferometry, Distance measurement, Atmospheric corrections

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Proceedings Article | 5 July 2000 Paper

Paper

Large-aperture quad cell for fiducial alignment with large-diameter beams

G. Charmaine Gilbreath, David Mozurkewich

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390195

KEYWORDS: Optical alignment, Data acquisition, Solar cells, Interferometers, Interferometry, Aerospace engineering, Analog electronics, Silicon solar cells, Metrology, Optical amplifiers

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Proceedings Article | 24 July 1998 Paper

Paper

Infrastructure and the layout of the Navy Prototype Optical Interferometer at the Lowell Observatory

Nathaniel White, David Mozurkewich, J. Thomas Armstrong, Donald Hutter, Kenneth Johnston, James Clark, Long Ha

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317113

KEYWORDS: Buildings, Interferometers, Observatories, Electronics, Telescopes, Prototyping, Roads, Control systems, Metals, Imaging arrays

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Proceedings Article | 24 July 1998 Paper

Paper

Bootstrapping the NPOI: keeping long baselines in phase by tracking fringes on short baselines

J. Thomas Armstrong, David Mozurkewich, Thomas Pauls, Arsen Hajian

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317111

KEYWORDS: Visibility, Interferometers, Aluminum, Stars, Signal to noise ratio, Optical tracking, Spatial frequencies, Data modeling, Prototyping, Phase shift keying

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Proceedings Article | 24 July 1998 Paper

Paper

Design of the long delay lines for the Navy Prototype Optical Interferometer

James Clark, Long Ha, David Mozurkewich, J. Thomas Armstrong

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317118

KEYWORDS: Mirrors, Light emitting diodes, Charge-coupled devices, Interferometers, Prototyping, Aluminum, Ocean optics, CCD cameras, Optical alignment, Actuators

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Proceedings Article | 24 July 1998 Paper

Paper

Observations of stellar limb darkening with the Navy Prototype Optical Interferometer

Thomas Pauls, David Mozurkewich, J. Thomas Armstrong, Christian Hummel, James Benson, Arsen Hajian

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317112

KEYWORDS: Stars, Interferometers, Spatial frequencies, Data modeling, Visibility, Atmospheric modeling, Prototyping, Ocean optics, Phase measurement, Observatories

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Proceedings Article | 24 July 1998 Paper

Paper

Active optical fringe tracking at the NPOI

James Benson, David Mozurkewich, Stuart Jefferies

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317117

KEYWORDS: Modulation, Photon counting, Spectrometers, Optical tracking, Visibility, Fourier transforms, Active optics, Ocean optics, Analytical research, Phase shift keying

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Proceedings Article | 24 July 1998 Paper

Paper

Atmospheric power spectra

David Mozurkewich

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317115

KEYWORDS: Turbulence, Atmospheric turbulence, Interferometers, Astronomy, Data modeling, Data centers, Atmospheric sensing, Analytical research, Remote sensing, Optical interferometry

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Proceedings Article | 9 June 1994 Paper

Paper

Progress report on the construction of the Navy Prototype Optical Interferometer at the Lowell Observatory

Nathaniel White, Robert Millis, Otto Franz, J. Michael Loven, Donald Hutter, Kenneth Johnston, J. Thomas Armstrong, David Mozurkewich

Proceedings Volume 2200, (1994) https://doi.org/10.1117/12.177245

KEYWORDS: Interferometers, Observatories, Buildings, Prototyping, Metrology, Roads, Telescopes, Imaging arrays, Analytical research, Metals

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Proceedings Article | 9 June 1994 Paper

Paper

Hybrid design for a six-way beam combiner

David Mozurkewich

Proceedings Volume 2200, (1994) https://doi.org/10.1117/12.177285

KEYWORDS: Modulation, Beam splitters, Sensors, Phase shift keying, Phase measurement, Photons, Metrology, Charge-coupled devices, Stars, Mirrors

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Proceedings Article | 1 August 1990 Paper

Paper

Optical diameters of stars measured with the Mt. Wilson Mark III interferometer

Richard Simon, David Mozurkewich, Kenneth Johnston, Ralph Gaume, Donald Hutter, P. Bowers, M. Mark Colavita, Michael Shao

Proceedings Volume 1237, (1990) https://doi.org/10.1117/12.19304

KEYWORDS: Stars, Calibration, Interferometers, Visibility, Interferometry, Data acquisition, Modulation, Photons, Michelson interferometers, Optical filters

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Proceedings Article | 1 August 1990 Paper

Paper

Optical observations of close binaries with the Mark III Stellar Interferometer

Xiaopei Pan, Michael Shao, M. Mark Colavita, J. Thomas Armstrong, David Mozurkewich, Richard Simon, C. Denisson, Maddali Vivekanand, Kenneth Johnston

Proceedings Volume 1237, (1990) https://doi.org/10.1117/12.19303

KEYWORDS: Interferometers, Spectroscopy, Binary data, Stars, Visualization, Interferometry, Calibration, Visibility, Analytical research, Speckle interferometry

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Proceedings Article | 1 August 1990 Paper

Paper

Big optical array

David Mozurkewich, Kenneth Johnston, Richard Simon

Proceedings Volume 1237, (1990) https://doi.org/10.1117/12.19286

KEYWORDS: Stars, Optical arrays, Interferometry, Interferometers, Imaging systems, Mirrors, Beam splitters, Image resolution, Radio optics, Space telescopes

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Showing 5 of 84 publications

Conference Committee Involvement (1)

Interferometry for Optical Astronomy II

22 August 2002 | Waikoloa, Hawai'i, United States

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