Dr. Hanying Zhou Profile

Dr. Hanying Zhou

Technical Staff at Jet Propulsion Lab

SPIE Involvement:

Author

Publications (52)

SPIE Journal Paper | 11 October 2023 Open Access

Open Access

End-to-end numerical modeling of the Roman Space Telescope coronagraph

John Krist, John Steeves, Brandon Dube, A.J. Eldorado Riggs, Brian Kern, David Marx, Eric Cady, Hanying Zhou, Ilya Poberezhskiy, Caleb Baker, James McGuire, Bijan Nemati, Gary Kuan, Bertrand Mennesson, John Trauger, Navtej Saini, Sergi Hildebrandt Rafels

JATIS, Vol. 9, Issue 04, 045002, (October 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.4.045002

KEYWORDS: Coronagraphy, Actuators, Space telescopes, Numerical modeling, Wavefronts, Modeling, Stars, Monochromatic aberrations, Polarization, Simulations

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Proceedings Article | 5 October 2023 Poster + Paper

Poster + Paper

Roman coronagraph HOWFSC modeling: case study and raw contrast performance prediction

Hanying Zhou, Brian Kern, Nathan Bush, John Krist, Ilya Poberezhskiy

Proceedings Volume 12680, 1268027 (2023) https://doi.org/10.1117/12.2681773

KEYWORDS: Modeling, Coronagraphy, Calibration, Data modeling, Wavefront sensors, Vacuum, Risk assessment, Optical actuators, Astronomical detectors, Nonlinear control

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Proceedings Article | 5 October 2023 Presentation + Paper

Presentation + Paper

Multi-star wavefront control at the occulting mask coronagraph testbed: monochromatic laboratory demonstration for the Roman Coronagraph instrument

Dan Sirbu, Ruslan Belikov, Eduardo Bendek, David Marx, A. J. Eldorado Riggs, Camilo Mejia Prada, Byoung-Joon Seo, Hanying Zhou

Proceedings Volume 12680, 126800Y (2023) https://doi.org/10.1117/12.2677778

KEYWORDS: Diffraction, Binary stars, Coronagraphy, Stars, Wavefronts, Equipment, Cameras, Vacuum, Planets, Diffraction gratings, Wavefront aberrations

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The Astro2020 decadal survey recommended the Habitable Worlds Observatory (HWO), NASA’s direct imaging flagship mission, with a goal to achieve a statistically robust mission yield of 25 or more potentially habitable exoplanets. One way to achieve is to increase the instrument effectiveness by introducing additional bright, nearby targets. A majority of Sun-like stars have a stellar companion that can introduce additional noise into the field of view of any high-contrast imaging instrument and enabling exoplanet discovery around binary stars represents a path to increased coronagraphic instrument efficiency by increasing the available science target pool of bright nearby stars. This includes both of the Alpha Centauri A and B stars which would represent the top science target for direct imaging if companion leakage could be suppressed. Multi-Star Wavefront Control (MSWC) is a technique that removes stellar leakage from both stellar components, enabling direct imaging of exoplanets in many binary star systems which can potentially increase coronagraphic instrument effectiveness We present the latest testbed results obtained with MSWC as part of the technology development effort focusing on demonstrations conducted on the Occulting Mask Coronagraph (OMC) testbed at JPL during the vacuum test window last winter, with an additional vacuum test planned for this fall. The MSWC mask consists of a shaped pupil mask similar to the one used for the Wide-Field of View mode, but also includes a set of superimposed, regularly spaced dots that serve as a diffraction grating. OMC has a layout similar to the Roman Space Telescope coronagraph instrument and configured with a binary imaging mode with a MSWC mask using same design as the contributed mask for the Roman coronagraph. Our testbed results represent the first demonstrations of this technique using the recently installed full binary source. We present results demonstrating suppression in the Super-Nyquist regime for the third diffraction order reaching 8.7e-9 contrast with the Roman pupil. In addition, we present results obtained with a physical binary source and running MSWC in a binary star regime demonstrating 9.6e-8 contrast for a geometry matching potential Alpha Centauri observations in a 515 nm monochromatic wavelength (similar but bluer than for Band one) using the fifth diffraction order. Planned demonstrations in the upcoming vacuum window this fall will focus on Band 3d and Band 4 using the full MSWC mode for an Alpha Centauri geometry.

Proceedings Article | 5 October 2023 Poster + Paper

Poster + Paper

Testbed multi-star wavefront control experiment modeling analysis

Hanying Zhou, David Marx, Camilo Mejia Prada, Dan Sirbu, Ruslan Belikov

Proceedings Volume 12680, 1268026 (2023) https://doi.org/10.1117/12.2676172

KEYWORDS: Diffraction, Modeling, Coronagraphy, Binary stars, Wavefronts, Point spread functions, Dispersion, Singular value decomposition, Optical sensing, Nonlinear control

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

Roman CGI testbed HOWFSC modeling and validation

Hanying Zhou, John Krist, Byoung-Joon Seo, Brian Kern, Eric Cady, Ilya Poberezhskiy

Proceedings Volume 11443, 114431W (2020) https://doi.org/10.1117/12.2561087

KEYWORDS: Coronagraphy, Wavefronts, Diffraction, Instrument modeling, Observatories, Performance modeling, Deformable mirrors

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Proceedings Article | 13 September 2019 Paper

Paper

Critical characteristics of coronagraph masks influencing high contrast performance

Kunjithapatham Balasubramanian, Byoung-Joon Seo, Keith Patterson, Camilo Mejia Prada, A.J. Eldorado Riggs, Hanying Zhou, Dwight Moody, Eric Cady, Victor White, Karl Yee, Richard Muller, Pierre Echternach, Frank Greer, Daniel Wilson

Proceedings Volume 11117, 111171H (2019) https://doi.org/10.1117/12.2530825

KEYWORDS: Coronagraphy, Tolerancing, Dispersion

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Proceedings Article | 9 September 2019 Presentation + Paper

Presentation + Paper

WFIRST Phase B HLC occulter mask baselining and testbed WFC performance validation

Hanying Zhou, John Krist, Brian Kern, Byoung-Joon Seo, Eric Cady, Bijan Nemati, Dwight Moody, A.J. Eldorado Riggs, David Marx, Daniel Wilson, Kunjithapatham Balasubramanian, Ilya Poberezhskiy, Scott Basinger

Proceedings Volume 11117, 111170H (2019) https://doi.org/10.1117/12.2530672

KEYWORDS: Wavefronts, Tolerancing, Coronagraphy, Telescopes, Performance modeling, Control systems, Mask making, Optical instrument design, Aerospace engineering, Space operations

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Proceedings Article | 18 September 2018 Presentation + Paper

Presentation + Paper

A constellation of MicroSats to search for NEOs

Michael Shao, Hanying Zhou, Slava Turyshev, Chengxing Zhai, Navtej Saini, Russell Trahan

Proceedings Volume 10769, 107690K (2018) https://doi.org/10.1117/12.2322414

KEYWORDS: Telescopes, Sun, Satellites, Large Synoptic Survey Telescope, Signal to noise ratio, Device simulation, Space telescopes, Large telescopes, Solar system, Photons

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Proceedings Article | 16 July 2018 Presentation + Paper

Presentation + Paper

High accuracy coronagraph flight WFC model for WFIRST-CGI raw contrast sensitivity analysis

Hanying Zhou, John Krist, Eric Cady, Ilya Poberezhskiy

Proceedings Volume 10698, 106982M (2018) https://doi.org/10.1117/12.2313719

KEYWORDS: Telescopes, Error analysis, Polarization, Spectroscopy, Wavefronts, Coronagraphy, Contrast sensitivity, Mirrors, Beam shaping, Exoplanets

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Proceedings Article | 1 September 2017 Paper

Paper

Shaped pupil coronagraphy for WFIRST: high-contrast broadband testbed demonstration

Eric Cady, Kunjithapatham Balasubramanian, Jessica Gersh-Range, Jeremy Kasdin, Brian Kern, Raymond Lam, Camilo Mejia Prada, Dwight Moody, Keith Patterson, Ilya Poberezhskiy, A. J. Eldorado Riggs, Byoung-Joon Seo, Fang Shi, Hong Tang, John Trauger, Hanying Zhou, Neil Zimmerman

Proceedings Volume 10400, 104000E (2017) https://doi.org/10.1117/12.2272834

KEYWORDS: Wavefronts, Coronagraphy, Exoplanets, Wavefront sensors, Performance modeling, Systems modeling, Control systems

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Proceedings Article | 1 September 2017 Presentation + Paper

Presentation + Paper

Wavefront control performance modeling with WFIRST shaped pupil coronagraph testbed

Hanying Zhou, Bijian Nemati, John Krist, Eric Cady, Brian Kern, Ilya Poberezhskiy

Proceedings Volume 10400, 1040005 (2017) https://doi.org/10.1117/12.2274391

KEYWORDS: Performance modeling, Wavefronts, Wavefront sensors, Control systems, Systems modeling, Exoplanets, Monte Carlo methods, Imaging systems, Space telescopes, Stars

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Proceedings Article | 1 September 2017 Presentation + Paper

Presentation + Paper

Dynamic testbed demonstration of WFIRST coronagraph low order wavefront sensing and control (LOWFS/C)

Fang Shi, Eric Cady, Byoung-Joon Seo, Xin An, Kunjithapatham Balasubramanian, Brian Kern, Raymond Lam, David Marx, Dwight Moody, Camilo Mejia Prada, Keith Patterson, Ilya Poberezhskiy, Joel Shields, Erkin Sidick, Hong Tang, John Trauger, Tuan Truong, Victor White, Daniel Wilson, Hanying Zhou

Proceedings Volume 10400, 104000D (2017) https://doi.org/10.1117/12.2274887

KEYWORDS: Wavefront sensors, Wavefronts, Mirrors, Deformable mirrors, Environmental sensing, Phase shifting, Optical telescopes, Optical fabrication, Device simulation, Space telescopes

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Proceedings Article | 1 September 2017 Presentation + Paper

Presentation + Paper

WFIRST coronagraph optical modeling

John Krist, A. J. Riggs, James McGuire, Hong Tang, Nikta Amiri, Gary Gutt, Luis Marchen, David Marx, Bijan Nemati, Navtej Saini, Erkin Sidick, Hanying Zhou

Proceedings Volume 10400, 1040004 (2017) https://doi.org/10.1117/12.2274792

KEYWORDS: Performance modeling, Systems modeling, Exoplanets, Spectrographs, Mirrors, Telescopes, Wavefront sensors, Polarization, Tolerancing, MATLAB

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Proceedings Article | 9 August 2016 Paper

Paper

Diffraction modeling of finite subband EFC probing on dark hole contrast with WFIRST-CGI shaped pupil coronagraph

Hanying Zhou, John Krist, Bijan Nemati

Proceedings Volume 9911, 99111S (2016) https://doi.org/10.1117/12.2232129

KEYWORDS: Diffraction, Bandpass filters, Wavefront sensors, Optical filters, Coronagraphy, Error analysis, Wavefronts, Infrared telescopes, Stars, Telescopes

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Proceedings Article | 29 July 2016 Paper

Paper

Closing the contrast gap between testbed and model prediction with WFIRST-CGI shaped pupil coronagraph

Hanying Zhou, Bijan Nemati, John Krist, Eric Cady, Camilo Prada, Brian Kern, Ilya Poberezhskiy

Proceedings Volume 9904, 990419 (2016) https://doi.org/10.1117/12.2232211

KEYWORDS: Speckle, Actuators, Error control coding, Coronagraphy, Wavefronts, Error analysis, Control systems, Data modeling, Monochromatic aberrations, Phase measurement

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Proceedings Article | 29 July 2016 Paper

Paper

Low-signal, coronagraphic wavefront estimation with Kalman filtering in the high contrast imaging testbed

A J Eldorado Riggs, Eric Cady, Camilo Prada, Brian Kern, Hanying Zhou, N. Jeremy Kasdin, Tyler Groff

Proceedings Volume 9904, 99043F (2016) https://doi.org/10.1117/12.2233909

KEYWORDS: Wavefronts, Infrared telescopes, Space telescopes, Telescopes, Coronagraphy, Point spread functions, Exoplanets, Image analysis, Planets, Signal to noise ratio

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Proceedings Article | 18 May 2016 Paper

Paper

Low-CNR inverse synthetic aperture LADAR imaging demonstration with atmospheric turbulence

R. Trahan, B. Nemati, H. Zhou, M. Shao, I. Hahn, W. Schulze

Proceedings Volume 9846, 98460E (2016) https://doi.org/10.1117/12.2224322

KEYWORDS: LIDAR, Atmospheric turbulence, Sensors, Imaging systems, Photodetectors, Transmitters, Fourier transforms, Heterodyning, Signal detection, Image quality

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Proceedings Article | 18 May 2016 Paper

Paper

Low-cost chirp linearization for long-range ISAL imaging application

Hanying Zhou, Bijan Nemati, Mike Shao, Chengxing Zhai, Inseob Hahn, William Schulze, Russell Trahan

Proceedings Volume 9846, 98460D (2016) https://doi.org/10.1117/12.2224122

KEYWORDS: Ferroelectric materials, Turbulence, Receivers, Interferometers, Laser applications, LIDAR, Transmitters, Phase measurement, Tunable lasers, Bragg cells

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SPIE Journal Paper | 7 December 2015

WFIRST-AFTA coronagraph shaped pupil masks: design, fabrication, and characterization

Kunjithapatham Balasubramanian, Victor White, Karl Yee, Pierre Echternach, Richard Muller, Matthew Dickie, Eric Cady, Camilo Prada, Daniel Ryan, Ilya Poberezhskiy, Brian Kern, Hanying Zhou, John Krist, Bijan Nemati, A. J. Eldorado Riggs, Neil Zimmerman, N. Jeremy Kasdin

JATIS, Vol. 2, Issue 01, 011005, (December 2015) https://doi.org/10.1117/12.10.1117/1.JATIS.2.1.011005

KEYWORDS: Photomasks, Silicon, Coronagraphy, Reflectivity, Semiconducting wafers, Aluminum, Point spread functions, Wavefronts, Optical instrument design, Etching

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Proceedings Article | 16 September 2015 Paper

Paper

Laboratory performance of the shaped pupil coronagraphic architecture for the WFIRST/AFTA coronagraph

Eric Cady, Camilo Mejia Prada, Xin An, Kunjithapatham Balasubramanian, Rosemary Diaz, N. Jeremy Kasdin, Brian Kern, Andreas Kuhnert, Bijan Nemati, Keith Patterson, Ilya Poberezhskiy, A. J. Eldorado Riggs, Daniel Ryan, Hanying Zhou, Robert Zimmer, Neil Zimmerman

Proceedings Volume 9605, 96050B (2015) https://doi.org/10.1117/12.2189113

KEYWORDS: Coronagraphy, Photomasks, Telescopes, Point spread functions, Microscopes, Infrared telescopes, Silicon, Binary data, Infrared radiation, Stars

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Proceedings Article | 16 September 2015 Paper

Paper

Exoplanet coronagraph shaped pupil masks and laboratory scale star shade masks: design, fabrication and characterization

Kunjithapatham Balasubramanian, Victor White, Karl Yee, Pierre Echternach, Richard Muller, Matthew Dickie, Eric Cady, Camilo Mejia Prada, Daniel Ryan, Ilya Poberezhskiy, Hanying Zhou, Brian Kern, A. J. Riggs, Neil Zimmerman, Dan Sirbu, Stuart Shaklan, Jeremy Kasdin

Proceedings Volume 9605, 96050L (2015) https://doi.org/10.1117/12.2188954

KEYWORDS: Photomasks, Silicon, Reflectivity, Aluminum, Coronagraphy, Semiconducting wafers, Stars, Wavefronts, Point spread functions, Telescopes

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Proceedings Article | 4 September 2015 Paper

Paper

An overview of WFIRST/AFTA coronagraph optical modeling

John Krist, Bijan Nemati, Hanying Zhou, Erkin Sidick

Proceedings Volume 9605, 960505 (2015) https://doi.org/10.1117/12.2188361

KEYWORDS: Coronagraphy, Wavefronts, Polarization, Point spread functions, Stars, Telescopes, Space telescopes, Monochromatic aberrations, Planets, Mirrors

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Proceedings Article | 2 August 2014 Paper

Paper

Technology development towards WFIRST-AFTA coronagraph

Ilya Poberezhskiy, Feng Zhao, Xin An, Kunjithapatham Balasubramanian, Ruslan Belikov, Eric Cady, Richard Demers, Rosemary Diaz, Qian Gong, Brian Gordon, Renaud Goullioud, Frank Greer, Olivier Guyon, Michael Hoenk, N. Jeremy Kasdin, Brian Kern, John Krist, Andreas Kuhnert, Michael McElwain, Bertrand Mennesson, Dwight Moody, Richard Muller, Bijan Nemati, Keith Patterson, A. J. Riggs, Daniel Ryan, Byoung-Joon Seo, Stuart Shaklan, Erkin Sidick, Fang Shi, Nicholas Siegler, Rémi Soummer, Hong Tang, John Trauger, J. Kent Wallace, Xu Wang, Victor White, Daniel Wilson, Karl Yee, Hanying Zhou, Neil Zimmerman

Proceedings Volume 9143, 91430P (2014) https://doi.org/10.1117/12.2060320

KEYWORDS: Coronagraphy, Sensors, Wavefronts, Wavefront sensors, Iterated function systems, Photomasks, Space telescopes, Exoplanets, Deformable mirrors, Planets

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Proceedings Article | 17 April 2006 Paper

Paper

Recent progress on grayscale optical correlator for automatic target recognition

Tien-Hsin Chao, Thomas Lu, Hanying Zhou

Proceedings Volume 6245, 624503 (2006) https://doi.org/10.1117/12.673441

KEYWORDS: Spatial light modulators, Image filtering, Optical filters, Automatic target recognition, Optical correlators, Algorithm development, Detection and tracking algorithms, Photodetectors, Target detection, Image segmentation

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Proceedings Article | 10 September 2005 Paper

Paper

Neural network post-processing of grayscale optical correlator

Thomas Lu, Casey Hughlett, Hanying Zhou, Tien-Hsin Chao, Jay Hanan

Proceedings Volume 5908, 590810 (2005) https://doi.org/10.1117/12.615573

KEYWORDS: Neural networks, Image filtering, Neurons, Optical correlators, Optical filters, Cameras, Detection and tracking algorithms, Pattern recognition, Image segmentation, Composites

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Proceedings Article | 28 March 2005 Paper

Paper

Development of streamlined OT-MACH-based ATR algorithm for grayscale optical correlator

Hanying Zhou, Casey Hughlett, Jay Hanan, Thomas Lu, Tien-Hsin Chao

Proceedings Volume 5816, (2005) https://doi.org/10.1117/12.607969

KEYWORDS: Image filtering, Algorithm development, Automatic target recognition, Detection and tracking algorithms, Optical correlators, Optical filters, Image analysis, Target detection, Software development, Distortion

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Proceedings Article | 28 March 2005 Paper

Paper

Portable 512 x 512 Grayscale Optical Correlator

Tien-Hsin Chao, Jay Hanan, Hanying Zhou, George Reyes

Proceedings Volume 5816, (2005) https://doi.org/10.1117/12.607965

KEYWORDS: Spatial light modulators, Image filtering, Optical correlators, Optical filters, Photodetectors, Target recognition, Fourier transforms, Automatic target recognition, Optical design, Mirrors

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Proceedings Article | 28 March 2005 Paper

Paper

Closed-loop automatic target recognition and monitoring system

Jay Hanan, Tien-Hsin Chao, Christopher Assad, Casey Hughlett, Hanying Zhou, Thomas Lu

Proceedings Volume 5816, (2005) https://doi.org/10.1117/12.607970

KEYWORDS: Neural networks, Automatic target recognition, Target detection, Optical correlators, Target recognition, Detection and tracking algorithms, Spatial light modulators, Computer simulations, Optical tracking, Digital filtering

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Proceedings Article | 28 March 2005 Paper

Paper

Near IR electro-optic imaging Fourier transform spectrometer

Tien-Hsin Chao, Hanying Zhou, Xiaowei Xia, Steven Serati

Proceedings Volume 5816, (2005) https://doi.org/10.1117/12.607968

KEYWORDS: Wave plates, Switches, Fourier transforms, Spectroscopy, Electro optics, Infrared spectroscopy, Sensors, Electro optical imaging, Infrared imaging, Imaging systems

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Proceedings Article | 12 April 2004 Paper

Paper

Portable 512x512 grayscale optical correlator

Tien-Hsin Chao, Jay Hanan, Hanying Zhou, George Reyes

Proceedings Volume 5437, (2004) https://doi.org/10.1117/12.548059

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Proceedings Article | 12 April 2004 Paper

Paper

On the development of filter management module for grayscale optical correlator

Hanying Zhou, Casey Hughlett, Jay Hanan, Tien-Hsin Chao

Proceedings Volume 5437, (2004) https://doi.org/10.1117/12.548066

KEYWORDS: Image filtering, Optical filters, Optical correlators, Detection and tracking algorithms, Image analysis, Optical signal processing, Tolerancing, Automatic target recognition, Databases, Algorithm development

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Proceedings Article | 12 April 2004 Paper

Paper

Hyperspectral imaging using electro-optic Fourier transform spectrometer

Tien-Hsin Chao, Hanying Zhou, Xiaowei Xia, Steven Serati

Proceedings Volume 5437, (2004) https://doi.org/10.1117/12.548075

KEYWORDS: Fourier transforms, Spectroscopy, Switches, Wave plates, Electro optics, Hyperspectral imaging, Electro optical imaging, Sensors, Polarizers, Imaging systems

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Proceedings Article | 6 August 2003 Paper

Paper

Simulation of miniature optical correlator for future generation of spacecraft precision landing

Hanying Zhou, Tien-Hsin Chao, Bryan Martin, Nate Villaume

Proceedings Volume 5106, (2003) https://doi.org/10.1117/12.501410

KEYWORDS: Optical correlators, Space operations, Device simulation, Image processing, Image resolution, Visualization, Optical simulations, Cameras, Software development, Spatial light modulators

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Proceedings Article | 6 August 2003 Paper

Paper

Real-time automatic target recognition using a compact 512x512 grayscale optical correlator

Tien-Hsin Chao, Hanying Zhou, George Reyes, Jay Hanan

Proceedings Volume 5106, (2003) https://doi.org/10.1117/12.501402

KEYWORDS: Spatial light modulators, Automatic target recognition, Optical correlators, Image filtering, Target detection, Optical filters, Packaging, Fourier transforms, Beam splitters, Sensors

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Proceedings Article | 6 August 2003 Paper

Paper

Precision of a radial basis function neural network tracking method

Jay Hanan, Hanying Zhou, Tien-Hsin Chao

Proceedings Volume 5106, (2003) https://doi.org/10.1117/12.501406

KEYWORDS: Neurons, Automatic tracking, Neural networks, Nose, Optical tracking, Feature extraction, Detection and tracking algorithms, Video, Computer simulations, Chaos

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Proceedings Article | 20 November 2002 Paper

Paper

High-speed high-density holographic memory using electro-optic beam steering devices

Tien-Hsin Chao, Hanying Zhou, George Reyes, Danut Dragoi, Jay Hanan

Proceedings Volume 4803, (2002) https://doi.org/10.1117/12.452712

KEYWORDS: Holography, Beam steering, Spatial light modulators, Electro optics, Data storage, Holograms, Crystals, Multiplexing, Earth sciences, Laser crystals

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Proceedings Article | 16 September 2002 Paper

Paper

High-speed optical object recognition processor with massive holographic memory

Tien-Hsin Chao, Hanying Zhou, George Reyes

Proceedings Volume 4929, (2002) https://doi.org/10.1117/12.483219

KEYWORDS: Spatial light modulators, Holography, Image filtering, Optical filters, Fourier transforms, Optical correlators, Object recognition, Beam splitters, Semiconductor lasers, Mirrors

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Proceedings Article | 6 March 2002 Paper

Paper

Compact 512 x 512 grayscale optical correlator

Tien-Hsin Chao, Hanying Zhou, George Reyes

Proceedings Volume 4734, (2002) https://doi.org/10.1117/12.458412

KEYWORDS: Spatial light modulators, Fourier transforms, Optical correlators, Image filtering, Automatic target recognition, Optical filters, Beam splitters, Semiconductor lasers, Space operations, Tolerancing

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Proceedings Article | 6 March 2002 Paper

Paper

Spacecraft navigation using a grayscale optical correlator

Tien-Hsin Chao, Hanying Zhou, George Reyes

Proceedings Volume 4734, (2002) https://doi.org/10.1117/12.458405

KEYWORDS: Optical correlators, Spatial light modulators, Space operations, Image filtering, Target detection, Target recognition, Optical filters, Optical pattern recognition, Fourier transforms, Detection and tracking algorithms

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Proceedings Article | 20 March 2001 Paper

Paper

Compact holographic memory and its application to optical pattern recognition

Tien-Hsin Chao, George Reyes, Hanying Zhou

Proceedings Volume 4387, (2001) https://doi.org/10.1117/12.421152

KEYWORDS: Holography, Image filtering, Holograms, Data storage, Optical filters, Beam steering, Crystals, Optical pattern recognition, Spatial light modulators, Laser crystals

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Proceedings Article | 20 March 2001 Paper

Paper

Grayscale optical correlator for real-time onboard ATR

Tien-Hsin Chao, Hanying Zhou, George Reyes

Proceedings Volume 4387, (2001) https://doi.org/10.1117/12.421138

KEYWORDS: Spatial light modulators, Image filtering, Computer generated holography, Automatic target recognition, Modulation, Computer programming, Linear filtering, Optical correlators, Optical filters, Space operations

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SPIE Journal Paper | 1 May 2000

Data reduction via the wavelet transform for the synthesis of the projection-slice filter

Vahid Riasati, Hanying Zhou, Tien-Hsin Chao, Don Gregory

OE, Vol. 39, Issue 05, (May 2000) https://doi.org/10.1117/12.10.1117/1.602489

KEYWORDS: Image filtering, Wavelet transforms, Phase only filters, Image compression, Wavelets, Optical filters, Fourier transforms, Fused deposition modeling, Distortion, Computer simulations

Proceedings Article | 31 March 2000 Paper

Paper

512x512 high-speed grayscale optical correlator

Tien-Hsin Chao, Hanying Zhou, George Reyes

Proceedings Volume 4043, (2000) https://doi.org/10.1117/12.381617

KEYWORDS: Spatial light modulators, Optical correlators, Optical filters, Automatic target recognition, Image filtering, Target detection, Digital filtering, Reflectivity, Fourier transforms, Composites

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Proceedings Article | 31 March 2000 Paper

Paper

Clutter rejection via the wavelet transform for improved target detection using the projection-slice synthetic discriminant function filters

Vahid Riasati, Tien-Hsin Chao, Hanying Zhou, Don Gregory

Proceedings Volume 4043, (2000) https://doi.org/10.1117/12.381593

KEYWORDS: Wavelet transforms, Image filtering, Target detection, Wavelets, Fourier transforms, Optical filters, Chaos, Detection and tracking algorithms, Optical pattern recognition, Object recognition

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Proceedings Article | 31 March 2000 Paper

Paper

Practical filter dynamic range compression for grayscale optical correlator using bipolar-amplitude SLM

Hanying Zhou, Tien-Hsin Chao, George Reyes

Proceedings Volume 4043, (2000) https://doi.org/10.1117/12.381583

KEYWORDS: Optical filters, Spatial light modulators, Optical correlators, Optimal filtering, Image filtering, Nonlinear filtering, Distortion, Tolerancing, Chaos, Modulation

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Proceedings Article | 28 June 1999 Paper

Paper

High-density holographic memory and its applications to optical pattern recognition

Tien-Hsin Chao, Hanying Zhou, George Reyes

Proceedings Volume 3864, 38641M (1999) https://doi.org/10.1117/12.997668

KEYWORDS: Holography, Image filtering, Optical filters, Optical correlators, Optical pattern recognition, Spatial light modulators, Automatic target recognition, Image resolution, Pattern recognition, Acousto-optics

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Proceedings Article | 9 March 1999 Paper

Paper

MACH filter synthesizing for detecting targets in cluttered environment for grayscale optical correlator

Hanying Zhou, Tien-Hsin Chao

Proceedings Volume 3715, (1999) https://doi.org/10.1117/12.341322

KEYWORDS: Optical filters, Optical correlators, Target detection, Image filtering, Optimal filtering, Modulation, Distortion, Tolerancing, Spatial light modulators, Environmental sensing

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Proceedings Article | 9 March 1999 Paper

Paper

Automatic target recognition field demonstration using a grayscale optical correlator

Tien-Hsin Chao, George Reyes, Hanying Zhou

Proceedings Volume 3715, (1999) https://doi.org/10.1117/12.341323

KEYWORDS: Spatial light modulators, Optical filters, Optical correlators, Image filtering, Automatic target recognition, Modulation, Fourier transforms, Sensors, Relays, Composites

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Proceedings Article | 25 October 1996 Paper

Paper

Nonlinear photorefractive volume holograms: spectral and spatial diffraction properties

Feng Zhao, Hanying Zhou

Proceedings Volume 2849, (1996) https://doi.org/10.1117/12.255476

KEYWORDS: Holograms, Diffraction, Crystals, Laser crystals, Multiplexing, Nonlinear crystals, Anisotropy, 3D image reconstruction, Volume holography, Holography

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SPIE Journal Paper | 1 July 1996

Temperature dependence of light-induced scattering in a Ce:Fe:LiNbO3 photorefractive crystal

Feng Zhao, Hanying Zhou, Zhongkong Wu, Francis Yu, Deanna McMillen

OE, Vol. 35, Issue 07, (July 1996) https://doi.org/10.1117/12.10.1117/1.600775

KEYWORDS: Crystals, Scattering, Signal to noise ratio, Light scattering, Laser scattering, Laser crystals, Ions, Electrons, Interference (communication), Two wave mixing

Proceedings Article | 18 August 1995 Paper

Paper

Temperature dependence of light-induced scattering in a Ce:Fe:LiNbO3 photorefractive crystal

Feng Zhao, Hanying Zhou, Zhongkong Wu, Francis Yu, Deanna McMillen

Proceedings Volume 2529, (1995) https://doi.org/10.1117/12.217024

KEYWORDS: Crystals, Scattering, Signal to noise ratio, Light scattering, Laser scattering, Ions, Electrons, Interference (communication), Thermal effects, Denoising

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SPIE Journal Paper | 1 November 1993

Improved interclass multiobject discrimination with phase-difference prewhitening technique

Hanying Zhou, Feng Zhao, Francis Yu, Tien-Hsin Chao

OE, Vol. 32, Issue 11, (November 1993) https://doi.org/10.1117/12.10.1117/12.150681

KEYWORDS: Optimal filtering, Optical filters, Phase only filters, Composites, Image filtering, Computer simulations, Linear filtering, Electronic filtering, Detection and tracking algorithms, Phase shifts

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Showing 5 of 52 publications

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