Dr. Jeremy D. Murphy Profile

Dr. Jeremy D. Murphy

Grad Student at Princeton Univ

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Author

Publications (10)

Proceedings Article | 14 July 2014 Paper

The construction, alignment, and installation of the VIRUS spectrograph

Sarah Tuttle, Gary Hill, Hanshin Lee, Brian Vattiat, Eva Noyola, Niv Drory, Mark Cornell, Trent Peterson, Taylor Chonis, Richard Allen, Gavin Dalton, Darren DePoy, Doug Edmonston, Maximillian Fabricius, Dionne Haynes, Andreas Kelz, Martin Landriau, Michael Lesser, Bob Leach, Jennifer Marshall, Jeremy Murphy, David Perry, Travis Prochaska, Jason Ramsey, Richard Savage

Proceedings Volume 9147, 91470R (2014) https://doi.org/10.1117/12.2056503

KEYWORDS: Spectrographs, Sensors, Cameras, Telescopes, Optical fibers, Quantum efficiency, Collimators, Electronics, Optical amplifiers, Cryogenics

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Proceedings Article | 10 July 2014 Paper

VIRUS: production and deployment of a massively replicated fiber integral field spectrograph for the upgraded Hobby-Eberly Telescope

Gary Hill, Sarah Tuttle, Niv Drory, Hanshin Lee, Brian Vattiat, D. DePoy, J. Marshall, Andreas Kelz, Dionne Haynes, Maximilian Fabricius, Karl Gebhardt, Richard Allen, Heiko Anwad, Ralf Bender, Guillermo Blanc, Taylor Chonis, Mark Cornell, Gavin Dalton, John Good, Thomas Jahn, Hermanus Kriel, Martin Landriau, Phillip MacQueen, J. Murphy, Trent Peterson, Travis Prochaska, Harald Nicklas, Jason Ramsey, M. Roth, Richard Savage, Jan Snigula

Proceedings Volume 9147, 91470Q (2014) https://doi.org/10.1117/12.2056911

KEYWORDS: Spectrographs, Sensors, Cameras, Telescopes, Collimators, Prototyping, Charge-coupled devices, Diffraction gratings, Mirrors, Cryogenics

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Proceedings Article | 10 July 2014 Paper

VIRUS: assembly, testing and performance of 33,000 fibres for HETDEX

Andreas Kelz, Thomas Jahn, D. Haynes, G. Hill, H. Lee, J. Murphy, Justus Neumann, Harald Nicklas, M. Rutowska, C. Sandin, O. Streicher, S. Tuttle, M. Fabricius, S. Bauer, B. Vattiat, H. Anwand, R. Savage

Proceedings Volume 9147, 914775 (2014) https://doi.org/10.1117/12.2056384

KEYWORDS: Spectrographs, Head, Polishing, Image quality, Telescopes, Surface finishing, Inspection, Optical fibers, Sensors, Point spread functions

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Proceedings Article | 24 September 2012 Paper

The influence of motion and stress on optical fibers

Jeremy Murphy, Gary Hill, Phillip MacQueen, Trey Taylor, Ian Soukup, Walter Moreira, Mark Cornell, John Good, Seth Anderson, Lindsay Fuller, Hanshin Lee, Andreas Kelz, Marc Rafal, Tom Rafferty, Sarah Tuttle, Brian Vattiat

Proceedings Volume 8446, 84465F (2012) https://doi.org/10.1117/12.925496

KEYWORDS: Optical fibers, Head, Telescopes, Spectrographs, Polishing, Light scattering, Cameras, Mirrors, Solids, Device simulation

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We report on extensive testing carried out on the optical fibers for the VIRUS instrument. The primary result of this work explores how 10+ years of simulated wear on a VIRUS fiber bundle affects both transmission and focal ratio degradation (FRD) of the optical fibers. During the accelerated lifetime tests we continuously monitored the fibers for signs of FRD. We find that transient FRD events were common during the portions of the tests when motion was at telescope slew rates, but dropped to negligible levels during rates of motion typical for science observation. Tests of fiber transmission and FRD conducted both before and after the lifetime tests reveal that while transmission values do not change over the 10+ years of simulated wear, a clear increase in FRD is seen in all 18 fibers tested. This increase in FRD is likely due to microfractures that develop over time from repeated flexure of the fiber bundle, and stands in contrast to the transient FRD events that stem from localized stress and subsequent modal diffusion of light within the fibers. There was no measurable wavelength dependence on the increase in FRD over 350 nm to 600 nm. We also report on bend radius tests conducted on individual fibers and find the 266 μm VIRUS fibers to be immune to bending-induced FRD at bend radii of R 10 cm. Below this bend radius FRD increases slightly with decreasing radius. Lastly, we give details of a degradation seen in the fiber bundle currently deployed on the Mitchell Spectrograph (formally VIRUS-P) at McDonald Observatory. The degradation is shown to be caused by a localized shear in a select number of optical fibers that leads to an explosive form of FRD. In a few fibers, the overall transmission loss through the instrument can exceed 80%. These results are important for the VIRUS instrument, and for both current and proposed instruments that make use of optical fibers, particularly when the fibers are in continual motion during an observation, or experience repeated mechanical stress during their deployment.≥

Proceedings Article | 24 September 2012 Paper

VIRUS: production of a massively replicated 33k fiber integral field spectrograph for the upgraded Hobby-Eberly Telescope

Gary Hill, Sarah Tuttle, Hanshin Lee, Brian Vattiat, Mark Cornell, D. DePoy, Niv Drory, Maximilian Fabricius, Andreas Kelz, J. Marshall, J. Murphy, Travis Prochaska, Richard Allen, Ralf Bender, Guillermo Blanc, Taylor Chonis, Gavin Dalton, Karl Gebhardt, John Good, Dionne Haynes, Thomas Jahn, Phillip MacQueen, M. Rafal, M. Roth, R. Savage, Jan Snigula

Proceedings Volume 8446, 84460N (2012) https://doi.org/10.1117/12.925434

KEYWORDS: Spectrographs, Sensors, Cameras, Telescopes, Mirrors, Prototyping, Collimators, Charge-coupled devices, Cryogenics, Galactic astronomy

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Proceedings Article | 20 July 2010 Paper

Design of the fiber optic support system and fiber bundle accelerated life test for VIRUS

Ian Soukup, Joseph Beno, Richard Hayes, James Heisler, Jason Mock, Nicholas Mollison, John Good, Gary Hill, Brian Vattiat, Jeremy Murphy, Seth Anderson, Svend Bauer, Andreas Kelz, Martin Roth, Eric Fahrenthold

Proceedings Volume 7735, 77354W (2010) https://doi.org/10.1117/12.856968

KEYWORDS: Telescopes, Actuators, Accelerated life testing, Space telescopes, Optical fibers, Fiber optics, Optical instrument design, Structured optical fibers, Optical benches, Motion models

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Proceedings Article | 15 July 2010 Paper

VIRUS: a massively replicated 33k fiber integral field spectrograph for the upgraded Hobby-Eberly Telescope

Gary Hill, Hanshin Lee, Brian Vattiat, Joshua Adams, J. Marshall, Niv Drory, D. DePoy, Guillermo Blanc, Ralf Bender, John Booth, Taylor Chonis, Mark Cornell, Karl Gebhardt, John Good, Frank Grupp, Roger Haynes, Andreas Kelz, Phillip MacQueen, Nick Mollison, J. Murphy, M. Rafal, W. Rambold, M. Roth, R. Savage, M. Smith

Proceedings Volume 7735, 77350L (2010) https://doi.org/10.1117/12.857808

KEYWORDS: Spectrographs, Sensors, Telescopes, Cameras, Collimators, Mirrors, Prototyping, Charge-coupled devices, Cryogenics, Galactic astronomy

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Proceedings Article | 23 July 2008 Paper

Focal ratio degradation and transmission in VIRUS-P optical fibers

Jeremy Murphy, Phillip MacQueen, Gary Hill, Frank Grupp, Andreas Kelz, Povilas Palunas, Martin Roth, Alexander Fry

Proceedings Volume 7018, 70182T (2008) https://doi.org/10.1117/12.788411

KEYWORDS: Mirrors, Optical fibers, Optical fabrication, Spectrographs, Polishing, Silica, Head, Cameras, Observatories, Telescopes

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Proceedings Article | 9 July 2008 Paper

Current status of the HETDEX fiber optic support system

John Good, Gary Hill, Nicholas Mollison, Brian Vattiat, Jeremy Murphy, Andreas Klez, Martin Roth, Phillip MacQueen, Marc Rafal, Richard Savage, Michael Smith, Amanda Bayless

Proceedings Volume 7014, 70147L (2008) https://doi.org/10.1117/12.790256

KEYWORDS: Fiber optics, Head, Telescopes, Spectroscopy, Spectrographs, Structured optical fibers, Mirrors, Cameras, Optical fibers, Bridges

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Proceedings Article | 9 July 2008 Paper

Design, construction, and performance of VIRUS-P: the prototype of a highly replicated integral-field spectrograph for HET

Gary Hill, Phillip MacQueen, Michael Smith, Joseph Tufts, Martin Roth, Andreas Kelz, Joshua Adams, Niv Drory, Frank Grupp, Stuart Barnes, Guillermo Blanc, Jeremy Murphy, Werner Altmann, Gordon Wesley, Pedro Segura, John Good, John Booth, Svend-Marian Bauer, Emil Popow, John Goertz, Robert Edmonston, Christopher Wilkinson

Proceedings Volume 7014, 701470 (2008) https://doi.org/10.1117/12.790235

KEYWORDS: Spectrographs, Sensors, Cameras, Telescopes, Collimators, Mirrors, Prototyping, Image quality, Galactic astronomy, Lanthanum

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Showing 5 of 10 publications

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