Dr. David J. Sahnow Profile

Dr. David J. Sahnow

Consulting Staff Scientist at Space Telescope Science Institute

SPIE Involvement:

Author

Publications (41)

Proceedings Article | 5 October 2023 Presentation + Paper

Improved characterization of pulse height changes in the far ultraviolet detector of the cosmic origins explorer (COS)

David Sahnow, Christian Johnson

Proceedings Volume 12678, 126780W (2023) https://doi.org/10.1117/12.2677617

KEYWORDS: Far ultraviolet, Image segmentation, Airglow, Data modeling, Spectrographs, Spectral resolution, Microchannel plates, Hubble Space Telescope, Calibration, Equipment

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Proceedings Article | 31 August 2022 Poster + Paper

Optical modeling of new lifetime positions for the Cosmic Origins Spectrograph (COS)

David Sahnow

Proceedings Volume 12181, 1218136 (2022) https://doi.org/10.1117/12.2630389

KEYWORDS: Sensors, Data modeling, Spectrographs, Point spread functions, Instrument modeling, Spectral resolution, Performance modeling, Code v, Optical design, Hubble Space Telescope

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Proceedings Article | 24 August 2021 Poster + Presentation + Paper

Extending the life of the Cosmic Origins Spectrograph (COS) with new lifetime positions

David Sahnow, Thomas Ake, Dzhuliya Dashtamirova, Serge Dieterich, Travis Fischer, William Fischer, Elaine Frazer, Alec Hirschauer, Nick Indriolo, Bethan James, Robert Jedrzejewski, Christian Johnson, Nathaniel Kerman, Lauren Miller, Rachel Plesha, Marc Rafelski, Kate Rowlands, Julia Roman-Duval, Ravi Sankrit, David Soderblom

Proceedings Volume 11821, 118211H (2021) https://doi.org/10.1117/12.2594922

KEYWORDS: Sensors, Calibration, Spectrographs, Spectral calibration, Spectral resolution, Microchannel plates, Lamps, Hubble Space Telescope, Image resolution, Far ultraviolet

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Proceedings Article | 6 July 2018 Paper

COS2025: a strategy to extend the lifetime of the FUV detector on the Cosmic Origins Spectrograph

David Sahnow, Gisella de Rosa, John MacKenty, Cristina Oliveira, Steven Penton, Julia Roman-Duval

Proceedings Volume 10699, 106992U (2018) https://doi.org/10.1117/12.2312916

KEYWORDS: Sensors, Airglow, Microchannel plates, Spectrographs, Calibration, Hubble Space Telescope, Photons

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The Cosmic Origins Spectrograph (COS) has been collecting data since soon after its installation on the Hubble Space Telescope in May 2009. The two-segment microchannel plate-based detector for the FUV channel is subject to gain sag, and eventually a permanent loss of efficiency at the locations where the largest number of counts have fallen. The initial strategy for the use of the detector was to maximize the scientific productivity of the instrument over the five-year design lifetime. This has been accomplished by periodically adjusting the high voltage and moving the spectra to a different location on the detector in order to spread the damage on the detector and thus minimize gain sag. The instrument is now well past this point and performing well, so in late 2016 we began to investigate ways to extend the life of the detector for as long as possible without seriously affecting the scientific performance. As a result of these studies, we adopted a new lifetime extension strategy when the spectra were moved to Lifetime Position 4 (LP4) in October 2017, and placed restrictions on the G130M observing modes that put Lyman-α airglow lines on the detector. Central wavelengths 1300, 1309, 1318, and 1327 are no longer permitted to illuminate Segment B of the detector, and G130M/1291 is permitted on that segment only for FP-POS values 3 and 4 in order to concentrate the damage to the detector. These changes limit the damage from gain sag “holes” due to airglow to only two locations on the detector, rather than the twenty at the previous LPs. In addition, we modified our previous approach of increasing the high voltage or changing LPs before any hole experienced a sensitivity loss of 5%, and will permit the two G130M/1291 holes to become permanently sagged, thus creating a new detector gap. Science programs that require wavelength coverage near the rest-frame Lyman-α region (1216 Å) can be executed at LP3. Observations with other gratings remain unaffected, but the wavelength coverage on Segment B for a single exposure will now include gaps due to the gain sag holes from the G130M/1291 observations. Models of gain loss as a function of exposure suggest that by adopting this strategy and giving up these small regions of the detector, we will be able to use LP4 productively for six or more years, as opposed to the ~2.5 years that was available at previous positions.

Proceedings Article | 5 September 2017 Paper

ACCESS: integration and pre-flight performance

Mary Elizabeth Kaiser, Matthew Morris, Lauren Aldoroty, Russell Pelton, Robert Kurucz, Grant Peacock, Jason Hansen, Stephan McCandliss, Bernard Rauscher, Randy Kimble, Jeffrey Kruk, Edward Wright, Joseph Orndorff, Paul Feldman, H. Warren Moos, Adam Riess, Jonathan Gardner, Ralph Bohlin, Susana Deustua, W. Dixon, David Sahnow, Saul Perlmutter

Proceedings Volume 10398, 1039815 (2017) https://doi.org/10.1117/12.2274637

KEYWORDS: Calibration, Sensors, Standards development, Space telescopes, Spectrographs, Aerospace engineering, Mercury cadmium telluride, Stars, Near infrared, Rockets

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Proceedings Article | 18 July 2016 Paper

Correcting for errors due to walk and geometric distortion in the COS FUV detector

David Sahnow, Steven Penton, Thomas Ake, Gisella DeRosa, Justin Ely, Sean Lockwood, Cristina Oliveira, Rachel Plesha, Charles Proffitt, Julia Roman-Duval, Paule Sonnentrucker, Joanna Taylor, James White

Proceedings Volume 9905, 99052T (2016) https://doi.org/10.1117/12.2233091

KEYWORDS: Ultraviolet radiation, Point spread functions, Apodization, Niobium, Electroluminescent displays, Numerical simulations, Opacity, Imaging systems, Space telescopes, Binary data

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Proceedings Article | 18 September 2015 Paper

Characterizing, controlling, and correcting distortions in the COS FUV detector

David Sahnow, George Becker, John Debes, Justin Ely, Sean Lockwood, Derck Massa, Cristina Oliveira, Steven Penton, Charles Proffitt, Julia Roman-Duval, Hugues Sana, Paule Sonnentrucker, Joanna Taylor

Proceedings Volume 9601, 96010Q (2015) https://doi.org/10.1117/12.2188529

KEYWORDS: Sensors, Calibration, Microchannel plates, Electronics, Target acquisition, Spectral calibration, Spectrographs, Hubble Space Telescope, Analog electronics, Dispersion

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Proceedings Article | 2 August 2014 Paper

ACCESS: status and pre-flight performance

Mary Elizabeth Kaiser, Matthew Morris, Grant Peacock, Stephan McCandliss, Bernard Rauscher, Randy Kimble, Jeffrey Kruk, Russell Pelton, Edward Wright, D. Brent Mott, Yiting Wen, Paul Feldman, H. Warren Moos, Adam Riess, Jonathan Gardner, Dominic Benford, Bruce Woodgate, Ralph Bohlin, Susana Deustua, W. Dixon, David Sahnow, Robert Kurucz, Michael Lampton, Saul Perlmutter

Proceedings Volume 9143, 91434Y (2014) https://doi.org/10.1117/12.2057689

KEYWORDS: Spectrographs, Sensors, Camera shutters, Telescopes, Stars, Computer programming, Computing systems, Field programmable gate arrays, Calibration, Standards development

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Proceedings Article | 26 September 2013 Paper

Characterization, modeling, and management of the COS FUV detector lifetime

David Sahnow, Alessandra Aloisi, K. Azalee Bostroem, John Debes, Justin Ely, Philip Hodge, Gerard Kriss, Derck Massa, Cristina Oliveira, Rachel Osten, Steven Osterman, Steven Penton, Charles Proffitt, Julia Roman-Duval, Paule Sonnentrucker

Proceedings Volume 8859, 88590S (2013) https://doi.org/10.1117/12.2024708

KEYWORDS: Sensors, Microchannel plates, Ultraviolet radiation, Spectrographs, Hubble Space Telescope, Calibration, Far ultraviolet, Solar processes, Airglow, X-ray astronomy

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Proceedings Article | 26 September 2013 Paper

ACCESS: thermal mechanical design and performance

Mary Kaiser, Matthew Morris, Jason Hansen, Scott Jensen, Stephan McCandliss, Bernard Rauscher, Randy Kimble, Jeffrey Kruk, Russell Pelton, D. Brent Mott, Yiting Wen, Jonathan Gardner, Dominic Benford, Bruce Woodgate, Edward Wright, Paul Feldman, H. Warren Moos, Adam Riess, Ralph Bohlin, Susana Deustua, W. Dixon, David Sahnow, Robert Kurucz, Michael Lampton, Saul Perlmutter

Proceedings Volume 8860, 88600Y (2013) https://doi.org/10.1117/12.2024571

KEYWORDS: Sensors, Spectrographs, Calibration, Telescopes, Camera shutters, Stars, Standards development, Rockets, Skin, Copper

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Proceedings Article | 21 September 2012 Paper

ACCESS: design and sub-system performance

Mary Elizabeth Kaiser, Matthew Morris, Stephan McCandliss, Bernard Rauscher, Randy Kimble, Jeffrey Kruk, Russell Pelton, D. Mott, Yiting Wen, Roger Foltz, Manuel Quijada, Jeffery Gum, Jonathan Gardner, Duncan Kahle, Dominic Benford, Bruce Woodgate, Edward Wright, Paul Feldman, Murdock Hart, H. Warren Moos, Adam Riess, Ralph Bohlin, Susana Deustua, W. Dixon, David Sahnow, Robert Kurucz, Michael Lampton, Saul Perlmutter

Proceedings Volume 8442, 844246 (2012) https://doi.org/10.1117/12.927204

KEYWORDS: Sensors, Calibration, Mirrors, Telescopes, Reflectivity, Stars, Spectrographs, Collimators, Coating, Standards development

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Proceedings Article | 17 September 2012 Paper

The COS FUV channel: on-orbit performance trends and early characterization of a new detector lifetime position

David Sahnow, Alessandra Aloisi, K. Azalee Bostroem, John Debes, Julia Duval, Justin Ely, Philip Hodge, Gerard Kriss, Kevin Lindsay, Derck Massa, Cristina Oliveira, Rachel Osten, Steven Osterman, Steven Penton, Charles Proffitt, Paule Sonnentrucker, Brian York

Proceedings Volume 8443, 84434C (2012) https://doi.org/10.1117/12.926487

KEYWORDS: Sensors, Microchannel plates, Calibration, Spectrographs, Lamps, Far ultraviolet, Photons, Image segmentation, Hubble Space Telescope, Ultraviolet radiation

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Proceedings Article | 14 September 2011 Paper

Gain sag in the FUV detector of the Cosmic Origins Spectrograph

David Sahnow, Cristina Oliveira, Alessandra Aloisi, Philip Hodge, Derck Massa, Rachel Osten, Charles Proffitt, Azalee Bostroem, Jason McPhate, Stéphane Béland, Steven Osterman, Steven Penton

Proceedings Volume 8145, 81450Q (2011) https://doi.org/10.1117/12.893989

KEYWORDS: Sensors, Image segmentation, Microchannel plates, Airglow, Photons, Calibration, Spectrographs, Electrons, Distortion, Lamps

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Proceedings Article | 11 August 2010 Paper

Commissioning of the cosmic origins spectrograph on the Hubble Space Telescope: an overview of COS servicing mission observatory verification

David Sahnow, Charles Keyes, Thomas Ake, Alessandra Aloisi, Stéphane Béland, Carl Biagetti, Eric Burgh, George Chapman, Thomas Delker, Kevin France, Scott Friedman, Cynthia Froning, Parviz Ghavamian, Paul Goudfrooij, James Green, George Hartig, Philip Hodge, Daniel Lennon, Derck Massa, Jason McPhate, Sami-Matias Niemi, Cristina Oliveira, Rachel Osten, Steven Osterman, Steven Penton, Merle Reinhart, Brittany Shaw, T. Ed Smith, David Soderblom, Alan Welty, Thomas Wheeler, Brian York, Wei Zheng

Proceedings Volume 7731, 773139 (2010) https://doi.org/10.1117/12.858058

KEYWORDS: Sensors, Intelligence systems, Calibration, Target acquisition, Spectrographs, Lamps, Hubble Space Telescope, Observatories, Imaging spectroscopy, Spectroscopy

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Proceedings Article | 11 August 2010 Paper

Monitoring of the wavelength calibration lamps for the Hubble Space Telescope

Ilaria Pascucci, Charles Proffitt, Parviz Ghavamian, David Sahnow, Cristina Oliveira, Alessandra Aloisi, Tony Keyes, Steven Penton

Proceedings Volume 7731, 77313B (2010) https://doi.org/10.1117/12.857465

KEYWORDS: Lamps, Calibration, Spectrographs, Hubble Space Telescope, Sensors, Space telescopes, Ultraviolet radiation, Carbon monoxide, Visible radiation, Target acquisition

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Proceedings Article | 11 August 2010 Paper

ACCESS: design and preliminary performance

Mary Elizabeth Kaiser, Jeffrey Kruk, Stephan McCandliss, Bernard Rauscher, Randy Kimble, Russell Pelton, David Sahnow, W. Dixon, Paul Feldman, Bryan Gaither, Justin Lazear, H. Warren Moos, Adam Riess, Dominic Benford, Jonathan Gardner, Robert Hill, Duncan Kahle, D. Brent Mott, Augustyn Waczynski, Yiting Wen, Bruce Woodgate, Ralph Bohlin, Susana Deustua, Robert Kurucz, Michael Lampton, Saul Perlmutter, Edward Wright

Proceedings Volume 7731, 77313I (2010) https://doi.org/10.1117/12.857796

KEYWORDS: Sensors, Calibration, Telescopes, Stars, Standards development, Spectrographs, Mirrors, Rockets, Prisms, Reflectivity

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Proceedings Article | 30 July 2010 Paper

Hubble Space Telescope: Cosmic Origins Spectrograph FUV detector initial on-orbit performance

Jason McPhate, Oswald H. Siegmund, John Vallerga, David Sahnow, Thomas Ake, Steven Penton, Kevin France, Derck Massa, Steven Osterman, Stéphane Béland, Stephan McCandliss

Proceedings Volume 7732, 77322H (2010) https://doi.org/10.1117/12.858211

KEYWORDS: Sensors, Microchannel plates, Image segmentation, Signal to noise ratio, Hubble Space Telescope, Spectrographs, Spatial resolution, Carbon monoxide, Quantum efficiency, Stars

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Proceedings Article | 23 July 2008 Paper

The COS calibration pipeline and verification process

Mary Elizabeth Kaiser, Philip Hodge, Charles Keyes, David Sahnow, Thomas Ake, Alessandra Aloisi, Stephane Béland, Rosa Diaz, Scott Friedman, Cynthia Froning, Parviz Ghavamian, James Green, Jason McPhate, Cristina Oliveira, Steve Osterman, Steve Penton, Brittany Shaw, Erik Wilkinson

Proceedings Volume 7014, 70146G (2008) https://doi.org/10.1117/12.790239

KEYWORDS: Calibration, Sensors, Doppler effect, Switches, Space telescopes, Lamps, Spectral calibration, Data archive systems, Data conversion, Distortion

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Proceedings Article | 15 July 2008 Paper

Project Lyman

Stephan McCandliss, Jeffrey Kruk, William Blair, Mary Elizabeth Kaiser, Paul Feldman, Gerhardt Meurer, William Dixon, David Sahnow, David Neufeld, Roxana Lupu, Brian Fleming, Stephen Smee, B. Andersson, Samuel Moseley, Alexander Kutyrev, Mary Li, George Sonneborn, Oswald Siegmund, John Vallerga, Barry Welsh, Massimo Stiavelli, Rogier Windhorst, Alice Shapley

Proceedings Volume 7011, 701120 (2008) https://doi.org/10.1117/12.789574

KEYWORDS: Galactic astronomy, Camera shutters, Stars, Sensors, Photons, Telescopes, Near ultraviolet, Ionization, Spectroscopy, James Webb Space Telescope

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We explore the design of a space mission called Project Lyman that has the goal of quantifying the ionization history of the universe from the present epoch to a redshift of z ~ 3. Observations from WMAP and SDSS show that before a redshift of z (Symbol not available. See manuscript.) 6 the first collapsed objects, possibly dwarf galaxies, emitted Lyman continuum (LyC) radiation shortward of 912 Å that reionized most of the universe. Theoretical estimates of the LyC escape fraction ( f_esc ) required from these objects to complete reionization is f_esc~10%. How LyC escapes from galactic environments, whether it induces positive or negative feedback on the local and global collapse of structures, and the role played by clumping, molecules, metallicity and dust are major unanswered theoretical questions, requiring observational constraint. Numerous intervening Lyman limit systems frustrate the detection of LyC from high z objects. They thin below z ~ 3 where there are reportedly a few cases of apparently very high fesc. At low z there are only controversial detections and a handful of upper limits. A wide-field multi-object spectroscopic survey with moderate spectral and spatial resolution can quantify f_esc within diverse spatially resolved galactic environments over redshifts with significant evolution in galaxy assemblage and quasar activity. It can also calibrate LyC escape against Lyα escape, providing an essential tool to JWST for probing the beginnings of reionization. We present calculations showing the evolution of the characteristic apparent magnitude of star-forming galaxy luminosity functions at 900 Å, as a function of redshift and assumed escape fraction. These calculations allow us to determine the required aperture for detecting LyC and conduct trade studies to guide technology choices and balance science return against mission cost. Finally we review our efforts to build a pathfinding dual order multi-object spectro/telescope with a (0.5°)² field-of-view, using a GSFC microshutter array, and crossed delay-line micro-channel plate detector.

Proceedings Article | 11 July 2008 Paper

On-board calibration monitor for tracking instrument sensitivity

J. Kruk, M. Kaiser, S. McCandliss, J. Orndorff, R. Barkhouser, D. Sahnow, D. Benford, R. Bohlin, S. Deustua, W. Dixon, P. Feldman, J. Gardner, R. Kimble, R. Kurucz, M. Lampton, H. Moos, S. Perlmutter, B. Rauscher, A. Riess, B. Woodgate, E. Wright

Proceedings Volume 7014, 70145J (2008) https://doi.org/10.1117/12.790200

KEYWORDS: Light emitting diodes, Photodiodes, Telescopes, Calibration, Space telescopes, Light sources, Diffusers, Mirrors, Stars, Electronics

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Proceedings Article | 9 July 2008 Paper

ACCESS: absolute color calibration experiment for standard stars

Mary Elizabeth Kaiser, Jeffrey Kruk, Stephan McCandliss, David Sahnow, Bernard Rauscher, Dominic Benford, Ralph Bohlin, S. Deustua, W. Dixon, P. Feldman, J. Gardner, R. Kimble, R. Kurucz, M. Lampton, H. Moos, S. Perlmutter, A. Riess, B. Woodgate, E. Wright

Proceedings Volume 7014, 70145Y (2008) https://doi.org/10.1117/12.790106

KEYWORDS: Calibration, Stars, Sensors, Telescopes, Collimators, Spectrographs, Mirrors, Photodiodes, Near infrared, Atmospheric modeling

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Proceedings Article | 7 June 2006 Paper

Operations with the new FUSE Observatory: three-axis control with one reaction wheel

David Sahnow, Jeffrey Kruk, Thomas Ake, B-G Andersson, Alice Berman, William Blair, Robert Boyer, James Caplinger, Humberto Calvani, Thomas Civeit, W. Van Dyke Dixon, Martin England, Mary Elizabeth Kaiser, Mark Kochte, H. Warren Moos, Bryce Roberts

Proceedings Volume 6266, 626602 (2006) https://doi.org/10.1117/12.673408

KEYWORDS: Satellites, Magnetism, Gyroscopes, Space operations, Control systems, Observatories, Data archive systems, Sensors, Solids, Far ultraviolet

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Proceedings Article | 22 September 2005 Paper

Calibration of the New Horizons Long-Range Reconnaissance Imager

F. Morgan, S. Conard, H. Weaver, O. Barnouin-Jha, A. Cheng, H. Taylor, K. Cooper, R. Barkhouser, R. Boucarut, E. Darlington, M. Grey, I. Kuznetsov, T. Madison, M. Quijada, D. Sahnow, J. Stock

Proceedings Volume 5906, 59061E (2005) https://doi.org/10.1117/12.616880

KEYWORDS: Calibration, Charge-coupled devices, Sensors, Bandpass filters, Collimators, Photodiodes, Temperature metrology, Telescopes, Pluto, Imaging systems

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Proceedings Article | 11 October 2004 Paper

Long-term gain variation in the FUSE detectors

David Sahnow

Proceedings Volume 5488, (2004) https://doi.org/10.1117/12.551849

KEYWORDS: Sensors, Microchannel plates, Image segmentation, Lamps, Sensor performance, Electronics, Silicon carbide, Satellites, Line width roughness, Airglow

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Proceedings Article | 8 December 2003 Paper

Preliminary calibration results for the HST/cosmic origins spectrograph

Erik Wilkinson, Stephane Beland, Cynthia Froning, James Green, Steven Osterman, Steven Penton, Thomas Delker, Dennis Ebbets, Adrian Martin, Jason McPhate, John Vallerga, Scott Friedman, George Hartig, Charles Keyes, Claus Leitherer, Kenneth Sembach, David Sahnow

Proceedings Volume 5164, (2003) https://doi.org/10.1117/12.505870

KEYWORDS: Calibration, Sensors, Spectrographs, Cadmium sulfide, Spectral resolution, Lamps, Spatial resolution, Mirrors, Spectral calibration, Carbon monoxide

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Proceedings Article | 24 February 2003 Paper

The FUSE detectors: on-orbit use and lessons learned

David Sahnow

Proceedings Volume 4854, (2003) https://doi.org/10.1117/12.459777

KEYWORDS: Sensors, Microchannel plates, Calibration, Image segmentation, Electronics, Lamps, Quantum efficiency, Silicon carbide, Laser induced fluorescence, Sensor performance

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Proceedings Article | 10 December 2001 Paper

Algorithms for correcting geometric distortions in delay-line anodes

Erik Wilkinson, Steven Penton, Stephane Beland, John Vallerga, Jason McPhate, David Sahnow

Proceedings Volume 4498, (2001) https://doi.org/10.1117/12.450073

KEYWORDS: Sensors, Microchannel plates, Electronics, Analog electronics, Capacitors, Dielectrics, Signal detection, Hubble Space Telescope, Calibration, Dispersion

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Proceedings Article | 18 December 2000 Paper

Far Ultraviolet Spectroscopic Explorer: one year in orbit

David Sahnow, Henry Moos, Scott Friedman, William Blair, Steven Conard, Jeffrey Kruk, Edward Murphy, William Oegerle, Thomas Ake

Proceedings Volume 4139, (2000) https://doi.org/10.1117/12.410516

KEYWORDS: Satellites, Sensors, Calibration, Far ultraviolet, Mirrors, UV-Vis spectroscopy, Silicon carbide, Line width roughness, Satellite communications, Laser induced fluorescence

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Proceedings Article | 18 December 2000 Paper

On-orbit performance of the double delay line detectors for the Far Ultraviolet Spectroscopic Explorer

David Sahnow, Mark Gummin, Geoffrey Gaines, Alex Fullerton, Mary Elizabeth Kaiser, Oswald Siegmund

Proceedings Volume 4139, (2000) https://doi.org/10.1117/12.410518

KEYWORDS: Sensors, Microchannel plates, Electronics, Spectrographs, Far ultraviolet, Lamps, Quantum efficiency, Photons, UV-Vis spectroscopy, Spectroscopy

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Proceedings Article | 18 December 2000 Paper

Far Ultraviolet Spectroscopic Explorer optical system: lessons learned

Steven Conard, Robert Barkhouser, Jordan Evans, Scott Friedman, Jeffrey Kruk, Henry Moos, Raymond Ohl, David Sahnow

Proceedings Volume 4139, (2000) https://doi.org/10.1117/12.410522

KEYWORDS: Mirrors, Sensors, Optical testing, Spectrographs, Visible radiation, Satellites, Optical fabrication, Telescopes, Space telescopes, Optical alignment

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Proceedings Article | 28 July 2000 Paper

On-orbit performance of the Far Ultraviolet Spectroscopic Explorer (FUSE)

David Sahnow, Henry Moos, Thomas Ake, B. Andersson, Martial Andre, David Artis, Alice Berman, William Blair, Kenneth Brownsberger, Humberto Calvani, Pierre Chayer, Steven Conard, Paul Feldman, Scott Friedman, Alex Fullerton, Geoffrey Gaines, James Green, Mark Gummin, J. Joyce, Mary Elizabeth Kaiser, Jeffrey Kruk, Don Lindler, Derck Massa, Edward Murphy, William Oegerle, Raymond Ohl, Steven Osterman, Bryce Roberts, Katherine Roth, Ravi Sankrit, Kenneth Sembach, Robin Shelton, Oswald Siegmund, Harold Weaver, Erik Wilkinson

Proceedings Volume 4013, (2000) https://doi.org/10.1117/12.394015

KEYWORDS: Sensors, Mirrors, Satellites, Far ultraviolet, Silicon carbide, Spectrographs, Calibration, UV-Vis spectroscopy, Laser induced fluorescence, Line width roughness

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Proceedings Article | 22 October 1999 Paper

Prelaunch optical tests and performance estimates of the Far-Ultraviolet Spectroscopic Explorer (FUSE) satellite

Scott Friedman, Steven Conard, Robert Barkhouser, Kenneth Brownsberger, Alexandra Cha, Alex Fullerton, Jeffrey Kruk, Warren Moos, Edward Murphy, Raymond Ohl, David Sahnow, Harold Weaver

Proceedings Volume 3765, (1999) https://doi.org/10.1117/12.366525

KEYWORDS: Sensors, Satellites, Spectrographs, Mirrors, Lamps, Collimators, Stars, Far ultraviolet, Optical testing, Spectral resolution

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Proceedings Article | 22 October 1999 Paper

Processing and interpretation of preflight FUSE spectra

Alexandra Cha, David Sahnow, Henry Moos

Proceedings Volume 3765, (1999) https://doi.org/10.1117/12.366528

KEYWORDS: Sensors, Spectral resolution, Spectrographs, Calibration, Laser induced fluorescence, Image segmentation, Silicon carbide, Lamps, Monochromatic aberrations, Data processing

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Proceedings Article | 28 August 1998 Paper

Integration, alignment, and initial performance results of the Far Ultraviolet Spectroscopic Explorer (FUSE) spectrograph

Erik Wilkinson, James Green, Steven Osterman, Kenneth Brownsberger, David Sahnow

Proceedings Volume 3356, (1998) https://doi.org/10.1117/12.324431

KEYWORDS: Sensors, Spectrographs, Telescopes, Laser induced fluorescence, Mirrors, Far ultraviolet, Optical alignment, Light scattering, Silicon carbide, Staring arrays

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Proceedings Article | 28 August 1998 Paper

Two-dimensional simulation of Far-Ultraviolet Spectroscopic Explorer (FUSE) spectra

David Sahnow

Proceedings Volume 3356, (1998) https://doi.org/10.1117/12.324430

KEYWORDS: Sensors, Point spread functions, Absorption, Computer simulations, Data modeling, Silicon carbide, Spectroscopy, Astronomy, Optical design, Image segmentation

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Proceedings Article | 28 August 1998 Paper

Preliminary performance estimates for the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite

David Sahnow, Scott Friedman, Henry Moos, James Green, Oswald Siegmund

Proceedings Volume 3356, (1998) https://doi.org/10.1117/12.324476

KEYWORDS: Sensors, Space operations, Mirrors, Spectrographs, Satellites, Spectral resolution, Microchannel plates, Far ultraviolet, Space telescopes, UV-Vis spectroscopy

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Proceedings Article | 1 November 1996 Paper

Optical performance budget for the Far Ultraviolet Spectroscopic Explorer

David Sahnow, Cathleen VanDyke, Qian Gong, James Bremer, Michael Kennedy

Proceedings Volume 2863, (1996) https://doi.org/10.1117/12.256237

KEYWORDS: Mirrors, Sensors, Telescopes, Space telescopes, Space operations, Spectrographs, Optical components, Error analysis, Far ultraviolet, UV-Vis spectroscopy

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Proceedings Article | 12 October 1996 Paper

Design and predicted performance of the Far Ultraviolet Spectroscopic Explorer

David Sahnow, Scott Friedman, William Oegerle, Henry Moos, James Green, Oswald Siegmund

Proceedings Volume 2807, (1996) https://doi.org/10.1117/12.255092

KEYWORDS: Sensors, Space operations, Satellites, Mirrors, Spectrographs, Silicon carbide, Laser induced fluorescence, Far ultraviolet, UV-Vis spectroscopy, Telescopes

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Proceedings Article | 7 November 1994 Paper

Tolerance analysis of the Far Ultraviolet Spectroscopic Explorer (FUSE): a statistical approach

Erik Wilkinson, James Green, David Sahnow

Proceedings Volume 2283, (1994) https://doi.org/10.1117/12.193193

KEYWORDS: Error analysis, Tolerancing, Spectrographs, Far ultraviolet, Optical alignment, UV-Vis spectroscopy, Data modeling, Spectroscopy, Computer simulations, Spectroscopes

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Proceedings Article | 7 November 1994 Paper

Analysis and design of telescopes for the Far Ultraviolet Spectroscopic Explorer

Scott Friedman, Steven Conard, David Sahnow, Douglas McGuffey

Proceedings Volume 2283, (1994) https://doi.org/10.1117/12.193198

KEYWORDS: Mirrors, Silicon carbide, Telescopes, Reflectivity, Actuators, Chemical vapor deposition, Zerodur, Far ultraviolet, Sensors, UV-Vis spectroscopy

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Proceedings Article | 1 November 1993 Paper

FUSE microchannel plate detectors: models and data for resolution at the pore limit

David Sahnow, Charles Bowers, Oswald Siegmund, Joseph Stock, Mark Gummin

Proceedings Volume 1945, (1993) https://doi.org/10.1117/12.158783

KEYWORDS: Sensors, Microchannel plates, Data modeling, Spectrographs, Image resolution, Computer simulations, Optical components, Telescopes, Dispersion, Far ultraviolet

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