Dr. Raymond G. Ohl Profile

Dr. Raymond G. Ohl

Optical Physicist at NASA Goddard Space Flight Ctr

SPIE Involvement:

Conference Program Committee | Author

Publications (62)

Proceedings Article | 3 October 2022 Paper

Surface damage catalog for contact-measuring space flight optics using a coordinate measuring machine

Joshua Berrier, Timothy Hahn, David Kubalak, S. Bradley Cenko, Javier Del Hoyo, Severine Tournois, Raymond Ohl

Proceedings Volume 12222, 1222202 (2022) https://doi.org/10.1117/12.2632807

KEYWORDS: Coating, Inspection, Space operations

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SPIE Journal Paper | 17 August 2021

Measuring large amplitude surface figure error using coordinate metrology

Manal Khreishi, Raymond Ohl, Ryan McClelland, Ron Shiri, Tilak Hewagama, Shahid Aslam, Melville Ulmer, Edgar Canavan, Rongguang Liang

OE, Vol. 60, Issue 08, 084103, (August 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.8.084103

KEYWORDS: Metrology, Mirrors, X-ray optics, Optical engineering, Silicon, Optical testing, Semiconducting wafers, Optical fabrication, Photovoltaics, Interferometry

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SPIE Journal Paper | 10 April 2021 Open Access

Enabling precision coordinate metrology for universal optical testing and alignment applications (Erratum)

Manal Khreishi, Raymond Ohl, Joseph Howard, Jonathan Papa, Ryan McClelland, Clark Hovis, Theodore Hadjimichael, Patrick Thompson, Kenneth Ranson, Rongguang Liang, Nicolas Gorius

OE, Vol. 60, Issue 04, 049801, (April 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.4.049801

KEYWORDS: Optical testing, Optical alignment, Metrology, Optical engineering, Geometrical optics

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SPIE Journal Paper | 15 March 2021

Enabling precision coordinate metrology for universal optical testing and alignment applications

Manal Khreishi, Raymond Ohl, Joseph Howard, Jonathan Papa, Ryan McClelland, Clark Hovis, Theodore Hadjimichael, Patrick Thompson, Kenneth Ranson, Rongguang Liang, Nicolas Gorius

OE, Vol. 60, Issue 03, 035106, (March 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.3.035106

KEYWORDS: Metrology, Mirrors, Optical testing, Optical alignment, Optical engineering, Interferometry, Optical fabrication, Aspheric lenses, Terbium, Lawrencium

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Proceedings Article | 25 September 2017 Open Access

Fine guidance sensor/near-infrared imager and slitless spectrograph on James Webb Space Telescope: pupil alignment methodology and metrology

M. Maszkiewicz, N. Rowlands, D. Aldridge, A. Beaton, S. Delamer, Sheng-Hai Zheng, R. Ohl, P. Coulter

Proceedings Volume 10562, 1056223 (2017) https://doi.org/10.1117/12.2296043

KEYWORDS: Mirrors, Error analysis, Sensors, James Webb Space Telescope, Readout integrated circuits, Interfaces, Received signal strength, Optical alignment, Astronomical imaging, Metrology

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Proceedings Article | 22 August 2017 Paper

Metrology for trending alignment of the James Webb Space Telescope before and after ambient environmental testing

Theo Hadjimichael, Raymond Ohl, Josh Berrier, Jeff Gum, Joseph Hayden, Manal Khreishi, Kyle McLean, Kevin Redman, Joseph Sullivan, Greg Wenzel, William Eichhorn, Jerrod Young

Proceedings Volume 10377, 103770I (2017) https://doi.org/10.1117/12.2273991

KEYWORDS: James Webb Space Telescope, Metrology, Space telescopes, Mirrors, Optical alignment, Telescopes, Infrared telescopes, Optical components, Optical fabrication, Astronomical telescopes

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Proceedings Article | 22 August 2017 Paper

Alignment and testing of critical interface fixtures for the James Webb Space Telescope

Kyle McLean, Paul Bagdanove, Joshua Berrier, Emmanuel Cofie, Tiffany Glassman, Theodore Hadjimichael, Eric Johnson, Joshua Levi, Amy Lo, Joseph McMann, Raymond Ohl, Dean Osgood, James Parker, Kevin Redman, Vicki Roberts, Matthew Stephens, Adam Sutton, Greg Wenzel, Jerrod Young

Proceedings Volume 10377, 103770H (2017) https://doi.org/10.1117/12.2272790

KEYWORDS: James Webb Space Telescope, Observatories, Optical alignment, Metrology, Space telescopes, Infrared telescopes, Astronomical telescopes, Telescopes

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Proceedings Article | 20 October 2016 Presentation + Paper

A toolbox of metrology-based techniques for optical system alignment

Phillip Coulter, Raymond Ohl, Peter Blake, Brent Bos, Victor Chambers, William Eichhorn, Jeffrey Gum, Theodore Hadjimichael, John Hagopian, Joseph Hayden, Samuel Hetherington, David Kubalak, Kyle Mclean, Joseph McMann, Kevin Redman, Henry Sampler, Greg Wenzel, Jerrod Young

Proceedings Volume 9951, 995108 (2016) https://doi.org/10.1117/12.2239070

KEYWORDS: Optical alignment, Metrology, Optical components, James Webb Space Telescope, Mirrors, Telescopes, Lawrencium, Sensors, Spherical lenses, Optical benches

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Proceedings Article | 18 October 2016 Paper

Alignment of the James Webb Space Telescope Integrated Science Instrument Module Element

Theo Hadjimichael, Raymond Ohl, Scott Antonille, David Aronstein, Andrew Bartoszyk, Josh Berrier, Emmanuel Cofie, Phil Coulter, Renee Gracey, Joseph Hayden, Joseph Howard, Jason Hylan, David Kubalak, Kyle McLean, Cherie Miskey, Kevin Redman, Scott Rohrbach, Derek Sabatke, Randal Telfer, Greg Wenzel, Thomas Zielinski, Joseph Sullivan, George Hartig, William Eichhorn

Proceedings Volume 9951, 99510C (2016) https://doi.org/10.1117/12.2238829

KEYWORDS: Optical alignment, James Webb Space Telescope, Cryogenics, Metrology, Virtual colonoscopy, Interfaces, Calibration, Computer aided design, Mirrors, Finite element methods

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Proceedings Article | 27 September 2016 Paper

Cryogenic optical test planning using the Optical Telescope Element Simulator with the James Webb Space Telescope Integrated Science Instrument Module

Timothy Reichard, Nicholas Bond, Bradford Greeley, Eliot Malumuth, Marcio Melendez, Ron Shiri, Catarina Alves de Oliveira, Scott Antonille, Stephan Birkmann, Clinton Davis, William Dixon, André Martel, Cherie Miskey, Raymond Ohl, Derek Sabatke, Joseph Sullivan

Proceedings Volume 9951, 99510N (2016) https://doi.org/10.1117/12.2237006

KEYWORDS: James Webb Space Telescope, Cryogenics, Space telescopes, Optical testing, Optical components, Sensors, Signal attenuation, Lamps, Tungsten, Calibration

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Proceedings Article | 27 September 2016 Paper

JWST science instrument pupil alignment measurements

Dave Kubalak, Joe Sullivan, Ray Ohl, Scott Antonille, Alexander Beaton, Phillip Coulter, George Hartig, Doug Kelly, David Lee, Michael Maszkiewicz, Paul Schweiger, Randal Telfer, Maurice Te Plate, Martyn Wells

Proceedings Volume 9951, 99510D (2016) https://doi.org/10.1117/12.2238830

KEYWORDS: James Webb Space Telescope, Cryogenics, Space telescopes, Optical components, Device simulation, Telescopes, Sensors, Aerospace engineering, Silicon, Calibration

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Proceedings Article | 27 September 2016 Presentation + Paper

JWST’s optical telescope simulator for verification of the Integrated Science Instrument Module

Joseph Sullivan, William Eichhorn, Derek Sabatke, Clinton Davis, Jenny Chu, Severine Tournois, David Kubalak, Bradford Greeley, Randy Kimble, Randal Telfer, George Hartig, Raymond Ohl, Jeffrey Kirk, Robert von Handorf, Erin Wolf, William Chang

Proceedings Volume 9951, 99510E (2016) https://doi.org/10.1117/12.2237834

KEYWORDS: James Webb Space Telescope, Cryogenics, Optical alignment, Device simulation, Calibration, Mirrors, Sensors, Silicon, Cameras, Monochromatic aberrations

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Proceedings Article | 27 September 2016 Presentation + Paper

Optical testing and verification methods for the James Webb Space Telescope Integrated Science Instrument Module element

Scott Antonille, Cherie Miskey, Raymond Ohl, Scott Rohrbach, David Aronstein, Andrew Bartoszyk, Charles Bowers, Emmanuel Cofie, Nicholas Collins, Brian Comber, William Eichhorn, Alistair Glasse, Renee Gracey, George Hartig, Joseph Howard, Douglas Kelly, Randy Kimble, Jeffrey Kirk, David Kubalak, Wayne Landsman, Don Lindler, Eliot Malumuth, Michael Maszkiewicz, Marcia Rieke, Neil Rowlands, Derek Sabatke, Corbett Smith, J. Scott Smith, Joseph Sullivan, Randal Telfer, Maurice Te Plate, M. Begoña Vila, Gerry Warner, David Wright, Raymond Wright, Julia Zhou, Thomas Zielinski

Proceedings Volume 9951, 995105 (2016) https://doi.org/10.1117/12.2238838

KEYWORDS: James Webb Space Telescope, Optical components, Space telescopes, Optical testing, Sensors, Calibration, Data modeling, Human-machine interfaces, Error analysis, Analytical research

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Proceedings Article | 10 August 2016 Paper

Structural, thermal, and optical performance (STOP) modeling and results for the James Webb Space Telescope integrated science instrument module

Renee Gracey, Andrew Bartoszyk, Emmanuel Cofie, Brian Comber, George Hartig, Joseph Howard, Derek Sabatke, Greg Wenzel, Raymond Ohl

Proceedings Volume 9911, 99111A (2016) https://doi.org/10.1117/12.2233641

KEYWORDS: Thermal modeling, Performance modeling, James Webb Space Telescope, Thermography, Instrument modeling, Systems modeling, Motion models, Temperature metrology, Finite element methods, Error analysis

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Proceedings Article | 29 July 2016 Paper

Cryo-vacuum testing of the JWST Integrated Science Instrument Module

Randy Kimble, M. Begoña Vila, Julie Van Campen, Stephan Birkmann, Brian Comber, Curtis Fatig, Alistair C. Glasse, Stuart Glazer, Douglas Kelly, Steven Mann, André Martel, Kevin Novo-Gradac, Ray Ohl, Konstantin Penanen, Scott Rohrbach, Joseph Sullivan, Dean Zak, Julia Zhou

Proceedings Volume 9904, 990408 (2016) https://doi.org/10.1117/12.2231554

KEYWORDS: James Webb Space Telescope, Space telescopes, Calibration, Observatories, Silicon, Sensors, Telescopes, Electronics, Mirrors, Optical alignment

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Proceedings Article | 8 September 2014 Paper

Ambient optomechanical alignment and pupil metrology for the flight instruments aboard the James Webb Space Telescope

Phillip Coulter, Alexander Beaton, Jeffery Gum, Theodore Hadjimichael, Joseph Hayden, Susann Hummel, Jason Hylan, David Lee, Timothy Madison, Michael Maszkiewicz, Kyle Mclean, Joseph McMann, Markus Melf, Linda Miner, Raymond Ohl, Kevin Redman, Andreas Roedel, Paul Schweiger, Maurice Te Plate, Martyn Wells, Greg Wenzel, Patrick Williams, Jerrod Young

Proceedings Volume 9195, 91950G (2014) https://doi.org/10.1117/12.2065017

KEYWORDS: Lawrencium, Silicon, Optical alignment, Virtual colonoscopy, James Webb Space Telescope, Metrology, Space telescopes, Telescopes, Finite element methods, Mirrors

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Proceedings Article | 21 September 2012 Paper

Global alignment optimization strategies, procedures, and tools for the James Webb Space Telescope (JWST) Integrated Science Instrument Module (ISIM)

Brent Bos, Joseph Howard, Philip Young, Renee Gracey, Lenward Seals, Raymond Ohl

Proceedings Volume 8442, 84423I (2012) https://doi.org/10.1117/12.926365

KEYWORDS: Optical alignment, James Webb Space Telescope, Optimization (mathematics), Optical components, Instrument modeling, Ray tracing, Chemical elements, Geometrical optics, Mirrors, Interfaces

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Proceedings Article | 21 September 2012 Paper

Status of the James Webb Space Telescope integrated science instrument module

Ray Lundquist, Vicki Balzano, Pam Davila, Michael Drury, Jamie Dunn, Stuart Glazer, Matthew Greenhouse, Ed Greville, Gregory Henegar, Eric Johnson, John McCloskey, Raymond Ohl, Robert Rashford, Gurnie Hobbs, Scott Lambros, Doug McGuffey, Mark Voyton

Proceedings Volume 8442, 84422M (2012) https://doi.org/10.1117/12.925515

KEYWORDS: Interfaces, James Webb Space Telescope, Sensors, Cryogenics, Electronics, Optical fabrication, Metrology, Space telescopes, Spectral resolution, Calibration

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Proceedings Article | 29 September 2011 Paper

Cryogenic thermal distortion performance characterization for the JWST ISIM structure

John Johnston, Emmanuel Cofie, Jason Hylan, Raymond Ohl, Maria Nowak, Douglas McGuffey, James Pontius, Eric Johnson

Proceedings Volume 8150, 815009 (2011) https://doi.org/10.1117/12.893932

KEYWORDS: Distortion, Cryogenics, Motion measurement, Metrology, James Webb Space Telescope, Photogrammetry, Kinematics, Motion models, Thermal modeling, Space telescopes

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Proceedings Article | 15 September 2011 Paper

Status of the James Webb Space Telescope integrated science instrument module system

Matthew Greenhouse, Vicki Balzano, Pamela Davila, Michael Drury, Jamie Dunn, Stuart Glazer, Ed Greville, Gregory Henegar, Eric Johnson, Ray Lundquist, John McCloskey, Raymond Ohl, Robert Rashford, Mark Voyton

Proceedings Volume 8146, 814606 (2011) https://doi.org/10.1117/12.895228

KEYWORDS: Cryogenics, Interfaces, James Webb Space Telescope, Space telescopes, Sensors, Data acquisition, Telescopes, Composites, Space operations, Image processing

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Proceedings Article | 13 September 2011 Paper

Lidar metrology for prescription characterization and alignment of large mirrors

B. Eegholm, W. Eichhorn, R. von Handorf, J. Hayden, R. Ohl, G. Wenzel

Proceedings Volume 8131, 81310I (2011) https://doi.org/10.1117/12.895012

KEYWORDS: Mirrors, Lawrencium, LIDAR, Spherical lenses, Signal detection, Metrology, Optical testing, Sensors, Optical alignment, James Webb Space Telescope

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Proceedings Article | 13 September 2011 Paper

Pupil alignment considerations for large deployable space telescopes

Brent Bos, Raymond Ohl, David Kubalak

Proceedings Volume 8131, 81310J (2011) https://doi.org/10.1117/12.894674

KEYWORDS: James Webb Space Telescope, Sensors, Observatories, Mirrors, Stray light, Space telescopes, Optical alignment, Vignetting, Imaging systems, Image quality

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Proceedings Article | 3 September 2010 Paper

Cryogenic performance of a high precision photogrammetry system for verification of the James Webb Space Telescope Integrated Science Instrument Module and associated ground support equipment structural alignment requirements

Maria Nowak, Paul Cleveland, Emmanuel Cofie, J. Allen Crane, Pamela Davila, Bente Eegholm, Randolph Hammond, James Heaney, Jason Hylan, John Johnston, Raymond Ohl, Joseph Orndorff, Dean Osgood, Kevin Redman, Henry Sampler, Stephen Smee, Joseph Stock, Felix Threat, Robert Woodruff, Philip Young

Proceedings Volume 7793, 77930A (2010) https://doi.org/10.1117/12.862595

KEYWORDS: Cryogenics, Photogrammetry, Metrology, James Webb Space Telescope, Optical alignment, Interfaces, Cameras, Space telescopes, Optical components, Observatories

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Proceedings Article | 3 September 2010 Paper

Cryogenic metrology for the James Webb Space Telescope Integrated Science Instrument Module alignment target fixtures using laser radar through a chamber window

T. Hadjimichael, D. Kubalak, A. Slotwinski, P. Davila, B. Eegholm, W. Eichhorn, J. Hayden, E. Mentzell, R. Ohl, G. Scharfstein, R. Telfer

Proceedings Volume 7793, 77930B (2010) https://doi.org/10.1117/12.862693

KEYWORDS: Lawrencium, Cryogenics, Metrology, James Webb Space Telescope, LIDAR, Aluminum, Optical alignment, Temperature metrology, Calibration, Atmospheric modeling

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Proceedings Article | 11 August 2010 Paper

Manufacturing and integration status of the JWST OSIM optical simulator

Joe Sullivan, Bill Eichhorn, Rob von Handorf, Derek Sabatke, Nick Barr, Rich Nyquist, Bob Pederson, Rick Bennnett, Paul Volmer, Dave Happs, Adrian Nagle, Rick Ortiz, Tony Kouri, Paul Hauser, Jon Seerveld, Dave Kubalak, Brad Greeley, Claef Hakun, Doug Leviton, Qian Gong, Pam Davila, Ray Ohl, Jeff Kirk, Clint Davis, Jenny Chu, Erin Wilson, Bill Chang, Steve Mann, Robert Rashford, Corbett Smith

Proceedings Volume 7731, 77313V (2010) https://doi.org/10.1117/12.856758

KEYWORDS: Mirrors, Optical fibers, Sensors, James Webb Space Telescope, ZBLAN, Optics manufacturing, Optical alignment, Calibration, Light emitting diodes, Integrated optics

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Proceedings Article | 5 August 2010 Paper

Status of the James Webb Space Telescope integrated science instrument module system

Matthew Greenhouse, Michael Drury, Jamie Dunn, Stuart Glazer, Ed Greville, Gregory Henegar, Eric Johnson, Ray Lundquist, John McCloskey, Raymond Ohl, Robert Rashford, Mark Voyton

Proceedings Volume 7731, 773108 (2010) https://doi.org/10.1117/12.856293

KEYWORDS: Cryogenics, James Webb Space Telescope, Interfaces, Sensors, Space telescopes, Telescopes, Data acquisition, Space operations, Composites, Image processing

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Proceedings Article | 29 August 2009 Paper

Pupil alignment reference (PAR) for the Mid-Infrared Instrument (MIRI) for optical alignment and verification on the Integrated Science Instrument Module (ISIM) in James Webb Space Telescope (JWST)

Cagatay Aymergen, Phillip Driggers, Raymond Ohl, Ray Lundquist, Pam Davila, Brent Bos, Scott Antonille, David Kubalak, Suong Le, Leonard Hanssen, Vilem Mikula, Claef Hakun, Corina Guishard, Jeffrey Guzek, Joe Connelly, Joseph McMann

Proceedings Volume 7433, 74330P (2009) https://doi.org/10.1117/12.826286

KEYWORDS: James Webb Space Telescope, Optical alignment, Interfaces, Cryogenics, Bidirectional reflectance transmission function, Inspection, Space telescopes, Reflectivity, Mirrors, Telescopes

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Proceedings Article | 22 August 2009 Paper

Updates to the optical alignment and test plan for the James Webb Space Telescope integrated science instrument module

R. Ohl

Proceedings Volume 7433, 743305 (2009) https://doi.org/10.1117/12.828584

KEYWORDS: Optical alignment, James Webb Space Telescope, Calibration, Cryogenics, Interfaces, Metrology, Space telescopes, Mirrors, Telescopes, Aerospace engineering

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Proceedings Article | 22 August 2009 Paper

Trades for ambient non-contact metrology

R. Ohl, B. Hoffmann Eegholm, M. Casas, B. Frey, M. Dominguez, J. Gill, J. Hayden, P. Morken, K. Redman, V. Roberts, B. Saif, T. Scirpo

Proceedings Volume 7433, 743306 (2009) https://doi.org/10.1117/12.831303

KEYWORDS: Mirrors, Lawrencium, James Webb Space Telescope, Metrology, LIDAR, Cryogenics, Space telescopes, Glasses, Composites, Optical testing

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Proceedings Article | 2 September 2008 Paper

Optical metrology and alignment of the James Webb Space Telescope Integrated Science Instrument Module

Joseph Connelly, Brent Bos, Pamela Davila, William Eichhorn, Bradley Frey, John Hagopian, Jason Hylan, James Marsh, Douglas McGuffey, Joseph McMann, Maria Nowak, Raymond Ohl, Kevin Redman, Derek Sabatke, Henry Sampler, Joseph Stock, Joseph Sullivan, Gregory Wenzel, Geraldine Wright, Philip Young

Proceedings Volume 7068, 70680F (2008) https://doi.org/10.1117/12.798778

KEYWORDS: Interfaces, Optical alignment, James Webb Space Telescope, Metrology, Cryogenics, Mirrors, Photogrammetry, Optical components, Cameras, Optical tracking

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Proceedings Article | 2 September 2008 Paper

Verification of the James Webb Space Telescope Integrated Science Instrument Module cryogenic structural alignment requirements via photogrammetry

Maria Nowak, Paul Cleveland, Allen Crane, Pamela Davila, Acey Herrera, Jason Hylan, Andrew Liehr, James Marsh, Raymond Ohl, Kevin Redman, Henry Sampler, Joseph Stock, Greg Wenzel, Robert Woodruff, Philip Young

Proceedings Volume 7068, 70680Q (2008) https://doi.org/10.1117/12.798791

KEYWORDS: Cameras, Cryogenics, Photogrammetry, James Webb Space Telescope, Distortion, Error analysis, Metrology, Calibration, Received signal strength, Optical alignment

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Proceedings Article | 12 July 2008 Paper

Cryogenic pupil alignment test architecture for the James Webb Space Telescope integrated science instrument module

Brent Bos, David Kubalak, Scott Antonille, Raymond Ohl, John Hagopian, Pamela Davila, Joseph Sullivan, Michael Sánchez, Derek Sabatke, Robert Woodruff, Maurice te Plate, Clinton Evans, Victor Isbrucker, Stephen Somerstein, Martyn Wells, Samuel Ronayette

Proceedings Volume 7010, 70103C (2008) https://doi.org/10.1117/12.789808

KEYWORDS: James Webb Space Telescope, Mirrors, Sensors, Observatories, Optical components, Reflectivity, Cryogenics, Stray light, Beam splitters, Infrared telescopes

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Proceedings Article | 1 October 2007 Paper

Photogrammetric metrology for the James Webb Space Telescope integrated science instrument module

Maria Nowak, Allen Crane, Pamela Davila, William Eichhorn, James Gill, Acey Herrera, Michael Hill, Jason Hylan, Mark Jetten, James Marsh, Raymond Ohl, Robert Quigley, Kevin Redman, Henry Sampler, Geraldine Wright, Philip Young

Proceedings Volume 6692, 66920P (2007) https://doi.org/10.1117/12.733896

KEYWORDS: Photogrammetry, Nondestructive evaluation, Cameras, Metrology, James Webb Space Telescope, Cryogenics, Temperature metrology, Optical alignment, Space telescopes, Interfaces

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Proceedings Article | 21 September 2007 Paper

A scanning Hartmann focus test for the EUVI telescopes aboard STEREO

R. Ohl, S. Antonille, D. Aronstein, B. Dean, M. Delmont, J. d'Entremont, W. Eichhorn, B. Frey, S. Hynes, D. Janssen, D. Kubalak, K. Redman, R. Shiri, J. Smith, P. Thompson, M. Wilson

Proceedings Volume 6676, 66760G (2007) https://doi.org/10.1117/12.734655

KEYWORDS: Collimators, Telescopes, Space telescopes, Mirrors, Error analysis, Sensors, Ultraviolet radiation, Eye, Interferometers, Mendelevium

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Proceedings Article | 17 September 2007 Paper

Optical alignment of the JWST ISIM to the OTE simulator (OSIM): current concept and design studies

Bradley Frey, Pamela Davila, John Hagopian, James Marsh, Raymond Ohl, Mark Wilson, Philip Young

Proceedings Volume 6692, 66920R (2007) https://doi.org/10.1117/12.736050

KEYWORDS: James Webb Space Telescope, Optical alignment, Cryogenics, Optical cryogenics, Space telescopes, Aerospace engineering, Space operations, Optical telescopes, Optical components, Device simulation

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Proceedings Article | 7 July 2006 Paper

Methods for correlating autocollimation of theodolites and coordinate metrology in spacecraft systems

Carlos Aviado, James Gill, Kevin Redman, Raymond Ohl

Proceedings Volume 6273, 62733H (2006) https://doi.org/10.1117/12.670043

KEYWORDS: Space operations, Autocollimation, Metrology, Photogrammetry, Calibration, Transform theory, Aerospace engineering, Cameras, Laser metrology, Optical testing

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This paper will discuss the details of the metrology associated with the integration and testing of spacecraft systems and scientific instruments at the NASA Goddard Space Flight Center (NASA GSFC). Specifically, this paper will outline the process for correlating theodolite autocollimation measurements with theodolite coordinate triangulation measurements, laser tracker coordinate measurements, photogrammetry camera system, and other coordinate measurement techniques. For theodolite autocollimation data, NASA GSFC developed a Microsoft Excel-based spreadsheet program to calculate the transformation matrices from reference cube pointing directions into spacecraft coordinates defined by physical features. The autocollimated image return from the mirrored faces of the reference cubes are measured relative to each other and define unit vectors that point in the direction perpendicular to the cube face surface. The roll, zenith, pitch, and yaw are calculated from the direction cosines of the unit vectors that define the directional pointing rotations around coordinate axes. The theodolite-based pointing vectors are then transformed to the spacecraft coordinate system. The Brunson Spatial Analyzer^TM coordinate measuring software program is used to analyze data from theodolites using triangulation on target positions, a laser tracker coordinate measuring system, a photogrammetry system or any other coordinate measuring system. All the coordinate data is tied into theodolite coordinate data by measuring common targets. To correlate theodolite autocollimation on cube faces to the point coordinate location data, one must first measure the test object with the Spatial Analyzer^TM theodolite triangulation coordinate system. From coordinate features, a spacecraft coordinate system is defined by the blueprint design. One of the Spatial Analyzer^TM theodolites is used as the primary reference for the auto-collimation measurements. This ties together the coordinate target point locations to the pointing directions of mirrored surfaces of cubes.

Proceedings Article | 7 July 2006 Paper

Theoferometer for the construction of precision optomechanical assemblies

Ashley Korzun, Ronald Toland, Raymond Ohl, Vincent Holmes, Louis Worrel

Proceedings Volume 6273, 627326 (2006) https://doi.org/10.1117/12.671326

KEYWORDS: Prototyping, Metrology, Fringe analysis, Computer programming, Mercury, Optical alignment, Mirrors, Charge-coupled devices, Spatial frequencies, Photomasks

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Proceedings Article | 28 June 2006 Paper

Commissioning of the IRMOS MEMS spectrometer

John MacKenty, Raymond Ohl, Matthew Greenhouse, Richard Green

Proceedings Volume 6269, 626915 (2006) https://doi.org/10.1117/12.672317

KEYWORDS: Digital micromirror devices, Mirrors, Sensors, Calibration, Microelectromechanical systems, Spectroscopy, Stars, Space telescopes, K band, Telescopes

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Proceedings Article | 5 October 2005 Paper

Integration and verification of the Terrestrial Planet Finder coronagraphic observatory

Andrew Smith, Carl Blaurock, Michael Krim, Marie Levine, Alice Liu, Anthony Martino, Raymond Ohl, Joseph Pitman

Proceedings Volume 5905, 59051C (2005) https://doi.org/10.1117/12.615707

KEYWORDS: Mirrors, Coronagraphy, Telescopes, Phase modulation, Observatories, Planets, Space telescopes, Shape memory alloys, Deformable mirrors, Wavefronts

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Proceedings Article | 31 August 2005 Paper

Optical design considerations for the Terrestrial Planet Finder–Coronagraph mission: optical telescope assembly

Joseph Howard, Pantazis Mouroulis, Anita Thompson, Andrew Smith, David Content, Timothy Ho, Clifton Jackson, Raymond Ohl, Stuart Shaklan

Proceedings Volume 5874, 58740I (2005) https://doi.org/10.1117/12.618380

KEYWORDS: Mirrors, Telescopes, Planets, Stars, Coronagraphy, Optical instrument design, Phase modulation, Wavefronts, Optical design, Exoplanets

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Proceedings Article | 30 August 2005 Paper

Engineering trade studies for the Terrestrial Planet Finder Coronagraph primary mirror

David Content, Raymond Ohl, Terry Cafferty, Eri Cohen, Robert Egerman, Charles Engler, Louis Fantano, Peter Feher, Joseph Green, Timothy Ho, Joseph Howard, Sarah Hunyadi, Sandra Irish, Cliffton Jackson, Andrew Kissil, Eug-Yun Kwack, Neil Martin, Anthony Martino, Jeff Pattison, Sharon Peabody, Andrew Smith, Ichung Weng

Proceedings Volume 5867, 58670X (2005) https://doi.org/10.1117/12.618687

KEYWORDS: Mirrors, Coronagraphy, Thermal modeling, Planets, Computer aided design, Zerodur, Phase modulation, Observatories, Packaging, Space telescopes

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Proceedings Article | 30 September 2004 Paper

Integration, testing, and performance of the Infrared Multi-Object Spectrometer

Raymond Ohl, Joseph Connelly, Robert Boyle, Rebecca Derro, Danette Fitzgerald, Matthew Greenhouse, Timothy Madison, John Mentzell, Brian Nord, Leroy Sparr, Jason Hylan, Knute Ray, John MacKenty

Proceedings Volume 5492, (2004) https://doi.org/10.1117/12.551494

KEYWORDS: Mirrors, Telescopes, Digital micromirror devices, Optical alignment, Infrared spectroscopy, Optical design, Point spread functions, Spectroscopy, Space telescopes, James Webb Space Telescope

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Proceedings Article | 30 September 2004 Paper

Design and performance of a MEMS-based infrared multi-object spectrometer

John MacKenty, Richard Green, Matthew Greenhouse, Raymond Ohl

Proceedings Volume 5492, (2004) https://doi.org/10.1117/12.551913

KEYWORDS: Digital micromirror devices, Mirrors, Sensors, Telescopes, Infrared spectroscopy, Spectroscopy, Space telescopes, Astronomical imaging, Micromirrors, James Webb Space Telescope

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Proceedings Article | 24 September 2004 Paper

Highlights of the ASPE 2004 Winter Topical Meeting on Free-Form Optics: Design, Fabrication, Metrology, Assembly

Raymond Ohl, Thomas Dow, Alex Sohn, Kenneth Garrard

Proceedings Volume 5494, (2004) https://doi.org/10.1117/12.551469

KEYWORDS: Freeform optics, Optical design, Metrology, Mirrors, Astronomical imaging, Space telescopes, Aspheric optics, X-ray optics, James Webb Space Telescope, Infrared spectroscopy

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Proceedings Article | 15 October 2003 Paper

Alignment and performance of the Infrared Multi-Object Spectrometer

Joseph Connelly, Raymond Ohl, J. Mentzell, Timothy Madison, Jason Hylan, Ronald Mink, Timo Saha, June Tveekrem, Leroy Sparr, Victor Chambers, Danette Fitzgerald, Matthew Greenhouse, John MacKenty

Proceedings Volume 5172, (2003) https://doi.org/10.1117/12.503984

KEYWORDS: Mirrors, Telescopes, Sensors, Space telescopes, Infrared spectroscopy, Infrared radiation, Point spread functions, Spectroscopy, Optical alignment, Infrared imaging

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Proceedings Article | 15 October 2003 Paper

Lessons learned from the design, fabrication, integration, and test of a cryogenic IR spectrometer for ground-based astronomy

Jason Hylan, Leroy Sparr, Raymond Ohl, John Mentzell, Matthew Greenhouse, John MacKenty

Proceedings Volume 5172, (2003) https://doi.org/10.1117/12.506082

KEYWORDS: Mirrors, Telescopes, Optical components, Cryogenics, Infrared spectroscopy, Space telescopes, Optical benches, Optical design, Microelectromechanical systems, Sensors

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Proceedings Article | 15 October 2003 Paper

Alignment of the grating wheel mechanism for a ground-based cryogenic near-infrared astronomy instrument

Sharon Gutkowski, Raymond Ohl, Jason Hylan, John Hagopian, Stephen Kraft, J. Mentzell, Joseph Connelly, Joseph Schepis, Leroy Sparr, Matthew Greenhouse, John MacKenty

Proceedings Volume 5172, (2003) https://doi.org/10.1117/12.503506

KEYWORDS: Optical alignment, Mirrors, Tolerancing, Cryogenics, Liquid crystals, Telescopes, Computer aided design, Metrology, James Webb Space Telescope

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Proceedings Article | 15 October 2003 Paper

Effects of forged stock on cryogenic performance of heat-treated aluminum mirrors

Ronald Toland, Raymond Ohl, Michael Barthelmy, Said Zewari, Matthew Greenhouse, John MacKenty

Proceedings Volume 5172, (2003) https://doi.org/10.1117/12.506753

KEYWORDS: Mirrors, Optical spheres, Aluminum, Cryogenics, Heat treatments, Spherical lenses, Diamond, Optical testing, Interferometers, Space telescopes

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Proceedings Article | 7 March 2003 Paper

Imaging performance and modeling of the infrared multi-object spectrometer focal reducer

Joseph Connelly, Raymond Ohl, Timo Saha, Theo Hadjimichael, John Mentzell, Ronald Mink, Jason Hylan, Leroy Sparr, John Chambers, John Hagopian, Matthew Greenhouse, Robert Winsor, John MacKenty

Proceedings Volume 4841, (2003) https://doi.org/10.1117/12.458974

KEYWORDS: Mirrors, Telescopes, Space telescopes, Wavefronts, Infrared spectroscopy, Optical alignment, Spectroscopy, Sensors, Light scattering, Tolerancing

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Proceedings Article | 7 March 2003 Paper

IRMOS: an infrared multi-object spectrometer using a MEMs micromirror array

John MacKenty, Matthew Greenhouse, Richard Green, Leroy Sparr, Raymond Ohl, Robert Winsor

Proceedings Volume 4841, (2003) https://doi.org/10.1117/12.461484

KEYWORDS: Mirrors, Sensors, Digital micromirror devices, Spectroscopy, Telescopes, Micromirrors, Space telescopes, Infrared spectroscopy, Microelectromechanical systems, Astronomical imaging

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Proceedings Article | 7 March 2003 Paper

Optical testing of diamond-machined aspheric mirrors for ground-based, near-IR astronomy

John Chambers, Ronald Mink, Raymond Ohl, Joseph Connelly, John Mentzell, Steven Arnold, Matthew Greenhouse, Robert Winsor, John MacKenty

Proceedings Volume 4841, (2003) https://doi.org/10.1117/12.458966

KEYWORDS: Mirrors, Computer generated holography, Wavefronts, Interferometers, Tolerancing, Space telescopes, Data modeling, Optical testing, Spectroscopy, Aluminum

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The Infrared Multi-Object Spectrometer (IRMOS) is a facility-class instrument for the Kitt Peak National Observatory 4 and 2.l meter telescopes. IRMOS is a near-IR (0.8-2.5 μm) spectrometer and operates at ~80 K. The 6061-T651 aluminum bench and mirrors constitute an athermal design. The instrument produces simultaneous spectra at low- to mid-resolving power (R = λ/Δλ = 300-3000) of ~100 objects in its 2.8×2.0 arcmin field. We describe ambient and cryogenic optical testing of the IRMOS mirrors across a broad range in spatial frequency (figure error, mid-frequency error, and microroughness). The mirrors include three rotationally symmetric, off-axis conic sections, one off-axis biconic, and several flat fold mirrors. The symmetric mirrors include convex and concave prolate and oblate ellipsoids. They range in aperture from 94×86 mm to 286×269 mm and in f-number from 0.9 to 2.4. The biconic mirror is concave and has a 94×76 mm aperture, R_x=377 mm, k_x=0.0778, R_y=407 mm, and k_y=0.1265 and is decentered by -2 mm in X and 227 mm in Y. All of the mirrors have an aspect ratio of approximately 6:1. The surface error fabrication tolerances are < 10 nm RMS microroughness, best effort for mid-frequency error, and < 63.3 nm RMS figure error. Ambient temperature (~293 K) testing is performed for each of the three surface error regimes, and figure testing is also performed at ~80 K. Operation of the ADE PhaseShift MicroXAM white light interferometer (micro-roughness) and the Bauer Model 200 profilometer (mid-frequency error) is described. Both the sag and conic values of the aspheric mirrors make these tests challenging. Figure testing is performed using a Zygo GPI interferometer, custom computer generated holograms (CGH), and optomechanical alignment fiducials. Cryogenic CGH null testing is discussed in detail. We discuss complications such as the change in prescription with temperature and thermal gradients. Correction for the effect of the dewar window is also covered. We discuss the error budget for the optical test and alignment procedure. Data reduction is accomplished using commercial optical design and data analysis software packages. Results from CGH testing at cryogenic temperatures are encouraging thus far.

Proceedings Article | 7 March 2003 Paper

Design and fabrication of diamond-machined aspheric mirrors for ground-based near-IR astronomy

Raymond Ohl, Werner Preuss, Alex Sohn, Shelly Conkey, Ken Garrard, John Hagopian, Joseph Howard, Jason Hylan, Sandra Irish, John Mentzell, Mechthild Schroeder, Leroy Sparr, Robert Winsor, Said Wahid Zewari, Matthew Greenhouse, John MacKenty

Proceedings Volume 4841, (2003) https://doi.org/10.1117/12.458967

KEYWORDS: Mirrors, Aluminum, Optical alignment, Spindles, Off axis mirrors, Tolerancing, Diamond, Space telescopes, Optical fabrication, Single point diamond turning

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Proceedings Article | 25 November 2002 Paper

Comparison of stress-relief procedures for cryogenic aluminum mirrors

Raymond Ohl, Michael Barthelmy, Said Wahid Zewari, Ronald Toland, Joseph McMann, David Puckett, John Hagopian, Jason Hylan, John Mentzell, Ronald Mink, Leroy Sparr, Matthew Greenhouse, John MacKenty

Proceedings Volume 4822, (2002) https://doi.org/10.1117/12.451762

KEYWORDS: Mirrors, Aluminum, Heat treatments, Spherical lenses, Cryogenics, Temperature metrology, Single point diamond turning, Camera shutters, Error analysis, Space telescopes

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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 | 18 December 2000 Paper

Performance of the Far Ultraviolet Spectroscopic Explorer mirror assemblies

Raymond Ohl, Robert Barkhouser, Steven Conard, Scott Friedman, Jeffrey Hampton, Henry Moos, Paul Nikulla, Cristina Oliveira, Timo Saha

Proceedings Volume 4139, (2000) https://doi.org/10.1117/12.410517

KEYWORDS: Mirrors, Actuators, Laser induced fluorescence, Silicon carbide, Reflectivity, Sensors, Telescopes, Satellites, Space telescopes, Line width roughness

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Proceedings Article | 2 October 2000 Paper

Optical design for an infrared imaging multi-object spectrometer (IRMOS)

Robert Winsor, John MacKenty, Massimo Stiavelli, Matthew Greenhouse, John Mentzell, Raymond Ohl, Richard Green

Proceedings Volume 4092, (2000) https://doi.org/10.1117/12.402425

KEYWORDS: Mirrors, Spectroscopy, Telescopes, Optical design, Sensors, Space telescopes, Micromirrors, Infrared spectroscopy, Astronomical imaging, Off axis mirrors

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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 | 11 November 1999 Paper

Interferometric alignment and figure testing of large (0.5 m) off-axis parabolic mirrors in a challenging cleanroom environment

Robert Barkhouser, Raymond Ohl

Proceedings Volume 3782, (1999) https://doi.org/10.1117/12.369210

KEYWORDS: Mirrors, Optical fabrication, Fringe analysis, Metrology, Optical alignment, Reflectivity, Interferometry, Off axis mirrors, Aluminum, Interferometers

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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

Hardware and methods of the optical end-to-end test of the Far-Ultraviolet Spectroscopic Explorer (FUSE)

Steven Conard, Kevin Redman, Robert Barkhouser, Douglas McGuffey, Stephen Smee, Raymond Ohl, Gary Kushner

Proceedings Volume 3765, (1999) https://doi.org/10.1117/12.366526

KEYWORDS: Collimators, Mirrors, Lamps, Satellites, Spectrographs, Optical testing, Telescopes, Sensors, Optical fabrication, Ultraviolet radiation

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Proceedings Article | 22 October 1999 Paper

Optical testing of the Far-Ultraviolet Spectroscopic Explorer primary mirrors and predicted on-orbit performance

Raymond Ohl, Scott Friedman, Timo Saha, Robert Barkhouser, Henry Moos

Proceedings Volume 3765, (1999) https://doi.org/10.1117/12.366527

KEYWORDS: Mirrors, Data modeling, Error analysis, Scattering, Tomography, Optical fabrication, Metrology, Point spread functions, Spectrographs, Sensors

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Proceedings Article | 28 August 1998 Paper

Assembly and test-induced distortions of the FUSE mirrors: lessons learned

Raymond Ohl, Robert Barkhouser, Michael Kennedy, Scott Friedman

Proceedings Volume 3356, (1998) https://doi.org/10.1117/12.324441

KEYWORDS: Mirrors, Optical fabrication, Actuators, Adhesives, Composites, Epoxies, Silicon carbide, Polishing, Off axis mirrors, Satellites

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Showing 5 of 62 publications

Conference Committee Involvement (20)

Optical System Alignment, Tolerancing, and Verification XVI

3 August 2025 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification XV

18 August 2024 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification XIV

21 August 2022 | San Diego, California, United States

Optomechanics and Optical Alignment

1 August 2021 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification XIII

24 August 2020 | Online Only, California, United States

Optical Modeling and System Alignment

12 August 2019 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification XII

19 August 2018 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification XI

6 August 2017 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification X

28 August 2016 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification IX

9 August 2015 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification VIII

17 August 2014 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification VII

25 August 2013 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification VI

12 August 2012 | San Diego, California, United States

Cryogenic Optical Systems and Instruments XIV

24 August 2011 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification V

21 August 2011 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification IV

1 August 2010 | San Diego, California, United States

Cryogenic Optical Systems and Instruments XIII

3 August 2009 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification III

2 August 2009 | San Diego, California, United States

Optical System Alignment and Tolerancing II

10 August 2008 | San Diego, California, United States

Cryogenic Optical Systems and Instruments XII

26 August 2007 | San Diego, California, United States

Showing 5 of 20 Conference Committees

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