Mr. Larkin B. Carey Profile

Larkin B. Carey

Optical Engineer at BAE Systems Inc

SPIE Involvement:

Author

Publications (8)

SPIE Journal Paper | 15 November 2023 Open Access

James Webb Space Telescope optical stability lessons learned for future great observatories

Lee Feinberg, Michael McElwain, Charles Bowers, John Johnston, Gary Mosier, Randy Kimble, Joshua Levi, Lightsey, Ball Aerospace, Boulder, Colorado, United States, J. Knight, Marcel Bluth, Alden Jurling, Marie Levine, D. Scott Acton, Charles Atkinson, Allison Barto, Matthew Bergkoetter, Gregory Brady, Larkin Carey, Lester Cohen, Laura Coyle, Bruce Dean, Michael Eisenhower, Nicolas Flagey, George Hartig, Keith Havey, Brian Hicks, Joseph Howard, Ritva Keski-Kuha, Charles-Philippe Lajoie, Matthew Lallo, Gary Matthews, Marcio Meléndez, Michael Menzel, Sang Park, Marshall Perrin, Laurent Pueyo, Lisbeth Quesnel, Paul Reynolds, Jane Rigby, Babak Saif, Christopher Stark, Randal Telfer, Scott Texter, Julie Van Campen, Begona Vila, Garrett West, Erin Wolf, Tony Whitman, Thomas Zielinski

JATIS, Vol. 10, Issue 01, 011204, (November 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.10.1.011204

KEYWORDS: James Webb Space Telescope, Telescopes, Inspection, Online learning, Observatories, Thermal stability, Temperature metrology, Design, Cryogenics, Interfaces

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Proceedings Article | 27 August 2022 Presentation + Paper

Phasing the Webb Telescope

D. Scott Acton, Scott Knight, Maria Carrasquilla, Nick Weiser, Michaela Masciarelli, Sarah Jurczyk, Greg Rapp, Julio Mueckay, Erin Wolf, Jess Murphy, Larkin Carey, Eric Coppock, Chanda Walker, Joel Runnels, Garrett West, Greg Wirth, Brian Hicks, Katie Melbourne, Michael Gordon, Bob Brown, Stefano Grimaldi, Derek Sabatke, Ray Wright, Laura Coyle, Taylor Chonis, Kevin Whiteaker, Marshall Perrin, Tom Comeau, Charles-Philippe Lajoie, George Hartig, Tracy Beck, Matt Lallo, Mike Regan, Randal Telfer, Marcio Meléndez, Greg Brady, Laurent Pueyo, Nicolas Flagey, Bernard Kulp, Ed Nelan, Kiera Brooks, Pierre Chayer, Shannon Osborne, Sherie Holfeltz, Tony Sohn, Tom Zielinski, Alden Jurling, Matt Bergkoetter, Chuck Bowers, Bruce Dean, Lee Feinberg, Ritva Keski-Kuha, Jeff Kirk, Michael McElwain, Joe Howard

Proceedings Volume 12180, 121800U (2022) https://doi.org/10.1117/12.2633474

KEYWORDS: Telescopes, James Webb Space Telescope, Mirrors, Wavefronts, Image processing, Actuators, Sensors, Phase retrieval

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Proceedings Article | 19 September 2018 Presentation + Paper

Optical cleaning to remove particles for JWST mirror surfaces

Lynette Lobmeyer, Larkin Carey

Proceedings Volume 10748, 107480G (2018) https://doi.org/10.1117/12.2320691

KEYWORDS: Mirrors, Particles, Adhesives, Picture Archiving and Communication System, Semiconducting wafers, James Webb Space Telescope, Telescopes, Space telescopes, Coating, Beryllium

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During Integration and Testing of large optical systems the exposed optics can become contaminated with many particles from the various test and integration environments that the hardware is exposed to. The particles may cause degradation of mirror performance due to stray light scatter and optical throughput loss due to obscuration. Cleaning the optics can be a challenge depending on what type of particles are found on the optic, how extensive the coverage, how long they have been on the surface, the type (beryllium), size and concave structure of the optics, as well as the optical coating on the surface.

Common ways to clean optics include drag wiping the surface with various cloths and solvents; blowing off the optics with ionized gaseous nitrogen (GN2); blowing off the optics with carbon dioxide (CO2) (snow gun). With these techniques the surface could be damaged if hard particles such as metallic pieces, are pushed along with the gas or wipe. Drag wiping also had the potential to smear acrylic adhesive particles and other molecular contaminates that may be present on the surface. Ionized GN2 at low velocity does not remove enough particles to make it effective at cleaning. At high velocity GN2 can damage thin light-weighted mirror substrate as well as dislodge beryllium dust from the exposed machined surface causing a potential health hazard. It also dislodges particles in a chaotic fashion potentially causing them to be forced into other sensitive regions of the optics or system. CO2 snow similarly causes all dislodged particles to move in an uncontrolled fashion. CO2 snow also significantly changes the temperature of the optic, and in the case of light-weighted space telescope optics with a thin face it can cool the surface enough to cause condensation, which in turn can leave difficult-to-remove evaporation marks on the optical surface.

A new technique utilizing a fine bristle brush was developed for JWST to safely and effectively remove the majority of the particles. This technique removes particles in a controlled fashion making sure they do not migrate to other parts of the telescope, and uses very light pressure, which avoids damage to the coating from metallic particles. Not all particles are removed but the surface is left in a much cleaner state without loose particles present. Several of the individual types such as adhesive and large fibers can be removed later with a spot cleaning technique.

Potential damage from the brush to the surface was evaluated utilizing several different techniques.

Proceedings Article | 6 July 2018 Paper

JWST optical telescope element center of curvature test

Babak Saif, Ritva Keski-Kuha, David Chaney, Perry Greenfield, Kyle Van Gorkom, Keira Brooks, Warren Hack, Marcel Bluth, Josh Bluth, James Sanders, Koby Smith, Larkin Carey, Sze Chaung, Lee Feinberg, Severine Tournois, W. Scott Smith, Vladimir Kradinov

Proceedings Volume 10698, 106983M (2018) https://doi.org/10.1117/12.2313029

KEYWORDS: Mirrors, Space telescopes, Monochromatic aberrations, James Webb Space Telescope, Computer generated holography, Telescopes, Interferometers, Optical testing, Optical alignment, Optical fabrication

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Proceedings Article | 5 September 2017 Presentation + Paper

JWST center of curvature test method and results

Babak Saif, David Chaney, Perry Greenfield, Kyle Van Gorkom, Keira Brooks, Warren Hack, Marcel Bluth, Josh Bluth, James Sanders, Koby Smith, Larkin Carey, Sze Chaung, Ritva Keski-Kuha, Lee Feinberg, Severine Tournois, W. Scott Smith, Vladimir Kradinov

Proceedings Volume 10401, 104010T (2017) https://doi.org/10.1117/12.2273974

KEYWORDS: James Webb Space Telescope, Mirrors, Space telescopes, Telescopes, Interferometers, Metrology, Optical fabrication equipment, Optical telescopes, Optical components, Optical fabrication

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Proceedings Article | 27 September 2011 Paper

The optical metrology system for cryogenic testing of the JWST primary mirror segments

James Hadaway, David Chaney, Larkin Carey

Proceedings Volume 8126, 81260P (2011) https://doi.org/10.1117/12.894582

KEYWORDS: Mirrors, Computer generated holography, Cryogenics, James Webb Space Telescope, Imaging systems, Optical metrology, Optical testing, Interferometers, Optical alignment, Control systems

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Proceedings Article | 20 September 2007 Paper

Using multifield measurements to eliminate alignment degeneracies in the JWST testbed telescope

Erin Sabatke, Scott Acton, John Schwenker, Tim Towell, Larkin Carey, Duncan Shields, Adam Contos, Doug Leviton

Proceedings Volume 6687, 668707 (2007) https://doi.org/10.1117/12.736309

KEYWORDS: Mirrors, James Webb Space Telescope, Wavefronts, Space telescopes, Telescopes, Image segmentation, Monochromatic aberrations, Phase retrieval, Matrix multiplication, Wavefront sensors

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Proceedings Article | 20 September 2007 Paper

TRL-6 for JWST wavefront sensing and control

Lee Feinberg, Bruce Dean, David Aronstein, Charles Bowers, William Hayden, Richard Lyon, Ron Shiri, J. Scott Smith, D. Scott Acton, Larkin Carey, Adam Contos, Erin Sabatke, John Schwenker, Duncan Shields, Tim Towell, Fang Shi, Luis Meza

Proceedings Volume 6687, 668708 (2007) https://doi.org/10.1117/12.736059

KEYWORDS: Image segmentation, James Webb Space Telescope, Wavefronts, Phase retrieval, Mirrors, Telescopes, Wavefront sensors, Sensors, Cameras, Phase modulation

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Showing 5 of 8 publications

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