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Performance of the Primary Mirror Center-of-Curvature Optical Metrology System during Cryogenic Testing of the JWST Pathfinder TelescopeThe JWST primary mirror consists of 18 1.5 m hexagonal segments, each with 6-DoF and RoC adjustment. The telescope will be tested at its cryogenic operating temperature at Johnson Space Center. The testing will include center-of-curvature measurements of the PM, using the Center-of-Curvature Optical Assembly (COCOA) and the Absolute Distance Meter Assembly (ADMA). The performance of these metrology systems, including hardware, software, procedures, was assessed during two cryogenic tests at JSC, using the JWST Pathfinder telescope. This paper describes the test setup, the testing performed, and the resulting metrology system performance.
Document ID
20160007973
Acquisition Source
Goddard Space Flight Center
Document Type
Presentation
Authors
Hadaway, James B. (Exelis, Inc. McLean, VA, United States)
Wells, Conrad (Exelis, Inc. McLean, VA, United States)
Olczak, Gene (Harris Corp. Rochester, NY, United States)
Waldman, Mark (Harris Corp. Rochester, NY, United States)
Whitman, Tony (Northrop Grumman Space and Mission Systems Corp. Fairfax, VA, United States)
Cosentino, Joseph (Exelis, Inc. McLean, VA, United States)
Connolly, Mark (Northrop Grumman Space and Mission Systems Corp. Fairfax, VA, United States)
Chaney, David (Northrop Grumman Space and Mission Systems Corp. Fairfax, VA, United States)
Telfer, Randal (Space Telescope Science Inst. Baltimore, MD, United States)
Date Acquired
June 28, 2016
Publication Date
June 26, 2016
Subject Category
Optics
Instrumentation And Photography
Report/Patent Number
GSFC-E-DAA-TN33074
Meeting Information
Meeting: SPIE Astronomical Telescopes & Instrumentation 2016
Location: Edinburgh, Scotland
Country: United Kingdom
Start Date: June 26, 2016
End Date: July 1, 2016
Sponsors: International Society for Optical Engineering
Funding Number(s)
CONTRACT_GRANT: NAS5-03127
CONTRACT_GRANT: NNG11FD64C
CONTRACT_GRANT: NAS5-02200
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
JWST
CoCOA
ADMA

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