2 August 2014 New method for characterizing the state of optical and opto-mechanical systems
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James Webb Space Telescope Optical Telescope Element (OTE) is a three mirror anastigmat consisting of a 6.5 m primary mirror (PM), a secondary mirror (SM) and a tertiary mirror. The primary mirror is made out of 18 segments. The telescope and instruments will be assembled at Goddard Space Flight Center (GSFC) to build the Optical Telescope Element-Integrated Science Instrument Module (OTIS). The OTIS will go through environmental testing at GSFC before being transported to Johnson Space Center for testing at cryogenic temperature. The objective of the primary mirror Center of Curvature test (CoC) is to characterize the PM before and after the environmental testing for workmanship. This paper discusses the CoC test including both a surface figure test and a new method for characterizing the state of the primary mirror using high speed dynamics interferometry.
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Babak Saif, Ritva Keski-Kuha, Lee Feinberg, David Chaney, Marcel Bluth, Perry Greenfield, Warren Hack, Scott Smith, James Sanders, "New method for characterizing the state of optical and opto-mechanical systems", Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91430C (2 August 2014); doi: 10.1117/12.2055243; https://doi.org/10.1117/12.2055243

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