Optical metrology of the JWST Integrated Science Instrument Module test platform

Details Optical metrology of the JWST Integrated Science Instrument Module test platform Optical metrology of the JWST Integrated Science Instrument Module test platform

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spie.7433e...3s&link_type=abstract

Optical System Alignment, Tolerancing, and Verification III. Edited by Sasián, José; Youngworth, Richard N. Proceedings of th

Physics

Scientific paper

The James Webb Space Telescope is a large infrared observatory with a segmented primary mirror, part of the Optical Telescope Element (OTE), and four science instruments supported by the Integrated Science Instrument Module (ISIM). We present the calibration plan for the ISIM Test Platform (ITP) which replicates the ISIM-to-OTE interface: to calibrate the location and orientation of metrology features at ambient and cryogenic environmental conditions, to verify that ITP behavior (deflection under load, warm-to-cold alignment shift) can be modeled, predicted, and tested, to prove that the ITP is stable (upon repeated cryogenic cycles, and after loading and handling), and to calibrate the relationship between the Master Alignment Target Fixture and the ITP at ambient and cryogenic conditions.

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