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Proceedings Paper

Cryogenic metrology for the James Webb Space Telescope Integrated Science Instrument Module alignment target fixtures using laser radar through a chamber window
Author(s): T. Hadjimichael; D. Kubalak; A. Slotwinski; P. Davila; B. Eegholm; W. Eichhorn; J. Hayden; E. Mentzell; R. Ohl; G. Scharfstein; R. Telfer
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Paper Abstract

The James Webb Space Telescope Integrated Science Instrument Module utilizes two fixtures to align the Optical Telescope Element Simulator (OSIM) to the coordinate systems established on the ISIM and the ISIM Test Platform (ITP). These fixtures contain targets which are visible to the OSIM Alignment Diagnostics Module (ADM). Requirements on these fixtures must be met under ambient and cryogenic conditions. This paper discusses the cryogenic metrology involving Laser Radar measurements through a chamber window that will be used to link photogrammetry target measurements used during ISIM structure cryogenic verification and the ADM targets, including evaluation of distortion introduced from the window.

Paper Details

Date Published: 3 September 2010
PDF: 10 pages
Proc. SPIE 7793, Optical System Alignment, Tolerancing, and Verification IV, 77930B (3 September 2010); doi: 10.1117/12.862693
Show Author Affiliations
T. Hadjimichael, NASA Goddard Space Flight Ctr. (United States)
D. Kubalak, NASA Goddard Space Flight Ctr. (United States)
A. Slotwinski, Nikon Metrology, Inc. (United States)
P. Davila, NASA Goddard Space Flight Ctr. (United States)
B. Eegholm, Sigma Space Corp. (United States)
W. Eichhorn, NASA Goddard Space Flight Ctr. (United States)
J. Hayden, Sigma Space Corp. (United States)
E. Mentzell, NASA Goddard Space Flight Ctr. (United States)
R. Ohl, NASA Goddard Space Flight Ctr. (United States)
G. Scharfstein, Flexure Engineering, LLC (United States)
R. Telfer, Orbital Sciences Corp. (United States)


Published in SPIE Proceedings Vol. 7793:
Optical System Alignment, Tolerancing, and Verification IV
José Sasián; Richard N. Youngworth, Editor(s)

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