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A comparison of performance of lightweight mirrorsFour lightweight solid contoured back mirror shapes (a double arch, a single arch, a modified single arch, and a double concave mirror) and a cellular sandwich lightweight meniscus mirror, have been considered for the primary mirror of the Space Infrared Telescope Facility (SIRTF). A parametric design study using these shapes for the SIRTF 40 inch primary mirror with a focal ratio f/2 is presented. Evaluations of the optical performance and fundamental frequency analyses are performed to compare relative merits of each mirror configuration. Included in these are structural, optical, and frequency analyses for (1) different back contour shapes, (2) different number and location of the support points, and (3) two gravity orientations (ZENITH and HORIZON positions). The finite element program NASTRAN is used to obtain the structural deflections of the optical surface. For wavefront error analysis, FRINGE and PCFRINGE programs are used to evaluate the optical performance. A scaling law relating the optical and structural performance for various mirror contoured back shapes is developed.
Document ID
19920040233
Document Type
Conference Paper
Authors
Cho, Myung K. (NASA Ames Research Center Moffett Field, CA, United States)
Richard, Ralph M. (NASA Ames Research Center Moffett Field, CA, United States)
Hileman, Edward A. (Arizona, University Tucson, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Subject Category
ENGINEERING (GENERAL)
Meeting Information
Cryogenic Optical Systems and Instruments IV(San Diego, CA)
Funding Number(s)
CONTRACT_GRANT: NAG2-426
Distribution Limits
Public
Copyright
Other