Physics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1303...65f&link_type=abstract
IN: Advances in optical structure systems; Proceedings of the Meeting, Orlando, FL, Apr. 16-19, 1990 (A91-36651 15-74). Bellingh
Physics
1
Mirrors, Space Based Radar, Spaceborne Lasers, Temperature Effects, Thermal Analysis, Thermal Blooming, Finite Element Method, Focusing, Holographic Interferometry, Optical Radar
Scientific paper
A method is described to assess the figure change created by thermal distortion in beryllium sandwich mirrors during solar exposure in space. A NASTRAN finite element model of a mirror is used to evaluate the procedure, which uses embedded temperature sensors. The method is tested, with respect to six parameters, on an aluminum thermal surrogate mirror. Thermal gradients in most full-depth sandwich configurations are shown to be minimized, due to the high thermal conductivity of aluminum. Overall rms figure and defocus deformation are predicted to within 15 percent; the coma and astigmatism are predicted to within 20-25 percent; and the variability in predicting higher order distortions is wide. Defocus is shown to be the most likely dominant term in temperature-induced distortion. The notion is posited that provisions are necessary to counterbalance the high CTE of metal mirrors during solar exposure.
Forman Steven E.
Sultana John A.
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