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21 September 2011 Effects of accelerations and surface conditions on a pre-designed lightweight primary mirror
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Abstract
The effect of the acceleration force during launch on the primary mirror of a Cassegrain telescope has been studied in the paper. Finite element method and Zernike polynomial fitting are applied to the ZERODURR primary mirror with a predesigned lightweight configuration on the back. The relations between several selected surface treatment conditions and the mirror characteristic strength as well as the safety factors under various launch accelerations have been investigated. It is found that the surface treatment on the mirror surface needs to be at least ground using a D251 or finer tool to keep the load safety factor of the primary mirror structure of the telescope higher than 1.5 aerially. In addition the principle strss difference of the lightweight ZERODURR mirror induced by the grinding process with an average grain size of 149 μm is up to 1 MPa.
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C. Y. Chan, Y. C. Cheng, S. T. Chang, T. M. Huang, and M. Y. Hsu "Effects of accelerations and surface conditions on a pre-designed lightweight primary mirror", Proc. SPIE 8127, Optical Modeling and Performance Predictions V, 81270F (21 September 2011); https://doi.org/10.1117/12.892257
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