Finite element analysis of lightweight active primary mirror

Wei Xin Lu; Chun Lin Guan; Chang Hui Rao

doi:10.1117/12.971461

15 October 2012 Finite element analysis of lightweight active primary mirror

Wei Xin Lu, Chun Lin Guan, Chang Hui Rao

Proceedings Volume 8415, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 84150R (2012) https://doi.org/10.1117/12.971461
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

Abstract

With the increasing requirement on spatial resolution to achieve ideal performance in space-based optical imaging system, there is a need to enlarge primary apertures. However, primary mirrors of such systems cannot maintain its optical tolerances across the mirror surface after sending to space, because of gravity change and varying ambient temperature. It necessitates active optics technology of primary mirror surface correction. Since mass-to-orbit is expensive and limited, lightweight primary mirror is needed. The paper investigates a lightweight, active primary mirror. This primary mirror structure includes lightweight face sheet and substrate with surface-parallel actuators embedded in the recess of web support ribs. Finite element models of lightweight, active primary mirror structures with different structural parameters are established and simulated. Using the response function matrixes acquired from finite element analysis, the fitting errors for Zernike polynomials are computed by MATLAB. Correctability comparisons of lightweight, active primary mirror structures with different parameters are carried out. To get best correctability, the mirrors should have small recess depth, high and thin ribs, thick face sheets and long actuators. The structural analysis result will be valuable for the design of lightweight, active primary mirror.

Citation Download Citation

Wei Xin Lu, Chun Lin Guan, and Chang Hui Rao "Finite element analysis of lightweight active primary mirror", Proc. SPIE 8415, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 84150R (15 October 2012); https://doi.org/10.1117/12.971461

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KEYWORDS

Mirrors

Actuators

Lightweight mirrors

Finite element methods

Zernike polynomials

Mirror structures

Monochromatic aberrations

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