Deformation analysis of a lightweight metal mirror

Jianwei Zhou; Wumei Lin; Guoqing Liu; Tingwen Xing

doi:10.1117/12.574693

10 February 2005 Deformation analysis of a lightweight metal mirror

Jianwei Zhou, Wumei Lin, Guoqing Liu, Tingwen Xing

Proceedings Volume 5638, Optical Design and Testing II; (2005) https://doi.org/10.1117/12.574693
Event: Photonics Asia, 2004, Beijing, China

Abstract

The weight of the optical elements of a system used in the aviation and aerospace industry must be as light as possible, on condition that the imaging performance of the system satisfies user’s demand. However, optical elements will deform easily under internal or external pressure if it becomes thinner, and then influences the imaging performance of the whole optical system. In this paper, the main mirror of the Cassegrain system is studied with finite-element analysis (FEA) to predict its surface deformation through simulating its working conditions. The surface deformation is also tested and analyzed after machining and mounting. The obtained interferometric data, Zernike coefficients, is written into CODE V, an excellent software for designing optical systems, to analyze the imaging performance of the designed optical system. Through analyzing the deformation of the metal mirror it can be found that the maxima RMS change of the whole optical system is 0.0059λ, which is only 1.52 percent of the designed value. In the full field of view, the RMS error is less than 0.07λ, that means the imaging performance of the whole optical system is close to the diffraction limit.

Citation Download Citation

Jianwei Zhou, Wumei Lin, Guoqing Liu, and Tingwen Xing "Deformation analysis of a lightweight metal mirror", Proc. SPIE 5638, Optical Design and Testing II, (10 February 2005); https://doi.org/10.1117/12.574693

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