Stability research of fore-telescope system with mechanical passive athermalization design

Jian Sun; Wei Wang; Bing-liang Hu; Si-yuan Li; Chun-bo Zou; Yu-tao Feng

doi:10.1117/12.2651530

20 January 2023 Stability research of fore-telescope system with mechanical passive athermalization design

Jian Sun, Wei Wang, Bing-liang Hu, Si-yuan Li, Chun-bo Zou, Yu-tao Feng

Proceedings Volume 12558, AOPC 2022: Optical Spectroscopy and Imaging; 125580F (2023) https://doi.org/10.1117/12.2651530
Event: Applied Optics and Photonics China 2022 (AOPC2022), 2022, Beijing, China

Abstract

With the improvement of spatial resolution, the focal length of space cameras and spectral imagers become longer. The thermal stability of image stability is more sensitive, with the temperature, especially in VNIR (visible and near-infrared). To solve the thermal stability of R-C(Ritchey-Chrétien) long focal length fore-telescope system, the relevant factors are discussed, on the basis of the LASIS(Large Aperture Static Imaging Spectrometer), and the change in the spacing between primary mirror and secondary mirror with temperature is proposed. Base on the calculation in theory, the method of mechanical passive athermalization design is developed. Mechanical test results indicate that the first natural frequency is 195Hz, above the 100 Hz. The thermal experiments show that the stability of primary mirror and secondary mirror spacing is 0.5μm.℃^-1 , consisting with the FEA(Finite Element Analysis) value

Citation Download Citation

Jian Sun, Wei Wang, Bing-liang Hu, Si-yuan Li, Chun-bo Zou, and Yu-tao Feng "Stability research of fore-telescope system with mechanical passive athermalization design", Proc. SPIE 12558, AOPC 2022: Optical Spectroscopy and Imaging, 125580F (20 January 2023); https://doi.org/10.1117/12.2651530

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