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AN Qi-chang, WU Xiao-xia, ZHANG Jing-xu, LI Hong-wen, ZHU Jia-kang. Sub region curvature sensing method for survey telescope with larger aperture[J]. Chinese Optics. doi: 10.37188/CO.2022-0117
Citation: AN Qi-chang, WU Xiao-xia, ZHANG Jing-xu, LI Hong-wen, ZHU Jia-kang. Sub region curvature sensing method for survey telescope with larger aperture[J]. Chinese Optics. doi: 10.37188/CO.2022-0117

Sub region curvature sensing method for survey telescope with larger aperture

doi: 10.37188/CO.2022-0117
Funds:  Supported by National Natural Science Foundation of China (No. 62005279); the Youth Innovation Promotion Association of the Chinese Academy of Sciences (No. 2020221); the Equipment Development Project of the Chinese Academy of Sciences (No. YJKYYQ20200057); Jilin Science and Technology Development Program (No. 20220402032GH)
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  • The large aperture sky survey telescope needs closed-loop error correction based on the feedback of its wavefront sensing system, so as to give it a better confirm to its limit detection ability. In this paper, firstly, the basic theoretical expression of sub region curvature sensing is derived. Then, a joint simulation model is established. The process of sub region curvature sensing is simulated and analyzed by using the combination of optical design software and numerical calculation software. Finally, by setting up a desktop experiment, the cross-comparison of single- and multi-target curvature sensors is carried out to verify the correctness of the algorithm. Compared to the traditional active optical technology, the method proposed in this paper can improve the detection signal-to-noise ratio and sampling speed by expanding the available guide stars. For the standard wavefront, compared with the single guide star curvature sensor, the error is 0.02 operating wavelengths (RMS), and the error is less than 10%, which can effectively improve the correction ability of the active optical system.


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