Figure measurement of AIMS primary mirror using sub-aperture stitching interferometry

Kewei E.; Ming Chang; Jing Li; Xin Fu; Jianke Zhao; Tao Wang; Yu Lei; Shangkuo Liu; Xun Xue; Yan Zhou; Songbo Xu

doi:10.1117/12.2638451

15 November 2022 Figure measurement of AIMS primary mirror using sub-aperture stitching interferometry

Kewei E., Ming Chang, Jing Li, Xin Fu, Jianke Zhao, Tao Wang, Yu Lei, Shangkuo Liu, Xun Xue, Yan Zhou, Songbo Xu

Proceedings Volume 12448, 5th Optics Young Scientist Summit (OYSS 2022); 124481C (2022) https://doi.org/10.1117/12.2638451
Event: 5th Optics Young Scientist Summit (OYSS 2022), 2022, Fuzhou, China

Abstract

The national major scientific research instrument project: “The accurate infrared solar magnetic field measurements system” (AIMS) is under construction. The figure of the primary of the AIMS can be measured using a computer generated hologram (CGH) test during the polishing process, however, a distortion correction procedure is needed to mapping the coordinates of the mirror and the pixels of fringes due to the large distortion exists in the CGH test configuration, and the mapping relationship need to be re-calibrated after the primary mirror was reassembled, which makes the test process cumbersome. In this paper, a sub-aperture stitching equipment was established, which uses a two\dimensional guide that can move a 450mm reference flat mirror to any position that can cover the aperture of the primary mirror. The surface shape requirement of the 450 mm flat mirror was given by Monte-Carlo analysis and further the figure was tested by using Ritchey-Common technique. Furthermore, a sub-aperture stitching test system was established and a modified simultaneous fitting algorithm was proposed to stitch the sub-aperture wavefront together, the correctness of the technique was verified by a full aperture figure test experiment. Finally, we applied the developed approach to the site test of figure of the AIMS primary mirror.

Citation Download Citation

Kewei E., Ming Chang, Jing Li, Xin Fu, Jianke Zhao, Tao Wang, Yu Lei, Shangkuo Liu, Xun Xue, Yan Zhou, and Songbo Xu "Figure measurement of AIMS primary mirror using sub-aperture stitching interferometry", Proc. SPIE 12448, 5th Optics Young Scientist Summit (OYSS 2022), 124481C (15 November 2022); https://doi.org/10.1117/12.2638451

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KEYWORDS

Mirrors

Reconstruction algorithms

Wavefronts

Error analysis

Interferometers

Off axis mirrors

Polishing

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