Measurement of an off-axis parabolic mirror using coordinates measurement machine and swing arm profilometer during the grinding process

Hongwei Jing; Changqing Lin; Bin Fan; Long Kuang; Shibin Wu; Fan Wu; Tianquan Fan

doi:10.1117/12.976811

15 October 2012 Measurement of an off-axis parabolic mirror using coordinates measurement machine and swing arm profilometer during the grinding process

Hongwei Jing, Changqing Lin, Bin Fan, Long Kuang, Shibin Wu, Fan Wu, Tianquan Fan

Author Affiliations +

Proceedings Volume 8415, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 84150K (2012) https://doi.org/10.1117/12.976811
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

Abstract

We present the measurement methods for off-axis parabolic mirrors using Coordinates Measurement Machine and Swing Arm Profilometer during the grinding process. An off-axis parabolic mirror with 1200mm in parent focal length, 360mm in off-axis displacement and 410mm in diameter is measured using the methods introduced in this paper. The convergence curves of the surface error are reported, which is reduced from 204.7μm in PV, 55.3μm in rms to 1.1μm in PV, 0.3μm in rms after 39 iterations of grinding. Besides, the measurement methods are able to control the parent focal length and off-axis displacement to less than 0.1mm tolerance. An interferometric result is presented, which validates the measurement methods.

Citation Download Citation

Hongwei Jing, Changqing Lin, Bin Fan, Long Kuang, Shibin Wu, Fan Wu, and Tianquan Fan "Measurement of an off-axis parabolic mirror using coordinates measurement machine and swing arm profilometer during the grinding process", Proc. SPIE 8415, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 84150K (15 October 2012); https://doi.org/10.1117/12.976811

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