Measurement of Large Aspherical Mirrors using Coordinate Measurement Machine during the grinding process

Hongwei Jing; Long Kuang; Tianquan Fan; Xuedong Cao

doi:10.1117/12.674093

30 May 2006 Measurement of large aspherical mirrors using coordinate measurement machine during the grinding process

Hongwei Jing, Long Kuang, Tianquan Fan, Xuedong Cao

Proceedings Volume 6148, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 61480I (2006) https://doi.org/10.1117/12.674093
Event: 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2005, Xian, China

Abstract

A new method has been developed to measure large aspherical mirrors accurately, quickly, and economically by using CMM (coordinate measurement machine). By using CMM to get the 3D coordinates of the actual points on the large aspherical mirrors and make bestfitting of actual surface and nominal surface, we can evaluate the surface of the large aspherical mirrors. It costs only 2 hours to measure an aspherical mirror with diameter larger than 1000mm. The results show good agreement with the results measured by Hartmann-Shack interferometer. Using this method, we can supervise the profile error to less than 5 μm PV during the grinding process. All the aspherical mirrors with dimensions within the range of the machine can be measured.

Citation Download Citation

Hongwei Jing, Long Kuang, Tianquan Fan, and Xuedong Cao "Measurement of large aspherical mirrors using coordinate measurement machine during the grinding process", Proc. SPIE 6148, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 61480I (30 May 2006); https://doi.org/10.1117/12.674093

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