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Proceedings Paper

Measurement of an off-axis parabolic mirror using coordinates measurement machine and swing arm profilometer during the grinding process
Author(s): Hongwei Jing; Changqing Lin; Bin Fan; Long Kuang; Shibin Wu; Fan Wu; Tianquan Fan
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Paper 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.

Paper Details

Date Published: 15 October 2012
PDF: 9 pages
Proc. SPIE 8415, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 84150K (15 October 2012); doi: 10.1117/12.976811
Show Author Affiliations
Hongwei Jing, Institute of Optics and Electronics (China)
Changqing Lin, Institute of Optics and Electronics (China)
Bin Fan, Institute of Optics and Electronics (China)
Long Kuang, Institute of Optics and Electronics (China)
Shibin Wu, Institute of Optics and Electronics (China)
Fan Wu, Institute of Optics and Electronics (China)
Tianquan Fan, Institute of Optics and Electronics (China)


Published in SPIE Proceedings Vol. 8415:
6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Wenhan Jiang; Myung K. Cho; Fan Wu, Editor(s)

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