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Proceedings Paper

Corrective technique of null lens's unsymmetrical error
Author(s): Peiji Guo; Jingchi Yu
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Paper Abstract

Null testing by null lens is the most important method to test high precision aspherical surface, and the error of null lens affects the measurement accuracy of the aspherical surface directly. In testing processing, the error of null lens brings two kinds of wavefront aberration, among which one is symmetrical, the other is unsymmetrical. In the paper, a technique to correct the unsymmetrical part was described. The technique is based on expressing wavefront aberration in terms of zernike's circle polynomials. By turning the null lens on different degrees along its optic axis, different testing results were got. According to these results, wavefront aberration's unsymmetrical coefficients of zernike's circle polynomials which were introduced by the error of null lens were gained, then a corrective file to correct the last testing result can be made. Experimental result shows this technique is very effective, and it has been successfully applied to testing a hyperboloid convex surface.

Paper Details

Date Published: 19 May 2006
PDF: 5 pages
Proc. SPIE 6150, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 615002 (19 May 2006); doi: 10.1117/12.676908
Show Author Affiliations
Peiji Guo, Suzhou Univ. (China)
Jingchi Yu, Suzhou Univ. (China)


Published in SPIE Proceedings Vol. 6150:
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Xun Hou; Jiahu Yuan; James C. Wyant; Hexin Wang; Sen Han, Editor(s)

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