Test of vertex radius and conic constant of a conic surface by means of interferometry

Gaofeng Wu; Qiang Chen; Xi Hou

doi:10.1117/12.828823

20 May 2009 Test of vertex radius and conic constant of a conic surface by means of interferometry

Gaofeng Wu, Qiang Chen, Xi Hou

Proceedings Volume 7283, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 72834D (2009) https://doi.org/10.1117/12.828823
Event: AOMATT 2008 - 4th International Symposium on Advanced Optical Manufacturing, 2008, Chengdu, Chengdu, China

Abstract

The vertex radius of conic (vertex ROC) and conic constant (CC) are important shape parameters for conic surface. An interferometric method that can determine these two parameters by comparing the sub-surface with a spherical reference wavefront equal to local sagittal, medial or tangential ROC is introduced in detail. The measured wavefront aberrations, particularly astigmatism and coma, and local radius difference are used to calculate vertex ROC and CC. The influence factors on measurement accuracy are analyzed and an effective method for reducing such influences is also presented. According to the mathematic model, the programs to simulate the test results numerically are compiled by Matlab.

Citation Download Citation

Gaofeng Wu, Qiang Chen, and Xi Hou "Test of vertex radius and conic constant of a conic surface by means of interferometry", Proc. SPIE 7283, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 72834D (20 May 2009); https://doi.org/10.1117/12.828823

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