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Proceedings Paper

Lens central thickness measurement by laser reflection-confocal technology
Author(s): Lirong Qiu; Yongkui Guo; Weiqian Zhao; Yang Xiao
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Paper Abstract

A new laser reflection-confocal thickness measurement (LRCTM) method is proposed for the reference lens central thickness calibration of the combined focal-length. LRCTM uses the reflector to reflect the convergent beam that come from the test lens to precisely identify the vertexes of test lens first and last surface, then uses ray tracing facet iterative algorithm to obtain lens central thickness. The test lens is put in the parallel light which makes its coaxality easier to adjust, and the optical path can be shortened with the reflector reflecting the convergent beam. LRCTM has high precision and concise structure, and it is suitable to be applied in the engineering. Preliminary experiments and analysis indicate that the relative measurement accuracy can be better than 0.03%.

Paper Details

Date Published: 5 August 2015
PDF: 8 pages
Proc. SPIE 9618, 2015 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 961806 (5 August 2015); doi: 10.1117/12.2193394
Show Author Affiliations
Lirong Qiu, Beijing Institute of Technology (China)
Yongkui Guo, Beijing Institute of Technology (China)
Weiqian Zhao, Beijing Institute of Technology (China)
Yang Xiao, Beijing Institute of Technology (China)


Published in SPIE Proceedings Vol. 9618:
2015 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Yongtian Wang; Xiaodi Tan; Kimio Tatsuno, Editor(s)

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