5 August 2015 Lens central thickness measurement by laser reflection-confocal technology
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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%.
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Lirong Qiu, Lirong Qiu, Yongkui Guo, Yongkui Guo, Weiqian Zhao, Weiqian Zhao, Yang Xiao, Yang Xiao, } "Lens central thickness measurement by laser reflection-confocal technology ", 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; https://doi.org/10.1117/12.2193394


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