Laser confocal measurement system for curvature radius of lenses based on grating ruler

Jiwei Tian; Yun Wang; Nan Zhou; Weirui Zhao; Weiqian Zhao

doi:10.1117/12.2181193

6 March 2015 Laser confocal measurement system for curvature radius of lenses based on grating ruler

Jiwei Tian, Yun Wang, Nan Zhou, Weirui Zhao, Weiqian Zhao

Proceedings Volume 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation; 94462T (2015) https://doi.org/10.1117/12.2181193
Event: International Symposium on Precision Engineering Measurement and Instrumentation, 2014, Changsha/Zhangjiajie, China

Abstract

In the modern optical measurement field, the radius of curvature (ROC) is one of the fundamental parameters of optical lens. Its measurement accuracy directly affects the other optical parameters, such as focal length, aberration and so on, which significantly affect the overall performance of the optical system. To meet the demand of measurement instruments for radius of curvature (ROC) with high accuracy in the market, we develop a laser confocal radius measurement system with grating ruler. The system uses the peak point of the confocal intensity curve to precisely identify the cat-eye and confocal positions and then measure the distance between these two positions by using the grating ruler, thereby achieving the high-precision measurement for the ROC. The system has advantages of high focusing sensitivity and anti-environment disturbance ability. And the preliminary theoretical analysis and experiments show that the measuring repeatability can be up to 0.8 um, which can provide an effective way for the accurate measurement of ROC.

Citation Download Citation

Jiwei Tian, Yun Wang, Nan Zhou, Weirui Zhao, and Weiqian Zhao "Laser confocal measurement system for curvature radius of lenses based on grating ruler", Proc. SPIE 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation, 94462T (6 March 2015); https://doi.org/10.1117/12.2181193

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