A simple method for focal length measurement

Hua Ma; Huan Ren; Lin Zhang; Zhengdong Shi; Quan Yuan; Yi Yang

doi:10.1117/12.2245081

27 September 2016 A simple method for focal length measurement

Hua Ma, Huan Ren, Lin Zhang, Zhengdong Shi, Quan Yuan, Yi Yang

Proceedings Volume 9684, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test, Measurement Technology, and Equipment; 96843R (2016) https://doi.org/10.1117/12.2245081
Event: Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), 2016, Suzhou, China

Abstract

A simple method for focal length measurement based on image processing is demonstrated and discussed. The collimated beam, detector, motorized translation stage and computer make up of this test system. The two spots pass through the tested lens is accepted by detector, which is transferred twice by motorized translation stage. By acquired the difference of two spots by image processing, the focal length of the tested lens can be gained. The error sources in the measurement are analyzed. Then the results of experiment show that the relative error was 0.1%. This method can be used in workshop and labs for its convenience and low cost.

Citation Download Citation

Hua Ma, Huan Ren, Lin Zhang, Zhengdong Shi, Quan Yuan, and Yi Yang "A simple method for focal length measurement", Proc. SPIE 9684, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test, Measurement Technology, and Equipment, 96843R (27 September 2016); https://doi.org/10.1117/12.2245081

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