Calibration method for angular measurement of moiré patterns

Fan He; Jian Bai; Kaiwei Wang; Xiyun Hou; Jiang Yao

doi:10.1117/12.2070535

18 September 2014 Calibration method for angular measurement of moiré patterns

Fan He, Jian Bai, Kaiwei Wang, Xiyun Hou, Jiang Yao

Proceedings Volume 9282, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 92821B (2014) https://doi.org/10.1117/12.2070535
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China

Abstract

In this paper, a high-accuracy calibration method for angular measurement of deformed and curved Moiré patterns, based on template matching algorithm, is presented. We report a feasible and accurate method, based on Talbot interferometry and Moiré deflectometry, to measure long focal-length lenses. Theoretical analysis indicates that the precision of this method is mainly influenced by the angle of Moiré patterns. However, it’s difficult to obtain high-accuracy angle of Moiré patterns, since the Moiré patterns derived from experiment are constantly deformed or curved. We demonstrate a method, based on template matching algorithm, to calibrate deformed and curved Moiré patterns, thus their angle can be calculated fast and accurately in sub-pixel domain. Numerical analysis and simulation prove that the method mentioned above demonstrates high precision and stability, and experiment results show that the accuracy of the long focal lengths measurement is improved obviously.

Citation Download Citation

Fan He, Jian Bai, Kaiwei Wang, Xiyun Hou, and Jiang Yao "Calibration method for angular measurement of moiré patterns", Proc. SPIE 9282, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 92821B (18 September 2014); https://doi.org/10.1117/12.2070535

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Calibration

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