Modified Fourier-transform method for phase-shift calibration |
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Authors: | Fuzhong Bai Feng HanYongxiang Xu Xiaoyan BaoShiming Gan |
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Institution: | College of Mechanical Engineering, Inner Mongolia University of Technology, Huhhot 010051, People's Republic of China |
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Abstract: | A fast convergent algorithm to accurately measure phase-shift for phase shifter is proposed. In the presence of a spatial carrier frequency, an error function in the Fourier-domain is introduced and then the unknown phase-shift between two phase-shifted fringe patterns is determined by minimization of the error function with the help of a golden section search approach. Compared with the conventional Fourier-transform method, the modified method proposed in the paper is more immune to random noise and hence can give a more accurate result. The translation curve of a liquid-crystal spatial light modulator is also experimentally calibrated. |
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Keywords: | Phase-shift calibration Fringe pattern Modified Fourier-transform method Golden section search approach |
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