Further study of the phase-recovering algorithm for saturated fringe patterns with a larger saturation coefficient in the projection grating phase-shifting profilometry |
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Authors: | Eryi Hu Weiping Wu |
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Institution: | Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China |
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Abstract: | The phase error will occur when captured fringe patterns are saturated in the projection grating phase-shifting profilometry. The phase-recovering algorithm corresponding to seven-frame phase-shifting method is deduced. The applicability ranges of phase-recovering algorithms corresponding to different phase-shifting methods are studied with different intensity saturation coefficients by a simulative method. Simulative results indicate that the phase error caused by the intensity saturation can be effectively decreased by the phase-recovering algorithm when the saturation coefficient of fringe patterns is within the applicability range of the corresponding phase-recovering algorithm. Furthermore, the applicability range of the phase-recovering algorithm will be extended with the increase of phase-shifting steps. An experimental result is presented to prove the availability of the phase-recovering algorithm. |
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Keywords: | Phase-shifting technique Intensity saturation Phase error Saturation coefficient Phase-recovering algorithm |
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