scholarly journals General iterative algorithm for phase-extraction from fringe patterns with random phase-shifts, intensity harmonics and non-uniform phase-shift distribution

2021 ◽  
Author(s):  
Yuchi Chen ◽  
Kemao Qian
Keyword(s):  
Phase Shift ◽  
Iterative Algorithm ◽  
Random Phase ◽  
Phase Shifts ◽  
Phase Extraction ◽  
Fringe Patterns

Phase extraction from random phase-shifted shadow moiré fringe patterns using stereovision technique

2014 ◽  
Vol 53 (4) ◽  
pp. 044109 ◽  
Author(s):  
Hubing Du ◽  
Jianhua Wang ◽  
Hong Zhao ◽  
Feifei Gu ◽  
Jinlei Zhao
Keyword(s):  
Random Phase ◽  
Phase Extraction ◽  
Shadow Moire ◽  
Shadow Moiré ◽  
Moire Fringe ◽  
Moiré Fringe ◽  
Fringe Patterns

scholarly journals Direct phase extraction from interferograms with random phase shifts

2010 ◽  
Vol 18 (20) ◽  
pp. 20620 ◽  
Author(s):  
Jiancheng Xu ◽  
Qiao Xu ◽  
Liqun Chai ◽  
Yong Li ◽  
Hui Wang
Keyword(s):  
Random Phase ◽  
Phase Shifts ◽  
Phase Extraction

scholarly journals Measurement of step surface contour based on variable sampling phase shift interference phase extraction algorithm based on selective sampling

2020 ◽  
Author(s):  
Songsong Zhang ◽  
Haisong Huang ◽  
Qiaoqiao Xiong
Keyword(s):  
Phase Shift ◽  
Iterative Algorithm ◽  
Phase Shifting ◽  
Variable Frequency ◽  
Phase Extraction ◽  
Selective Sampling ◽  
Unknown Phase ◽  
Extraction Algorithm ◽  
Interference Phase ◽  
Frequency Phase

Abstract Variable frequency phase shift interferometry is widely applied in optical precision measurement, with the accuracy of phase extraction’s direct impact on that of phase shift interferometry. In the variable-frequency phase-shift interferometry, the commonly used phase-shifting devices are prone to phase shift errors, because the ordinary equal-step phase extraction algorithm, which can be merely used to measure simple and smooth surface, influences the accuracy of phase extraction resulting in measuring error, and causes inefficiency led by the long time the iterative process lasts for when applied in complex stepped surfaces measurement. As a sort of step-by-step phase-shifting phase extraction algorithm based on selective sampling is used to measure the step surface contour, the interference image is firstly sampled at equal intervals to reduce the iterative calculation, and in view of the fact that the phase calibration of the test system is not required in this algorithm, the measured phase is given by using the alternating iterative method despite the unknown phase and unknown phase shift amount. The phase extraction accuracy and iteration time among traditional iterative algorithm, four-step phase shift algorithm and the variable phase shift phase interpolation algorithm based on selective sampling are compared in the simulation and experiment. It is shown that the variable frequency phase shifting interference phase extraction algorithm based on selective sampling has shorter operation time, less error and higher accuracy than traditional iterative algorithm in measuring complex step surface.

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