Open AccessSpatiotemporal phase-shifting method for accurate phase analysis of fringe pattern
Author(s) -
Shien Ri,
Qinghua Wang,
Peng Xia,
Hiroshi Tsuda
Publication year - 2019
Publication title -
journal of optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 95
eISSN - 2040-8986
pISSN - 2040-8978
DOI - 10.1088/2040-8986/ab3842
Subject(s) - robustness (evolution) , optics , computer science , structured light 3d scanner , phase retrieval , phase (matter) , gamma correction , profilometer , detector , waveform , absolute phase , nonlinear system , phase noise , artificial intelligence , physics , image (mathematics) , telecommunications , biochemistry , chemistry , radar , scanner , fourier transform , quantum mechanics , surface roughness , gene
High accurate phase analysis of waveforms as fringe patterns is essential for a wide range of scientific and engineering disciplines. However, precise phase analysis under extremely low signal-to-noise conditions is a challenging task for conventional phase-shifting methods. Here, a novel accurate phase recovering technique, called the spatiotemporal phase-shifting method (ST-PSM), is developed to measure the phase information robustly by utilizing two-dimensional intensity data in spatial- and temporal-domains simultaneously. Our simulation results indicated that ST-PSM had strong tolerance to random noise, and a self-neutralizing function to eliminate the periodical phase error due to the nonlinearity of detector, intensity saturation, vibration or phase-shifting error. The effectiveness was demonstrated experimentally from a non-contact shape measurement in fringe projection profilometry under extreme underexposure and overexposure recording conditions. Furthermore, by incorporating modern GPU parallel computing technology, a 4-step phase-shifted fringe pattern with 8 K image size can be calculated within one second. Due to its robustness and high accuracy with a fast calculation, therefore, we believe this technique has a significant impact on a variety of research and scientific fields.