Spatiotemporal phase-shifting method for accurate phase analysis of fringe pattern. (20th August 2019)

• Record Type: Journal Article
• Authors: Ri, Shien; Wang, Qinghua; Xia, Peng; Tsuda, Hiroshi
• Is Part Of: Journal of optics. Volume 21:Number 9(2019)
• Publication Date: 2019-08-20
• Subjects: fringe analysis -- phase measurement -- optical metrology -- phase-shifting -- Fourier transform; Optics -- Periodicals; 535.05
• DOI: 10.1088/2040-8986/ab3842
• Languages: English
• ISSNs: 2040-8978

Abstract

Abstract: 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.