Open AccessAnalysis of the synchronous phase-shifting method in a white-light spectral interferometer
Author(s) -
Tong Guo,
Lin Yuan,
Dawei Tang,
Zhuo Chen,
Feng Gao,
Xiangqian Jiang
Publication year - 2020
Publication title -
applied optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.668
H-Index - 197
eISSN - 2155-3165
pISSN - 1559-128X
DOI - 10.1364/ao.385784
Subject(s) - interferometry , optics , spectral envelope , interference (communication) , white light interferometry , fourier transform , phase noise , phase (matter) , physics , white noise , absolute phase , polarization (electrochemistry) , computer science , telecommunications , channel (broadcasting) , chemistry , quantum mechanics
For white-light spectral interferometry, the phase information is usually retrieved via the Fourier transform method and the temporal phase-shifting method. In comparison, the synchronous phase-shifting method can be used to synchronously acquire interferometric signals with good accuracy and reduced noise. Therefore, it has potential for online measurement and is suitable for application in precision industries and for ultrahigh-speed measurement. In this work, a white-light spectral interferometer for synchronous phase shifting based on polarization interference was built, and the two-step phase-shifting algorithm was used to retrieve phase information. A variety of spectral interferometric signals were simulated based on the mathematical model of the two-step phase-shifting algorithm to illustrate the effects of differences in intensity and envelope shape, random noise, and phase-shift error on measurement of the absolute distance. Measurements of the absolute distance were conducted, and they indicated that the system had high accuracy.