Open AccessPhase-shifts nπ/2 calibration method for phase-stepping interferometry
Author(s) -
Fuzhong Bai,
Changhui Rao
Publication year - 2009
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.016861
Subject(s) - interferometry , optics , phase (matter) , calibration , phase shift module , phase modulation , physics , series (stratigraphy) , phase retrieval , phase noise , fourier transform , geology , paleontology , quantum mechanics , insertion loss
A novel phase-shifts n pi/2 calibration method for phase-stepping interferometry, in which the sum intensities and the squared sum of a series of phase-shifted interferograms are firstly calculated, and then by the minimization of the variances of these sums perform the n pi/2 phase-shifts calibration, is proposed in this paper. The proposed method can overcome effectively the effect of the variations of background and modulation intensities in interferograms with any phase structure, and it is also insensitive to the nonlinearity of phase shifter. Numerical simulation and experiments are implemented to verify the effectiveness of this method.