Open AccessDirect phase extraction from interferograms with random phase shifts
Author(s) -
Jie Xu,
Qiao Xu,
Liqun Chai,
Yong Li,
Hui Wang
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.020620
Subject(s) - phase (matter) , optics , phase modulation , amplitude , trigonometric functions , interferometry , range (aeronautics) , continuous phase modulation , computer science , materials science , physics , phase noise , mathematics , telecommunications , geometry , quantum mechanics , composite material
A new method that extracts phase directly from randomly phase-shifted interferograms is proposed. In this method, the background intensity and the modulation amplitude are determined by a temporal method and used as the system parameters and then the phase is extracted from one single interferogram by arc cosine function with range of (0, π). By partitioning the extracted phase distribution into watershed regions and determining the sign of phase in each region, the extracted phase is recovered to its principle phase with range of (-π, π). Numerical simulation and experiment are implemented to verify the effectiveness of this method. The method has applications in both static and dynamic phase measurement.