Open AccessSingle-phase-step method with contoured correlation fringe patterns for ESPI
Author(s) -
Qifeng Yu,
Shaojing Fu,
Xiaolin Liu,
X. H. Yang,
Xiangyi Sun
Publication year - 2004
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.12.004980
Subject(s) - electronic speckle pattern interferometry , speckle pattern , speckle noise , optics , speckle imaging , phase (matter) , interferometry , noise (video) , shearography , phase noise , computer science , physics , artificial intelligence , image (mathematics) , quantum mechanics
Speckle fringe patterns of electronic speckle pattern interferometry (ESPI) are full of high-level speckle noise and are mainly processed by phase-shifting methods that normally require three speckle fringe patterns or more. The author proposes a novel method, the contoured correlation-fringe-pattern (CCFP) method, by which speckle-noise-free fringe patterns can be generated for ESPI. The application of this novel method is extended to the phase-shifting or phase-stepping for ESPI after its improvement. It generates speckle-noise-free phase fringes and remains valid for single phase-step condition, thus eliminates the two main disadvantages of the phase-shifting (stepping) methods of ESPI.