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- Title
Rapid phase extraction method based on the difference image between interferograms with unknown phase-shifting amount.
- Authors
Zhang, Fengjie; Zhong, Liyun; Liu, Shengde; Lu, Xiaoxu
- Abstract
In phase-shifting interferometry, based on the difference image between interferograms with unknown phase-shifting amount, a rapid phase extraction method is proposed. In this method, first, by means of the simple subtraction operation between interferograms captured in one phase-shifting period, a sequence of difference images are generated easily; second, to decrease the random phase-shifting errors induced during the phase-shifting procedure, the summation operation is performed for these difference images; third, based on one time phase recovery operation and one time phase-unwrapping operation, the measured phase with high precision can be obtained rapidly. Moreover, in the proposed method, by means of a simple phase summation operation for all pixel-phases in one interferogram, the corresponding phase-shifting amount of interferogram can be determined conveniently.
- Subjects
PHASE-shifting interferometry; PHASE unwrapping (Digital image processing); PHASE shift (Nuclear physics); OPTICAL instruments; OPTICAL measurements; INTERFEROMETRY
- Publication
Applied Physics B: Lasers & Optics, 2012, Vol 108, Issue 4, p793
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-012-5195-2