Phase-shifting speckle interferometry: A noise reduction filter for phase unwrapping

被引:34
作者
Capanni, A
Pezzati, L
Bertani, D
Cetica, M
Francini, F
机构
[1] Istituto Nazionale di Ottica, 50125 Florence, Largo Enrico Fermi
[2] Graduate School of Optics, University of Florence
[3] Istituto Nazionale di Ottica, Florence
[4] Ctro. Gino Bozza of Natl. Res. Cncl., Milan
[5] Istituto di Ingegneria Elettronica, University of Florence
关键词
phase unwrapping; digital filters; speckle interferometry;
D O I
10.1117/1.601488
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We present a noise reduction filter for the phase unwrapping of data from phase-shifting speckle pattern interferometry. This filter is effective in reducing the noise in wrapped phase maps without affecting the edges of the phase jumps, so that a simple and fast unwrapping algorithm can be used. We also discuss a data analysis strategy, including a routine for the recovery of unwrapping errors. The filter performance has been evaluated on real data from a fiber optic phase-shifting speckle interferometer, which we built for the analysis of out-of-plane deformations, The phase shifting is introduced by current modulation of the diode laser source. Some results relative to the analysis of very noisy phase measurements are presented. (C) 1997 Society of Photo-Optical Instrumentation Engineers.
引用
收藏
页码:2466 / 2472
页数:7
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