AUTOMATIC DEFORMATION ANALYSIS BY A TV SPECKLE INTERFEROMETER USING A LASER DIODE

被引：59

作者：

KATO, J ^{[1
]}

YAMAGUCHI, I ^{[1
]}

PING, Q ^{[1
]}

机构：

[1] XIAN INST OPT & FINE MECH, DEPT OPT ENGN, SHANXI, PEOPLES R CHINA

来源：

APPLIED OPTICS | 1993年 / 32卷 / 01期

关键词：

ELECTRONIC SPECKLE PATTERN INTERFEROMETRY; INTERFEROMETRY; LASER DIODE; FREQUENCY MODULATION; DEFORMATION MEASUREMENT;

D O I：

10.1364/AO.32.000077

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A phase-shifting TV speckle interferometer is developed by using the frequency modulation capability of a laser diode and is applied to automatic deformation measurements. Temperature modulation is used for generating the frequency shift of a laser diode. We store four speckle interferograms with relative phase differences of pi/2 in a frame grabber by monitoring a phase-shift signal, which is obtained by integrating the fringe intensity over a local window. The optimum size of the local window is examined experimentally. Then, the optimum processing conditions for reducing the speckle noise in interferograms, including an averaging window size, are found. Experimental results of the automatic deformation analysis indicate a displacement accuracy of better than lambda/30.

引用

页码：77 / 83

页数：7

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