Instrumentation, Measurement, and Metrology

Three-dimensional displacement measurement by using reversed phase-shifting electronic speckle pattern interferometry

[+] Author Affiliations
Ping Sun

Shandong Normal University, College of Physics and Electronics, Jinan 250014, China

Opt. Eng. 45(9), 093602 (September 08, 2006). doi:10.1117/1.2349530
History: Received November 07, 2005; Revised February 15, 2006; Accepted February 20, 2006; Published September 08, 2006
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A method for three-dimensional (3D) displacement measurement by separating out-of-plane displacement from in-plane displacement is presented. A reference beam is added to a dual-beam symmetric illumination electronic speckle pattern interferometry (ESPI) system and shared by the two illuminations. The test object is illuminated by the two object beams, respectively. Two phase maps, which include out-of-plane and in-plane displacement, can be obtained by phase-shifting techniques. In order to decrease electronic noises in the phase maps, one of the phase maps is calculated by the reversed phase-shifting method presented. By using inverse phase distribution, out-of-plane displacement can be easily separated from in-plane displacement by subtraction and can greatly decrease electronic noises. The principle of the method is presented and proved by a typical three-point bending experiment. Experimental results are offered.

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© 2006 Society of Photo-Optical Instrumentation Engineers

Citation

Ping Sun
"Three-dimensional displacement measurement by using reversed phase-shifting electronic speckle pattern interferometry", Opt. Eng. 45(9), 093602 (September 08, 2006). ; http://dx.doi.org/10.1117/1.2349530


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