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Optical Engineering

Three-dimensional displacement measurement by using reversed phase-shifting electronic speckle pattern interferometry
Author(s): Ping Sun
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Paper Abstract

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.

Paper Details

Date Published: 1 September 2006
PDF: 5 pages
Opt. Eng. 45(9) 093602 doi: 10.1117/1.2349530
Published in: Optical Engineering Volume 45, Issue 9
Show Author Affiliations
Ping Sun, Shandong Normal Univ. (China)


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