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Application of Phase-Shifting Method in Speckle Interferomtery to Measurement of Micro-Scale Displacement  

Baek, Tae-Hyun (School of Mechanical Engineering, Kunsan University)
Kim, Myung-Soo (School of Information Engineering, Kunsan National University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.26, no.3, 2006 , pp. 162-168 More about this Journal
Abstract
Speckle interferometry with phase-shifting method has been applied to measurement of micro-scale displacement through optical signal processing. Four-step phase-shifting method by PZT is used to measure out-of-plane displacement in spot-welded cantilever and results of optical experiments are comparable to those of FEM. Phase-shifting method using Fourier transform by PZT is applied to measurement of in-plane displacement on rectangular steel plate with a circular hole. The results of optical experiment agree well with theoretical calculation. New phase-shifting method in speckle interferometry has been implemented with a quarter wave plate. In-plane displacement of specimen is measured by the new phase-shifting method. Results of optical experiment show that the quarter wave plate can be used for phase-shifting method that is cheap and easy to use in speckle interferometry.
Keywords
Speckle Interferometry; Phase-Shifting Method; Measurement of Displacement; Quarter Wave Plate;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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