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Optical Engineering

Phase-shifting moiré interferometry based on a liquid crystal phase modulator
Author(s): Horng-Jou Wang; Jiun-Yeu Chen; Chiaming Liu; Lien-Wen Chen
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Paper Abstract

A new method for phase-shifting moiré interferometry is proposed and studied experimentally. A nematic liquid crystal cell is employed as a phase modulator to realize the phase-shifting technique for the conventional moiré interferometry. The phase retardation of the liquid crystal cell is calibrated by measuring transmitted light intensities. By letting one of coherent beams pass through a liquid crystal cell and controlling the phase retardation via suitable voltages across the cell, the phase map that provides quantitative data regarding the in-plane surface displacement can be created. The use of the liquid crystal phase modulator in the moiré optical arrangement has several advantages over alternative methods.

Paper Details

Date Published: 1 January 2005
PDF: 6 pages
Opt. Eng. 44(1) 015602 doi: 10.1117/1.1828472
Published in: Optical Engineering Volume 44, Issue 1
Show Author Affiliations
Horng-Jou Wang, National Cheng Kung Univ. (Taiwan)
Jiun-Yeu Chen, National Cheng Kung Univ. (Taiwan)
Chiaming Liu, National Cheng Kung Univ. (Taiwan)
Lien-Wen Chen, National Cheng Kung Univ. (Taiwan)

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