1 January 2005 Phase-shifting moiré interferometry based on a liquid crystal phase modulator
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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.
Horng-Jou Wang, Jiun-Yeu Chen, Chiaming Liu, Lien-Wen Chen, "Phase-shifting moiré interferometry based on a liquid crystal phase modulator," Optical Engineering 44(1), 015602 (1 January 2005). https://doi.org/10.1117/1.1828472
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