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Optical Engineering

Equidistant fringe phase shift measurement by use of a trough integration method
Author(s): Qijie Wang; Xiaowei Sun; Xi Jiang Yin
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Paper Abstract

A data processing method that extracts phase information through the integration of the trough part of the equidistant fringes was used in a phase shift measurement system based on a Michelson interferometer and a linear photo detector. The advantage of this method is substantiated theoretically and experimentally. The thermal drift and nonthermal drift of the system were observed and discussed. After deducting the error caused by the drifts, a 0.12-nm standard deviation was achieved in the displacement measurement with a movement range of several tens of nanometers. The measurement results of an antiparallel-aligned nematic liquid crystal (LC) cell and a polymer-dispersed liquid crystal (PDLC) cell by use of this system are also presented.

Paper Details

Date Published: 1 November 2008
PDF: 8 pages
Opt. Eng. 47(11) 115601 doi: 10.1117/1.3028281
Published in: Optical Engineering Volume 47, Issue 11
Show Author Affiliations
Qijie Wang, Nanyang Technological Univ. (Singapore)
Xiaowei Sun, Nanyang Technological Univ. (Singapore)
Xi Jiang Yin, Singapore Polytechnic (Singapore)


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