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Appl Opt. 2004 May 1;43(13):2695-702.

Windowed Fourier transform for fringe pattern analysis.

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1
School of Computer Engineering, Nanyang Technological University, Singapore 639798. mkmqian@ntu.edu.sg

Abstract

Fringe patterns in optical metrology systems need to be demodulated to yield the desired parameters. Time-frequency analysis is a useful concept for fringe demodulation, and a windowed Fourier transform is chosen for the determination of phase and phase derivative. Two approaches are developed: the first is based on the concept of filtering the fringe patterns, and the second is based on the best match between the fringe pattern and computer-generated windowed exponential elements. I focus on the extraction of phase and phase derivatives from either phase-shifted fringe patterns or a single carrier fringe pattern. Principles as well as examples are given to show the effectiveness of the proposed methods.

PMID:
15130009
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