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Proceedings Paper

Digital multiple wavelength phase shifting algorithm
Author(s): Song Zhang
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Paper Abstract

This paper presents a digital multiple-wavelength phase-shifting technique for three-dimensional shape measurement. The projected phase-shifted fringe images have wavelengths of λκ = W/2κ-1 (k = 1,2,3...). The phase unwrapping is not needed for the longest wavelength because a single fringe covers the whole area. The shorter wavelength phase, φκ(x,y), is unwrapped by referring to the previously unwrapped longer wavelength phase, Φk-1(x,y), pixel by pixel without accessing its neighborhood pixels. Experiments demonstrate that this technique has low noise and less sensitivity to motion. It can be used to measure arbitrary step height and multiple objects simultaneously.

Paper Details

Date Published: 10 September 2009
PDF: 11 pages
Proc. SPIE 7432, Optical Inspection and Metrology for Non-Optics Industries, 74320N (10 September 2009); doi: 10.1117/12.823903
Show Author Affiliations
Song Zhang, Iowa State Univ. (United States)

Published in SPIE Proceedings Vol. 7432:
Optical Inspection and Metrology for Non-Optics Industries
Peisen S. Huang; Toru Yoshizawa; Kevin G. Harding, Editor(s)

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