Digital multiple wavelength phase shifting algorithm

Song Zhang

doi:10.1117/12.823903

10 September 2009 Digital multiple wavelength phase shifting algorithm

Song Zhang

Proceedings Volume 7432, Optical Inspection and Metrology for Non-Optics Industries; 74320N (2009) https://doi.org/10.1117/12.823903
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

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 λ_κ = W/2^κ-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, Φ_k-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.

Citation Download Citation

Song Zhang "Digital multiple wavelength phase shifting algorithm", Proc. SPIE 7432, Optical Inspection and Metrology for Non-Optics Industries, 74320N (10 September 2009); https://doi.org/10.1117/12.823903

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