Interferometry

Phase unwrapping error reduction framework for a multiple-wavelength phase-shifting algorithm

[+] Author Affiliations
Song Zhang

Iowa State University, Department of Mechanical Engineering, Virtual Reality Applications Center, Human Computer Interaction, Ames, Iowa 50011

Opt. Eng. 48(10), 105601 (October 23, 2009). doi:10.1117/1.3251280
History: Received July 06, 2009; Accepted August 24, 2009; Published October 23, 2009
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We address a framework to reduce the unwrapping errors of the measurement system using a digital multiple-wavelength phase-shifting algorithm. In particular, the following framework is proposed: (1) smooth the raw phase by smoothing the sine and cosine images of the phase computation of the inverse tangent function; (2) locate and remove the incorrectly unwrapped points by the monotonicity condition of the phase map; (3) obtain the unwrapped phase map for the shortest wavelength without smoothing; (4) detect holes and fill them to preserve as much useful information as possible. Experiments demonstrated that the proposed framework significantly alleviated the measurement errors caused by the phase noise.

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© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Song Zhang
"Phase unwrapping error reduction framework for a multiple-wavelength phase-shifting algorithm", Opt. Eng. 48(10), 105601 (October 23, 2009). ; http://dx.doi.org/10.1117/1.3251280


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