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An Improved Composite Grating for Phase Unwrapping in 3-D Measurement of Specular Objects

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Abstract:

The paper proposes a novel method of improving the traditional composite grating in 3-D measurement of the specular objects. The traditional composite grating is improved by altering the intensity of the center stripe in one of the fringes. The improved composite grating not only includes the primary phase information, which is modulated by the object's surface, but also includes the code information, which is necessary for the phase unwrapping. The paper introduces the formation of the improved composite grating, demodulating the composite grating and computing the unwrapped phase based on the altered fringe. Simulated and actual experiments prove that this method is valid. Because of projecting a single composite grating, the method is suitable for dynamical measurement.

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Periodical:

Advanced Materials Research (Volumes 468-471)

Pages:

753-757

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.468-471.753

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Online since:

February 2012

Authors:

Shu Gui Liu, Li Shuan Ji, Shu Jian Han, Xiao Jie Zhang, Hong Wei Zhang

Keywords:

3-D Shape Measurement, Composite Grating, Dynamical Measurement, Phase Unwrapping, Specular Reflection

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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