17 January 2008 Three-dimensional profile measurement of steep object by optical fiber frequency mixing fringe projection technology
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Proceedings Volume 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 672348 (2008); doi: 10.1117/12.783624
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China
Abstract
Based on the theory of Fourier transformation profilometry(FTP), a novel profile measurement of steep object using fiber frequency mixing projection is proposed. With this method, optical fiber frequency mixing interference fringes are acquired through three optical fibers interference. It is made of three sets fringes with different spatial frequency. The spatial frequency of the interference stripes is changed through changing the spacing of the optical fiber end. The new three- optical- fiber frequency mixing profilometry only needs one frame of image to demodulate phase. Two deforming fringes with different frequency are captured at the same time. The surface range of the object is detected by the low frequency fringes. The precision depends on high frequency fringes. Finally, the exact profile of steep object is detected by data fusion. In the paper, a multi-functional projector is designed. Theory and experiment research are done to verify this novel method. Experimental results show that the method features accurate phase unwrapping with extensive measurement range.
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Xiaoyan Lin, Libo Yuan, "Three-dimensional profile measurement of steep object by optical fiber frequency mixing fringe projection technology", Proc. SPIE 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 672348 (17 January 2008); doi: 10.1117/12.783624; https://doi.org/10.1117/12.783624
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KEYWORDS
Optical fibers

Projection systems

Charge-coupled devices

3D metrology

Spatial frequencies

Data fusion

Fiber couplers

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