Optical fiber frequency shift profilometry

Xiaoyan Lin; Jinhui Cui; Libo Yuan

doi:10.1117/12.783623

27 November 2007 Optical fiber frequency shift profilometry

Xiaoyan Lin, Jinhui Cui, Libo Yuan

Proceedings Volume 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 672347 (2007) https://doi.org/10.1117/12.783623
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China

Abstract

A novel phase demodulation and projector design method for 3D profile measuring is presented. The system employs a LD as a light source and CCD as a detector. LD and small optical fiber space encoding projector is used to make the system tight and convenient. The light is guided into optical fiber by optical fiber coupler. This method is based on two-optical-fiber interference principle. The projector is made up by six single-mode fibers. Six single-mode fibers are ranged closely into right line to form three pairs of coherent light sources. The space length of every pair of optical fibers is different. The ratio of space length is 1:3:5. Three frames of deformed interference pattern with different spatial frequency are produced. The phase can be demodulated through algebraic operation, arc cosine and phase unwrapping of three frames of interferogram. Theoretical model is established for optical 3D measurement. Phase formula and unwrapping method is given. Numerical simulation and experiment results show that this way is feasible.

Citation Download Citation

Xiaoyan Lin, Jinhui Cui, and Libo Yuan "Optical fiber frequency shift profilometry", Proc. SPIE 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 672347 (27 November 2007); https://doi.org/10.1117/12.783623

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