Three-dimensional shape measurement of specular surfaces by orthogonal composite fringe reflection

Pei Xie; Minxue Tang; Xiaoru Wei

doi:10.1117/12.904805

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28 November 2011 Three-dimensional shape measurement of specular surfaces by orthogonal composite fringe reflection

Pei Xie, Minxue Tang, Xiaoru Wei

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Proceedings Volume 8200, 2011 International Conference on Optical Instruments and Technology: Optoelectronic Imaging and Processing Technology; 820014 (2011) https://doi.org/10.1117/12.904805
Event: International Conference on Optical Instruments and Technology (OIT2011), 2011, Beijing, Beijing, China

Abstract

This paper presents a novel method of 3D shape measurements of specular surfaces, based on fringe reflection technique and Fourier transform profilometry. A simple measurement system is set up. In this system, an LCD screen is used to display orthogonal composite fringe patterns. The fringe patterns reflected by a standard plane mirror and a measured specular surface are captured by a CCD camera. The phase distributions of the fringe patterns would be extracted by using Fourier transform profilometry. Relations between the surface gradients and phase changes in horizontal and vertical directions have been established. Then the shape of the measured surface can be reconstructed from gradient vector field by full-field least square method. The experiment of a concave mirror with a 100-mm diameter proves the validity of this method.

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Pei Xie, Minxue Tang, and Xiaoru Wei "Three-dimensional shape measurement of specular surfaces by orthogonal composite fringe reflection", Proc. SPIE 8200, 2011 International Conference on Optical Instruments and Technology: Optoelectronic Imaging and Processing Technology, 820014 (28 November 2011); https://doi.org/10.1117/12.904805

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