Accurate shape measurement for cylindrical object by phase-shifting method using Fourier transform

Motoharu Fujigaki; Yoshiharu Morimoto

doi:10.1117/12.269876

20 March 1997 Accurate shape measurement for cylindrical object by phase-shifting method using Fourier transform

Proceedings Volume 2921, International Conference on Experimental Mechanics: Advances and Applications; (1997) https://doi.org/10.1117/12.269876
Event: International Conference on Experimental Mechanics: Advances and Applications, 1996, Singapore, Singapore

Abstract

Automatic non-contacting shape measurement using grid projection methods is often used as monitoring system for protection against disaster. Both high accurate phase analysis of grids and high accurate geometric parameters of the optical system are necessary for accurate shape measurement. We have been proposing the phase shifting method using Fourier transform (PSM/FT) and a method to obtain geometric parameters without influence of lens aberrations. The PSM/FT is most insensitive to noise in phase-shifting methods. In the case of a cylindrical object, a contour map is directly obtained by projecting a grid to the object and gathering the images taken by a line sensor with rotating the object. The phase of the contour map is shifted with shifting the projected grid phase. The shape can be obtained with high accuracy using the above method. In this paper, the principle of the method and an application are shown.

Citation Download Citation

Motoharu Fujigaki and Yoshiharu Morimoto "Accurate shape measurement for cylindrical object by phase-shifting method using Fourier transform", Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); https://doi.org/10.1117/12.269876

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