Phase distortion removing in fringe projection using windowed Fourier transform

Hong Miao; Qiang Lu; Chong Yang; Jing Zhao

doi:10.1117/12.839222

24 August 2009 Phase distortion removing in fringe projection using windowed Fourier transform

Hong Miao, Qiang Lu, Chong Yang, Jing Zhao

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73752L (2009) https://doi.org/10.1117/12.839222
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

The analysis of the phase distortion in fringe projection with phase shifting is described. A phase distortion is induced when phase shifting method is applied to extract the phase values from the projected fringe patterns in surface contouring. The phase distortion will affect the measurement results especially with measurement of micro-components. The cause of phase distortion is analyzed and its influence on the measurement of micro-component is discussed. In order to remove the phase distortion, a Windowed Fourier Transform (WFT) is employed to extract the phase information from contour measurement. The advantage of WFT phase extraction over the conventional phase shifting method is that WFT can overcome the phase distortion in phase extraction. The principle of the proposed WFT phase extraction method is described and experiment is conducted to measure the surface profile of a micro-component. It is shown that by the use of WFT phase extraction method the phase distortion induced in the conventional phase-shifting technique can be completely eliminated.

Citation Download Citation

Hong Miao, Qiang Lu, Chong Yang, and Jing Zhao "Phase distortion removing in fringe projection using windowed Fourier transform", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73752L (24 August 2009); https://doi.org/10.1117/12.839222

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