High-resolution projection moiré and its application in out-of-plane displacement test on large area

Jun Yao; Chen Xiong; Hong Miao; Jubing Chen

doi:10.1117/12.2084679

4 March 2015 High-resolution projection moiré and its application in out-of-plane displacement test on large area

Jun Yao, Chen Xiong, Hong Miao, Jubing Chen

Proceedings Volume 9302, International Conference on Experimental Mechanics 2014; 93021Z (2015) https://doi.org/10.1117/12.2084679
Event: International Conference on Experimental Mechanics 2014, 2014, Singapore, Singapore

Abstract

This paper develops a set of projection Moiré system. It projects the grating onto the surface of specimen and forms grid lines of which the pitch is adjustable on large area through light source and projection grating. At the same time, the imaging system images the grid lines precisely onto the reference grating and then the Moiré fringes are formed. The modulation of out-of-plane displacement to grid lines transform into the distortion of Moiré fringes. The greatest advantage of this projection Moiré system is that what the CCD camera captures is the Moiré fringes, not the gird lines. The Moiré fringes can magnify the variation of out-of-plane displacement of the specimen with no distortion and the measuring resolution is improved a lot. Besides, this system is appropriate for large area measurement by using a wide-angle lens in imaging system. The full-field out-of-plane displacement can be acquired through image processing. The measuring resolution of this system can reach 10μm on a large area of 3m*3m.

Citation Download Citation

Jun Yao, Chen Xiong, Hong Miao, and Jubing Chen "High-resolution projection moiré and its application in out-of-plane displacement test on large area", Proc. SPIE 9302, International Conference on Experimental Mechanics 2014, 93021Z (4 March 2015); https://doi.org/10.1117/12.2084679

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