Special Ronchi grating as the shearing element of shearing ESPI for nondestructive testing

Xiaoping Wu; Shaojun Fu; Lin-yong Pang

doi:10.1117/12.269865

20 March 1997 Special Ronchi grating as the shearing element of shearing ESPI for nondestructive testing

Xiaoping Wu, Shaojun Fu, Lin-yong Pang

Proceedings Volume 2921, International Conference on Experimental Mechanics: Advances and Applications; (1997) https://doi.org/10.1117/12.269865
Event: International Conference on Experimental Mechanics: Advances and Applications, 1996, Singapore, Singapore

Abstract

A new electronic shearing speckle pattern interferometry using a special Ronchi grating as the shearing element has been developed and applied to deformation measurement and non destructive testing (NDT) in the practical environment. This special designed Ronchi grating is a kind of phase grating. It can make zero order and all even order beams disappear and among all odd order beams the +/- 1 order beams are much stronger than others. This new shearing element has many advantages, such as small volume, light weight, lower price, lower energy lost and good quality of shearing image. The experimental results show that it is good at electronic shearography.

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Xiaoping Wu, Shaojun Fu, and Lin-yong Pang "Special Ronchi grating as the shearing element of shearing ESPI for nondestructive testing", Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); https://doi.org/10.1117/12.269865

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KEYWORDS

Diffraction gratings

Diffraction

Ronchi rulings

Shearography

Image quality

Nondestructive evaluation

Fringe analysis

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