14 April 2010 Effect of load variation and shearing direction on the phase measurement in shearography
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Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 75224W (2010) https://doi.org/10.1117/12.851678
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore
Abstract
The application of laser shearography is becoming an acceptance tools in industrial NDT and material evaluation. The method has an advantage over other techniques due to non-contact real time measurement via a CCD camera. Recent application shows that this technique could offer a quantitative analysis in determining the magnitude of defect and strain of an inspected object. However problem of error in measurement particularly related to the optical phase change is a major concerned, it is known that the magnitude of the optical phase error could be associated with the optical, mechanical and electronics factors. This paper describes the effect of relative maximum phase change difference with load variation for difference shearing amount and the optical phase magnitude change with the change of shearing direction. Experiment used cantilever beam clearly indicated that the error difference with the variation of load applied to a maximum fringe density of 5mm shearing amount provides 6-12% compared with 10-12% of 15mm shearing amount. The phase magnitude changes its sign from negative to positive value in contrary to the direction of upper speckle shearing.
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W. S. Wan Abdullah, "Effect of load variation and shearing direction on the phase measurement in shearography", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75224W (14 April 2010); doi: 10.1117/12.851678; https://doi.org/10.1117/12.851678
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