Abstract
Electronic Speckle Pattern Interferometry (ESPI) and Shearography for quantitative analysis of a crack inside of pipelines are described. Shearography is used widely for non‐destructive inspection because of less sensitivity to environmental disturbance and simple interferometer. However, it is difficult to determine the defect size quantitatively because there are so many effect factors‐ shearing distance, shearing direction, and induced load, which depend on operator’s skill and crack information. These effective factors in Shearography are optimized for quantitative analysis and the size of crack is determined. And also, ESPI is used for determination of crack size quantitatively. In ESPI only induced load play an important role and the effective factor is independent on information of a crack. The displacement of object surface is obtained three‐dimensionally and differentiated numerically, which is same to result of Shearography so that crack size can be determined quantitatively without any information of crack.
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