위상이동ESPI를 이용한 미세용접변형 측정에 관한 연구 A Study on Measurement of Micro Weld Deformation by Using PS-ESPI

ESPI is a noncontact, nondestructive and relatively fast inspection method. For these reasons ESPI is being applied as a valuable tool in the nondestructive evaluation of structural components. Phase shifting ESPI is used more effectively than the traditional ESPI because spatial resolution of small object displacements are improved and numerical phase values are obtained for all pixels in the image. Consequently the quantitative measurement of deformation is possible. ESPI fringe patterns are contaminated with high levels of speckle noise. Therefore the phase image is to be smoothed to remove the noise and obtain a better signal-to-noise ratio. In this study, smoothing is done by phase shifting convolution to avoid smoothing errors close to the 2π phase ambiguities in the deformation phase image, and median filter is used as a smoothing filter.
Publisher
대한기계학회
Issue Date
2002-12
Language
KOR
Citation

대한기계학회논문집 A, v.26, no.12, pp.2535 - 2540

ISSN
1226-4873
URI
http://hdl.handle.net/10203/84585
Appears in Collection
ME-Journal Papers(저널논문)
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