Temporal wavelet analysis for deformation measurement of small components using micro-ESPI

Yu Fu; Cho Jui Tay; Chenggen Quan; Lujie J. Chen

doi:10.1117/12.621664

12 April 2005 Temporal wavelet analysis for deformation measurement of small components using micro-ESPI

Yu Fu, Cho Jui Tay, Chenggen Quan, Lujie J. Chen

Proceedings Volume 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics; (2005) https://doi.org/10.1117/12.621664
Event: Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, 2004, -, Singapore

Abstract

Measuring continuous deformation of specimens whose dimensions are in the range of sub-millimeter introduces a number of difficulties using laser speckle interferometry. During deformation, the speckle patterns recorded on a camera sensor change constantly. These time-dependent speckle patterns would provide the deformation history of the object. However, compared to large objects, noise effect is much more serious due to the high magnification. In this study, a series of speckle patterns on small objects are captured during deformation by high speed camera and the temporal intensity variation of each pixel is analyzed by a robust mathematical tool --- complex Morlet wavelet transform instead of conventional Fourier transform. The transient velocity and displacement of each point can be retrieved without the need for temporal or spatial phase unwrapping process. Displacements obtained are compared with those from temporal Fourier transform, and the results show that wavelet transform minimize the influence of noise and provide better results.

Citation Download Citation

Yu Fu, Cho Jui Tay, Chenggen Quan, and Lujie J. Chen "Temporal wavelet analysis for deformation measurement of small components using micro-ESPI", Proc. SPIE 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, (12 April 2005); https://doi.org/10.1117/12.621664

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