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  • Open Access

    ABSTRACT

    An Anti-rigid-body Motion Image Processing Method for Electronic Speckle Pattern Interferometry

    Ching-Yuan Chang, Chien-Ching Ma

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.1, pp. 23-24, 2011, DOI:10.3970/icces.2011.018.023

    Abstract Electronic speckle pattern interferometry (ESPI) is a full-field non-contact optical technique for displacement and vibration measurement. This study presents an anti-rigid-body motion (ARM) image processing method to improve the image quality of time-averaged ESPI method. The ARM method is based on the statistical optics and has the ability to reduce the perturbed rigid-body motion and background brightness influence. Finite element method (FEM) is applied to evaluate the resonant frequency and mode shape of piezoelectric ceramics, and compared with experimental measurements. In the resonant frequency comparison, ARM method presents 0.13% and 0.82% discrepancy in the third… More >

  • Open Access

    ABSTRACT

    Study on fracture behaviors of concrete using electronic speckle pattern interferometry and finite element method

    Helen Hongniao Chen1, Ray Kai Leung Su1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.15, No.3, pp. 91-102, 2010, DOI:10.3970/icces.2010.015.091

    Abstract In this study, Electronic Speckle Pattern Interferometry (ESPI) technique was used to measure the surface displacement and strain fields around cracks in concrete beams. ESPI has high accuracy and can determine full-field deformations of concrete. However, tiny rigid-body movements of beam specimens can spoil the ESPI measurement and cause virtual deformations and false strains. Based on the theory of geometrical optics, this paper proposes a method to eliminate the false strains caused by rigid-body motion. The correction procedure was validated experimentally. Furthermore, the crack evolution in a pre-notched beam is presented. The critical minimum crack More >

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