VIBRATION ANALYSIS BY DIGITAL SHEAROGRAPHY

W. Steinchen, G. Kupfer, P. Mäckel

Abstract

Digital Shearography, a laser interferometric technique in conjunction with the digital image processing, has the potential for vibration analysis due to its simple optical system and insensitivy against small rigid body motions. This paper will focus on its recent developments for vibration analysis and for nondestructive testing (NDT) by dynamic (harmonic) excitation. With the introduction of real time observation using automatically refreshing reference frame, both small and large rigid body motions are greatly suppressed. The development of a smaller and more mobile measuring device in conjunction with a user guided comfortable program Shearwin enables the digital shearography to be applied easily as an industrial on line testing tool.

Keywords

digital speckle pattern shearing interferometry, vibration analysis, NDT, time average

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IMEKO-WC-2000-TC20-P587.pdf

DOI

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IMEKO TC

TC20 - Measurements of Energy and Related Quantities

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