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Optical Engineering

Small amplitude estimation of mechanical vibrations using electronic speckle shearing pattern interferometry
Author(s): F. J. Casillas; Abundio Davila-Alvarez; Steve J. Rothberg; G. Garnica
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Paper Abstract

Electronic speckle shearing pattern interferometry (ESSPI) is a technique that has been used for surface strain and vibration analysis, assuming that simple derivatives are obtained by this technique. However, large shears are usually introduced in the interferometer to increase its sensitivity and to analyze small amplitudes of vibration, limiting this technique to the calculation of approximated derivatives. As strain is related to the exact derivative of the in-plane and out-of-plane deformations, the association with the approximated derivatives can result in reduced accuracy in the quantification of strain. We propose the use of a recently developed phase-recovering technique in stroboscopic ESSPI for improving the overall accuracy of the estimated amplitude of vibration. A successful mode comparison is revealed between a controlled ESSPI experiment with a large shear and finite element (FE) modeling.

Paper Details

Date Published: 1 April 2004
PDF: 8 pages
Opt. Eng. 43(4) doi: 10.1117/1.1666858
Published in: Optical Engineering Volume 43, Issue 4
Show Author Affiliations
F. J. Casillas, Ctr. de Investigaciones en Optica (Mexico)
Abundio Davila-Alvarez, Ctr. de Investigaciones en Optica, A.C. (Mexico)
Steve J. Rothberg, Loughborough Univ. (United Kingdom)
G. Garnica, Ctr. de Investigaciones en Optica (Mexico)

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