1 April 2004 Small amplitude estimation of mechanical vibrations using electronic speckle shearing pattern interferometry
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Optical Engineering, 43(4), (2004). doi:10.1117/1.1666858
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.
F. J. Casillas, Abundio Davila-Alvarez, Steve J. Rothberg, G. Garnica, "Small amplitude estimation of mechanical vibrations using electronic speckle shearing pattern interferometry," Optical Engineering 43(4), (1 April 2004). http://dx.doi.org/10.1117/1.1666858
JOURNAL ARTICLE
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KEYWORDS
Speckle pattern

Speckle

Mirrors

Fringe analysis

Interferometry

Vibrometry

Interferometers

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