Small amplitude estimation of mechanical vibrations using electronic speckle shearing pattern interferometry

F. J. Casillas; Abundio Davila-Alvarez; Steve J. Rothberg; G. Garnica

doi:10.1117/1.1666858

1 April 2004 Small amplitude estimation of mechanical vibrations using electronic speckle shearing pattern interferometry

F. J. Casillas, Abundio Davila-Alvarez, Steve J. Rothberg, G. Garnica

Author Affiliations +

Optical Engineering, Vol. 43, Issue 4, (April 2004). https://doi.org/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.

©(2004) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

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

Published: 1 April 2004

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