Dynamic two-beam speckle interferometry

Mansour A. Ahmadshahi; Sridhar Krishnaswamy; Siavouche Nemat-Nasser

doi:10.1117/12.49505

1 December 1991 Dynamic two-beam speckle interferometry

Mansour A. Ahmadshahi, Sridhar Krishnaswamy, Siavouche Nemat-Nasser

Proceedings Volume 1554, Second International Conference on Photomechanics and Speckle Metrology; (1991) https://doi.org/10.1117/12.49505
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

The feasibility of two-beam speckle interferometry for the study of time-varying mechanical deformation of diffusely reflecting bodies is demonstrated. A sequence of speckle patterns produced by a vibrating cantilever beam was recorded photographically by means of a high-speed camera. These speckle photographs were subsequently digitized using a CCD camera for input into an image processing computer. By gray-level subtraction of carefully registered pairs of speckle images, fringes corresponding to the relative surface displacements were obtained. A sequence of these fringe patterns was reconstructed to obtain the time-history of deformation. These are compared with time-frozen (strobed) patterns for the same body.

Citation Download Citation

Mansour A. Ahmadshahi, Sridhar Krishnaswamy, and Siavouche Nemat-Nasser "Dynamic two-beam speckle interferometry", Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); https://doi.org/10.1117/12.49505

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