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Proceedings Paper

Dynamic two-beam speckle interferometry
Author(s): Mansour A. Ahmadshahi; Sridhar Krishnaswamy; Siavouche Nemat-Nasser
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Paper 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.

Paper Details

Date Published: 1 December 1991
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Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); doi: 10.1117/12.49505
Show Author Affiliations
Mansour A. Ahmadshahi, Univ. of California/San Diego (United States)
Sridhar Krishnaswamy, Univ. of California/San Diego (United States)
Siavouche Nemat-Nasser, Univ. of California/San Diego (United States)


Published in SPIE Proceedings Vol. 1554:
Second International Conference on Photomechanics and Speckle Metrology
Fu-Pen Chiang; Fu-Pen Chiang, Editor(s)

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