Dynamic Laser Speckle Interferometry Applied To Wave Propagation In Solids

F. P. Chiang

doi:10.1117/12.957591

27 July 1979 Dynamic Laser Speckle Interferometry Applied To Wave Propagation In Solids

F. P. Chiang

Proceedings Volume 0189, 13th Intl Congress on High Speed Photography and Photonics; (1979) https://doi.org/10.1117/12.957591
Event: 13th International Congress on High Speed Photography and Photonics, 1978, Tokyo, Japan

Abstract

When an optically rough surface is illuminated by a laser beam, multiple scattering results in a random inter-pattern called speckles. When these are recorded by double exposure before and after deformation of the surface, interference fringes are obtained upon optical Fourier filtering of the photographic record, and they are indicative of the speckles' spatial displacements. This pheno-menon is exploited in the paper to map stress waves in plates due to transverse and in-plane impact loading. The method of differential speckle interferometry is also introduced which is capable of mapping the particle velocity field of the plate.

Citation Download Citation

F. P. Chiang "Dynamic Laser Speckle Interferometry Applied To Wave Propagation In Solids", Proc. SPIE 0189, 13th Intl Congress on High Speed Photography and Photonics, (27 July 1979); https://doi.org/10.1117/12.957591

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