Electronic speckle pattern interferometric vibration fringes

Charles Joenathan; Brij M. Khorana

doi:10.1117/12.140959

2 September 1992 Electronic speckle pattern interferometric vibration fringes

Charles Joenathan, Brij M. Khorana

Proceedings Volume 1779, Optical Design and Processing Technologies and Applications; (1992) https://doi.org/10.1117/12.140959
Event: Optical Engineering Midwest 1992, 1992, Chicago, IL, United States

Abstract

In this paper a comparison of different techniques to obtain vibration patterns by phase stepping on an electronic speckle pattern interferometer (ESPI) is made. The theoretical evaluation of the contrast of the fringes shows that the (pi) phase step method gives good contrast; however, the four step method gives the same contrast along with better pictorial representation. Speckle averaging on the other hand also increases the contrast of the fringes apart from smoothing of speckles. Experimental results corroborating the theoretical predictions are also presented.

Citation Download Citation

Charles Joenathan and Brij M. Khorana "Electronic speckle pattern interferometric vibration fringes", Proc. SPIE 1779, Optical Design and Processing Technologies and Applications, (2 September 1992); https://doi.org/10.1117/12.140959

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