Measurement Of Vibration Patterns Using Electro-Optic Holography

Ryszard J. Pryputniewicz; Karl A. Stetson

doi:10.1117/12.962774

25 April 1990 Measurement Of Vibration Patterns Using Electro-Optic Holography

Ryszard J. Pryputniewicz, Karl A. Stetson

Proceedings Volume 1162, Laser Interferometry: Quantitative Analysis of Interferograms: Third in a Series; (1990) https://doi.org/10.1117/12.962774
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

Abstract

This paper describes the use of an Electro-Optic Holography system for measuring vibration patterns on diffusely reflecting objects. The system provides a high-quality display of fringes for identifying modal frequencies and setting vibration levels after which image brightness data can be transferred to a host computer. A bias vibration is introduced into the illumination beam to shift the 0 fringes so that fringe shift algorithms can be used to determine vibration amplitude. Using this approach, high spatial density displacement fields for vibrating objects were obtained directly form the time-average interferograms recorded by the Electro-Optic Holography system. These results show good correlation with the reconstructions from the holograms and with the vibration characteristics predicted by the Finite Element Methods.

Citation Download Citation

Ryszard J. Pryputniewicz and Karl A. Stetson "Measurement Of Vibration Patterns Using Electro-Optic Holography", Proc. SPIE 1162, Laser Interferometry: Quantitative Analysis of Interferograms: Third in a Series, (25 April 1990); https://doi.org/10.1117/12.962774

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