25 April 1990 Measurement Of Vibration Patterns Using Electro-Optic Holography
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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.
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Ryszard J. Pryputniewicz, Ryszard J. Pryputniewicz, Karl A. Stetson, 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); doi: 10.1117/12.962774; https://doi.org/10.1117/12.962774
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