Description of a coherent light technique to detect the tangential and radial vibrations of an arch dam

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Abstract

This paper describes a technique in which a laser light vibration sensor based on a Michelson interferometer is used. With a 5 mW laser the instrument will make measurements on a moving target at ranges greater than 200 m without using retro-reflective materials. Careful optimization of the electro-optic design reduces the effects of environmental disturbances and allows vibration amplitude resolution of 0·2 μm with a flat response in the bandwidth 0·1-150 Hz. Field tests and actual measurements of the radial and tangential displacements of an arch dam are shown. © 1982.

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Corti, M., Parmigiani, F., & Botcherby, S. C. L. (1982). Description of a coherent light technique to detect the tangential and radial vibrations of an arch dam. Journal of Sound and Vibration, 84(1), 35–45. https://doi.org/10.1016/0022-460X(82)90430-8

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