A compact speckle interferometer for measuring low-amplitude low frequency motion

James P. Ryle; Mohammed Al-Kalbani; Unnikrishnan Gopinathan; Gerard Boyle; Davis Coakley; John T. Sheridan

doi:10.1117/12.781852

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25 April 2008 A compact speckle interferometer for measuring low-amplitude low frequency motion

James P. Ryle, Mohammed Al-Kalbani, Unnikrishnan Gopinathan, Gerard Boyle, Davis Coakley, John T. Sheridan

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Proceedings Volume 6994, Photon Management III; 69940S (2008) https://doi.org/10.1117/12.781852
Event: SPIE Photonics Europe, 2008, Strasbourg, France

Abstract

Contact techniques exist to measure low amplitude low frequency mechanical vibration, however, by mechanically loading the system of interest, they affect the measured results. In this paper, we design a compact non-contact optical fiber speckle interferometer to measure inplane displacements. We implement this under laboratory conditions, and present our calibration results, measuring low-amplitude microvibrations from 0.34 nm to 1.5 μm over a frequency range from 10 Hz to 150 Hz.

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James P. Ryle, Mohammed Al-Kalbani, Unnikrishnan Gopinathan, Gerard Boyle, Davis Coakley, and John T. Sheridan "A compact speckle interferometer for measuring low-amplitude low frequency motion", Proc. SPIE 6994, Photon Management III, 69940S (25 April 2008); https://doi.org/10.1117/12.781852

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