A Phase Modulated Optical Heterodyne Interferometer to Detect VLF Vibrations
- 1 August 1980
- journal article
- research article
- Published by Taylor & Francis in Optica Acta: International Journal of Optics
- Vol. 27 (8) , 1253-1262
- https://doi.org/10.1080/713820372
Abstract
A new method to measure subsonic vibrations of very small amplitude is presented. It makes use of an interferometric system plus a phase modulation of the laser light source. The accuracy is limited only by the shot noise of the laser. Some considerations are reported concerning the frequency spectrum of the signal and the signal to noise ratio. The experimental results show a good agreement with theory.Keywords
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