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Proceedings Paper

A Fibre-Optic Non-Contacting Reference Grade Vibration Sensor
Author(s): B. T. Meggitt; A. C. Lewin; D. A. Jackson
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Paper Abstract

A non-contacting optical vibration sensor has been developed using a fibre-optic system that is suitable for use as a reference grade device. It is based around a fibre Michelson interferometer configuration in which an optical carrier is produced by imposing a sinusoidal phase modulation of specific amplitude in the interferometer and electronically gating and bandpass filtering the resulting output signal. In order to achieve a primary reference grade sensor, the carrier modulation induced by the vibrating surface is demodulated in the phase domain using a digital phase-tracker, and the time dependence of the surface displacement is recovered relative only to the wavelength of radiation used.

Paper Details

Date Published: 29 October 1989
PDF: 9 pages
Proc. SPIE 1120, Fibre Optics '89, (29 October 1989); doi: 10.1117/12.961000
Show Author Affiliations
B. T. Meggitt, Sira Ltd (United Kingdom)
A. C. Lewin, University of Kent (United Kingdom)
D. A. Jackson, University of Kent (United Kingdom)


Published in SPIE Proceedings Vol. 1120:
Fibre Optics '89

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