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Proceedings Paper

Interferometric fiber optic sensor interrogation system using digital signal processing and synthetic-heterodyne detection
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Paper Abstract

An interrogation system for fiber optic interferometric sensors is presented. The system consists of a digital signal processor, a codec, laser bias and modulation control circuits, an optical receiver and customized software. The system transmits a modulated light signal to the sensing interferometer, demodulates the returning interferometric signal using synthetic-heterodyne detection, while simultaneously relaying control and signal data via PC based software. The system was tested using a low-finesse Fabry-Perot cavity, consisting of a cleaved fiber end and a mirror mounted on a piezoelectric cylinder. The mirror was vibrated using a sinusoidal voltage applied to the piezoelectric cylinder. Using the interrogation systems, successful retrieval of the vibration signal was obtained for vibrating frequencies from 44 Hz to 4.41 kHz.

Paper Details

Date Published: 23 May 2005
PDF: 4 pages
Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); doi: 10.1117/12.623271
Show Author Affiliations
Barry Griffin, Univ. of Limerick (Ireland)
Michael J. Connelly, Univ. of Limerick (Ireland)

Published in SPIE Proceedings Vol. 5855:
17th International Conference on Optical Fibre Sensors
Marc Voet; Reinhardt Willsch; Wolfgang Ecke; Julian Jones; Brian Culshaw, Editor(s)

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