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

Barry Griffin; Michael J. Connelly

doi:10.1117/12.623271

23 May 2005 Interferometric fiber optic sensor interrogation system using digital signal processing and synthetic-heterodyne detection

Barry Griffin, Michael J. Connelly

Author Affiliations +

Proceedings Volume 5855, 17th International Conference on Optical Fibre Sensors; (2005) https://doi.org/10.1117/12.623271
Event: 17th International Conference on Optical Fibre Sensors, 2005, Bruges, Belgium

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.

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Barry Griffin and Michael J. Connelly "Interferometric fiber optic sensor interrogation system using digital signal processing and synthetic-heterodyne detection", Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); https://doi.org/10.1117/12.623271

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