Self-referencing fibre-optic intensity strain sensors

J. Montalvo; Pedro C. Lallana; C. Vazquez

doi:10.1117/12.623597

23 May 2005 Self-referencing fibre-optic intensity strain sensors

J. Montalvo, Pedro C. Lallana, C. Vazquez

Author Affiliations +

Proceedings Volume 5855, 17th International Conference on Optical Fibre Sensors; (2005) https://doi.org/10.1117/12.623597
Event: 17th International Conference on Optical Fibre Sensors, 2005, Bruges, Belgium

Abstract

A theoretical and experimental study of a Radio-Frequency (RF) Ring Resonator (RR) configuration for self-referencing and improving the sensitivity of fibre-optic intensity sensors (FOS) is reported. An experimental set-up directly applying this scheme to a multimode (MM) fibre strain sensor is shown and discussed, and a generic calibration using a single-mode (MM) optical attenuator has also been reported in order to show the principle of operation and to validate the theoretical expressions. The separation between lead and transducer losses in the FOS is solved by converting light intensity fluctuations to be measured into ring resonator losses that produce high amplitude variations in the proximity of the RR resonance frequencies. Modulation of the optical carrier by a RF signal allows using cheap sources and simplifying the detection electronics.

Citation Download Citation

J. Montalvo, Pedro C. Lallana, and C. Vazquez "Self-referencing fibre-optic intensity strain sensors", Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); https://doi.org/10.1117/12.623597

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