Simple tunable pulsed laser system for quasi-distributed sensors

C. C. Kato; A. M. B. Braga; A. S. Ribeiro; L. C. G. Valente; S. R. K. Morikawa

doi:10.1117/12.835464

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5 October 2009 Simple tunable pulsed laser system for quasi-distributed sensors

C. C. Kato, A. M. B. Braga, A. S. Ribeiro, L. C. G. Valente, S. R. K. Morikawa

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Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75031T (2009) https://doi.org/10.1117/12.835464
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

Abstract

A simple interrogation system for semi-distributed fiber Bragg grating (FBG) sensor array with a tunable pulsed laser is demonstrated. The pulsed light source is used to discriminate, in space or in time, the FBG position. The sensor array can then be constituted with low reflectivity FBG (<5%) and with the same wavelength (the FBGs have to be spatially separated). This improvement increases the capacity of the tunable pulsed laser system interrogation, which can reach up to 1000 sensors in one single fiber. The signals are measured with only one photodetection system, which makes detection less dependent of intensity variations and minimizes external influences on the circuit, such as variations in the environment temperature. A test approach has been assembled for the interrogation of five sensors in the same fiber, varying its reflectivity from 0.8% to 1.6% and with the same nominal wavelength.

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C. C. Kato, A. M. B. Braga, A. S. Ribeiro, L. C. G. Valente, and S. R. K. Morikawa "Simple tunable pulsed laser system for quasi-distributed sensors", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75031T (5 October 2009); https://doi.org/10.1117/12.835464

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