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Proceedings Paper

Simple tunable pulsed laser system for quasi-distributed sensors
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Paper 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.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75031T (5 October 2009); doi: 10.1117/12.835464
Show Author Affiliations
C. C. Kato, Catholic Univ. of Rio de Janeiro (Brazil)
A. M. B. Braga, Catholic Univ. of Rio de Janeiro (Brazil)
A. S. Ribeiro, Catholic Univ. of Rio de Janeiro (Brazil)
L. C. G. Valente, Lupatech Monitoring Systems (Brazil)
S. R. K. Morikawa, Petrobras Research Ctr. (Brazil)

Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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