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Proceedings Paper

Time-encoded WDM technique for multiple Bragg grating sensors interrogation
Author(s): C. C. Kato; Luiz C. G. Valente; B. S. Olivieri; A. M. B. Braga; A. L. C. Triques; A. S. Ribeiro
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Paper Abstract

This work presents a system for the interrogation of optical fiber Bragg grating sensors based on time domain reflectometry and fixed filters. In this system, filtering is accomplished by fiber Bragg gratings, and a pulsed broadband light source is employed to illuminate the gratings. The spectral informations from the sensors are related to the ratio of two pulse intensities, each from a different filter. The signals are measured with a unique photodetection system, which makes detection independent of intensity variations and minimizes external influences on the circuit, such as variations in the environment temperature. Also, a small number of optical couplers and circulators are needed, so the interrogation system costs per sensor is considerably reduced. A test approach has been assembled for the interrogation of six sensors. Comparisons between experimental results and simulations show a good agreement. Extrapolations indicate that it would be possible to interrogate sensors with spectral variations up to 2 nm, providing uncertainties smaller than 5 pm, which is adequate for multiplexed sensing of temperature in a range of 200°C.

Paper Details

Date Published: 23 May 2005
PDF: 4 pages
Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); doi: 10.1117/12.623805
Show Author Affiliations
C. C. Kato, Gavea Sensors (Brazil)
Luiz C. G. Valente, Gavea Sensors (Brazil)
B. S. Olivieri, Gavea Sensors (Brazil)
A. M. B. Braga, Pontificia Univ. Catolica do Rio de Janeiro (Brazil)
A. L. C. Triques, Pontificia Univ. Catolica do Rio de Janeiro (Brazil)
A. S. Ribeiro, Pontificia Univ. Catolica do Rio de Janeiro (Brazil)

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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