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Proceedings Paper

Distributed Brillouin temperature measurements without frequency scanning for dymanic process monitoring
Author(s): Graham A. Ferrier; Xiaoyi Bao; Lufan Zou; Liang Chen
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Paper Abstract

Distrbuted Brillouin intensity vs. temperature measurements along an optical fiber are studied theoretically and experimentally using counter-propagating laser beams interacting at a fixed beat frequency. By monitoring the Brillouin temperature spectrum without scanning the beat frequency, one can acquire distributed temperature measurements within seconds rather than minutes, making this acquisition method suitable for dynamic processes such as hot spots and fire detection. This technique requires knowledge of a threshold temperature condition, which is mathematically derived by considering the temperature dependence on Brillouin peak power and linewidth in the frequency domain. Temperature varying fiber regions are monitored using 0.2 and 2 m spatial resolutions along 2 and 11 km fiber lengths respectively.

Paper Details

Date Published: 20 July 2004
PDF: 10 pages
Proc. SPIE 5393, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites III, (20 July 2004); doi: 10.1117/12.548107
Show Author Affiliations
Graham A. Ferrier, Univ. of Ottawa (Canada)
Xiaoyi Bao, Univ. of Ottawa (Canada)
Lufan Zou, Univ. of Ottawa (Canada)
Liang Chen, Univ. of Ottawa (Canada)


Published in SPIE Proceedings Vol. 5393:
Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites III
Peter J. Shull; Andrew L. Gyekenyesi, Editor(s)

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