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Proceedings Paper

Advances in Brillouin-based distributed optical fiber temperature sensing
Author(s): Yongqian Li; Fucai Zhang; Yujun He; Zhi Yang; Toshihiko Yoshino
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Paper Abstract

This paper demonstrates the recent achievements in the field of Brillouin based distributed optical fiber temperature sensing. When a dispersion-shifted fiber was subjected to a temperature cycle between 20 and 820 °C, the Brillouin shift exhibited an undesired hysteresis with a maximum frequency discrepancy of larger than 48 MHz between heating and cooling processes. After the fiber was annealed for 9 h at 850 °C, however, the hysteresis almost disappeared for repeated temperature cycles in the ranges of 20-820 °C and of 500-800 °C with deviations of the measurements from the best-fit curve of less than ±12.5MHz. The temperature dependence of Brillouin shift in the range of 20-820 °C in the annealed fiber was well expressed by a second order function of temperature. A sensing scheme that utilizes both output signals of the fiber Mach-Zehnder interferometer used as an optical frequency discriminator has been proposed. The scheme that has the advantages of less system adjustment and fast measurement, combined with a suitably annealed fiber, offers a reliable means for the Brillouin shift-based distributed sensing over the wide temperature range.

Paper Details

Date Published: 14 February 2005
PDF: 9 pages
Proc. SPIE 5634, Advanced Sensor Systems and Applications II, (14 February 2005); doi: 10.1117/12.575896
Show Author Affiliations
Yongqian Li, North China Electric Power Univ. (China)
Fucai Zhang, North China Electric Power Univ. (China)
Yujun He, North China Electric Power Univ. (China)
Zhi Yang, North China Electric Power Univ. (China)
Toshihiko Yoshino, Kaisei Academy (Japan)

Published in SPIE Proceedings Vol. 5634:
Advanced Sensor Systems and Applications II
Yun-Jiang Rao; Osuk Y. Kwon; Gang-Ding Peng, Editor(s)

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