Advances in Brillouin-based distributed optical fiber temperature sensing

Yongqian Li; Fucai Zhang; Yujun He; Zhi Yang; Toshihiko Yoshino

doi:10.1117/12.575896

14 February 2005 Advances in Brillouin-based distributed optical fiber temperature sensing

Yongqian Li, Fucai Zhang, Yujun He, Zhi Yang, Toshihiko Yoshino

Proceedings Volume 5634, Advanced Sensor Systems and Applications II; (2005) https://doi.org/10.1117/12.575896
Event: Photonics Asia, 2004, Beijing, China

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.

Citation Download Citation

Yongqian Li, Fucai Zhang, Yujun He, Zhi Yang, and Toshihiko Yoshino "Advances in Brillouin-based distributed optical fiber temperature sensing", Proc. SPIE 5634, Advanced Sensor Systems and Applications II, (14 February 2005); https://doi.org/10.1117/12.575896

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