Temperature-Dependent Strain and Temperature Sensitivities of Fused Silica Single Mode Fiber Sensors with Pulse Pre-Pump Brillouin Optical Time Domain Analysis


This paper reports a distributed temperature and strain sensor based on pulse pre-pump Brillouin optical time domain analysis. An uncoated, telecom-grade fused silica single-mode fiber as a distributed sensor was calibrated for its sensitivity coefficients under various strains and temperatures up to 800 °C. The Brillouin frequency of fiber samples changed nonlinearly with temperature and linearly with strain. The temperature sensitivity decreased from 1.113 to 0.830 MHz /°C in the range of 22-800 °C. The strain sensitivity was reduced from 0.054 to 0.042 MHz /με as the temperature increased from 22 to 700 °C and became unstable at higher temperatures due to creep effect. The strain measurement range was reduced from 19 100 to 6000 με in the temperature range of 22-800 °C due to fused silica's degradation. The calibrated fiber optic sensor demonstrated adequate accuracy and precision for strain and temperature measurements and stable performance in heating-cooling cycles. It was validated in an application setting.


Civil, Architectural and Environmental Engineering

Keywords and Phrases

PPP-BOTDA; Calibration; Fiber Optic Sensors; Fused Silica; Optical Pumping; Single Mode Fibers; Strain; Temperature Measurement; Temperature Sensors; Thermal Expansion; Distributed Fiber Optic Sensor; High Temperature; Temperature Sensitivity; Thermo-Mechanical; Time Domain Analysis

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Article - Journal

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© 2016 Institute of Physics Publishing, All rights reserved.

Publication Date

01 Apr 2016