Distributed Temperature Sensing Using Stimulated-Brillouin-Scattering-Based Slow Light

Abstract

Distributed temperature sensing has been achieved by spatially resolved measurement of the probe time delay resulted from stimulated-Brillouin-scattering slow light. The temperature of a particular fiber section can be monitored by setting an appropriate relative delay between the pump and probe pulses. By controlling the relative delay, we have achieved distributed profiling of the temperature along the whole sensing fiber. This scheme provides an alternative way for distributed temperature sensing with the potential of real-time temperature monitoring. A relatively high-temperature resolution of 0.7 C is obtained.

Review of Fiber Optic Sensors for Structural Fire Engineering

“…ROTDR was operated at temperatures up to 1000 °C with a temperature uncertainty of less than 30 °C [ 115 ]. BOTDA was investigated for measuring temperature distributions in an electric furnace at up to 1000 °C using a fused silica single mode fiber [ 116 , 117 , 118 , 119 , 120 ]. In addition to measuring temperature, Bao and Chen investigated the strain sensing performance of a distributed fiber optic sensor at temperatures up to 800 °C, and temperature dependency of the strain and temperature sensitivity coefficients was quantified using PPP-BOTDA [ 121 ].…”