Simultaneous monitoring of temperature, pressure, and strain through Brillouin sensors and a hybrid BOTDA/FBG for disasters detection systems

In this study, the authors deal with the problem of simultaneous measurement of temperature, pressure, and strain using novel technologies of optical fibre (OF) sensors. Indeed, they address the problem of early surveillance systems to detect disasters in real-time. Through these sensors, they try to predict prospective and possible disasters (landslides, fire, earthquake etc.). Temperature, pressure, and strain should be simultaneously monitored to prevent betimes any damages. They propose a novel design of disaster system, which is able to measure the variation of temperature, pressure, and strain using optical sensors based on Brillouin scattering, two types of these sensors are discussed Brillouin optical time division reflectometers and Brillouin optical time division analysis (BOTDA). Thus, they indicate the performance of BOTDA sensors on disaster detection systems. However, these sensors cannot measure pressure variation, so they introduce the application of hybrid BOTDA/fibre Bragg grating (FBG) system in order to predict disasters caused by pressure.