Analysis of High Temperature Monitoring Using Fiber Bragg Grating Sensor

Abstract

Measuring the temperature in high temperature industrial application is an important factor and a challenging part where sensors need to withstand high temperature without destruction. Temperature measurement and monitoring in the industries are necessary to ensure correct and accurate operation of the equipment. In these high temperature application conventional electronic sensors like thermocouple, bimetal switches etc cannot withstand high temperature, malfunction due to overheating and also easily pick up Electromagnetic Interference (EMI). In this paper these conventional sensors are replaced by Fiber Bragg Grating (FBG) sensors which is based on the principle of measurement of reflected Bragg’s wavelength and the corresponding shift in the wavelength for the temperature sensed. Advantages of FBG sensors for temperature measurement is that its light weight, small size, flexibility, non interfering, low loss, long range sensing(remote sensing), multiplexing capabilities, withstands high temperature. In this paper the simulation of 2D and 3D model is done using the Comsol software and also the experiment is performed for FBG temperature sensors to depict the shift in Bragg’s wavelength that can be used in high temperature monitoring in oil wells, high temperature optical sensing in gas turbines, widely used in nuclear reactors which has elevated temperature and high levels of electromagnetic interference (EMI)..