Recent advancements in fiber Bragg gratings based temperature and strain measurement

Fiber Bragg Gratings or FBGs have achieved significant attention towards sensing and communication applications due to their outstanding advantages. Due to its high sensitivity towards various design parameters, it is now widely used to measure different physical and chemical parameters in various industrial sectors, including harsh environment applications. This review presents a comparative study of different FBG-based temperature and strain sensors reported in recent years. The analytical formulation for such sensors is also presented in brief. Necessary numerical simulation results are incorporated. For FBG based temperature sensors, both low and high range are considered. Similarly, for FBG-based strain sensors, both uniform and non -uniform strain are considered and discussed in brief. Apart from the sensing applications, new variants of FBG like secondary gratings and Random Optical Grating by Ultraviolet or ultrafast laser Exposure (ROGUE) gratings are also discussed.