An optimum design of high sensitivity PMMA-coated FBG sensor for temperature measurement

Fiber Bragg grating (FBG) with silica material has limitations in measuring mechanical quantities such as strain and temperature, this happens because fibers are easy to break at higher transverse or axial strains. This deficiency can be overcome several ways, one of which is by coating the FBG a made metal polymer. In research, sensor been designed poly methyl methacrylate (PMMA)-coated silica. The finite element method (FEM) used analyze electric field distribution on surface PMMA coated thickness 20 µm. Furthermore, sensitivity each temperature was measured range 25 ℃ 85 using coupled mode theory (CMT). From design analysis FBG, it found that had highest 395.73pm/℃. However, 13.73 pm/℃. shift obtained also linear along ℃.