A Novel High-sensitivity Fiber Bragg Grating Temperature Sensor

A high-sensitivity fiber Bragg grating(FBG) temperature sensor which uses the principle of strain changing of the FBG with the closed air pressure was designed.Its temperature sensitivity is up to 0.474 nm/℃,and the temperature coefficient is 3.062×10~(-4)/℃,which is about 45.9 times of bare FBG,and the linearity of the sensitivity is 0.998 8.It is the highest sensitivity ever reported and the temperature sensitivity can be adjusted by changing relative parameters.