Aiming at problem that temperature sensor based on electrical signal transmission is difficult to perform detection in high-risk environment such as petroleum

chemical

substations and so on

design a gas pressure type fiber Bragg grating（ FBG） temperature sensor. The sensor uses gas pressure type structure

pastes two FBG with same sensitivity coefficients on the central axis of upper and lower surfaces of equi-intensity cantilever beam

analyze principle of temperature sensor

build up its theoretical mathematical model

and assemble the sensor.Through temperature ramp test on gas pressure fiber Bragg grating sensor

get static characteristics of the sensor as follows: the linearity of the sensor is 3. 59 % FS

the heating process sensitivity is 10. 14 pm/℃

the cooling process sensitivity is 9. 99 pm/℃.