Encapsulated FBG temperature sensor without load influence

Common FBG sensor is easily influenced by load while it is used in the rude construction of infrastructures, which can result in errors, even undermine the monitoring system. A new kind of encapsulated FBG temperature sensor without load influence is brought forward. The experiments of sensitivity coefficient calibration arid loading have been carried out. And the sensing properties of such kind of encapsulated FBG temperature sensors filled with and without good thermal transfer material has also been compared. The results show that the temperature-sensing coefficient of the new kind of sensor is almost the same as the bare one and the linearity is 0.999. The encapsulated FBG temperature sensor filled with thermal transfer material can sense the temperature easier than the other ones, and the temperature-seising coefficient keep the same. Moreover, the encapsulated FBG temperature sensor's wavelength is not changed under load of 80 N.