Packaged FBG temperature sensor with two connectors is easily affected by exterior load on transmitting line to result in measuring errors.In order to solving this problem

aiming at prototype and sensitivity-increasing

new package techniques for FBG temperature sensors without load affection are put forward respectively.The experiments of sensitivity calibration and loading affection are carried out under 5

9

5 ℃.And effects on the sensing properties of packaged FBG temperature sensors filled with or without good thermal transfer material are also compared.The results show that the linearity of packaged FBG temperature sensors is good

and the correlation coefficient is above 0.999.The sensitivity coefficients of prototype-packaged FBG temperature sensor and sensitivity-increa

sing packaged FBG temperature sensor are 1 and 2.86 times of that of the bare FBG respectively.The packaged FBG temperature sensor filled with thermal transfer material can sense the temperature easier than the others

while the temperature-sensing coefficient keeps the same.Moreover

the packaged FBG temperature sensor’s wavelength is not changed under load of 80 N when the environment temperature keeps the same.