Aiming at the problem that large structural temperature field monitoring

grain depots

petrochemical

pipelines and the need for precise measurement of different temperature range

a new spin range adjustable fiber Bragg grating（FBG） temperature sensor is designed.The encapsulation of metallized FBG welding on new type of packaging substrate enables the sensor to have characteristics of high temperature resistance. Through the finite element analysis

changes in temperature at 100 ℃

package substrate strain is about 0.073×10-6 which is far less than micro strain of the fiber structure itself

solve the cross influence problems of temperature and stress. At the same time

through high temperature resistant vacuum spin type device to adjust the range

in temperature control box

the sensor is tested experimentally. The minimum range precision is about 20 pm/℃. After the result is corrected

the linearity can reach above 0.999 9

and the full scale precision reaches 0.05 %.