On the basis of analyzing the principle of Fiber Bragg Grating（FBG）sensors

a novel FBG magnetic field sensor based on giant magnetostrictive material is designed.A FBG is first stuck to the giant magnetostrictive material and in order to compensate the effects of temperature on the FBG sensor

one end of another FBG is fixed to a plexiglass and kept in a free state.Then the experimental study on the response characteristics of temperature and magnetic field intensity of the designed sensor is performed.In the range of 0

4

0 ℃

the temperature sensitivities of the magnetic field measurement and the FGB temperature compensation are 22 and 9.9pm/℃ respectively.When the magnetic field intensity is 0

1

200 ×10-4 T

the magnetic field detection sensitivity of the sensor is about 1pm/1×10-4 T

the resolution is 1×10-4 T

the linearity is 0.996 3and the stability is about±3×10-4 T.This study results provide a new method for the measurement of weak magnetic fields.