Study on the electric current sensor of fiber Bragg grating

A new electric current sensor based on a fiber Bragg grating tuned by a mag netostrictive material rod was obtained. The fiber Bragg grating was firmly clung on a magnetostrictive rod that was put into the central part of a so lenoid. The rod was elastically lengthened along the direction of the magne tic field, so the Bragg wavelength of the fiber Bragg grating was changed w hen the uniform magnetic field in the solenoid increased. The relationship between the electric current in the solenoid and the change of wavelength i s basically linear. The wavelength range of linear tuning is about 0.9nm, a nd its tuning sensitivity is about 0.001nm/mA.