对一种以磁致伸缩棒调谐光纤布拉格光栅为基础的新型电流传感器进行了理论和实验研究.将一个光纤布拉格光栅牢固地粘贴在一置于多层螺线管中心部分的磁致伸缩棒上,构成传感头.当通过螺线管的电流改变时,磁致伸缩材料在均匀磁场的作用下产生沿纵向的应变并传递到光纤光栅上,从而导致光纤光栅的布拉格波长移动.外加电流和波长移动之间的关系是线性的,线性调谐的波长范围为0.9 nm,电流强度范围为900 mA,灵敏度约为1000 mA/nm,电流强度可精确到10 mA.理论和实验符合得很好.

A new electric current sensor based on fiber Bragg grating tuned by magnetostrictive material rod is demonstrated. A fiber Bragg grating is firmly clung on a magnetostrictive rod that is put into the central part of a solenoid. The Bragg wavelength of the fiber grating will shift when the uniform magnetic field in the solenoid changes. The rod will have elastic lengthening along the direction of the magnetic field. The grating resonant wavelength of fiber grating will shift as consequence of the rod lengthening. The relationship between the electric current and the wavelength shift is basically linear. The wavelength range of linear tuning is about 0.9 nm. The electric current range of sensing is about 900 mA. The sensitivity is about 1000 mA/nm. The electric current can be accurate to 10 mA. The experimental result coincides with the theory.