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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 .9nm ,电流强度范围为 90 0mA ,灵敏度约为 10 0 0mA nm ,电流强度可精确到 10mA。理论和实验符合得很好
A new type of current sensor based on the magnetostrictive rod tuned fiber Bragg grating has been studied theoretically and experimentally. A fiber Bragg grating is securely attached to a magnetostrictive rod placed in the center of a multilayer solenoid to form the sensor head. When the current through the solenoid is changed, the magnetostrictive material generates a strain in the longitudinal direction due to uniform magnetic field and is transmitted to the fiber grating, resulting in the Bragg wavelength shift of the fiber grating. The relationship between applied current and wavelength shift is linear. The linear tuning wavelength range is 0 .9 nm, the current intensity range is 90 0 mA, the sensitivity is about 100 mA and the current intensity is accurate to 10 mA. The theory is in good agreement with the experiment