安培力与磁场大小成正比,基于安培力的磁场传感器具有很好的线性度。基于安培力的原理和 正交双频光纤激光器,通过在光纤激光器表面溅镀一层金膜,实现了一种结构紧凑的微型光纤 激光磁场传感器。在垂直磁场的作用下,在所提出的溅镀金膜光纤激光器两端施加交流电流,所产 生的安培力会施加在激光腔上并在腔内引入双折射,引起激光器拍频频率变化,从而实现对磁场的测量。 结果表明所提出的光纤激光磁场传感器具有良好的线性度和抗干扰能力。

Ampere force is proportional to the strength of magnetic field, and magnetic field sensors based on Ampere force show good linearity. Based on principle of Ampere force and an orthogonal dual-frequency fiber laser, a compact and miniature fiber laser magnetic field sensor is realized by sputtering Au coating on the fiber laser surface. Alternative current is injected into both ends of the proposed Au coating fiber laser under a perpendicular magnetic field. The Ampere force generated is exerted onto the fiber laser to induce an additional birefringence into the laser cavity, which leads to the beat note frequency change of the laser and the magnetic field can therefore be measured. Results show that the proposed fiber laser magnetic field sensor has good linearity and capacity of resisting disturbance.