A compact fiber-optic magnetic field sensor is proposed by packaging an orthogonal dual-frequency fiber grating laser and a copper wire with alternating electrical current together inside epoxy resin. The alternating current generates Ampere force in a magnetic field, which changes the birefringence of the fiber laser and hence tunes the frequency of the beat signal after photodetection. The magnetic field magnitude can then be detected by measuring the frequency change of the beat signal. The sensitivity of the sensor can be tuned with a maximum response of 35.21 kHz/kGs demonstrated. Moreover, the sensor shows good immunity to environment interference.

中文翻译：

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基于安培力和光纤激光的微型光纤磁场传感器

通过将正交双频光纤光栅激光器和带有交流电的铜线封装在​​环氧树脂内部，提出了一种紧凑型光纤磁场传感器。交流电在磁场中产生安培力，该安培力改变光纤激光器的双折射，从而在光电检测后调整拍频信号的频率。然后可以通过测量拍信号的频率变化来检测磁场强度。传感器的灵敏度可以调整为最大响应为35.21 kHz / kGs。此外，该传感器还具有良好的抗环境干扰能力。