Ampere force based magnetic field sensor using dual-polarization fiber laser.
Ampere force based magnetic field sensor using dual-polarization fiber laser.
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DOI：
10.1364/oe.21.013419
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发表时间：
2013-06
期刊：
影响因子：
3.8
通讯作者：
Linghao Cheng;Zhenzhen Guo;Jianlei Han;Long Jin;B. Guan
中科院分区：
文献类型：
--
作者：
Linghao Cheng;Zhenzhen Guo;Jianlei Han;Long Jin;B. Guan
提出了一种将双偏振光纤光栅激光器置于铜线下的磁场传感器。在垂直磁场作用下，电流通过铜线产生安培力，挤压光纤光栅激光器，使激光腔内的双折射发生变化，从而引起拍频的变化。当交流电注入铜线时，磁场引起的拍音频率变化可以与环境干扰区分开来。因此，一种新型的光纤磁场传感器具有高灵敏度和固有的抗干扰能力。
A magnetic field sensor is proposed by placing a dual-polarization fiber grating laser under a copper wire. With a perpendicular magnetic field applied, an electrical current flowing through the copper wire can generate Ampere force to squeeze the fiber grating laser, resulting in the birefringence change inside the laser cavity and hence the change of the beat note frequency. When an alternating current is injected into the copper wire, the magnetic field induced beat note frequency change can be discriminated from environment disturbances. A novel fiber-optic magnetic field sensor is therefore demonstrated with high sensitivity and inherent immunity to disturbances.