Miniature Fiber-Optic Magnetic Field Sensor Based on Ampere Force and Fiber Laser  

作　　者：Weiren CHENG Tianming LUO Linghao CHENG Hao LIANG Bai-ou GUAN 

机构地区：[1]Institute of Photonics Technology,Jinan University,Guangzhou 510632,China

出　　处：《Photonic Sensors》2020年第4期291-297,共7页光子传感器（英文版）

基　　金：supported in part by the National Natural Science Foundation of China(NSFC)(Grant Nos.61875246 and 61675091);the Science and Technology Plan of Guangzhou(Grant No.201707010338).

摘　　要：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 flux density 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.

关 键 词：Fiber laser optical magnetic field sensors fiber-optic sensors Ampere force 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]