Abstract
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.
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Acknowledgment
This work was supported in part by the National Natural Science Foundation of China (NSFC) (Grant Nos. 61875246 and 61675091) and the Science and Technology Plan of Guangzhou (Grant No. 201707010338).
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Cheng, W., Luo, T., Cheng, L. et al. Miniature Fiber-Optic Magnetic Field Sensor Based on Ampere Force and Fiber Laser. Photonic Sens 10, 291–297 (2020). https://doi.org/10.1007/s13320-020-0590-5
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DOI: https://doi.org/10.1007/s13320-020-0590-5