A Magnetic Field Sensor Based on a Magnetic Fluid-Filled FP-FBG Structure
AbstractBased on the characteristic magnetic-controlled refractive index property, in this paper, a magnetic fluid is used as a sensitive medium to detect the magnetic field in the fiber optic Fabry-Perot (FP) cavity. The temperature compensation in fiber Fabry-Perot magnetic sensor is demonstrated and achieved. The refractive index of the magnetic fluid varies with the applied magnetic field and external temperature, and a cross-sensitivity effect of the temperature and magnetic field occurs in the Fabry-Perot magnetic sensor and the accuracy of magnetic field measurements is affected by the thermal effect. In order to overcome this problem, we propose a modified sensor structure. With a fiber Bragg grating (FBG) written in the insert fiber end of the Fabry-Perot cavity, the FBG acts as a temperature compensation unit for the magnetic field measurement and it provides an effective solution to the cross-sensitivity effect. The experimental results show that the sensitivity of magnetic field detection improves from 0.23 nm/mT to 0.53 nm/mT, and the magnetic field measurement resolution finally reaches 37.7 T. The temperature-compensated FP-FBG magnetic sensor has obvious advantages of small volume and high sensitivity, and it has a good prospect in applications in the power industry and national defense technology areas. View Full-Text
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Xia, J.; Wang, F.; Luo, H.; Wang, Q.; Xiong, S. A Magnetic Field Sensor Based on a Magnetic Fluid-Filled FP-FBG Structure. Sensors 2016, 16, 620.
Xia J, Wang F, Luo H, Wang Q, Xiong S. A Magnetic Field Sensor Based on a Magnetic Fluid-Filled FP-FBG Structure. Sensors. 2016; 16(5):620.Chicago/Turabian Style
Xia, Ji; Wang, Fuyin; Luo, Hong; Wang, Qi; Xiong, Shuidong. 2016. "A Magnetic Field Sensor Based on a Magnetic Fluid-Filled FP-FBG Structure." Sensors 16, no. 5: 620.
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