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2 February 2009 Closed-loop fiber optic current sensor using ferromagnetic collector and Bi4Ge3O12 crystal
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Bi4Ge3O12 magneto-optic crystal was chosen as sensitive materials, and a current sensor based on Faraday rotation of materials was designed. A ferromagnetic collector with an air gap and feedback windings were utilized in the sensor to construct a closed-loop current sensor. The magneto-optic crystal showed stronger magneto-optic effect and smaller temperature coefficient when it was exposed to the light, which was produced by a semiconductor laser with a working wavelength of 655nm. The ferromagnetic collector was used to collect the magnetic field generated by the measured current. The collector could greatly reduce the influence of the position variation of the conductor on the output. The measurement system was a closed-loop system due to introducing the negative feedback coil to the measuring system, so the linear range, linearity, temperature stability and dynamic characteristic index of the sensor were improved greatly. The principle of this sensor was introduced in detail. The structure of this sensitive component, as well as the signal conditioning circuit, was given. Some experimental data and the interpretation of these data were presented.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Binghao Bao, Jinwei Zhang, and Ying Xiao "Closed-loop fiber optic current sensor using ferromagnetic collector and Bi4Ge3O12 crystal", Proc. SPIE 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 71570C (2 February 2009);

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