21 November 2007 A novel high-birefringence fiber loop mirror electric current sensor
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Proceedings Volume 6781, Passive Components and Fiber-based Devices IV; 678148 (2007) https://doi.org/10.1117/12.743326
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China
Abstract
A novel electric current sensor based on a high-birefringence fiber loop mirror(HBFLM) and a kind of magnetostrictive material rod(MMR) is demonstrated theoretically and experimentally. Part of the high-birefringence fiber(HBF) is pasted onto the MMR which is placed in the central part of a solenoid. The HBFLM is used as the sensor head and the linear filter simultaneously. Part of the high-birefringence fiber(HBF) is pasted onto the MMR which is placed in the central part of a solenoid. The rod will have elastic lengthening along the direction of the magnetic field when the uniform magnetic field changes, which will lead to a change of transmission intensity of the HBFLM filter, thus the variation of the electric current can be determined via the laser wavelength within the quasi-linear transmission range of the HBFLM filter. The sensitivity reaches 0.0153/100mA, the resolution reaches 10mA. Comparing with the previous fiber-optic electric current sensor, it has nothing with the linear birefringence based on Faraday effects in the previous fiber-optic electric current sensor. Comparing with the expensive and complex FBG electric current, the sensing signal can be directly detected by a photodiode(PD) and complicated demodulation devices are avoidable. The advantages of the electric current include optical power detection, simple and smart structure, high sensitivity, low cost, and good repeatability, etc.
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Dong Bo, Dong Bo, Qida Zhao, Qida Zhao, Liubo Tongqing Liao, Liubo Tongqing Liao, Shuhong Li, Shuhong Li, Xiangye Zeng, Xiangye Zeng, Yinping Miao, Yinping Miao, Guiling Huang, Guiling Huang, "A novel high-birefringence fiber loop mirror electric current sensor", Proc. SPIE 6781, Passive Components and Fiber-based Devices IV, 678148 (21 November 2007); doi: 10.1117/12.743326; https://doi.org/10.1117/12.743326
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