| 反馈式巨磁阻抗弱磁传感器的设计与实现 |
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| 引用本文： | 卜雄洙,赵文,于葛亮,李云龙.反馈式巨磁阻抗弱磁传感器的设计与实现[J].南京理工大学学报(自然科学版),2011,35(6). |
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| 作者姓名： | 卜雄洙 赵文 于葛亮 李云龙 |
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| 作者单位： | 南京理工大学机械工程学院,江苏南京,210094 |
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| 摘 要： | 为提高基于巨磁阻抗(GMI)效应的弱磁传感器的性能,该文研究了Fe基非晶带在纵向激励下的GMI特性.建立和分析了传感器反馈模型,设计了反馈式GMI弱磁传感器.由CMOS集成反相器组成脉冲激励电路,由峰值检波电路、低通滤波电路、差分放大电路及电压跟随器组成信号调理电路,由仪用放大器、低通滤波电路、电阻和电感组成负反馈电路.利用亥姆霍兹线圈和标准恒流电源组成标定系统,对该传感器进行了加反馈和不加反馈两种情况下的对比测试.实验结果表明:在外加磁场强度为-2.5～2.5Oe范围内,该反馈式GMI弱磁传感器较无反馈的GMI弱磁传感器的线性度指标提高了41％；传感器输出的漂移在不加反馈时为10～20 mV/h,加入负反馈后在无外加磁场时为2 mV/h,在外加磁场强度为2.5Oe时为3 mV/h；传感器的截止频率在未加反馈时约为2 kHz,加入负反馈后提高到了4 kHz以上.
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| 关 键 词： | 巨磁阻抗 弱磁 传感器 负反馈 线性度指标 漂移 截止频率 |
Design and Realization of Feedback-type Giant Magneto-impedance Micro-magnetic Sensor |
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| BU Xiong-zhu
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ZHAO Wen
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YU Ge-liang
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LI Yun-long.Design and Realization of Feedback-type Giant Magneto-impedance Micro-magnetic Sensor[J].Journal of Nanjing University of Science and Technology(Nature Science),2011,35(6). |
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| Authors: | BU Xiong-zhu ZHAO Wen YU Ge-liang LI Yun-long |
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| Institution: | BU Xiong-zhu,ZHAO Wen,YU Ge-liang,LI Yun-long(School of Mechanical Engineering,NUST,Nanjing 210094,China) |
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| Abstract: | To improve the performance of a micro-magnetic sensor based on the giant magneto-impedance(GMI)effect,the GMI characteristic of Fe-based amorphous ribbon under longitudinal excitation is researched.A sensor feedback model is established and analyzed.A feedback-type GMI micro-magnetic sensor is designed.The excitation circuit is composed of complementary metal-oxide-semiconductor(CMOS)coupling reactor.The conditional circuit is composed of peak value detection circuit,low-pass filter circuit,difference ampli... |
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| Keywords: | giant magneto-impedance micro-magnetics sensors negative feedback linearity index drift cutoff frequency |
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