| 用于电磁感应阻抗测量的高精度鉴相器 |
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| 引用本文： | 秦明新,王聪,董秀珍,尤富生,史学涛,刘锐岗,付峰. 用于电磁感应阻抗测量的高精度鉴相器[J]. 医疗卫生装备, 2002, 23(3): 18-19,22 |
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| 作者姓名： | 秦明新 王聪 董秀珍 尤富生 史学涛 刘锐岗 付峰 |
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| 作者单位： | 第四军医大学生物医学工程系,西安市,710032 |
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| 摘 要： | 根据反馈原理,采用乘法器设计和实现了一个用于电磁感应阻抗测量的高精度鉴相器。当激励频率为 50KHz时,鉴相器的相位灵敏度△Vq/△φ=11．46V/rad;输出端噪声的标准差 STD(△φ[rad])=1．42×10-4rad;输出端的信噪比 SNR＝41．842dB;系统响应时间为 3s。
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| 关 键 词： | 电阻抗 电磁感应 鉴相器 |
| 文章编号： | 1003-8868(2002)03-0018-03 |
High-resolution phase detector for impedance measurement by electromagnetic induction |
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| QIN Ming-xin,WANG Cong,DONG Xiu-zhen,LONG Fu-sheng,SI Xue-tao,LIU Rui-gang,FU Feng. High-resolution phase detector for impedance measurement by electromagnetic induction[J]. Chinese Medical Equipment Journal, 2002, 23(3): 18-19,22 |
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| Authors: | QIN Ming-xin WANG Cong DONG Xiu-zhen LONG Fu-sheng SI Xue-tao LIU Rui-gang FU Feng |
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| Abstract: | The high-resolution phase detector for impedance measurement by electromagnetic induction, based on the principle of feedback, is electrically realized with multipliers. When the excitation frequency is 50KHz, the sensitivity, the STD (standard deviation) of the measured phase, the SNR (signal noise ratio) and the response time of the system are 11.46V/rad, 1.42*10-4rad, 41.842dB and 3s respectively. |
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| Keywords: | impedance electromagnetic induction phase detector |
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