【作者】 董永贵； 孟凡；

【Author】 Dong Yonggui Meng Fan (State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instruments and Mechanology,Tsinghua University,Beijing 100084,China)

【机构】 清华大学精密仪器系精密测试技术及仪器国家重点实验室；

【摘要】 采用方波脉冲作为激励信号,单次测量即可得到多频率点的阻抗值。由于高次谐波频率成分的幅值衰减很快,所得到的阻抗谱带宽有限。以频率逐次升高的一组方波信号作为激励,得到多段阻抗谱。将多段阻抗谱进行拼接,实现了一种电阻抗谱的分段测量方法。对电涡流敏感线圈及人体皮肤的电阻抗体系进行了实验测试。结果表明,这种测量方法可快速获取光滑的阻抗谱曲线,为实现一种低成本的阻抗谱测量系统提供了一种新思路。更多还原

【Abstract】 When excited by a square-wave pulse signal,electrical impedance values on multiple frequency points could be obtained within one measurement cycle.However,because the amplitudes of high-order harmonic components would decay rapidly,the frequency width of the obtained impedance spectroscopy is limited.Using a series of square-wave signals with successive increasing frequencies as the excitation,multiple impedance spectroscopy segments are obtained.A segmented measurement method for electrical impedance spectroscopy is implemented by connecting the spectroscopy segments.Electrical impedance systems of an eddy current sensing coil and the human skin are experimentally tested.The results indicate that,smooth impedance spectroscopy curves can be rapidly obtained by such a method.A novel idea is therefore provided for implementing a low cost impedance spectroscopy measurement system.更多还原