复电阻率测量方法与模型仿真
  <sup>*</sup>

doi:10.11867/j.issn.1001-8166.2014.11.1271

介绍了国内外复电阻率测量方法的发展状况, 指出了其中存在的问题, 提出了利用高斯白噪声作为信号源的复电阻率测量方法。在matlab的simulink组件中建立了复电阻率测量模型并进行了仿真测试, 利用时间域和频率域相结合的办法计算获得了模型待测区域的复电阻率值, 并将计算值与理论值进行了对比分析, 结果表明利用该方法获得的复电阻率值与待测区域的真实电性特征相符。

关键词: 高斯信号源, 频谱, 激电仪, 傅里叶变换

The development and the current research situations at home and abroad of complex resistivity measurement were introduced and existing problems pointed out. A measurement method in time domain with Gaussian White Noise as input signal was proposed. The complex resistivity measurement model was built by simulink in matlab and the simulation was tested. The complex resistivity was obtained combined by time domain and frequency domain method. Then, the comparison and analysis between the calculated value and theoretical value were conducted, and results showed that the complex resistivity gained by this method was coincided with the real electrical characteristics of the model.

Key words: Gaussian source, Frequency spectrum, Induced polarization instrument, Fourier transform.

中图分类号:

P631.3+22

图1 复电阻率法仿真电路

Fig.1 Complex resistivity method artificial circuit

图2 电流和电压时域波形图

Fig.2 Time domain waveform of current and voltage

图3 电流和电压频域波形

Fig.3 Frequency domain waveform of current and voltage

图4 复电阻率理论值和计算值对比

Fig.4 Comparison between calculated and theoretical values

图5 观测值混入随机干扰后计算所得复电阻率与理论复电阻率对比

Fig.5 Comparison between calculated and theoretical values of observed value with random disturbance

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