电Spectroscopy中四极探头数据采集系统的优化要求
Optimal Requirements of a Data Acquisition System for a Quadrupolar Probe Employed in Electrical Spectroscopy
摘要：
本文讨论了电谱的发展和工程的同时和非侵入性测量的电阻率和介电常数。合适的四极探头能够在低频（LF）带宽（100kHz）中以低于固定极限（10%）的不准确度对地下进行测量。四极探头应连接到适当的模数转换器（ADC），该模数转换器以相位和正交（IQ）或均匀模式进行采样。如果四极杆的特征在于与表面的电流接触，则由于IQ或均匀采样ADC而导致的电阻率和介电常数测量的不准确性可以解析地表示。大量的数值模拟证明，该探头的性能取决于所选择的采样器，并且在相同的操作条件下，即比特分辨率和介质，与均匀模式相比，IQ更好。
英文摘要：
This paper discusses the development and engineering of electrical spectroscopy for simultaneous and non invasive measurement of electrical resistivity and dielectric permittivity. A suitable quadrupolar probe is able to perform measurements on a subsurface with inaccuracies below a fixed limit (10%) in a bandwidth of low (LF) frequency (100kHz). The quadrupole probe should be connected to an appropriate analogical digital converter (ADC) which samples in phase and quadrature (IQ) or in uniform mode. If the quadrupole is characterized by a galvanic contact with the surface, the inaccuracies in the measurement of resistivity and permittivity, due to the IQ or uniform sampling ADC, are analytically expressed. A large number of numerical simulations proves that the performances of the probe depend on the selected sampler and that the IQ is better compared to the uniform mode under the same operating conditions, i.e. bit resolution and medium.
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