The Simple Virtual Impedance Spectroscopy Based on USB DAQ Card

M. Dorozhovets, M. Augustyn
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Abstract

The paper presents a virtual impedance spectroscopy based on a USB Personal DAQ/3000 card. A virtual spectroscope consist of a sine voltage generator (analog output of DAQ card), smoothing filter and two-channel voltage recorder - two analog inputs of DAQ card. The impedance of the tested object is measured indirectly using voltage samples on the object and a reference resistor, which is used to measure the current. All operations connected with signal generation, registration both voltage and current signals and also determination of the object impedance and its components has been developed in LabVIEW environment. In the paper a justification of the frequency band width of the signal depending on the maximum sampling frequency of DAC and the parameters of the used smoothing filter is presented. When the used DAQ card in analog input has only a single ADC therefore alternating sampling of both signals (voltage and current) must be used, therefore the additional signal phase shift proportional to signals frequency and sampling period occur. A simple and effective method of correction of this effect is proposed. In order to carry out experimental research, a research stand was developed. The uncertainty of the measurement results was investigated by A and B methods. Determined on the basis of the analysis of the uncertainty values of the measurement results show that using a relatively simple measurement DAQ card it is possible to build a virtual impedance spectroscopy of a few tenth percent relative combined standard uncertainty.
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基于USB DAQ卡的简易虚拟阻抗谱
本文介绍了一种基于USB个人DAQ/3000卡的虚拟阻抗谱。虚拟分光镜由正弦电压发生器(DAQ卡的模拟输出)、平滑滤波器和双通道电压记录仪(DAQ卡的两个模拟输入)组成。被测对象的阻抗是通过在被测对象上的电压样本和用于测量电流的参考电阻间接测量的。所有与信号产生、电压和电流信号的配准以及物体阻抗及其分量的确定有关的操作都是在LabVIEW环境中开发的。本文给出了根据DAC的最大采样频率和所用平滑滤波器的参数来确定信号频带宽度的方法。当模拟输入中使用的DAQ卡只有一个ADC时,必须使用两个信号(电压和电流)的交替采样,因此额外的信号相移与信号频率和采样周期成正比。提出了一种简单有效的校正方法。为了进行实验研究,开发了研究台架。采用A法和B法对测量结果的不确定度进行了研究。在确定测量不确定度值的基础上,分析结果表明,利用一个相对简单的测量DAQ卡,就可以建立一个相对组合标准不确定度为百分之几的虚拟阻抗谱。
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