论文部分内容阅读
经典的频率域交流阻抗测量所需时间较长,因电极表面状态发生变化而影响测量的准确性。现代电子技术和计算机的发展,使得以小幅度和快速特点的时域法得到采用。我们建立了由Z-80单板计算机及接口电路组成的时域测量系统,包括信号发生、采集、存贮及数字处理功能。由D/A发生的8.2 mV单阶跃电位信号加在体系上,测量体系的暂态响应电流。用累加平均和数字平滑技术提高了信噪比。采用了指数近似与线性近似相结合的拉普拉斯变换算法。实现了阻抗测量和数据处理自动化。
The classical frequency domain AC Impedance measurement takes a long time, because the electrode surface state changes affect the measurement accuracy. The development of modern electronic technology and computers has led to the adoption of a time-domain approach featuring small amplitude and fast characteristics. We have established a time-domain measurement system consisting of the Z-80 single-board computer and interface circuits, including signal generation, acquisition, storage and digital processing functions. The 8.2 mV single-step potential signal generated by D / A was applied to the system to measure the transient response current of the system. Signal-to-noise ratio is improved with additive averaging and digital smoothing techniques. The Laplacian algorithm based on exponential approximation and linear approximation is used. Impedance measurement and data processing are automated.