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。
AC impedance measurement in frequency domain usually takes a lony time, resulting in change of the electrode surface which in turn affects the accuracy of measurement. The time domain method is adopted in our laboratory by setting up a transient signal recording syatem consisting of a Z—80 microprocessor and an I/0 interface. The system has such functions as signal generation, data sampling data storing and data processing. A 8.2mV potentialstep generated by D/A is applied to the cell via potentiostat and the transient response current is recorded simultaneously. Data averaging and data smoothing technique efficiently improve the ratio of signal to noise. We select the Laplacian transform algorithm in which the exponential and linear function are used as an approximation of the sampled data Signal recording and data processing proceed automatically.
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