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建立了由AppleⅡ~+微机和自制的电化学接口仪组成的时域法电极阻抗测量系统。该测量系统以奇次谐波合成的伪随机白噪声作为激励信号,以FFT作为时频变换的工具,并采用了信号平均技术以提高信噪比。用该测量系统测量模拟电路和实际电化学体系,其结果分别与SOLARTRON1250频响分析仪和文献数据接近。最后还讨论了时域法测量电极阻抗的激励信号的选择、测量频率上、下极限和噪声影响等问题。
A time-domain electrode impedance measurement system composed of AppleⅡ ~ + microcomputer and self-made electrochemical interface instrument was established. The measurement system uses pseudo-random white noise synthesized by odd harmonics as excitation signal, FFT as a tool for time-frequency transformation, and adopts signal averaging technique to improve signal-to-noise ratio. Using this measuring system to measure the analog circuit and the actual electrochemical system, the results are close to the SOLARTRON1250 frequency response analyzer and the literature data, respectively. Lastly, we discuss the selection of the excitation signal of the time-domain method to measure the impedance of the electrode, and measure the upper and lower limits of the frequency and the influence of the noise.