微计算机控制的FFT电化学阻抗测量系统

微计算机控制的FFT电化学阻抗测量系统 MICROCOMPUTER-BASED FFT ELECTROCHEMICAL IMPEDANCE MEASUREMENT SYSTEM 谷宇航 Gu Yuhan first-author 吴秉亮 Wu Bingliang 本文描述了微计算机控制的电化学测量系统的硬件及FFT阻抗测量软件,在此软件中采用由20个分立的频率成分构成的似随机波作激励信号,使系统的测量精度大大提高。该系统对等效电路及Li/LiClO 4 ,PC体系的阻抗测量结果证实了它在电化学研究中是一个有力的工具。 Measurement of electrochemical impedance by Fast Fourier Transform （FFT） technique is an important method of studying mechanism of electrochemical processes. This paper described a microcomputer-based electrochemical measurement system which can be used to perform various electrochemical experiments. The system consists of an APPLE II plus computer, working in conjunction with a width-band potentiostat and specially designed interfacing circ uits, inclucing two channels of D/A converter, a single channel of A/D converter and channels for switch-controll. The analog outputs can sent various exciting signals to the potentiostat, and response signals of the electrochemical cell can be sampled by the sample/hold amplifier and converted into digitals in the A/D converter and stored in the micro-computer. In the FFT impedance software the exciting signal is a synthetic pseudorandon wave which consists of 20 components of various frequency, each of them has the same amplitude but random initial phase angle. Results of impedance measurement of the Pt/Fe（CN） 6 3- , Fe（CN） 6 4- system and Li/LiC1O 4 , propylene carbonate system agreed well with literature data, thus demonstrating ability of the computerized measurement system in various domains of the electrochemistry. 微计算机 快速富氏变换 电化学阻抗 锂电极 中国科学院科学基金 1987-03-01 2021-04-01 3