摘要
提出利用常规的白噪声信号,经小波变换处理后,快速得到系统阻抗,并采用Simulink软件进行了仿真实验。实验基于Voigt电路,探讨并优化了小波变换的中心频率、采样频率和采样时长等参数。测量范围为0.05~20000Hz时,等效电路元件的测试误差在0.5%以下,测量时长为85s。在质子膜燃料电池和钝化金属小孔腐蚀等效电路模型中,该方法的拟合误差在0.2%以下,具有良好的适用性。利用该方法可以直接通过采集电化学系统的白噪声信号而快速得到阻抗,从而可以低成本地实现电化学系统的实时快速监测。
A fast measurement of electrochemical impedance spectroscopy was provided through white noise signal and wavelet transform,and simulation experiments were carried out with software of Simulink.The effects of the center frequency,sampling rate and time were optimized in terms of the Voigt equivalent circuit.With the impedance range from 0.05 Hz to 20 000 Hz,the measuring relative error of elements of the equivalent circuit were less than 0.5% and the elapsed time was 85 s.At the equivalent circuits of both proton exchange membrane fuel cell and pitting corrosion of passivated metal,the approach could be well applied with the fitting error less than 0.2%.EIS can be fast obtained and directly acquired from the white noise signal of the electrochemical process to achieve an in-site and real-time monitoring at low cost.
作者
张旭
杨长江
高博斌
赵吕兴
ZHANG Xu;YANG Chang-jiang;GAO Bo-bin;ZHAO Lyu-xing(Faculty of Metallurgy and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China)
出处
《矿冶》
CAS
2020年第5期57-62,共6页
Mining And Metallurgy
基金
国家自然科学基金资助项目(51664040)
昆明理工大学分析测试基金(2019M20172202010)。
关键词
电化学阻抗
小波变换
白噪声
SIMULINK
electrochemical impedance spectroscopy
wavelet transform
white noise
Simulink
