利用小波变换检测电化学噪声信号波形

Application of Wavelet Transform to Detect the Waveform of Electrochemical Noise

简述了应用小波变换检测点蚀电化学噪声信号的基本原理。对在３．５％ＮａＣｌ溶液中工业纯铝发生点蚀的电化学噪声信号检测分析表明：小波变换能够提取发生点蚀的电化学噪声信号和测量系统噪声在多尺度分辨空间中的波形特征，根据表征该特征的小波系数模极大值在不同尺度下的传播特性，可实现对点蚀电化学噪声信号波形的检测。

The principle on the pitting electrochemical noise detected by using wavelet transform was described briefly and the signal of pitting electrochemical noise was analyzed for commercial pure aluminum in 3.5% NaCl solution. The result shaved that wavelet transform could not only obtain the waveform characteristic of pitting signal and system noise in the multi-scale space, but also detect the waveform of pitting electrochemical noise according to the transmitting characteristic of the maximum module of wavelet coefficients, which represented the waveform characteristic.