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依据谐波分析法给出的评定信号质量指标的准则,提出了基于小波分析的光栅信号质量评估方法,并讨论了此方法的特征与优点.与谐波分析法相比较,小波分析在时域和频域同时具有良好的局部化性质,每次小波变换所取的都是原信号的最大可能近似值,信号的失真度小,通过变更尺度,可以对信号更细微的瞬态特征进行研究,并最大可能地除去噪声,较快地得到理想的质量评定效果(通常只需3至5次变换即可).在此基础上,给出了相应的小波分析评定光栅信号质量的实验方法.
According to the criteria for evaluating signal quality index given by harmonic analysis method, a method of grating signal quality assessment based on wavelet analysis is proposed, and the characteristics and advantages of this method are discussed.Compared with harmonic analysis method, wavelet analysis in time domain and The frequency domain has good localization property at the same time. Each wavelet transform takes the maximum possible approximation of the original signal and the distortion of the signal is small. By changing the scale, the finer transient characteristics of the signal can be studied and the maximum It is possible to get rid of the noise and get the ideal quality evaluation result quickly (usually only need 3 to 5 times transformation) .And on this basis, the corresponding wavelet analysis is given to evaluate the grating signal quality.