小波包分析在混凝土缺陷检测中的应用

Wavelet packets analysis in the application of the interior defect detecting of concrete

小波包分析具有优越的时-频局部化性能,可以在时-频域以任意精度进行信号分析。针对混凝土内部缺陷诊断,本文采用小波包分析方法将超声接收信号分解到各个频带,然后以各频带能量作为识别混凝土内部质量的特征向量进行缺陷识别。通过试验验证本法可判别出混凝土的内部质量。

The wavelet packet analysis has an excellent localized performance in time-frequency domain, which may analyse a signal in an arbitrary resolutionin time-frequency domain. For the interior quality of concrete judged, the received ultrasonic signal could be decomposed into each frequency band according to wavelet packet analysis, and then the energy of each frequency band could be identified with characteristic vector to the diangosis interior quality of concrete. According to example showed, the methods can judg the interior quality of concrete.