论文部分内容阅读
在水利水电工程混凝土质量无损检测中 ,应用垂直声波反射法得到的声波数据 ,由于直达波、面波等强干扰与有用的异常反射信号叠加在一起 ,给资料解释带来了很大的困难。根据直达波、面波的等时传播、波数为零的特点 ,运用频率—波数滤波技术将异常反射信号分离出来。另外 ,由于数据采集时激发—接收距离的变化 ,以及检波器与建筑物表面耦合紧密程度的影响 ,造成了波的静态时移和相邻道之间的能量变化 ,这些因素严重地影响了异常反射信号的分离效果。通过研究采用静校正和能量均衡等处理方法 ,较好地解决了分离异常信号处理过程中存在的问题。异常反射信号分离方法在三峡大坝永久船闸混凝土质量检测中得到应用 ,效果较好
In the nondestructive testing of concrete quality of water conservancy and hydropower projects, the application of vertical acoustic wave reflection method to obtain the acoustic data, as the direct wave, surface wave and other strong interference and useful abnormal reflection signal superimposed together to the data interpretation has brought great difficulties. According to the characteristics of direct wave and surface wave, such as isochronous propagation and zero wavenumber, the frequency-wavenumber filtering technique is used to separate the abnormal reflection signal. In addition, the static time-shift of the waves and energy changes between adjacent tracks due to the variation of the excitation-reception distance during data acquisition and the close coupling between the detector and the building surface have seriously affected the anomalies Reflection of signal separation effect. Through the study of static correction and energy balance and other processing methods, the problem of separation abnormal signal processing is well solved. Abnormal reflection signal separation method in the permanent ship lock of the Three Gorges Dam concrete quality testing has been applied, the effect is better