Because of the common offset working mode of GPR, there are large amount of horizontal coherent noise in the GPR record.
由于探地雷达采用共偏移距剖面的工作方式,造成数据记录中存在大量水平相干噪声。
After a description of the basic principle of vertical ultrasonic guided wave, this paper has made an analysis on the variation of the displacement offset of vertical mode variant with frequency; In [ 1] W.
在纵向超声导波基本原理的基础上,分析了两种纵向模式位移分量随频率的`变化而变化的情况,给出了一种梳状对称换能器对管道缺陷的有效检测。