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用直探头接触法在圆管内侧做超声波探伤时,由于工件形状与常用的条状平板试块不同,以致引起误差。本文利用声学与几何光学的相似性,从声束传播理论出发,导出对平板与圆管两种工件,在材质相同并且缺陷深度,大小一样的情况下,探头接收到的不同声压间的关系,从而求出两者间的修正值,以便利用常规的条状平板试块,通过灵敏度补偿的方法,科学地对圆管材质或圆管角焊缝进行探伤。
When using the straight probe contact method to do ultrasonic testing on the inside of the circular tube, the shape of the workpiece is different from that of the commonly used strip flat test block, which causes errors. In this paper, using the similarity of acoustic and geometrical optics, the theory of sound beam propagation is used to derive the relationship between the different sound pressure received by the probe under the same material and the same defect depth and size , So as to obtain the correction value between the two, in order to use the conventional strip plate test block, through the method of sensitivity compensation, scientific testing of the pipe material or the pipe fillet weld.