同一斜探头在不同材料中实测入射点不同, 其差异之大对缺陷定位精度必定产生重要影响。通过用CSK-IA试块对斜探头理论入射点和实测入射点声束传播过程进行对比研究发现, 实测入射点与被检对象的声速之间有密切关系, 于是提出声束等效传播路径呈梭形, 且此棱形折射角的变化而变化, 很好地解释了这一现象。

It is suggested that the same angle probe has different incident point in different materials. The test data show that the variations are very large and maybe seriously affect the accuracy of defect location. The comparative study on block CSK-IA of ultrasound path of the measured and the theory incident point reveals that the measured incident point has relation with velocity of material for test. Thereupon the equivalent sound path is of spindle shape is put forward, which varied with the refraction angle, and well explains the phenomenon.