声程对斜探头前沿及K值测量的影响

The Effect of Beam Path on the Measurement of Front Distance and K Value of Angle Probe

为了确定超声探伤用斜探头的探头前沿l0和K值的测试值与测试声程的关系,设计了不同声程下的l0和K值的测量试验。在CSK-ⅠA,CSK-ⅢA和长输管线标准试块(SGB试块)上的测试结果表明,测量用参考反射体的声程影响斜探头l0和K值的测量精度。在近场区外测量时,l0的测量一致性高;晶片面积及测量声程影响K值的测量结果。

In order to get the relationshipe of beam path to front distance（l0） and K value of angle probe, some experiments with different beam path length were designed. Testing on the standard block CSK-ⅠA, CSK-ⅢA and SGB showed that, the measuring precision of l0 and K value was affected by the beam path length of reference reflector. When testing was carried on near field zone, the contiuity of l0 was good, and the area of crystal would affect K value also. Means to get more accurate l0 and K value was analyzed in those experiments and it was very helpful to ultrasonic testing.