管道缺陷位置对瞬变电磁检测信号的影响

Influence of Pipeline Defect Location on Transient Electromagnetic Detection Signal

针对金属管道腐蚀位置的不同对瞬变电磁检测信号影响的问题,研制了试验装置,设计了相应的试验方案。结果表明:在传感器覆盖范围内,缺陷在管道周向上对检测信号幅值的影响较大,且缺陷在管道正下方时信号幅值最小;背离管道正下方时信号幅值最大,但不会超过无缺陷处的信号幅值,在管道的轴向上基本没有影响。同时,也确定了检测信号与径向角度之间的数学关系。为瞬变电磁法探头的优化、判断金属管道缺陷的准确位置提供了参考。

The influence of different location of metal pipeline corrosion on transient electromagnetic testing signal is studied.By making the experimental device,the corresponding test scheme is designed.The test results show that in the coverage of the sensor,the defect has a great influence on the amplitude of the detection signal on the circumference of the pipeline and the signal amplitude is minimum when the defect is under the straight line of the pipeline.The amplitude of the signal is maximum but will not exceed the signal amplitude without defect at the bottom of the pipeline.The value is basically not affected by the axial direction of the pipeline.At the same time,the mathematical relationship between the detection signal and the radial angle is also determined.It provides guidance and reference value for the optimization of transient electromagnetic probe and the accurate location of metal pipeline defects in pipeline inspection industry.