传感器提离高度对瞬变电磁法检测信号的影响

The influence of sensor lift height on transient electromagnetic signal

研究了提离高度对瞬变电磁法检测的影响,制作了传感器装置,搭建了试验平台,设计了试验方案。结果表明:提离高度在有效范围内只影响信号的幅值,而对信号衰减曲率几乎无影响,对于厚度分别为5,10,15mm的试件,在有效提离高度为100mm和大于100mm时,验证了传感器有效覆盖范围为400mm;厚度为20mm试件的试验数据可以表明该传感器的适用范围;瞬变电磁法传感器位置的上下浮动对评价结果无影响。试验结果为实际工况中非开挖腐蚀检测器的设计、脉冲涡流探头的优化及腐蚀评估的准确性提供了参考价值。

In order to study the influence of lift height on transient electromagnetic detection technology,a sensor device together with a test platform was built and the test plan was correspondingly designed.The results show that the effective lift height for test piece of thickness being 5 mm,10 mm and 15 mm is 100 mm.The effective attenuation height of the received signal is constant.When the lift height is greater than 100 mm,the effective coverage of the sensor is verified to be 400 mm.For the experimental data of the thickness of the 20 mm test piece,the applicable range of the sensor is known.It is determined that the floating position of the transient electromagnetic sensor has no influence on the evaluation result.The test result provides reference value for the design of the non-excavation corrosion detector,the optimization of the pulsed eddy current probe and the corrosion evaluation accuracy in the actual working condition.