中文摘要：

依据分析检测原理,对铁磁性管道脉冲远场涡流检测时激励线圈与接收线圈之间的间距对缺陷检测结果的影响进行试验研究。给出了试验所得的检测线圈衰减曲线、检测灵敏度曲线以及感应电压剖面曲线。对材质为J55,尺寸为73.8 mm×5.7 mm的油管进行检测试验,结果显示当线圈间距由60 mm逐步增加到210 mm时,检测线圈感应电压衰减曲线发生明显变化,缺陷检测灵敏度｜Δu｜/u由0.35逐步增加到143,最高灵敏度对应的接收时间点前移2 511μs;但线圈间距增加到240 mm时,灵敏度｜Δu｜/u降为73。试验结果表明：线圈间距为210 mm时,其检测灵敏度最佳。该研究对脉冲远场涡流检测探头的设计具有参考价值。

英文摘要：

Based on analysis of the principle,experiments are designed and performed to study the effect of the spacing between exciting coil and receiving coil on the detection sensitivity in pulsed remote field eddy current testing for ferromagnetic tube.Voltage decay curves of the receiving coil,sensitivity-time curves and time slices of voltage are given in the experiments. J55 oil well tube sample with a gauge of 73. 8 mm × 5. 7 mm is inspected and the experimental results show that the increase of the spacing between the exciting coil and the receiving coil will cause several changes. When the spacing varies from 60 mm to 210 mm,voltage descending curves of the receiving coil have significant changes,detection sensitivity ｜ Δu ｜ / u varies from 0. 35 to143 and the peak of detection sensitivity moves forward 2 511 μs,but detection sensitivity ｜ Δu ｜ / u falls to 73 when coil spacing increases to 240 mm. The experimental results show that the detection sensitivity is best when the distance reaches 210 mm. The results are of help to the design of pulsed remote field eddy current probe.