不拆包覆层钢质管道缺陷识别方法

Defect Identification Method of Steel Pipe without Removing Insulation Layer

本文基于谐波激励源和对称差分式磁聚焦谐波磁场检测探头搭建的实验平台,提出基于合成孔径雷达技术的数据处理方法。将低频正弦信号搭载高频正弦信号的谐波激励信号加载在探头上,激发谐波磁场进行管道检测,信号处理系统将数据点相量化,使其具有方向和大小,经过计算可得数据点的实部和虚部,进而可得检测过程的相位变化以表征管道的缺陷信息。通过管道缺陷检测示例可以验证此种处理方法的有效性,该算法灵敏度高,具有较高工程实用性。

Based on the experimental platform built by the harmonic excitation source and the symmetrical differential magnetic focusing harmonic magnetic field detection probe,this paper proposes a data processing method based on the synthetic aperture radar technology.Load the low-frequency sinusoidal signal with the harmonic excitation signal of the high-frequency sinusoidal signal on the probe,and excite the harmonic magnetic field for pipeline detection.The signal processing system quantizes the data points to make them have direction and size.The real part and the imaginary part,and then the phase change of the detection process can be obtained to characterize the defect information of the pipeline.The effectiveness of this processing method can be verified by the example of pipeline defect detection.The algorithm has high sensitivity and high engineering practicability.