Pulse eddy current thickness measurement method based on surface fitting
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摘要: 采用脉冲涡流技术对带包覆层管道的壁厚进行检测时，管道包覆层所带来的大提离会使得检测信号发生变化，进而影响信号特征量的变化规律，降低检测精度。针对该问题，通过分析晚期信号斜率特征量、提离高度以及管道壁厚三者之间的关系，发现在不同提离高度下所得到的晚期信号斜率与管道壁厚有着一一对应的关系，因而提出了一种基于曲面拟合的壁厚反演方法，并利用管道测试件进行了试验验证。结果显示，带包覆层管道壁厚的反演误差可控制在7%之内，表明该方法具有广泛的工程应用价值。Abstract: When the pulsed eddy current technology is used to detect the wall thickness of pipelines with coating, the large lift-off caused by the coating will change the detection signal, thus affect the change law of the signal characteristics and reducing the detection accuracy. In order to solve this problem, through the analysis of the relationship among the 3 factors, namely, the characteristic value of the late signal slope, the lift-off height and the pipe wall thickness, it is found that the late signal slope value obtained under different lift-off height has a a one-to-one relationship with the pipe wall thickness. Therefore, a wall thickness inversion method based on surface fitting is proposed, and then, the pipeline test pieces are used for experimental verification. The results show that the inversion error of pipe wall thickness with coating layer can be controlled within 7%, indicating that the method has extensive engineering application value.
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Keywords:
- pulsed eddy current /
- pipe wall thickness inversion /
- coating /
- lift-off effect /
- surface fitting
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