基于非轴对称涡流场的保温管偏心检测

Eccentricity Detection of Heat Preservation Pipe Based on Non-axsymmetric Eddy Current Detection Model

保温管的偏心检测对防腐保温管的生产质量及使用寿命有重要影响。基于偏心检测的原理,提出了一种可消除管道自身形变的涡流传感器布置方式。利用电磁场数值计算方法,对非轴对称涡流场模型进行了数值分析,求得了管道表面的涡流密度与磁感应强度;并验证模型的正确性,分析了管径大小、激励频率对偏心检测中涡流传感器灵敏度的影响。理论上为保温管偏心检测涡流传感器激励频率的选择以及信号的误差分析提供了参考。

The eccentric test of insulation pipe has an important influence on the production quality and service life of anticorrosion insulation pipe. Based on the principle of eccentric detection,a kind of eddy current sensor placement method which can eliminate the deformation of pipeline is proposed. A numerical analysis is carried out for the non-axial symmetric eddy current field model. The eddy current density and the magnetic flux density are obtained. The correctness of the model is verified. The influence of the diameter of the tube diameter and the frequency of the excitation frequency on the sensitivity of the eddy current sensor is analyzed. In theory,it provides a reference for the choice of the excitation frequency of the eddy current sensor and the error analysis of the signal.