Design of pulsed eddy current detection system for ferromagnetic materials defects
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摘要: 为了解决带包覆层输油管道等储油设备的腐蚀缺陷位置及缺陷性质不易确定等问题，根据脉冲涡流检测技术的频谱宽、信号穿透能力强的优点，开发设计了一套基于脉冲涡流的铁磁性材料缺陷检测系统。设计的新型检测传感器可实现缺陷位置的精确测定，通过对检测电压信号时域及频域特征值与铁磁性材料试件厚度变化产生的定量关系，确定试件的缺陷程度。在实验室以及现场试验得到检测信号与被测试件厚度的数学关系式，结果表明该系统能够精确在线检测20 mm厚的包覆层下的铁磁性材料厚度及缺陷程度，具有一定的应用价值。Abstract: In order to solve the problem that the location and degree of defects of oil storage equipment such as oil pipeline with cladding layer are not easy to be determined due to corrosion, a set of defect detection system of ferromagnetic materials based on pulse eddy current is developed and designed according to the advantages of wide spectrum and strong signal penetration ability of pulse eddy current detection. Through the design of a new type of detection sensor, the precise measurement of the defect position is realized. Through the quantitative relationship between the time-domain and frequency-domain eigenvalues of the detection voltage signal and the changes of ferromagnetic materials with different thickness, the defect degree of the test piece is determined. The experimental results show that the system can accurately detect the thickness and defect degree of ferromagnetic materials under 20 mm coating layer, which has a certain application value.
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Keywords:
- pulsed eddy current /
- defect detection /
- sensor /
- thickness
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