金属管道内外壁缺陷的脉冲涡流检测系统

赵番; 汤晓英; 王继锋; 浦哲

doi:10.11973/wsjc202006013

金属管道内外壁缺陷的脉冲涡流检测系统

赵番^1,2, ,,
汤晓英^1,2,
王继锋^1,2,
浦哲^1,2

1. 上海市特种设备监督检验技术研究院, 上海 200062;
2. 上海压力管道智能检测工程技术研究中心, 上海 200062

基金项目:

上海市优秀技术带头人计划资助项目（19XD1432600）；上海领军人才项目（沪人社专领[2016]002号）

详细信息

作者简介:
赵番(1981-),男,工程师,硕士,主要从事管道智能内检测方面的研究

通讯作者:
赵番, E-mail:zhaofan@ssei.cn

中图分类号: TP273;TG115.28
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出版历程
- 收稿日期: 2020-01-08
- 刊出日期: 2020-06-09

A pulsed eddy current detection system for distinguishing defects in inner and outer walls of metal pipes

ZHAO Fan^1,2, ,,
TANG Xiaoying^1,2,
WANG Jifeng^1,2,
PU Zhe^1,2

1. Shanghai Institute of Special Equipment Inspection and Technical Research, Shanghai 200062, China;
2. Shanghai Engineering Research Center of Pressed Pipeline Intelligent Inspection, Shanghai 200062, China

摘要

摘要: 针对金属管道的内、外壁缺陷的区分难题，采用脉冲涡流检测技术来区分内、外壁缺陷，设计了一套涡流检测系统。系统采用占空比为50%的矩形波作为涡流激励信号；设计了分别由涡流线圈和串联电阻组成的测量桥臂和参考桥臂；通过中央处理器（CPLD）进行除法运算得到差分电导，根据差分电导的不同波形，可以判断缺陷是位于管道内壁还是外壁。设计了信号采样时序，利用内检测器动态测试机构来评价涡流检测系统对内、外壁缺陷的识别程度。测试结果表明该脉冲涡流检测系统能准确区分出金属管道的内、外壁缺陷。
- 脉冲涡流 /
- 测量桥臂 /
- 参考桥臂 /
- 差分电导
Abstract: To solve the problem of distinguishing corrosion defects inside and outside the metal pipeline, a brand-new pulsed eddy current (PEC) system based on differential conductivity is established. The 50% duty cycle square wave is used as driving signal. A measuring bridge arm and a reference bridge arm composed of eddy current coil and series resistance are designed respectively. Complex programmable logic device (CPLD) is used to get differential conductance by using differential current divided by differential voltage. At last the eddy current signal sampling sequence is developed. A dynamic testing fixture with artificial defects carved on the pipeline is used to validate PEC system's accuracy. The differential conductance signal is displayed on the oscilloscope. Results show that the inside defect had two peaks, positive peak and negative peak, but the outside defect only had one positive peak. We can conclude that the brand-new PEC system has high accuracy in distinguishing inside and outside defects.
- pulsed eddy current /
- measuring bridge /
- reference bridge /
- differential conductance