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清华大学学报(自然科学版)  2016, Vol. 56 Issue (6): 622-625,632    DOI: 10.16511/j.cnki.qhdxxb.2016.22.022
  机械工程 本期目录 | 过刊浏览 | 高级检索 |
基于参考电压相量法的涡流检测提离效应抑制
孙振国1, 蔡栋1, 李东1,2, 张文增1, 陈强1
1. 清华大学 机械工程系, 北京 100084;
2. 深圳大学 光电工程学院, 深圳 518060
Suppressing the lift-off effect in eddy current testing by adjusting the reference voltage
SUN Zhenguo1, CAI Dong1, LI Dong1,2, ZHANG Wenzeng1, CHEN Qiang1
1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;
2. College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
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摘要 为了有效抑制涡流检测的提离效应对缺陷信号的干扰, 在分析提离效应对探头线圈电压影响的基础上, 提出并实现了一种基于参考电压相量法的提离效应抑制电路, 并采用移相和幅值放大电路以实现相位和幅值的解耦调整, 使相位和幅值的调整相互独立, 从而提高参考点的调整效率, 并设计试块对该提离效应抑制方法进行实验验证。实验结果表明: 提离效应经过参考电压相量法抑制后, 缺陷信号幅值可达到提离信号的20倍, 可忽略提离效应对缺陷信号的影响。
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孙振国
蔡栋
李东
张文增
陈强
关键词 涡流检测提离效应参考电压解耦调整    
Abstract:Lift-off affects the signal in eddy current testing. A circuit designed to reduce the lift-off effect adjusts the reference voltage based on an analysis of the influence of the lift-off effect on the probe coil voltage. A dephasing and amplification circuit is used to decouple the phase and amplitude to separate the phase and amplitude adjustments to improve the reference voltage adjustment efficiency. A test specimen is designed to validate the feasibility of the method. Tests indicate that the defect signal amplitude with this method is 20 times larger than the signal from the lift-off effect. The influence of lift- off effect on the defect signal can then be ignored with this circuit.
Key wordseddy current testing    lift-off effect    reference voltage    decoupling adjustment
收稿日期: 2015-06-11      出版日期: 2016-07-01
ZTFLH:  TH878  
引用本文:   
孙振国, 蔡栋, 李东, 张文增, 陈强. 基于参考电压相量法的涡流检测提离效应抑制[J]. 清华大学学报(自然科学版), 2016, 56(6): 622-625,632.
SUN Zhenguo, CAI Dong, LI Dong, ZHANG Wenzeng, CHEN Qiang. Suppressing the lift-off effect in eddy current testing by adjusting the reference voltage. Journal of Tsinghua University(Science and Technology), 2016, 56(6): 622-625,632.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2016.22.022  或          http://jst.tsinghuajournals.com/CN/Y2016/V56/I6/622
  图1 涡流检测简化电路
  图2 复平面相量图
  图3 提离效应有限元仿真模型
  图4 提离引起的探头电压在复平面的变化
  图5 提离引起的探头电压圆曲线拟合
  图6 采用不平衡电桥抑制提离效应的原理图
  图7 参考电压调节过程示意图
  图8 采用移相和幅值放大电路的不平衡电桥原理图
  图9 移相电路和幅值控制电路原理图
  表1 提离效应抑制的实验结果
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