Effect of Crack Length and Lift-Off Distance on Eddy Current Sensor Array′s Output Characteristics
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摘要: 分析了涡流阵列检测技术的基本原理,利用有限元方法建立了一种涡流阵列传感器的仿真模型,分析了裂纹长度和提离距离对传感器输出特性的影响.结果表明,裂纹的出现会导致感应线圈输出信号的幅值和相位发生变化,随着裂纹长度的增加,感应线圈的输出信号幅值和相位逐渐增加;随着提离距离的增加,传感器的输出信号幅值和相位也急剧增加.将该传感器应用于裂纹长度检测时,应尽量抑制提离距离的波动.Abstract: The basic principles of eddy current array inspecting method were analyzed at first.Then a simulation model of an eddy current array probe was established based on finite element method.The influences of crack length and lift-off distance on output characteristics were analyzed.It was shown that there would be a change on amplitude and phase of output signal when a crack appeared below the footprint of sensing coil in metal structures,and the amplitude and phase of sensing coil was increasing gradually as crack propagation.Besides,there would be a sharp increment of amplitude and phase as lift-off distance increased.The sensor could be applied in crack inspection and distance measurement,but the variation of lift-off distance should be restricted in crack inspecting.
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Keywords:
- Eddy current array sensor /
- Crack length /
- Lift-off distance /
- Output characteristic
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