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A new NDT method based on permanent magnetic field perturbation

机译:基于永久磁场扰动的无损检测新方法

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摘要

On the basis of permanent magnet, perpendicular oriented to the surface of the component under inspection and surrounded by a pick-up coil, the so-called PMFP-effect (permanent magnetic field perturbation-effect) can be observed when the magnet is moved in this perpendicular position with a well defined lift-off along the surface and a surface-breaking or near-surface - but hidden - defect is coming into the influence range of the magnetic field. A new NDT (nondestructive testing) technique by using PMFP so can be proposed for the first time, and its detection mechanism is presented and analyzed by simulations. Afterwards, its testing characteristics for defects are given and its feasibility is further confirmed by experiments. Meantime and particularly, its inspection depth and the effect of the position and attitude of PMFP sensors on inspection signals are analyzed. Accordingly, a multi-differential method used for improving signal-to-noise rate is presented and some testing apparatus using PMFP method is developed. Finally, the proposed PMFP method is discussed specially compared to MFL in detail.
机译:在永磁体的基础上,该永磁体垂直于被检组件的表面并被一个拾波线圈围绕,当磁体向内移动时,可以观察到所谓的PMFP效应(永久磁场扰动效应)。这种垂直位置具有沿表面的清晰剥离,并且表面破裂或接近表面(但隐藏)的缺陷正在进入磁场的影响范围。因此,可以首次提出一种新的利用PMFP的NDT(无损检测)技术,并提出了其检测机理并通过仿真进行了分析。然后,给出了缺陷的测试特性,并通过实验进一步证实了其可行性。同时,特别是分析了其检查深度以及PMFP传感器的位置和姿态对检查信号的影响。因此,提出了一种用于提高信噪比的多微分方法,并且开发了一些使用PMFP方法的测试设备。最后,对所提出的PMFP方法与MFL进行了详细讨论。

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