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High Frequency Models for the NDT Magnetic Field Sensors

机译:NDT磁场传感器的高频模型

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摘要

The usual magnetic field sensors encountered in Non-Destructive Testing (NDT) fall in two main categories: sensors based on induction; sensors based on nonlinearity. This first category is suitable for use at high frequencies, over 100 kHz; at low frequency these sensors have low sensitivity and the measurements are affected by noise. The second category is suitable for low frequency, these sensors being able to measure magnetic fields down to DC. The attempt to use FLUXSET- and FLUXGATE-type sensors at high frequencies leads to parasitic effects which limit their frequency domain. However, for industrial application it is desirable to dispose of a sensor which has a frequency domain as extended as possible, in order to allow defects detection at various depths.
机译:非破坏性测试(NDT)中遇到的常见磁场传感器分为两大类:基于感应的传感器;基于感应的传感器;基于传感器的传感器。基于非线性的传感器。第一类适用于100 kHz以上的高频;在低频下,这些传感器的灵敏度较低,并且测量值会受到噪声的影响。第二类适用于低频,这些传感器能够测量低至直流的磁场。尝试在高频下使用FLUXSET和FLUXGATE类型的传感器会导致寄生效应,从而限制了它们的频域。然而,对于工业应用,期望布置具有尽可能扩展的频域的传感器,以便允许在各种深度处检测缺陷。

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