磁感应层析成像技术识别物体成分
Identification of object composition with Magnetic Inductive Tomography
摘要：
物体对振荡磁场的感应响应揭示了关于其电导率和磁导率的信息。在这里，我们介绍了一种技术，使用测量的角度，频率和空间依赖的感应信号，以确定对象的组成。识别是通过参考物体对具有互斥特性的材料的感应响应来进行的，这些材料包括铜（高导电性，可忽略的磁导率）和铁氧体（可忽略的导电性，高磁导率）。该技术使用具有各向异性灵敏度的传感器来区分涡流和磁化驱动对象响应的不同特征。通过射频原子磁力仪的磁感应成像测量，对该方法进行了实验验证。讨论了该技术在安全检查设备中的可能应用。
英文摘要：
The inductive response of an object to an oscillating magnetic field reveals information about its electrical conductivity and magnetic permeability. Here we introduce a technique that uses measurements of the angular, frequency and spatial dependence of the inductive signal to determine object composition. Identification is performed by referencing an object's inductive response to that of materials with mutually exclusive properties such as copper (high electric conductivity, negligible magnetic permeability) and ferrite (negligible electric conductivity, high magnetic permeability). The technique uses a sensor with anisotropic sensitivity to discriminate between the different characters of the eddy current and magnetisation driven object responses. Experimental validation of the method is performed through Magnetic Induction Tomography measurement with a radio-frequency atomic magnetometer. Possible applications of the technique in security screening devices are discussed.
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