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首页> 外文期刊>Sensors Journal, IEEE >Differential Sensor Measurement With Rotating Current Excitation for Evaluating Multilayer Structures
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Differential Sensor Measurement With Rotating Current Excitation for Evaluating Multilayer Structures

机译：旋转电流激励下的差分传感器测量，用于评估多层结构

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摘要

Rotating current probe using rotating electromagnetic fields and currents generated by orthogonal excitation coils is required for achieving similar sensitivity to defects in all radial directions around fastener. However, orthogonal excitation scheme only has a single null field point. When using array sensors for rapid inspection, sensors located away from the point measure a strong background field that must be eliminated. This paper presents a new approach using two giant magnetoresistive sensor arrays in a differential configuration to reduce the impact of the background field and increase signal-to-noise ratio. The operation of the differential probe is validated using a finite-element model. A prototype probe was designed, built, and tested. Experimental results obtained using the prototype probe to inspect a two-layer aluminum sample are presented.
机译：为了获得对紧固件周围所有径向方向上的缺陷的相似敏感性，需要使用旋转电磁场和正交激励线圈产生的电流的旋转电流探针。然而，正交激励方案仅具有单个空场点。使用阵列传感器进行快速检查时，远离该点的传感器会测量必须消除的强背景场。本文提出了一种新方法，该方法使用差分配置中的两个巨型磁阻传感器阵列来减少背景磁场的影响并提高信噪比。使用有限元模型验证了差分探头的操作。设计，构建和测试了原型探针。给出了使用原型探针检查两层铝样品获得的实验结果。

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