Modeling and Analysis of Noise Sources for Thin-Film Magnetoelectric Sensors Based on the Delta-E Effect
Modeling and Analysis of Noise Sources for Thin-Film Magnetoelectric Sensors Based on the Delta-E Effect
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DOI：
10.1109/tim.2017.2709478
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发表时间：
2017-10-01
影响因子：
5.6
通讯作者：
Hoeft, Michael
中科院分区：
文献类型：
--
作者：
Durdaut, Phillip;Reermann, Jens;Hoeft, Michael
提出了一种用作磁场传感器的机电谐振器的综合噪声模型。悬臂式传感器被覆盖了一层磁致伸缩薄膜，该薄膜显示出弹性模数E随着磁场的变化而变化，从而使谐振器失谐--即所谓的Delta-E效应。噪声模型包含来自操作电子设备、布线和传感器本身的所有相关噪声源。测量结果表明，在一个特定的激励电压下，当出现一个额外的主要噪声源时，符合得很好。它被鉴定为起源于磁性薄膜。结合模型计算结果，讨论了这类传感器的工作参数。该模型预测，如果消除磁噪声，现有传感器在10赫兹的检测极限可提高到60pT/(Hz)(1/2)。
We present a comprehensive noise model for an electromechanical resonator that is utilized as a magnetic field sensor. The cantilever-type sensor is coated with a magnetostrictive film that exhibits a change in elastic modulus E with a magnetic field and therefore detunes the resonator-the so-called delta-E effect. The noise model contains all relevant noise sources from the operational electronics, the wiring, and the sensor itself. Measurements show good agreement up to a certain excitation voltage, where an additional dominant noise source appears. It is identified as originating from the magnetic film. With the results of the model, the operational parameters of such sensors are discussed. The model predicts that the limit of detection at 10 Hz for the present sensors can be improved to 60 pT/(Hz)(1/2) if the magnetic noise is eliminated.