The frequency response of magnetoelastic sensors to stress and atmospheric pressure
The frequency response of magnetoelastic sensors to stress and atmospheric pressure
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DOI：
10.1088/0964-1726/9/6/320
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发表时间：
2000-12-01
影响因子：
4.1
通讯作者：
Grimes, CA
中科院分区：
文献类型：
--
作者：
Kouzoudis, D;Grimes, CA
早期的工作表明，磁致弹性厚膜传感器的特征谐振频率线性向下移动，以响应增加的大气压力。本文详细介绍了响应机制，并表明其是压力和传感器机械应力方式的函数。在弹性或塑性状态下对传感器施加应力会引起平面外振动，该平面外振动充当对由询问场激发的纵向传感器振荡的压力相关阻尼力。该阻尼力继而响应于增加的压力而将磁致弹性传感器的谐振频率移得更低。
Earlier work demonstrated that the characteristic resonant frequency of magnetoelastic thick-film sensors shifts linearly downwards in response to increasing atmospheric pressure. In this paper, the response mechanism is detailed and shown to be a function of both pressure and the way that the sensor is mechanically stressed. Stressing the sensor, in either the elastic or plastic regime, induces out-of-plane vibrations that act as a pressure-dependent damping force to the longitudinal sensor oscillations excited by the interrogation field This damping force, in rum, acts to shift the resonant frequency of the magnetoelastic sensor lower in response to increasing pressure.