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Anti-symmetric flexural modes for the detection of humidity variation

机译:用于检测湿度变化的反对称弯曲模式

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Antisymmetric flexural (ASF) modes are guided acoustic modes propagating along the apex line of a wedge with particle motion that is antisymmetric about the midplane bisecting the apex angle. This paper describes experimental observations in applying ASF modes for the detection of moisture variation. In our setup, the wedge tip is coated with a thin layer of hygroscopic film for the absorption of moisture, so the phase velocity of the ASF mode is influenced by the changing humidity of the surrounding air. Enhanced by the wedge tip geometry, mass-loading effects on the ASF velocity resulting from the absorption of humidity are pronounced in a low-frequency regime of 0.2 to 2.0 MHz. Numerical models based on finite element analysis are constructed to explain the humidity sensing mechanism.
机译:抗对称挠曲(ASF)模式是沿着楔形的顶点线传播的引导声学模式,其中粒子运动关于围绕等分顶点角度的中平面是反对称的。本文介绍了应用ASF模式检测水分变化的实验观察结果。在我们的设置中,楔形尖端涂有一层吸湿薄膜以吸收水分,因此ASF模式的相速度受周围空气湿度变化的影响。通过楔形尖端的几何形状得到增强,在0.2至2.0 MHz的低频范围内,由于吸收湿气而对ASF速度产生了质量负载效应。建立了基于有限元分析的数值模型来解释湿度传感机理。

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