A contact resonance viscometer based on the electromechanical impedance of a piezoelectric cantilever
A contact resonance viscometer based on the electromechanical impedance of a piezoelectric cantilever
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基于压电悬臂梁机电阻抗的接触共振粘度计
DOI：
10.1016/j.sna.2017.10.041
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发表时间：
2017-11-01
影响因子：
4.6
通讯作者：
Li, Faxin
中科院分区：
文献类型：
--
作者：
Wang, Gang;Tan, Chi;Li, Faxin
在这项工作中，我们提出了一种自感知接触谐振粘度计的基础上的机电阻抗的压电双晶片悬臂梁的自由端是垂直连接的传感片。在测量过程中，传感片浸没在流体中，由压电悬臂梁激励面内振动。分析了流体负载的机械阻抗，并利用等效电路模型推导了流体负载-流体系统的机电阻抗。然后跟踪压电双晶片的电阻抗，根据谐振频率和品质因数的变化，提取被测流体的动态粘度。使用不同浓度（10-2000 cP）的甘油-水溶液进行校准实验。最后，利用标定曲线对橄榄油和硅油的粘度进行了测定，结果与标准粘度计的测定结果基本一致。该方法具有高品质因数和自检测特性，特别适用于高粘度流体粘度的在线测量。(C)2017爱思唯尔B. V.保留所有权利。
In this work, we proposed a self-sensing contact resonance viscometer based on the electromechanical impedance of a piezoelectric bimorph cantilever whose free end is perpendicularly attached by a sensing slice. During measurement, the sensing slice is immersed into the fluid and excited in-plane vibration by the piezoelectric cantilever. The mechanical impedance from the fluid load is analyzed and the electromechanical impedance of the cantilever-fluid system is derived by using an equivalent circuit model. Then we track the electric impedance of piezoelectric bimorph to extract the dynamic viscosity of the testing fluid, based on the shift of the resonance frequency and the quality factor. Calibration experiments were carried out using glycerol-water solutions with different concentrations (10-2000 cP). Finally, the viscosities of olive oil and silicon oil were measured using the calibrated curves, and the results coincided with that given by the standard viscometer. The proposed method is very promising for online viscosity measurement, especially for high-viscosity fluid, due to its high quality factor and self-sensing characteristic. (C) 2017 Elsevier B.V. All rights reserved.