Mukhin Nikolay, Kutia Mykhailo, Aman Alexander, Steinmann Ulrike, Lucklum Ralf
Institute for Automation Technology, Otto von Guericke University of Magdeburg, 39106 Magdeburg, Germany.
NanoFract UG, 39106 Magdeburg, Germany.
Sensors (Basel). 2022 Apr 6;22(7):2816. doi: 10.3390/s22072816.
We show new approaches to developing acoustic liquid sensors based on phononic crystals. The proposed phononic crystal integrates fluidic elements. A solid block with periodic cylindrical holes contains a defect-a liquid-filled cylindrical cavity. We pay attention to acoustic excitation and the readout of the axisymmetric cylindrical resonator eigenmode of the liquid-filled defect in the middle of the phononic crystal structure. This mode solves the challenge of mechanical energy losses due to liquid viscosity. We also analyze the coupling effects between oscillations of liquid and solid systems and consider coupling issues between piezoelectric transducers and the liquid-filled cavity resonator. The numerical simulation of the propagation of acoustic waves through the phononic crystal sensor was carried out in COMSOL Multiphysics Software. The phononic crystal was made of stainless steel with mechanically drilled holes and was fabricated for experimental verification. We show that a tuning of the solid-liquid vibrational modes coupling is the key to an enhanced level of sensitivity to liquid properties. Besides (homogeneous) water-propanol mixtures, experimental studies were carried out on (disperse) water-fuel emulsions.
我们展示了基于声子晶体开发声学液体传感器的新方法。所提出的声子晶体集成了流体元件。一个带有周期性圆柱孔的固体块包含一个缺陷——一个充满液体的圆柱腔。我们关注声激发以及声子晶体结构中间充满液体的缺陷的轴对称圆柱谐振器本征模的读出。这种模式解决了由于液体粘度导致的机械能损失的挑战。我们还分析了液体和固体系统振荡之间的耦合效应，并考虑了压电换能器与充满液体的腔谐振器之间的耦合问题。通过COMSOL Multiphysics软件对声波通过声子晶体传感器的传播进行了数值模拟。声子晶体由带有机械钻孔的不锈钢制成，并制造出来用于实验验证。我们表明，固液振动模式耦合的调谐是提高对液体性质敏感度的关键。除了（均匀的）水 - 丙醇混合物外，还对（分散的）水 - 燃料乳液进行了实验研究。
