乐甫波结冰状态监测的响应机理分析

提出了将冰层进行多孔介质等效方法,对冰层、液体/波导层/压电基底多层乐甫(Love)波导结构建立分层介质模型,利用部分波理论和边界条件精确推导,分析不同状态下的传感响应,求解结冰过程Love波速度及声波衰减的变化,获得结冰过程中的声学传感机制。为了验证理论分析,实验制作了200 MHz的36°LiTaO₃/SiO₂波导结构的Love波器件,并构建模拟环境的试验系统对研制器件进行了实验测试。实验结果表明,利用Love波的工作频率以及插入损耗瞬变这一特征可以实现对结冰状态的准确监测。

Response mechanism of ice condition monitoring based on Love wave

A porous medium equivalent method for ice layer is proposed and a layered medium model for ice layer,liquid/waveguide layer/piezoelectric substrate multilayer Love waveguide structure is established.By using partial wave theory and boundary conditions to accurately derive and analyze the different conditions sensing response,the changes of Love wave velocity and acoustic wave attenuation during the icing process is obtained.In order to verify the theoretical analysis,a Love wave device with a 200 MHz 36°LiTaO₃/SiO₂ waveguide structure is fabricated experimentally,and an experimental system that simulates the environment is constructed to test the developed device.The experimental results show that the working frequency of Love wave and the characteristics of insertion loss transient can be used to accurately monitor the icing state.