Engineering Research Center for Functional Ceramics of the Ministry of Education, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.
Institute of Electrical Engineering, Chinese Academy of Sciences, No. 6 Beiertiao, Zhongguancun, Beijing 100190, China.
Sensors (Basel). 2018 Nov 16;18(11):3988. doi: 10.3390/s18113988.
An accurate and fast simulation tool plays an important role in the design of wireless passive impedance-loaded surface acoustic wave (SAW) sensors which have received much attention recently. This paper presents a finite transducer analysis method for wireless passive impedance-loaded SAW sensors. The finite transducer analysis method uses a numerically combined finite element method-boundary element method (FEM/BEM) model to analyze non-periodic transducers. In non-periodic transducers, FEM/BEM was the most accurate analysis method until now, however this method consumes central processing unit (CPU) time. This paper presents a faster algorithm to calculate the bulk wave part of the equation coefficient which usually requires a long time. A complete non-periodic FEM/BEM model of the impedance sensors was constructed. Modifications were made to the final equations in the FEM/BEM model to adjust for the impedance variation of the sensors. Compared with the conventional method, the proposed method reduces the computation time efficiently while maintaining the same high degree of accuracy. Simulations and their comparisons with experimental results for test devices are shown to prove the effectiveness of the analysis method.
在设计最近受到广泛关注的无线无源阻抗加载声表面波（SAW）传感器时，准确且快速的仿真工具扮演着重要的角色。本文提出了一种用于无线无源阻抗加载 SAW 传感器的有限换能器分析方法。有限换能器分析方法使用数值组合的有限元法-边界元法（FEM/BEM）模型来分析非周期性换能器。在非周期性换能器中，FEM/BEM 是迄今为止最准确的分析方法，但这种方法需要消耗大量的中央处理单元（CPU）时间。本文提出了一种更快的算法来计算方程系数的体波部分，该部分通常需要很长时间。构建了完整的阻抗传感器非周期性 FEM/BEM 模型。对 FEM/BEM 模型中的最终方程进行了修改，以调整传感器的阻抗变化。与传统方法相比，所提出的方法在保持相同高精度的同时，有效地减少了计算时间。通过对测试器件的仿真及其与实验结果的比较，证明了该分析方法的有效性。
