论文标题
具有随机不均匀背部材料的宽带超声传感器的FEM建模和模拟
FEM modeling and simulation of broadband ultrasonic transducers with randomized inhomogeneous backing material
论文作者
论文摘要
提出了用于准确设计超声传感器复合背衬的FEM应用。这个想法是要获得钨粉的体积比在环氧基质中用作衬底和最终脉冲的RF信号的钨粉比之间的依赖性。采用了用于背部的不均匀材料模型，而不是经典的复杂几何FEM。该模型是在Comsol 5.5中使用其两个物理界面开发的。第一个基于经典的FEM或连续的Galerkin，用于衬背的超声传播，第二个基于不连续的Galerkin选项，用于流体脉冲传播。通过这种方式，可以避免使用基于阻抗的模型。所得带宽的计算足以通过使用KLM循环模型来预测的1D情况。我们在2D空间中工作，在该空间中，换能器的面部振动远离一维klm模型所假定的活塞样。
A FEM application for the accurate design of composite backing of ultrasonic transducers is presented. The idea is to obtain the dependence between the volume ratio of the tungsten powder in an epoxy matrix used as a backing and the final pulsed RF signal emitted by the backed transducer. An inhomogeneous material model for the backing was adopted instead of the classic complex geometrical FEM. The model was developed in Comsol 5.5 using two of its physics interfaces. The first based on classic FEM or continuous Galerkin for ultrasonic propagation in the backing and the second based on a discontinuous Galerkin option for fluid pulsed propagation. In this way it is possible to avoid the use of an impedance-based model. The calculations for the resulting bandwidth are good enough as predicted for Desilets for the 1D case by using the KLM circuital model. We worked in a 2D space, where the transducer face vibration is far away from the assumed piston-like considered by the unidimensional KLM model.
