Shah V V, Balasubramaniam K
Department of Aerospace Engineering, Mississippi State University, MS 39762, USA.
Ultrasonics. 2000 Sep;38(9):921-7. doi: 10.1016/s0041-624x(00)00033-0.
In this paper, an acoustic shear impedance model is employed to obtain a relation between the viscosity of a Newtonian fluid and phase characteristics of ultrasonic shear wave reflection from a solid-fluid interface. The phase and magnitude of the reflection coefficient can be decoupled in this model. The decoupling allows an independent relation between the acoustic shear impedance (viscosity-density product) and phase of the reflection coefficient. The model was experimentally verified for different fluid-solid combinations. Comparison of the results with the commonly used absolute reflection coefficient method demonstrates that phase measurement provides improved measurements.
在本文中，采用声学剪切阻抗模型来获得牛顿流体的粘度与超声剪切波从固液界面反射的相位特性之间的关系。在该模型中，反射系数的相位和幅度可以解耦。这种解耦使得声学剪切阻抗（粘度-密度乘积）与反射系数的相位之间存在独立的关系。该模型针对不同的液固组合进行了实验验证。将结果与常用的绝对反射系数方法进行比较表明，相位测量提供了更精确的测量结果。
