A rigorous analysis of surface acoustic wave (SAW) reflection and scattering by electrodes is of paramount impor- tance in the design of SAW identification tags and sensors. In this paper, a new method based on Green...A rigorous analysis of surface acoustic wave (SAW) reflection and scattering by electrodes is of paramount impor- tance in the design of SAW identification tags and sensors. In this paper, a new method based on Green’s function concept is used to study reflection and scattering coefficients. By this method the reflection coefficient with its phase angle, transmission coeffi- cient, and bulk wave scattering coefficient, can be obtained rapidly and accurately. To get precise result, the influence of static charge must be taken into account. In the work, we successfully cancelled out the effect of static charge and the validity of the results was checked. As an example, the reflection, transmission and scattering coefficients of a single grounded electrode on 128° YX LiNbO3 is shown.展开更多
In this paper,the reflection phenomenon of a vapor shock front(both sides of the front are in the vapor phase)in a van der Waals fluid is considered.Both the1-dimensional case and the multidimensional case are investi...In this paper,the reflection phenomenon of a vapor shock front(both sides of the front are in the vapor phase)in a van der Waals fluid is considered.Both the1-dimensional case and the multidimensional case are investigated.The authors find that under certain conditions,the reflected wave can be a single shock,or a single subsonic phase boundary,or one weak shock together with one subsonic phase boundary,which depends on the strength of the incident shock.This is different from the known result for the reflection of shock fronts in a gas dynamical system due to Chen in 1989.展开更多
基金Project (Nos. 10074034 and 10304012) supported by the NationalNatural Science Foundation of China
文摘A rigorous analysis of surface acoustic wave (SAW) reflection and scattering by electrodes is of paramount impor- tance in the design of SAW identification tags and sensors. In this paper, a new method based on Green’s function concept is used to study reflection and scattering coefficients. By this method the reflection coefficient with its phase angle, transmission coeffi- cient, and bulk wave scattering coefficient, can be obtained rapidly and accurately. To get precise result, the influence of static charge must be taken into account. In the work, we successfully cancelled out the effect of static charge and the validity of the results was checked. As an example, the reflection, transmission and scattering coefficients of a single grounded electrode on 128° YX LiNbO3 is shown.
基金supported by the National Natural Science Foundation of China(No.10901107)the Innovation Program of Shanghai Municipal Education Commission(No.213ZZ136)
文摘In this paper,the reflection phenomenon of a vapor shock front(both sides of the front are in the vapor phase)in a van der Waals fluid is considered.Both the1-dimensional case and the multidimensional case are investigated.The authors find that under certain conditions,the reflected wave can be a single shock,or a single subsonic phase boundary,or one weak shock together with one subsonic phase boundary,which depends on the strength of the incident shock.This is different from the known result for the reflection of shock fronts in a gas dynamical system due to Chen in 1989.
