So far, the diffracted SAW field generated by an IDT with finite aperture on piezoelectric crystal surfaces is usually analyzed phenomenologically with the angular spectrum theory. A major approximation of this theory...So far, the diffracted SAW field generated by an IDT with finite aperture on piezoelectric crystal surfaces is usually analyzed phenomenologically with the angular spectrum theory. A major approximation of this theory is to ignore the vector nature of the field by assuming that the wave field can be represented by a scalar as in optics. In this paper, a rigorous vector field theory of the surface excitation of elastic wave field in piezoelectric crystal developed by the authors is used to evaluate the SAW diffraction field adepately and precisely. As an example, numerical results for YZ-LiNbO3 are presented and compared with those obtained form the angular spectrum theory.展开更多
The acoustic impedance caused by sound radiation at the terminals of the aperture on cylindrical surface is analyzed based upon rigorous sound theory. In low frequency range, the approximate solution of the specific a...The acoustic impedance caused by sound radiation at the terminals of the aperture on cylindrical surface is analyzed based upon rigorous sound theory. In low frequency range, the approximate solution of the specific acoustic resistance is derived. Special treatments are introduced in order to simplify the solution of the specific acoustic reactance. It is verified that the specific acoustic reactance of such an aperture is equal to that of a similar aperture on the infinitely large plane when the small quantities of high order are neglected.展开更多
基金The project is supported by the National Natural Science Foundation of China
文摘So far, the diffracted SAW field generated by an IDT with finite aperture on piezoelectric crystal surfaces is usually analyzed phenomenologically with the angular spectrum theory. A major approximation of this theory is to ignore the vector nature of the field by assuming that the wave field can be represented by a scalar as in optics. In this paper, a rigorous vector field theory of the surface excitation of elastic wave field in piezoelectric crystal developed by the authors is used to evaluate the SAW diffraction field adepately and precisely. As an example, numerical results for YZ-LiNbO3 are presented and compared with those obtained form the angular spectrum theory.
文摘The acoustic impedance caused by sound radiation at the terminals of the aperture on cylindrical surface is analyzed based upon rigorous sound theory. In low frequency range, the approximate solution of the specific acoustic resistance is derived. Special treatments are introduced in order to simplify the solution of the specific acoustic reactance. It is verified that the specific acoustic reactance of such an aperture is equal to that of a similar aperture on the infinitely large plane when the small quantities of high order are neglected.
