Negative coefficients occur where there is a decrease in acoustic impedance across the reflecting interface.
当反射界面上下两侧的声波组抗降低时，反射系数就会出现负值。
2
An interface between layers of contrasting acoustic, optical or electromagnetic properties.
具有不同的声学、光学或电磁学特征的层之间的界面。
3
For scattering of a bounded acoustic beam from a liquid-solid interface, the principal difficulty comes from the treatment of tie plane wave reflection coefficient.