The longitudinalshift varies with the incidence Angle, and the time delay and the variations in the intensity and the time-width depend on the dispersion of the material.
反射光束的纵向位移量随入射角变化而变化，光束的时间移动、强度和宽度的变化与色散系数有关。
2
A method of calculating the waveguide invariant based on the frequency-shift compensation method, which is used to improve the longitudinal correlations of acoustic fields, is developed in this paper.