ABSTRACT
In ultrasonics, spherical waves are often encountered in addition to plane waves. Spherical waves are formed in the far zone of real plane ultrasonic radiators, as well as in the near zone of spherical radiators. This chapter discusses the characteristics and singularities of the propagation of spherically symmetric waves, i.e., waves whose acoustic parameters depend on the distance from a center. The phase difference between the pressure and velocity in a spherical wave leads to singularities in the expressions for the intensity of the wave.
