Analysis of the Anomalous Transparency Effect of the Water–Air Interface

The effect of anomalous transparency on the passage of sound from water to air is considered. A mathematical model is used to calculate the coefficient of pressure transmission through the water–air interface taking into account the influence of inhomogeneous plane waves. The features of the acoustic field in air are shown for an underwater source located at a distance from the media interface smaller than the wavelength. The theoretical dependences of the pressure transmission coefficient on the wave distance from the source to the interface are given. The conditions and methods for measuring the coefficient of transmission of spherical waves through a planar interface are described. The experimental dependences of the pressure transmission coefficient on the radiation frequency and depth of the source are presented. Oscillograms of acoustic signals transmitted from water to air are shown.