Research on Phase Characteristics of Parametric Sound Field in Water Medium

The phase control of parametric array is a new application direction. The phase characteristic mechanism of parametric sound field is analyzed. The phase characteristics of parametric acoustic source in the interaction region of primary wave in surface seawater are researched by means of contrast measurement. The unique law of phase change in parametric field is obtained. The phase of the difference frequency wave of the parametric array is stable under good sea conditions, which is fluctuated randomly under wind and wave conditions. Due to the sound velocity dispersion of the medium, the phase difference between the parametric sound field and the conventional sound field increases with the propagation distance, which can reach tens of degrees under worse sea conditions.