Parametric Acoustic Receiving Array

Abstract

Equations are presented which describe an analytical model of the parametric receiving array and the calculated results are compared to experimental data. Beam patterns and signal levels achieved with an experimental parametric receiving array are presented to extend the ranges and frequencies of previous work conducted in model tanks to parameters of practical significance.

Aspects of Nonlinear Acoustics

“…From (41) it appears that the shock thickness will decrease for increasing Γ, leading to Δ -> 0 for Γ -> °°. In this limit the solution becomes discontinuous at and describes a real sawtooth expressed by:…”

“…Farfield reception was considered by Barnard et al [41] who studied a first-order sound field consisting of a 'low-amplitude', spherical, harmonic pump wave of frequency f 1 and a plane, harmonic signal wave of frequency f 2 , (f 1 > f 2 ). No nearfield effects of the pump were assumed to be involved and only the pump wave was assumed undergoing absorption (viscous).…”