Naval Undersea Warfare Ctr., Newport, RI 02841
Univ. of Rhode Island, Kingston, RI 02881
Acoustic scattering that satisfies the far-field Born approximation leads to a simple linear relationship between the scattered pressure field and the scattering field, namely the two are Fourier transform pairs. A set of laboratory experiments have been devised to exploit this relationship for the case of scattering from a turbulent field. Data are taken in a multiple scattering angle configuration such that the Bragg wave-number vector associated with each scattering angle pair is in the same direction. Use of broad bandwidth source and receiver transducers (250 to 750 kHz) then allows a three-dimensional fully resolved wave-number spectra of the turbulent field to be estimated. Results are presented for scattering from a turbulent buoyant plume. The data can also be used to examine the validity of the fundamental assumption of the far-field Born approximation.