Louis Goodman
Diane Sargowicz
Naval Undersea Warfare Ctr., Newport, RI 02841
John Oeschger
Steven Letcher
Univ. of Rhode Island, Kingston, RI 02881
Peter Hebda
Americom Corp.
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.