Nonlinear Parametric Transduction in Underwater Acoustics.
Abstract
Over the past decade, nonlinear acoustics has experienced and unprecedented expansion in theory, experiment, and application. This vigorous activity has its roots in Westervelt's theoretical discovery of the parametric acoustic array (1960). This type of transducer uses the nonlinear properties of the water itself to produce a low frequency, superdirective radiation from the parametric interaction of two high frequency generating waves. The superdirective radiation so created is a wide band entity having no spatial diffraction lobes. Several practical applications of parametric arrays are now emerging; these include bathymetric profiling, the location of artifacts in marine archeology, ultrasonic imaging and biomedical diagnostics, and measurements on waveguide propagation in shallow water. This paper will survey some of the fundamentals underlying these phenomena and will demonstrate their behavior and their application by presenting experimental results.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 15, 1975
- Accession Number
- ADA008203
Entities
People
- Thomas G. Muir
Organizations
- University of Texas at Austin