Elliptical Acoustic Particle Motion in Underwater Waveguides
Abstract
The degree of circularity is a vector quantity relating to the acoustic particle motion induced in an acoustic field, and is formulated by measurements of the acoustic particle velocity or the complex vector intensity. It characterizes the ellipticity of the particle motion path that, for example, can arise when there is interference between a source signal and its reflections. In an ocean waveguide the spatial dependence of this vector property depends on the water column sound-speed, surface conditions and bottom properties, in addition to the source/receiver geometry. In waveguides with nearly horizontal boundaries, the vertical component of the instantaneous intensity can be used to provide an approximation to the degree of circularity. This approximation, applied to acoustic pressure measurements from two closely spaced hydrophones made in 2006 off the New Jersey coast in waters 80 m deep, is used to invert for environmental parameters of the sediment structure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 27, 2013
- Accession Number
- ADA581793
Entities
People
- David R. Dall'osto
- Peter Hans Dahl
Organizations
- University of Washington