Accession Number : ADA258472
Title : A Study of Pulse Scattering in a Waveguide
Descriptive Note : Final rept.
Corporate Author : NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
Personal Author(s) : Broadhead, Michael K ; Werby, Michael F ; Ali, Hassan B
Report Date : 26 Oct 1992
Pagination or Media Count : 5
Abstract : The problem of the scattering of a continuous acoustic wave(CW)from a submerged object in a waveguide has received extensive treatment in the frequency domain, where phenomena associated with the resonant behavior of the object have been studied in detail. This paper concentrates on the time-domain interpretation of the scattering problem. Computation of the scattered field from an incident pulse, which requires calculations for many frequencies, is performed using a new perturbation technique (computed to all orders that allows rapid calculation of the waveguide modes. An implementation of the inverse Fourier transform is presented that is more appropriate to resonance-type spectra. The computational tools developed are used to elucidate various physical aspects of pulse scattering in a waveguide, including: group velocity behavior, direct modal contributions, and resonance contributions from individually excited modes. Acoustic scattering, shallow water, waveguide propagation.
Descriptors : *ACOUSTIC WAVES , *SHALLOW WATER , *UNDERWATER ACOUSTICS , *ACOUSTIC SCATTERING , *TIME DOMAIN , VELOCITY , REPRINTS , PULSES , RESONANCE , INVERSE SCATTERING , PERTURBATIONS , WAVE PROPAGATION , GROUP VELOCITY , WAVEGUIDES , OCEAN WAVES
Subject Categories : Acoustic Detection and Detectors
Distribution Statement : APPROVED FOR PUBLIC RELEASE