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


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a258472.pdf


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
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE