Abstract
High-frequency backscattering spectra have been computed for two air-filled sacs at 51-atm ambient pressure by means of the boundary-element method. One applies to the swimbladder of a 39-cm-long specimen of pollack (Pollachius pollachius), with known morphometry expressed in a 3181-node mesh. The other applies to a prolate ellipsoid, whose major axis is that of the mapped swimbladder, 14.1 cm, and whose minor axis, 1.24 cm, has been determined so that the volume of the ellipsoid is essentially identical to that of the mapped swimbladder. The dorsal-aspect backscattering cross section of each sac has been computed at each frequency over a normal distribution of tilt angles, measured relative to the longitudinal or major axis, with mean −4.4 deg and standard deviation 16 deg. Computations have been performed over the frequency range 20–40 kHz in increments of 25 Hz. The spectra are characterized and compared. [Work supported by ONR.]
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