Abstract
A theoretical development of the behavior of transient acoustic signals in waveguides, based on a Laplace transform solution of the time-dependent wave equation, yields relatively simple expressions for the acoustic pressure or particle velocity in certain cases, including that of a gated sine wave. A general prediction of the theory that the initial portion of the acoustic packet propagates with the free-field speed of sound, whether the walls of the waveguide are “soft” or “hard,” is experimentally confirmed. This disagrees with the experimental results of Lastovka and Carome [J. Acoust. Soc. Am. 35, 1279 (1963)]. Estimates are also made for the errors introduced by waveguide effects in measusing the speed of sound by echo-superposition techniques. [Work supported in part by U. S. Office of Naval Research.]
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