Showing papers on "Acoustic source localization published in 1968"
TL;DR: In this paper, the authors derived an expression for the force exerted on a spherical bubble by the sound field, and experimental results were presented in support of the theory, and proved that the expression is correct.
Abstract: Bubbles can be trapped by a standing sound wave in a liquid. An expression is derived for the force exerted on a spherical bubble by the sound field, and experimental results are presented in support of the theory.
146 citations
44 citations
27 citations
TL;DR: The range of a sound source of unknown strength can be calculated from measured interaural differences in the time of arrival and intensity of a brief sound, and the possibility that the brain performs this calculation is discussed.
Abstract: The range of a sound source of unknown strength can be calculated from measured interaural differences in the time of arrival and intensity of a brief sound. The possibility that the brain performs this calculation is discussed, and an experiment to determine human range perception is proposed.
18 citations
TL;DR: In this paper, the total acoustic power radiated by a source is measured by integration of the square of the sound pressure over the surface of a sphere which is concentric with the source and has its surface in the far acoustic field.
Abstract: The total acoustic power radiated by a source is measured by integration of the square of the sound pressure over the surface of a sphere which is concentric with the source and has its surface in the far acoustic field. The squaring device is a Hall effect multiplier and the integrator is a high gain d.c. amplifier with capacitive feedback. Details of the source directivity may be recorded automatically as the power measurement is made.
2 citations
01 Jan 1968
TL;DR: In this paper, a qualitative study of wave propagation in an inhomogeneous medium principally by geometrical optics and ray theory is given, and a more penetrating quantitative study is done by means of analytical techniques on the governing equations.
Abstract: This paper is in two parts. In the first part we give a qualitative study of wave propagation in an inhomogeneous medium principally by geometrical optics and ray theory. The inhomogeneity is represented by a sound-speed profile which is dependent upon one coordinate, namely the depth; and we discuss the general characteristics of wave propagation which result from a source placed on the sound channel axis. We show that our mathematical model of the sound- speed in the ocean actually predicts some of the behavior of the observed physical phenomena in the underwater sound channel. Using ray theoretic techniques we
investigate the implications of our profile on the following characteristics of SOFAR propagation: (i) the sound energy traveling further away from the axis takes less time to travel from source to receiver than sound energy traveling closer to the axis, (ii) the focusing of sound energy in the sound channel at certain ranges, (iii) the overall ray picture in the sound channel. In the second part a more penetrating quantitative study is done by means of analytical techniques on the governing equations. We study the transient problem for the Epstein profile by employing a double transform to formally derive an integral representation for the acoustic pressure amplitude, and from this representation we obtain several
alternative representations. We study the case where both source and receiver are on the channel axis and greatly separated. In particular we verify some of the earlier results derived by ray theory and obtain asymptotic results for the acoustic pressure in the far-field.
1 citations