The Scattering of Sound from a Prolate Spheroid

Spence, R. D.; Granger, Sara

doi:10.1121/1.1906827

Cited by 66 publications

(26 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Goodman and Stern (1962) addressed the problem of scattering by elastic spherical shells in which the material properties of the surrounding medium and the interior of the shell differ from the shell itself. Since scattering from simple spherical and infinitely long cylinders is not suffcient to describe scattering from realistic scatterers found in nature, scattering by prolate spheroids has been investigated by Spence and Granger (1951), Weston (1967), Yeh (1967), Furusawa (1988) and Ye et aL. (1997).…”

Section: General Scatteringmentioning

confidence: 99%

Acoustic scattering by axisymmetric finite-length bodies with application to fish : measurement and modeling

Reeder¹

2002

View full text Add to dashboard Cite

This thesis investigates the complexities of acoustic scattering by finite bodies in general and by fish in particular through the development of an advanced acoustic scattering model and detailed laboratory acoustic measurements. A general acoustic scattering model is developed that is accurate and numerically effcient for a wide range of frequencies, angles of orientation, irregular axisymmetric shapes and boundary conditions. The model presented is an extension of a two-dimensional conformal mapping approach to scattering by irregular, finite-length bodies of revolution. An extensive series of broadband acoustic backscattering measurements has been conducted involving alewife fish (Alosa pseudoharengus), which are morphologically similar to the Atlantic herring (Clupea harengus). A greater-than-octave bandwidth (40-95 kHz), shaped, linearly swept, frequency modulated signal was used to insonify live, adult alewife that were tethered while being rotated in 1-degree increments over all angles of orientation in two planes of rotation (lateral and dorsal/ventral). Spectral analysis correlates frequency dependencies to morphology and orientation. Pulse compression processing temporally resolves multiple returns from each individual which show good correlation with size and orientation, and demonstrate that there exists more than one significant scattering feature in the animaL. Imaging technologies used to exactly measure the morphology of the scattering features of fish include very highresolution Phase Contrast X-rays (PCX) and Computerized Tomography (CT) scans, which are used for morphological evaluation and incorporation into the scattering modeL. Studies such as this one, which combine scattering models with high-resolution morphological information and high-quality laboratory data, are crucial to the quantitative use of acoustics in the ocean.

show abstract

Section: General Scatteringmentioning

confidence: 99%

Acoustic scattering by axisymmetric finite-length bodies with application to fish : measurement and modeling

Reeder¹

2002

View full text Add to dashboard Cite

show abstract

“…The scattering and radiation of acoustic waves by a prolate spheroid were mostly investigated through the use of spheroidal coordinates and spheroidal wave functions. [3][4][5][6][7] The relationship between the motion of a rigid prolate spheroidal obstacle and the strength of a transient incident sound wave was first computed by Sidman;8 however, previous work only deals with one special case that the incident waves propagate along the major axis.…”

Section: Introductionmentioning

confidence: 99%

Motion of a rigid prolate spheroid in a sound wave field

Zhou

Hong

2014

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

The motions of a rigid and unconstrained prolate spheroid subjected to plane sound waves are computed using preliminary analytic derivation and numerical approach. The acoustically induced motions are found comprising torsional motion as well as translational motion in the case of acoustic oblique incidence and present great relevance to the sound wavelength, body geometry, and density. The relationship between the motions and acoustic particle velocity is obtained through finite element simulation in terms of sound wavelengths much longer than the overall size of the prolate spheroid. The results are relevant to the design of inertial acoustic particle velocity sensors based on prolate spheroids.

show abstract

“…For the first time the problem of acoustic wave scattering on elongated spheroids was stated in works [Cpence & Ganger, 1951], [Burke, 1966], [Kleshchyov & Sheiba, 1970]. Work [Cpence & Ganger, 1951] considers the problem of sound scattering on a elongated spheroid with various boundary conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Work [Cpence & Ganger, 1951] considers the problem of sound scattering on a elongated spheroid with various boundary conditions. Work [Burke, 1966] considers the problem of sound scattering on a rigid spheroid in the long-wave approximation.…”

Section: Introductionmentioning

confidence: 99%