Weak scattering of sound waves in random media that have arbitrary power-law spectra / D. Keith Wilson.

Format:

Book

Government document

Author/Creator:

Wilson, D. Keith

Contributor:

U.S. Army Research Laboratory

Series:

ARL-TR (Aberdeen Proving Ground, Md.) ; 1866.

ARL-TR ; 1866

Language:

English

Subjects (All):

Sound-waves--Scattering.

Sound-waves.

Physical Description:

1 online resource (iv, 19 pages)

Place of Publication:

Adelphi, MD : U.S. Army Research Laboratory, [1999]

Summary:

Log-amplitude and phase variances of a weakly scattered acoustic signal are calculated for line-of-sight propagation through a random medium. The spectrum of the index-of-refraction fluctuations in the random medium is assumed to scale in proportion to the wavenumber raised to an arbitrary power in the limit of large wavenumbers (small spatial scales). Both scalar and vector contributions to the index of refraction are considered. Most of the calculated results reduce to those given by Tatarskii (1971) and Ostashev (1994) when the power law exponent is -5/3, which is the value characteristic of turbulence. However, the results do not exactly reduce to an equation given by Flatte et al (1994) for the log-amplitude variance in terms of strength and diffraction parameters. The equation from Flatte et al is shown to be an approximation, strictly valid only when the spectral energy in the random medium is concentrated at a well-defined outer scale.

Notes:

Title from title screen (viewed on April 8, 2011).

"March 1999."

Includes bibliographical references (page 16).

Other Format:

Print version: Weak scattering of sound waves in random media that have arbitrary power-law spectra

OCLC:

227893960

Access Restriction:

Approved for public release.