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On Frequency Dependent Back-Scattering of an Acoustic Wave Train in the Atmosphere

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The frequency dependent scattering of acoustic waves in the atmosphere is shown to induce a non-doppler frequency shift in the scattered energy of a finite duration acoustic wave train. Transient departures from the Kolmogorov turbulence law over small wave number ranges are proposed; these departures result in acoustic angular frequency shifts of the order of several π rad s−1. It is suggested that this mechanism may be at least partially responsible for non-doppler frequency shifts previously reported by the author.


Die frequenzabhängige Rückstreuung akustischer Wellen in der Atmosphäre bewirkt eine Nicht-Doppler-Frequenzverschiebung in der gestreuten Energie eines endlich dauernden akustischen Wellenzuges. Vorübergehende Abweichungen vom Kolmogorov-Turbulenzgesetz über kleine Wellenzahlbereiche werden vorgeschlagen; diese Abweichungen äußern sich in Verschiebungen der akustischen Kreisfrequenz in der Größenordnung von einigen π rad s−1. Es wird vermutet, daß dieser Mechanismus zumindest teilweise für die Nicht-Doppler-Frequenzverschiebung verantwortlich ist, über die der Autor vorher berichtete.


On montre que la rétrodiffusion à dépendance fréquencielle des ondes acoustiques dans l'atmosphère induit un décalage non-dopplérien de la fréquence dans l'énergie diffusée par un train d'ondes de durée finie. On attribue cet effet à des écarts transitoires à la loi de turbulence de Kolmogorov sur le domaine des petits nombres d'ondes. De tels écarts peuvent entraîner des glissements de la fréquence angulaire de l'ordre de plusieurs π rad s−1. On suggère que ce mécanisme pourrait être responsable, au moins partiellement, des glissements non-dopplériens de fréquence rapportés antérieurement par l'auteur.
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Document Type: Research Article

Publication date: 1980-11-01

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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