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On the Relation Between Surface Waves on a Bubble and the Subharmonic Combination-Frequency Emission

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The characterisation of bubbles using a two-frequency excitation technique is known to accurately detect and size certain bubble samples. This is done through the generation of a signal at ωi ± ωp /2 when the bubble is insonified by a fixed MHz imaging signal, ωi , and a variable pumping frequency, ωp , tuned to the bubble's resonance. Recent work has suggested that the principal mechanism for the generation of the ωi ± ωp /2 signal is linked to the onset of surface waves on the bubble's surface. This paper strengthens this argument through the comparison of published experimentally measured thresholds for the ωi ± ωp /2 signal with recent theoretical models which predict the driving sound field pressure amplitudes required for the onset of surface waves on a spherical surface.
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Document Type: Letter Section

Publication date: September 1, 1998

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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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