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Practical Systems for the Generation of High Power Continuous Wave-Non Focused Ultrasound in the MHz Range

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Two types of ultrasonic transducers which allow to generate high intensity fields on large surfaces have been developed for operation at MHz frequencies in continuous waves. These transducers, based on low-loss piezoceramics, have efficiencies ranging from 75% to 97%. Their efficiency as well as their electrical input impedance were predicted either by a model based on the KLM equivalent circuit in which losses have been included, or by approximate formulas we have derived. These transducers were operated continuously at 30 W/cm2 during more than 50 hours without significant change in their behaviour. Such devices designed for investigations of biological and chemical effects, are expected to find industrial applications in fields such as sonochemistry, medical therapy and biotechnology.

Document Type: Short Communication

Publication date: November 1, 1997

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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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