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Ultrasound Radiation from Simple Thermoacoustic Transducers

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Thermoacoustic equations are derived to describe the sound pressure radiation by a heated plane over a material substrate. By determining the velocity of an equivalent piston, the sound pressure emitted by a thermoacoustic source of finite dimensions can be calculated at any frequency. The measured sound pressures, obtained with devices constructed ad hoc for the experiments, are in good agreement with the theoretical expectations in the audio and ultrasound region, from 500 Hz to at least 100 kHz. The main results show that it is possible to produce significant sound pressure radiation in this frequency bandwidth with very simple devices, constructed with common materials. A potential feature for the kind of sound source described in this paper is that their radiating surfaces can have a desired shape, not only a plane one.
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Document Type: Research Article

Publication date: March 1, 2004

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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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