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Wärmeproduktion in Festkörpern durch Ultraschallabsorption als Grundlage für ortsauflösende Ultraschalleistungssensoren

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Ultrasonic absorption in solids leads to a temperature increase which is proportional to the absorbed acoustic power. A sensor of ultrasonic power is developed by utilization of the thermoacoustic properties of solids. The sensor works in the lower MHz range with an optimum spatial resolution of about 2 mm. An excellent agreement of the sensitivity and the resolution with theoretical calculations is shown.

Zusammenfassung

Die durch Schallabsorption in Festkörpern resultierende Temperaturerhöhung ist der eingestrahlten Ultraschalleistung linear proportional. Unter Ausnutzung dieses thermoakustischen Effekts wird ein robuster und einfach zu handhabender Schalleistungssensor realisiert, der im unteren MHz-Bereich arbeitet und eine Ortsauflösung im mm-Bereich besitzt. Die experimentell ermittelte Ortsauflösung des Meßverfahrens zeigt eine hervorragende Übereinstimmung mit einem theoretischen Simulationsmodell.

Sommaire

L'absorption ultrasonique dans un solide produit une augmentation de la température dépendant de l' énergie acoustique. On a développé un capteur pour la détermination de l'énergie ultrasonique à partir de l'effet thermoacoustique d'un solide. Le capteur est utilizable jusqu' à 8 MHz etatteint une résolution spatiale de 2 mm. On présente ici une discussion des divers aspects aussi bien théoriques qu'expérimentaux de la métrologie thermoacoustique.
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Document Type: Research Article

Publication date: 01 May 1994

More about this publication?
  • 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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