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Calibration of Ultrasonic Fields Using Optical Holography

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Ultrasonic intensity measurements are carried out by evaluating the surface relief produced by the radiation pressure of a propagating sound wave striking the free liquid surface. The measuring method is based on optical holography. The surface profile is quantitatively determined by doubleexposure holography, whereas the surface tension effect is taken into consideration by means of shadow optical investigations of single-exposed holograms. The method used enables the absolute calibration of arbitrarily shaped sound fields.

Zusammenfassung

Messungen der Ultraschallintensität werden durchgeführt, indem das von einer fortschreitenden Ultraschallwelle an der freien Flüssigkeitsoberfläche erzeugte Oberflächenrelief ausgewertet wird. Die Meßmethode basiert auf der optischen Holographie. Das Oberflächenprofil wird quantitativ bestimmt durch Doppelbelichtungsholographie; hingegen wird der Effekt der Oberflächenspannung durch schattenoptische Untersuchung einfachbelichteter Hologramme berücksichtigt. Die angewandte Methode ermöglicht die Absolutkalibrierung von Schallfeldern beliebiger Form.

Sommaire

L'intensité des ultrasons peut se mesurer en évaluant le relief de surface que produit la pression de radiation quand une onde sonore progressive frappe la surface libre d'un liquide. La méthode de mesure se base sur l'holographie optique. Le profil de la surface liquide se détermine quantitativement par holographie à double exposition, tandis que l'effet de tension superficielle est prise en considération grâce à des mesures d'ombres optiques sur des hologrammes à simple exposition Cette méthode permet la calibration absolue des champs ultrasonores de configuration quelconque.
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Document Type: Research Article

Publication date: October 1, 1980

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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