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Characterization with Acoustical Compression Waves of Isotropic Materials by Means of Electrical Impedance Measurements Caractérisation, en ondes acoustiques de compression, de matériaux isotropes par impédancemétrie électrique

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The equivalent electric circuit of a transducer around its resonance applied to two extreme cases allows to precise the ideal transducer characteristics useful to our measurements.After, we propose three methods to characterize isotropic material acoustically (velocity and attenuation of compression waves) using the admittance measurement of the transducer loaded with the studied material. The first one, only for liquid, demands measurements at a fixed frequency and with a variable liquid height. The second one, for liquids and solids needs measurements at three frequencies. These two methods are adapted to small thickness samples. They suppose the transducer characteristic invariability vs. the load (Hypothesis H). The third one, qualified as " is adapted to the large thickness samples; the motionnal branch must be equivalent to a series resonant circuit in the measurement frequency band (Hypothesis H). The velocity and the attenuation are obtained as well the transducer characteristics.Each method is studied by means of a realistic simulation which establishes the process, the solution singleness and the restitution quality of the sizes to be measured.At last, every method is exploited with some various and adapted samples (silicon oil, PVC, plexiglas, and polysulfone); moreover, the H and H hypothesis validity is verified.

French
Le schéma équivalent d'un transducteur autour de sa résonance étudié pour deux cas extrêmes permet de préciser les caractéristiques idéales de transducteur pour nos mesures à savoir C0 , r, l et c.

Puis nour présentons trois méthodes de caractérisation acoustique de matériaux isotropes (célérité et atténuation des ondes de compression) utilisant la mesure de l'admittance du transducteur chargé par le matériau étudié. La première, adaptée aux liquides réclame des mesures à fréquences fixes et à hauteur de liquide variable; la seconde, convenant aux liquides et aux solides, nécessite des mesures à trois fréquences. Ces deux méthodes conviennent à des échantillons de faibles épaisseur; elles postulent l'indépendance des caractéristiques du transducteur avec la charge (hypothèse H1). La troisième dite de résonance réclame des échantillons longs et la possibilité de modéliser la branche motionnelle par un circuit rlc (hypothèse H2). Elle fournit la célérité et l'atténuation ainsi que les caractéristiques du transducteur.

Chaque méthode est étudiée par une simulation réaliste qui permet d'établir la procédure, l'unicité de solution et la qualité de la restitution des grandeurs à mesurer.

Enfin, chaque méthode est exploitée avec des échantillons adaptés et variés (huile silicone, P. V. C. plexiglas et polysulfone); la validité des hypothèses (H1) et (H2) est aussi contrôlée.
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Language: French

Document Type: Research Article

Publication date: September 1, 1997

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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