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A New and Simple Method of Solid Polymeric Acoustic Characterisation by Means of the Electrical Impedance Modulus

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We purpose, in this paper, a simple and original method to determine the velocity and absorption coefficient of compressional acoustic waves propagated in isotropic solid materials. It is based on electric impedance measurements in a frequency bandwidth around the transducer resonance frequency. The impedance measurements, in the same frequency bandwidth, of a transducer unloaded and loaded by the sample permit the determination of electric impedance of acoustic line, constituted by the load. Its modulus processing gives the material acoustic properties. We first develop a theoretical part to determine the absorption coefficient and velocity expressions from the impedance modulus extremes. Then, we apply this method to characterize some materials (PMMA, Polysulfone, PVC, and Ertacetal). We can also determine the transducer electromechanical transformer ratio.
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Document Type: Research Article

Publication date: September 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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