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Study of Coupling Fluids for the Microacoustic Characterization of High Velocity Materials

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Mechanical characterization of materials using acoustic microscopy requires acquisition of acoustic signatures. These signatures or V(z) are not only characteristic of the investigated materials but are also influenced by the use of appropriate coupling fluids. The aim of this work is to demonstrate the modifications of the acoustic signatures recorded at 570 MHz and the deduced FFT curves versus the concentration of a series of coupling liquids. These liquids, chosen according to their acoustic properties, are aqueous solutions of potassium hydroxide KOH. Acoustic microechography and acoustic microscopy were used to determine absorption and velocity of these electrolyte solutions as a function of their concentration in a large range (0–19 M). The theoretical approach of the electrolyte/sample system enlightens on the part of the density of the coupling fluid. The experimental study was carried out on three materials chosen according to their acoustic waves velocities: steel, glass and silicon. The peaks appearing in the curves deduced by FFT treatment from the experimental acoustic signatures are assigned by comparison with theoretical models. The longitudinal mode velocity of steel and the Rayleigh mode velocity of silicon which lie in the range 5500–7500 m/s can be measured using high concentrated solutions. The evolution of the shape of the curves as a function of the solutions concentration confirms that the increase in density of the coupling fluids improves the radiation of the surface waves in the liquid.
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Document Type: Research Article

Publication date: May 1, 1999

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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