Development of a compact apparatus for determining complex parameters of fluid-filled porous solids by impedance techniques.
Grant, Steven D.
Baker, Steven R.
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A method for determining the complex bulk modulus ᷉B and the complex mass density ᷉p of a fluid contained in a rigid porous solid is investigated. The fluid filled solid is contained within a small cylindrical cavity capped on each end by identical transducers. This method, suitable for an acoustically "soft" transducer, is based upon electroacoustic network theory. ᷉B and ᷉p are obtained from the input electrical impedance of each transducer when they are wired in parallel "in-phase" and "out-of-phase", respectively. A description of the apparatus and preliminary experimental results are presented.
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