Joshi, Deepa and Bhatnager, Deepa and Kumar, Ashok and Gupta, Reeta (2009) Direct measurement of acoustic impedance in liquids by a new pulse echo technique. MAPAN - Journal of Metrology Society of India, 24 (4). pp. 215-224. ISSN 0974-9853

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Abstract

For the first time a novel experimental technique has been used for direct evaluation of acoustic impedance of liquids. Till date researchers have been using ultrasonic velocity and density measurements to compute acoustic impedance and thermodynamic parameters, which are then used to investigate the nature of molecular interactions of solvent molecules in binary, ternary and quaternary liquid mixtures. Evaluation of acoustic impedance directly is a step in minimizing the cumbersome process of measuring velocities and densities separately of solutions having different mole fraction concentration. Acoustic impedances of ten pure polar and non polar solvents have been determined at different temperatures of 298K, 303K and 308K. This is further coupled with inline simultaneous determination of ultrasonic velocities of the solvents. In order to establish the new method, results have been discussed by comparing the calculated ultrasonic velocity from the experimental acoustic impedance, ultrasonic velocity determination by delay time of flight and the literature values of ultrasonic velocity of the pure solvents.

Item Type:	Article
Additional Information:	Copyright for this article belongs to Springer Science+Business Media.
Subjects:	Instruments/ Instrumentation Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	22 Aug 2012 11:30
Last Modified:	22 Aug 2012 11:30
URI:	http://npl.csircentral.net/id/eprint/453

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