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Ultrasonic couplants for acoustic microscopy of low speed materials

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3 Author(s)
Ardebili, V.S. ; Dept. of Mech. Eng., Toronto Univ., Ont., Canada ; Sinclair, A.N. ; Spelt, J.K.

A method is presented for estimating the compression wave velocities of organic fluids, based only on their density and molecular properties. The method is applied to a search for very low-speed ultrasonic couplants, suitable for 250 MHz acoustic microscopy studies of epoxy materials. Experimental measurements confirmed that acoustic velocity could be predicted within 3% for simple fluorine-containing organic compounds, and within 10% for those with a more complex molecular structure. The compound 2-dichloropentafluoropropane (C/sub 3/HCl/sub 2/F/sub 5/), with a compression wave velocity of C/sub L/=638 m/s and acceptably low attenuation coefficient, was identified as a good coupling agent for acoustic microscopy studies of low speed materials.

Published in:

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:44 ,  Issue: 1 )