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Increase in performances of focused microacoustic sensors by couplant adjustment*

  • B. Cros (a1), N. Brunet (a1) and J. Attal (a1)

Abstract

The characteristics of the various modes of acoustic waves (velocity, attenuation, efficiency) radiated towards the focused sensor of an acoustic microscope are related to the acoustic properties of the coupling fluid. The aqueous solutions of electrolytes are suitable as coupling fluids because their acoustic properties can be adjusted owing to the choice of the nature and of the concentration of the dissolved ions. By adjusting the properties of the couplant, the performances of the sensors of the acoustic microscopes can be extended. The image contrasts and the accuracy of measurements of the acoustic waves velocity are improved, the radiation of the chosen modes are enhanced and very high frequencies can be used.

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*

This subject was presented at C2I’98 at Cachan the November 18-19, 1998.

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References

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[1] A. Briggs, Acoustic Microscopy (Clarendon, Oxford, 1992).
[2] R.J.M. da Fonseca, L. Ferdj-Allah, G. Despaux, A. Boudour, L. Robert, J. Attal, Scanning acoustic microscopy - Recent Applications in Materials Science, Advanced Materials 7/8, 508 (1993).
[3] T. Kundu, On some aspects of acoustic material signature, Multiple scattering of elastic waves in random media and random rough surfaces, edited by V.K. Varadan, V.V. Varadan (Pub. Kurtz Bros, 1987), pp. 823-843.
[4] Gigot, V., Cros, B., Saurel, J.M., Study of coupling fluid for characterization of high elastic constants, Acta Acustica 65, 346 (1999).
[5] Cros, B., Gigot, V., Despaux, G., Study of the efficiency of coupling fluids for acoustic microscopy, Appl. Surf. Sci. 119, 242 (1997).
[6] K.G. Breitschwerdt, H. Kistenmacher, J. Chem. Phys. 56 4800 (1972).
[7] Brunet, N., Cros, B., Saurel, J.M., Etude de l'efficacité des modes de Lamb dans la signature acoustique en fonction du liquide de couplage, Eur. Phys. J. Appl. Phys. 2, 209 (1998).

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Increase in performances of focused microacoustic sensors by couplant adjustment*

  • B. Cros (a1), N. Brunet (a1) and J. Attal (a1)

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