| Issue |
Eur. Phys. J. AP
Volume 9, Number 1, January 2000
|
|
|---|---|---|
| Page(s) | 81 - 85 | |
| DOI | https://doi.org/10.1051/epjap:2000204 | |
| Published online | 15 January 2000 | |
https://doi.org/10.1051/epjap:2000204
Increase in performances of focused microacoustic sensors by couplant adjustment*
LAIN, Université Montpellier 2, 34095 Montpellier Cedex 05, France
Corresponding author: cros@lain.univ-montp2.fr
Received:
9
February
1999
Revised:
25
August
1999
Accepted:
20
September
1999
Published online: 15 January 2000
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.
PACS: 81.70.Cv – Non destructive testing: ultrasonic testing, photoacoustic testing / 62.60.+v – Acoustical properties of liquids / 68.60.Bs – Mechanical and acoustical properties
© EDP Sciences, 2000
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