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Theoretical and experimental study of the diffraction of focused ultrasonic waves in viscous fluids

type de publication      communication internationale avec actes publiés
date de publication 2003
auteur(s) Djelouah Hakim; Bouaoua Noureddine; Alia Ahlem; Khelladi Hassina; Belgroune Djemaa
  
conférence World Congress on Ultrasonics 2003
     dates de 07-09-2003 à 10-09-2003
     lieu Paris
     nom des actes Proceedings of the WCU 2003 Conference
  
pages 1347 – 1350
ISBN / ISSN 2-9521105-0-6
résumé The acoustic pressure emitted in a viscous fluid by a focused transducer of circular aperture, is calculated by using the impulse response method and the obtained waveforms are interpreted in terms of direct and edge waves. These results are extended to the case of the diffraction of focused transient ultrasonic waves by a small target immersed in a viscous fluid. A discussion will relate the influence of various parameters (frequency, position, aperture and focal distance, attenuation, ..) on the waveform of the detected ultrasonic pulses. The conclusions of this study have been used to interpret the pulses obtained in an experimental study of the diffraction of focused transient ultrasonic waves by a small target immersed in a viscous fluid (glycerin).
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