Simulation Study Of Super-Resolution In Hydrophone Measurements Of Pulsed Ultrasonic Fields

Auteurs-es

  • Wahiba Djerir Research Center in Industrial Technologies (CRTI), BP64, Route de Dely Brahim, Chéraga, Algiers, Algeria. http://orcid.org/0000-0002-1825-0097
  • Tarek Boutkedjirt Faculty of Physics, University of Sciences and Technology Houari Boumédiène, USTHB, BP 32, El-Alia, DZ-16111 Algiers. http://orcid.org/0000-0002-1825-0097

Mots-clés :

super-resolution, spatial inverse filter, spatial Wiener filter, PVDF hydrophone, pulsed ultrasonic field, ultrasonic filed reconstruction

Résumé

In order to carry out reliable measurements of pulsed ultrasonic fields, the use of a piezoelectric hydrophone as receiver is recommended. However, due the finite size of the receiver aperture the measured acoustic pressure is affected by spatial averaging on the surface active face. The aim of this work is to deconvolve the spatial effects of the receiver hydrophone in order to reconstruct the pulsed ultrasonic field with a better spatial resolution. Hereby, the linear pulsed pressure field radiated in water by wideband planar transducers of 19 mm diameter, with central frequencies fc=2.25 MHz and fc=15 MHz are considered. The receivers are PVDF membrane hydrophones of 25 ?m - thickness with rectangular and circular apertures. The results of this study show the strong dependency of the reconstruction quality upon the signal-to-noise ratio (SNR). Generally, the quality of the reconstruction decreases with decreasing SNR. Good reconstruction quality has been obtained with correlation coefficient larger than 0.9936 when the “acquired” signals are not too much noisy (SNR=60dB). In this case, improvement of the spatial resolution by a factor of 5 and 9 respectively could be reached. The reconstruction quality depends also upon the hydrophone dimensions, the axial distance to the source, the central frequency and the spectral frequency bandwidth of the pressure pulse.

Fichiers supplémentaires

Publié-e

2018-11-01

Comment citer

1.
Djerir W, Boutkedjirt T. Simulation Study Of Super-Resolution In Hydrophone Measurements Of Pulsed Ultrasonic Fields. Canadian Acoustics [Internet]. 1 nov. 2018 [cité 11 sept. 2024];46(3):19-28. Disponible à: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/3205

Numéro

Vol. 46 No. 3 (2018)

Rubrique

Article - Acoustique physique / Ultrasons

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