L.Ait Ali

Publications (1)0 Total impact

• Article: Avantages du second harmonique généré par non linéarités ultrasonores en reconstruction d'images tomographiques par diffraction

  L.Ait Ali, D Kourtiche, A.V Detti, A Chitnalah, M Nadi
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  ABSTRACT: This article presents a theoretical and experimental study on the use of second harmonic in tomographic images reconstruction. A theoretical study based on KZK equation shows the different properties of the second harmonic ultrasonic beam. An algorithm using finite differences method allows to simulate the acoustic field taking into account diffraction, non-linearity and absorption phenomena. The experimental device uses a piezoelectric disc of 2 cm diameter emitting to 3 MHz. For the reception, a wideband hydrophone permit to measure the transmitted field. For tomographic images reconstruction, one measures the diffracted field by a cylindrical object of 2 cm diameter. An image reconstruction program based on Fourier diffraction theorem gives slice images of the examined object
  ITBM-RBM.