Dr. Nadir Maghlaoui, Associate Professor, Higher School of Applied Sciences, Algiers, University of Sciences and Technology Houari Boumediene, Algiers, Algeria

Biography: Dr. Nadir MAGHLAOUI is an Associate Professor at Higher School of Applied Sciences, Algiers, University of Sciences and Technology Houari Boumediene, Algiers, Algeria. He obtained his Doctorat in Physics at University of Sciences and Technology Houari Boumediene, Algiers, Algeria and at University of Valenciennes, France. His doctoral research work was focused on the Ultrasonic Non Destructive Testing and the Acoustic Microscopy modeling. Currently he conducted a scientific stay at the Institute of Electronic Microelectronic and Nanotechnology of Valenciennes in France.

Research Interest: Ultrasonic Non Destructive Testing, Numerical Simulation of the reflection of the ultrasonic wave at liquid solid interface, modelling of the ultrasounds waves propagation in solid polymer.

Speech Title: Numerical Study of the Reflection at a Liquid Solid Interface of a Transient Ultrasonic Field Radiated by a Linear Phased Array Transducer

Abstract: We have used a model for the study of the transient ultrasonic waves radiated by a linear phased array transducer in a liquid then reflected at a liquid solid interface. This model is based on the Rayleigh integral where the reflection at the plane interface is taken into account by using the reflection coefficients for harmonic plane waves. The transient field is obtained by an inverse Fourier transform of the harmonic results.

The results obtained highlighted the different components of the ultrasonic field : the direct and edge waves as well as the longitudinal head waves or leaky Rayleigh waves. The transient representation of these waves have been analysed and discussed by the rays model. Instantaneous cartographies allowed a clear description of all the waves which appear at the liquid-solid interface.

The obtained results have been compared to those obtained by using a finite element method package.