Generation and detection of ultrasonic waves with no contact by electromagnetic way

This work is not only to study and analyse the electromagnetic generation and detection of ultrasonic waves, but to investigate their possible application in nondestructive testing of materials as well. The theory has been based upon the analysis of two magnetic effects. These are namely: the magnetostrictive effect and the electrodynamic effect. The analysis of the latter effect has been founded upon a macroscopic and a microscopic model. For each model, the propagation equation of the electromagnetically produced acoustic waves has been established and resolved. In the microscopic model, two cases have been considered: generation with static induction superposition. Generation without static induction superposition. As regards detection, only the generation with static induction superposition has been considered. Longitudinal and transverse waves have been experimentally generated and detected in steel, aluminium, and copper. The following parameters have been analysed: The static induction effect. The nature propagation medium. The effect of the distance between the generating coil and for receiving one and the material surface. The effect of coil characteristics. Finally, the possibility of generating and detecting ultrasonic waves has been analysed using a single coil in a combined emission - reception mode