Electrical and Optical Measures of the Ultrasonic Reflection on Liquid-Solid Interface

The experimental study of the reflection of ultrasonic waves (F = 5 MHz) at a liquid-solid interface shows near the Rayleigh angle a minimum level which is not explained by calculation. Many theories have been put forward to explain this effect. In this paper we attempt to define the problem by studying the fine structure and the variation of the reflected bounded beam for frequencies between 4.5 MHz and 7.1 MHz. We notice both a variation in the size of the beam and a dissymmetrical distribution of the ultrasonic pressure inside it.