Analysis of the wave propagation in the electroacoustic channel ofultrasonic clamp-on flow meters

Abstract

A wave propagation in the electroacoustic channel is investigated when the incident angle of the ultrasonic beam is less then the first critical angle. In this case there are two ultrasonic waves in the metallic pipe wall: longitudinal and shear. These waves transform in to two longitudinal waves in the flow liquid with a time delay. The axis of the ultrasonic beam is shifted along the pipe. In this case the acoustic preassure in the liquid may be increase or decrease. It depends on the wall thickness, the ultrasonic signal frequency and the incident angle.