Improved modeling of ultrasonic systems : feasible for industrial applications

Sammanfattning: In this thesis tree aspects of ultrasonic measurement and modelling techniques have been investigated. Namely, transducer diffraction modelling using equivalent circuits, wave propagation in multi phase flow, and wave propagation in gases. The work is relevant both from an scientific point of view and from an engineering point of view. It is of importance in all fields of science and engineering to accurately understand, and create simple and yet physically significant models and methods, of complex systems. The goal with the research have been to create a deeper understanding of complex ultrasonic systems, including transducers and wave propagation. This is a prerequisite when designing and constructing ultrasonic measurement systems.