The electric power generation and oil/gas production industries have a strong interest in the
physical characterization of conducting and non-conducting liquid films that are formed
during the flow of liquids in pipes. Conducting and non-conducting liquid films do not lend
themselves to the same characterization techniques due to the different requirements
originating from their electrical properties. Techniques based on the use of ultrasound are
extremely attractive for that purpose as they do not depend on the electrical properties of the …