PRACTICAL ASPECTS OF MODAL PROPAGATION THROUGH WATER-FILLED PIPES

The use of ultrasound for sensing and communication is growing. Many m easurement applications (such as how metering and level sensing) invol ve the use of guided acoustic energy, for example constrained within a liquid filled pipe. This paper discusses the problem of axisymmetric sound propagation in pipes, with particular reference to ultrasound, a nd extends the theory to allow prediction of the amplitudes of propaga ting modes for a given source, receiver and pipe geometry. An experime ntal confirmation of the theory has also been obtained and is describe d.