Prof. Dr.-Ing. Werner Henkel
04/07/2003 – 05/07/2003
Presently, all kinds of cable connections into and inside the house are used for data transmission. Telphone wires, e.g., support xDSL data connections of up to 14.5 MBit/s. Power-line communications have been considered to be a possible alternative to xDSL technologies. However, powerline is not suited for high transmission rates due to the asymmetrical operation and the corresponding electromagnetic compatibility issues. Nevertheless, power-line communication is already in use for low-rate services, e.g., for meter reading. Water pipes may offer further possibilities for data transmission. Also heating pipes, reaching almost every room, may be usable for communication purposes. Communication over tubes will to a high extent actually be transmission over solid wave guides.
As part of this project, characteristics of sonar channels should be studied. Especially water and heating pipes, and even oil pipelines should be considered in this examination. Network aspects should also be created in addition to characteristics that are due to the pipe construction itself. Transfer characteristics and disturbances should be obtained. The transmission characteristics will be determined by the properties of the acoustic hollow/solid waveguide. Additional effects are caused by acoustic bridged taps, which can be “open” or “shorted”. The doppler, caused by the movement of the fluid, will also play an important role. The doppler shift should be estimated. What types of disturbances have to be expected? There will at least be noise due to the streaming, running pumps, and impulse noise caused by valves, switched pumps, and external mechanical influences. The work will be based on literature studies and own considerations. As a preparation for further studies, suitable electro-acoustical converters should be selected.
The study may also give first hints for suitable transmission methods. It should be found out, which procedures have already been applied. Comparing implementations and results with acoustical free-space transmission may give some further insights.