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Leif Wolf

Applying a Multi-Segmented Geoelectrical Probe for Leak Detection in Sewer Systems

Within the interdisciplinary project SAM (Sewer Assessment with Multi-sensor Systems) also geoelectrical methods have been tested for their ability to integrate them into the envisaged multi-sensor system. The physical principle is the measurement of the electrical field around a probe which is pulled through a water filled sewer. Cracks and other defects filled with wastewater have significantly lower electrical resistivities compared to an undamaged pipe. This results in anomalies in the electric field which are measured with the probe. While one geoelectrical probe was newly developed in the prototype stadium, most measurements were conducted with a pre-existing geoelectrical probe (AMS4-S50R by Seba Dynatronic) at different project test sites in the lab and in the field. The measurements showed good correlation with the known defects at the test sites. Summing up it can be stated that the AMS4-sonde provides a signal which corresponds to the size of the leak and which is well suited for the sensor fusion project of the research group.

tm – Technisches Messen, Oldenbourg Wissenschaftsverlag

Print ISSN: 0171-8096
Volume: 70, 07/2003
Pages: 346

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