The Geophysical Exploration System EMFAD UG 12
Introduction With this documentation we are presenting the UG 12 System, developed by EMFAD® GmbH, for measuring abnormal changes of conductivity in the ground. The anomalies which can be measured by the UG 12 method are mainly caused by: conductive metal materials, like pipes, cables, barrels, metal waste, reinforced concrete etc., irregularities in the subsoil, caused by cavities, graves, faults, shafts, groundfills, deposits, electrolytic effluents from landfills etc.
Questions & Answers In order to be able to give as many answers as possible to questions of potential users in this various ® fields of application, we have ased Dipl.-Geophysiker Rüdiger Brede, Technical Director at EMFAD GmbH. DTI: Please explain to us the measuring method of the UG 12 system in simple words. R. B.: The method developed by us of detecting field anomalies can recognise abnormal "unusual" changes in earth by measuring the conductivity of the ground.
DTI: How are the measurements carried out? R. B.: Firstly, the search task should be clearly defined, then the landscape is to be examined and it is to be determined at which time the area can be searched. Of course, the user of the unit will have made previously many test measurements in order to become acquainted with the working method and, in particular, with the display evaluation of the measurements made.
R. B.: When this involves small areas of a few square metres it does not matter, only with large reinforced concrete surfaces one must expect supression, i. e. attenuation of the measurd values so that possibly no measurement of anomalies is possible below these surfaces. DTI: What do the different colours mean in the graphs of the search areas recordet? R. B.
After measuring, the stored data on the UG 12 must be transferd to a laptop, a notebook or a PC at home. In the computer the data is prepared by a special software und shown as a graphic on the screen. This photo shows how the operator walks from starting point S1 to the end of the search area and then moves on 2 meters to point S2 and continous back on line 2 in order to take the second measurement. The complete search area is being examined using this 'rectagle' method.
