Institut Dr. Friedrich Foerster Pruefgeraetebau Gmbh & Co. Kg

Friedrich Martin Foerster

A method for locating and identifying search objects concealed in the gro under a ground surface is described. Preferred search objects are plastic mines, which inter alia contain a plastic body and at least one metallic part, particularly an igniter. Firstly the position of the metallic part is established, preferably with an eddy current probe. Then a search area surrounding the part is investigated by means of a ground probe, which produces a ground signal indicating the presence of ground material. The ground signal is evaluated in position discriminating manner. Preferably the ground probe and metal probe are identical, which is e.g. made possible by an operation of the eddy current probe with at least three different frequencies and a suitable signal evaluation. Prior to the investigation of the search area the electrical conductivity and/or magnetizability of the ground can be increased by impregnating with a liquid, which can contain salt water and/or magnetizable particles. A portable mine searching device is also described, in which at the lower end of a supporting rod is located a probe carrier casing, within which the eddy current search coil system is guided in reciprocating manner.

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Pfullingen, Germany

Friedrich Martin Foerster