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Electromagnetic Methods

Electromagnetic methods have been used for the location of underground metallic pipes since the start of this century, and they are now widely used for the detection of buried pipes and cables. The principle of the method is that an alternating current (AC) is applied to a metallic pipe, thus inducing a magnetic field which can then be detected by magnetic sensors positioned on the ground surface. From the analysis of the received signal the location and the depth of the target is estimated. EM methods are also used to assess the condition of metallic and steel reinforced pipes.

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