Analysis of response of the electromagnetic induction for detecting of buried objects

The detection technology for subsurface objects by the microwave method, e.g. synthetic aperture radar (SAR) are increasingly being developing and reported. But these prospecting system have met with some limitations in the aspect of both detection depth and pattern recognition of buried objects (e.g. diameter of a buried object-pipe), and it is difficult to recognize material properties of buried objects. In this paper, the low frequency electromagnetic technique is used. For detection and location of a target-buried object, the analysis of the response of buried object in electromagnetic induction is taken. In an alternating electromagnetic field source, the response characteristic of the electromagnetic induction for the buried targets, which are conducting objects (pipes), are investigated. The principles of the Helmholtz reciprocity is applied to obtain the induction EMF in coils which are placed on the ground surface. Depending on the response characteristics of the object which contains different size and material of the buried metallic pipes. The position and depth of the target-buried object can be detected and located with the help of a microcomputer. The experimental results made in a laboratory are shown