DETECTOR OF METALLIFEROUS OBJECTS

A detector of metalliferous objects comprises a first driving loop generating an original electromagnetic field. First, second, third and fourth receiving loops receive the secondary electromagnetic field of a meetal liferous object and rigidly fitted to the driving loop, with the first and second, third and fourth receiving loops mounted in pairs coaxially and parallel to one another. The driving loop is located in the plane of the common axes of the first and second, third and fourth receiving loops symmetrical and orthogonal. An alternating voltage generator has an output electrically coupled to the first driving loop. A first signal balancer balances the signals from the first and second receiving loops, having inputs connected to the first and second receiving loops, and an output. A second signal balancer balances signals from the third and fourth receiving loops, having inputs connected to third and fourth receiving loops, and an output.