Patent ID: 9664809
Date: 2017-05-30
CPC Classifications: G01V

Claim:
1. A metal detector comprising: a stem or shaft having a proximal end and a distal end, said shaft distal end carrying a distal detector or search head having a first, peripheral coil mounted on a base; a power supply for energizing said peripheral coil to produce a detecting magnetic field; multiple sensor coils mounted on said base in an array within and substantially coplanar with said peripheral coil for sensing perturbations in the magnetic field due to a target and producing corresponding output signals; receivers detecting said output signals; a display unit having a display screen; a scanner for transferring said output signals to said display screen to produce images of said target; wherein said scanner generates signals to generate a display of relative location for a target object which is beneath said search head; and wherein said sensor coils are arranged in a first, second third and fourth sectors, and further including: a first sector coil surrounding and substantially coplanar with a selected plurality of first sector sensor coils, wherein said first sector coil and said first sector sensor coils are located within a selected first quadrant within said peripheral coil, wherein said first sector coil is energizable to produce a first quadrant or corresponding first sector magnetic field which is detectable by said first sector sensor coils and wherein said first sector coil is connectable to detect perturbations in magnetic fields produced by said peripheral coil and to produce corresponding first sector output signals.