Method and apparatus for detecting metal objects

Details Method and apparatus for detecting metal objects Method and apparatus for detecting metal objects

G - Physics

01

V

340/124.3

G01V 3/08 (2006.01) G01V 3/10 (2006.01)

Patent

CA 1279387

(57) ABSTRACT The invention relates to a method and an apparatus for detecting metal objects in a metal detecting apparatus using impulse techniques. The metal detector comprises a compensation circuit arranged in between the transmitter system (13) and the receiver system 114) in order to compensate the mutual inductance between the transmitter (11) and the receiver (12). The compensation circuit is advantageously operated so that the signal caused by the matal object in this detector is measur- able during both at least two measuring sequences (21,22) located within the range of the cut-off peak of the transmitter current and during at least one measuring sequence (23) located outside the range of the cut-off peak of the transmitter current.

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