Method and apparatus for detection of targets in an...

Details Method and apparatus for detection of targets in an... Method and apparatus for detection of targets in an...

G - Physics

08

B

340/124.3

G08B 13/24 (2006.01)

Patent

CA 1229141

ABSTRACT OF THE DISCLOSURE Targets of readily saturable magnetic material and mounted on protected articles are detected when taken through an interrogation zone in which an alternating magnetic interrogation field is generated by transmitter antenna coils. The target is driven alternately into and out of saturation and it disturbs the alternating magnetic interrogation field in a manner so as to produce alternating magnetic fields at frequencies which are harmonics of the frequency of the alternating magnetic interrogation field. The composite of these alternating magnetic fields has a characteristic asymmetry due to the effect of the earth's magnetic field. The target responses are detected by receiver antenna coils to produce first detection signals which are processed in a compressor and a signal average to produce asymmetry signals which are compared in a comparator with the first detection signals to produce alarm signals.

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