Walk-through metal detector

Details Walk-through metal detector Walk-through metal detector

G - Physics

01

N

340/124.3

G01N 27/72 (2006.01) G01V 3/10 (2006.01) G01V 13/00 (2006.01)

Patent

CA 1306033

ABSTRACT OF THE DISCLOSURE A pulsed-field walk-through metal detector contains circuitry to reduce several different types of external noise, or interference due to external stationary or moving metal, and signals due to small objects, such as jewelry. A self-test fixture monitors system performance. The detector has digitally controlled timing means operating at an odd half-multiple of the power mains frequency. A gated integrator is active for periods equal to a multiple of the TV retrace frequency. A switched- capacitor FIR filter removes signals due to steady power line hum, and a subtractive means removes signals due to stationary metal, prior to averaging or lowpass filtering. A peak limiter controls transient noise bursts. A voting circuit reduces the likelihood of false alarm triggering. A simple self-test circuit, consisting of a wire loop and a switch, tests the entire signal path and has no moving parts.

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