Apparatus and method for detecting metallic objects in shoes
AssigneeMorpho Detection, Inc.
InventorChristopher Crowley
Life of this patent
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Abstract
An inspection system positions a balancing shim to asymmetrically balance a magnetic field generated by an inductive sensor, which forms part of the inspection system. Additionally, relays and capacitors used to tune the inductive sensor to a desired resonance frequency are geometrically arranged to minimize electrical interference generated by operation of the relays and capacitors. A shielding device, which may be formed on a printed circuit board, protects a magnetic field generated by the inductive sensor from external electromagnetic interference. A slot positioned in the inductive sensor may be used to tune a resonant mode of the inductive sensor to accurately and particularly detect metallic shanks and/or other metallic objects in shoes, socks, and/or clothing.
Claims5
-12. (canceled)
A method, comprising:
- detecting a presence of an item within a scanning area of a shoe scanner, wherein the shoe scanner includes means for detecting a shoe shank;
- exciting one or more metal detector conductive traces with electromagnetic signals at a pre-determined resonance frequency that corresponds to a characteristic resonance frequency of a pre-determined alarm object;
- and
- generating a magnetic field in response to the electromagnetic signals.
Dependencies are inferred from the claim text.