Symmetric multiple sensing apparatus
First Claim
1. A metal detector for control of protected access zone comprising two oblong shape vertical housings, and emitting and receiving electrical coils provided in said housings, wherein at least a X/Gamma sensor is provided in at least one of said housings, said coils and X/Gamma sensor being provided symmetrically in regard to said coils in said at least one of said housings so as to present physical and geometrical coincidence detections and wherein said emitting and receiving coils are associated with control means adapted to detect a lead component, said metal detector further comprising a control unit which automatically increases the sensitivity of the X/Gamma sensor when said control means detects the presence of a lead component.
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Abstract
An apparatus for metal detection is provided. The metal detector is used to provide protected access to sensitive areas. The metal detector includes two oblong shape vertical housings and emitting and receiving electrical coils which are provided in the housings. Further, at least one additional type of sensor is provided in at least one of the housings. The coils and additional sensors are symmetrically provided in at least one of the housings so as to present physical and geometrical coincidence detection.
26 Citations
34 Claims
- 1. A metal detector for control of protected access zone comprising two oblong shape vertical housings, and emitting and receiving electrical coils provided in said housings, wherein at least a X/Gamma sensor is provided in at least one of said housings, said coils and X/Gamma sensor being provided symmetrically in regard to said coils in said at least one of said housings so as to present physical and geometrical coincidence detections and wherein said emitting and receiving coils are associated with control means adapted to detect a lead component, said metal detector further comprising a control unit which automatically increases the sensitivity of the X/Gamma sensor when said control means detects the presence of a lead component.
Specification