Dector system for access control, and a detector assembly for implementing such a system
First Claim
1. A detector system for access control, the system comprising:
- transmitter coils;
associated receiver coils;
transponders suitable for generating identifiable signatures; and
processor circuits adapted firstly to detect a weapon passing between the transmitter and receiver coils by analyzing variations in the signal received by the receiver coil, and secondly to detect the identifiable signature of a transponder on the basis of the signal received by the receiver coils;
wherein;
the transmitter coils are adapted to generate respective frequencies, firstly for exciting and detecting any weapons passing between the transmitter and receiver coils, and secondly for activating transponders;
the transponders have means suitable for powering their internal circuits electrically from the signal received at the "activation" frequency;
each weapon excitation and detection frequency is very different from each frequency used for activating transponders and for transponder signatures; and
the signals used for detecting transponders are taken from the outputs of receiver coils that are also used for detecting weapons.
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Abstract
The present invention provides a detector system for access control, the system comprising: transmitter coils; associated receiver coils; transponders suitable for generating identifiable signatures; and processor circuits adapted firstly to detect a weapon passing between the transmitter and receiver coils by analyzing variations in the signal received by the receiver coil, and secondly to detect the identifiable signature of a transponder on the basis of the signal received by the receiver coils; wherein: the transmitter coils are adapted to generate respective frequencies, firstly for exciting and detecting any weapons passing between the transmitter and receiver coils, and secondly for activating transponders; the transponders have means suitable for powering their internal circuits electrically from the signal received at the "activation" frequency; each weapon excitation and detection frequency is very different from each frequency used for activating transponders and for transponder signatures; and the signals used for detecting transponders are taken from the outputs of receiver coils that are also used for detecting weapons.
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Citations
21 Claims
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1. A detector system for access control, the system comprising:
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transmitter coils; associated receiver coils; transponders suitable for generating identifiable signatures; and processor circuits adapted firstly to detect a weapon passing between the transmitter and receiver coils by analyzing variations in the signal received by the receiver coil, and secondly to detect the identifiable signature of a transponder on the basis of the signal received by the receiver coils; wherein; the transmitter coils are adapted to generate respective frequencies, firstly for exciting and detecting any weapons passing between the transmitter and receiver coils, and secondly for activating transponders; the transponders have means suitable for powering their internal circuits electrically from the signal received at the "activation" frequency; each weapon excitation and detection frequency is very different from each frequency used for activating transponders and for transponder signatures; and the signals used for detecting transponders are taken from the outputs of receiver coils that are also used for detecting weapons. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification