초록 ▼

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 receiv

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.

대표청구항 ▼

[ I claim:] [1.] A detector system for access control, the system comprising:transmitter coils;associated receiver coils;transponders suitable for generating identifiable signatures; andprocessor circuits adapted firstly to detect a weapon passing between the transmitter and receiver coils by analyz

[ I claim:] [1.] A detector system for access control, the system comprising:transmitter coils;associated receiver coils;transponders suitable for generating identifiable signatures; andprocessor 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; andthe signals used for detecting transponders are taken from the outputs of receiver coils that are also used for detecting weapons.