Patent ID: 7898384

Claim:
A system for checking a single crossing of a controlled passage, comprising: an intercepting booth ( 1 ); a first unit ( 2 ) for detecting a variation over time (t) of the weight (P) of one or more people ( 7 ) and/or things in a controlled passage ( 6 ) delimited by the intercepting booth ( 1 ); a second unit ( 3 ) for detecting a variation over time (t) of a capacitance (C) of an electrical capacitor, the electrical capacitor comprising two metal armours, the controlled passage ( 6 ) being located between the two metal armours; and an electronic programmed unit ( 8 ) with i) inputs ( 9 ) connected to at least the first unit ( 2 ) and the second unit ( 3 ), and ii) outputs ( 10 ) connected at least to an alarm unit ( 11 ) and to a device for controlling at least an opening and closing of a door ( 13 ) separating the controlled passage ( 6 ) from a protected area ( 14 ), wherein the electronic programmed unit is configured to compare a shape and amplitude of a first signal received from the first unit with a shape and amplitude of a second signal received from the second unit and, based upon the comparison, determine whether more than one person and/or thing has entered the intercepting booth ( 1 ) and, upon a positive determination that more than one person and/or thing has entered the intercepting booth ( 1 ), activate the alarm unit ( 11 ) and prevent an opening of the door ( 13 ).