Patent ID: 7636036

Claim:
A device for the detection of unauthorised liquid or solid substances in a zone with protected access, wherein said device includes the following in combination: a support base ( 100 ) designed to receive a single foot, wearing a shoe, of an individual to be checked, emission/reception means ( 40 ) of an electromagnetic field at least at several frequencies in a specified range of frequencies, position marking means ( 400 ), on the support base ( 100 ), designed to impose a precise positioning of the foot, wearing the shoe, in relation to the emission/reception means ( 40 ), means ( 50 ) for measuring the complex impedance of the emission/reception means ( 40 ) influenced by a load consisting of the shoe and the shoe's contents, representing the complex dielectric characteristics of the shoe and of the shoe's contents, and means ( 50 ) for supplying information associated with the measured complex impedance and therefore with the nature of the contents of said shoe of the individual to be checked.