| 摘要 |
<p>A gun detection system comprising a detection gate having first and second panels arranged opposite to each other for defining a sensing space therebetween, the first and second panels detecting scattered electromagnetic fields and generating first and second sense signals having a phase difference therebetween in accordance with the detected results, respectively, an oscillation circuit for applying first and second transmission signals with opposite phases to the first and second panels to induce the first and second panels to generate electromagnetic fields, a reception circuit for receiving the first and second sense signals from the first and second panels and amplifying the received sense signals by a predetermined gain, a comparison circuit for comparing the first and second sense signals received and amplified by the reception circuit with the first and second transmission signals from the oscillation circuit, respectively, for determination as to whether a sensed material is metal, a microcomputer for analyzing comparison data from the comparison circuit according to a gun analysis algorithm and determining on the basis of the analyzed result whether the sensed material belongs to a gun, and an indication unit for providing at least one of aural and visual indications of the result determined by the microcomputer. <IMAGE></p> |
