Abstract: System for detecting explosive substances and drugs by nuclear quadrupole resonance having a central processing unit (UC) which connects to a storage, data processing, and interface unit (USPI) provided with a user console (1C) and a with a head (CS1) for scanning explosives/drugs around the legs and a head (CS2) for scanning suspicious objects on the ground or that cannot be moved having a radio processing system (SPR) which includes a programmable RF signal generator (DDS) which transmits RF pulses to a power amplifier (AP) coupled to an interface for gain control and for the acquisition of the reflected signal level (IAP), a series-parallel tuning circuit (CA) consisting of a flat spiral ferrite-core coil (L) and two variable capacitors (CV1, CV2) driven by two stepper motors (M1, M2) which are controlled by an automatic tuning matching module (WIAA) through control interfaces.

Abstract: The present invention is directed to a detector and a method for detecting explosive substances and drugs by nuclear quadrupole resonance designed for screening baggage and people at border crossing points in airports, ports, railway stations and in other locations which require strong measures against terrorism and smuggling of prohibited substances such as explosives and drugs.