Nuclear quadrupole resonance-based antenna part of explosive and drug detection system

Abstract

The present invention relates to a nuclear quadrupole resonance-based antenna part of an explosive and drug detection system. The antenna part comprises an emission antenna and a reception antenna which surround a channel of the detection system, the emission antenna is mainly composed of two emission coils which are coaxial and parallel, have the equal shapes and form a HeImholtz coil, the magnetic field intensity in the HeImholtz coil is uniform, and the coaxial distance of the two emission coils forming the HeImholtz coil is decided by the sizes of the emission coils. The emission antenna also comprises at least one conductive coil which is coaxial and parallel and has the equal shape with the two emission coils separately, so that every two adjacent emission coils or conductive coils form the same HeImholtz coils separately to prolong the length of the uniform magnetic field in the emission antenna. The reception antenna comprises at least one reception coil located between the emission antennas. The effects of the present invention are that the magnetic field intensity in the detection channel is uniform while the length of the detection channel is prolonged, and a nuclear quadrupole technology can detect the explosives and drugs normally.

Description

technical field [0001] The invention relates to the field of explosives and narcotics detection, in particular to an antenna part of an explosives and narcotics detection system based on nuclear quadrupole moment resonance. Background technique [0002] Metal detection technology, terahertz detection technology, X-ray transmission detection technology, neutron detection technology, and other traditional drug and explosives detection technologies, although they can detect potential safety hazards to a certain extent, there are also many problems in the application process. Big limitations. Metal detectors can only detect explosives with metal devices, and often produce false alarms for non-dangerous metals such as keys, mobile phones, zippers, etc. Terahertz detection technology has poor imaging effects, is very difficult and expensive ; X-ray transmission detection technology can only distinguish organic matter, inorganic matter, and metal; neutron detection technology is d...

AI Technical Summary

Problems solved by technology

The magnetic field provided by the transmitting antenna must be a strong and uniform magnetic field. Such a uniform magnetic field is usually constructed through a Helmholtz coil, but the coaxial size of the Helmholtz coil is limited by the size of the coil. For For the luggage machine, the size of the Helmholtz coil is limited, and the distance between the coils is also limited, so the space for its uniform magnetic field is also limited

And our receiving coil adopts narrow-band receiving. When the space of uniform magnetic field is relatively small, the layout of the narrow-band receiving antenna for multi-sample detection will be very close. When the narrow-band receiving coils are relatively close to each other, especially the resonance frequency points are far apart. Not far away, there will be very serious mutual coupling

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