Millimeter wave imaging system and security check system

Abstract

Disclosed is a millimeter wave imaging system. The system comprises an emission branch module used for generating millimeter wave radiation signals; an emission antenna array connected with the emission bench module for converting the millimeter wave radiation signals into circular polarized waves for radiation on detected personnel, wherein the circular polarized waves are levorotation circular polarized wave or dextrorotation circular polarization; a receiving antenna array arranged at the same side as the emission antenna array for receiving reflected echo signals, wherein the polarization direction of the receiving antenna array is consistent with the polarization direction of the emission antenna array; a receiving branch module connected with the receiving antenna array for demodulating the echo signals; and an image processing module connected with the receiving branch module for performing imaging processing on the demodulated echo signals and outputting imaged images. The millimeter wave imaging system can protect privacy of the detected personnel and improve the recognition rate of dangerous articles. The invention further relates to a security check system.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave imaging, in particular to a millimeter wave imaging system and a security inspection system. Background technique [0002] Modern human security screening systems need to quickly and accurately identify dangerous goods carried by human beings, especially in airports, railway stations, customs and other secure buildings. Traditional security inspection systems include metal detection systems, trace detection systems, X-ray security inspection systems, etc. Among them, the metal detection system can only detect metal objects; the trace detection system is only effective for explosives and drugs; the X-ray security inspection system can detect metals, non-metals, explosives, drugs, etc., but because X-rays are harmful to the human body, The use of X-ray inspection systems is therefore limited. [0003] Millimeter waves are electromagnetic waves between microwaves and light waves. Its f...

AI Technical Summary

Problems solved by technology

The characteristic information of human skin in the imaging of the traditional millimeter wave imaging system is too obvious, which easily exposes the privacy of the tested person, and the outline of dangerous objects is blurred, resulting in a decrease in the recognition rate of dangerous objects

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