W-waveband passive millimeter-wave imaging system for security check

Abstract

The invention discloses a W-waveband passive millimeter-wave imaging system for security check and belongs to the technical field of security check. The W-waveband passive millimeter-wave imaging system for security check comprises a W-waveband millimeter-wave radiometer, a Cassegrain antenna, a smooth metal reflecting surface, a horizontal rotary table, a longitudinal rotary table, a signal collection unit, a computer and a PLC (programmable logic controller) control unit, wherein the smooth metal reflecting surface is fixed on the longitudinal rotary table at a 45-degree angle, the longitudinal rotary table and the Cassegrain antenna are fixed on the horizontal rotary table coaxially, a feed source of the Cassegrain antenna is connected with the millimeter-wave radiometer through a waveguide, the millimeter-wave radiometer is connected with the signal collection unit, and the signal collection unit is connected with the computer. The W-waveband passive millimeter-wave imaging system for security check has the advantages of simple structure, low cost, small size, low power consumption, high stability, high imaging speed and capability of detecting hidden dangerous articles from a human body effectively.

Description

technical field [0001] The invention belongs to the technical field of security inspection, and relates to an imaging system, in particular to a W-band passive millimeter-wave imaging system and a method thereof for security inspection. Background technique [0002] As people pay more and more attention to safety issues, higher requirements are put forward for the safety, reliability and intelligence of the security inspection system. At present, the security inspection department mainly uses X-ray security inspection equipment to detect contraband in luggage. The security inspection has strong detection capabilities and can obtain high-resolution perspective images. However, X-ray ionization is more harmful to the human body and cannot be used to detect hidden objects on people. Contraband. Even though x-ray machines with low radiation doses currently exist, they are not easily accepted by the public. For example, the so-called "weak photon" human body security detector p...

AI Technical Summary

Problems solved by technology

The common scanning method is mainly row-column scanning, which needs to be continuously accelerated and decelerated during the scanning process, the imaging time is long, and the resolution is low; or there is an improved method, using one-dimensional electronic scanning and another two-dimensional mechanical scanning, which accelerates the scanning process. Imaging time, but requires arrays of multiple receivers, greatly increasing system cost

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