System for high-speed scanning and imaging security door channel with terahertz

Abstract

The invention discloses a system for high-speed scanning and imaging a security door channel with the terahertz. The purpose of the invention is to provide the system for imaging the security door channel with the terahertz, which has a simple structure, high stability and reliability, and strong resistance to external interference. The invention is realized by the following technical solution, inwhich at least two terahertz security checking devices are symmetrically opposite each other, and are fixed on the detection door frames of the entrance and the exit of the terahertz security door channel through a slot or a screw to form a terahertz security checking channel for the person to be checked (4) to come in and go out, thereby forming an active system for checking the security and imaging with the terahertz, the scanning area of which is greater than the height of the person. The technical solution comprises the steps of: the active system for checking the security and imaging with the terahertz using a terahertz antenna to emit milliwatt-level terahertz waves which can penetrate surface clothes of the person; the system measuring reflected terahertz signals to obtain a surface image of the person; the two terahertz security checking devices simultaneously scanning the front and the back of the person to be checked (4) with an method of interactive overlapping radiation detection of a synthetic aperture radar; and the two terahertz security checking devices transmitting the scan result to an external computer through cables for real-time imaging.

Description

technical field [0001] The invention relates to a safety check mainly used in airports, customs, subways, cultural heritage and other important buildings and large-scale event sites, which can quickly and accurately detect whether someone is carrying weapons, drugs, explosives and other contraband, effectively protecting the public Terahertz security inspection technology for the safety of life and property. In particular, it relates to a terahertz security gate channel imaging system. Background technique [0002] Terahertz (THz for short) radiation is a general term for electromagnetic radiation in a specific band. Usually it refers to electromagnetic waves with a frequency between 0.1THz and 10THz. In some specific occasions, it refers to electromagnetic waves between 0.3THz and 3THz. , and a broader definition with a frequency range up to 100THz. As a new type of coherent light source, terahertz has good penetration to many dielectric materials and non-polar liquids. ...

AI Technical Summary

Problems solved by technology

However, the current active type uses high-power femtosecond lasers to irradiate the human body with electromagnetic waves. The electro-optic crystals of high-power lasers can only focus on a small point (millimeter level), and the wavefront of the laser must be modulated. , too demanding on the environment, too expensive

Now most of the active types are classified into planar scanning according to the scanning method, which is relatively simple to implement, and the azimuth resolution can reach a quarter wavelength, but the side of the human body is relatively blurred.

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