Active terahertz security inspection imaging method and system

Abstract

The invention, which belongs to the technical fields of security inspection equipment and image processing, discloses an active terahertz security inspection imaging method and system. The security inspection imaging system is characterized in that a data acquisition and processing system is connected with a terahertz transmitter, a terahertz linear array detector and a band-shaped beam scanning control unit respectively; a beam splitter is connected with a beam shaping optical assembly, the terahertz linear array detector and a terahertz focusing optical assembly respectively; and the band-shaped beam scanning control unit is connected with the terahertz focusing optical assembly, the band beam scanning control unit, and a tested target. In addition, according to the active terahertz security inspection imaging method, on the basis of a mode of terahertz radiation emitted by a terahertz source, one-dimensional scanning of a band-shaped beam focusing beam, and receiving by a linear array terahertz detector, irradiation and scanning of the whole target plane are completed rapidly to achieve an objective of rapid imaging and checking on a target. With the active terahertz security inspection imaging system, the imaging quality is improved. Because of the one-dimensional scanning way, the imaging time is saved; and with the array detector, the circuit system structure is simplified, the system cost is lowered, and the expenditure is reduced.

Description

technical field [0001] The invention belongs to the technical field of security inspection equipment and image processing, and in particular relates to an active terahertz security inspection imaging method and system. Background technique [0002] In public places (such as border checkpoints, airports, stations, subways, ports, museums, stadiums or other important public venues), security checks are mainly based on X-ray luggage imaging, supplemented by metal detectors and manual inspections to detect pedestrians and carry-on luggage thing. However, X-rays are harmful to the human body, and cannot effectively detect explosives such as C4 explosives and non-metallic dangerous items such as plastic or ceramic weapons. At the same time, there are disadvantages such as high false alarm rate and long time-consuming secondary inspection. [0003] Terahertz is an electromagnetic wave with a wavelength between infrared rays and microwaves. It is smaller than the photon energy of X...

AI Technical Summary

Problems solved by technology

The active terahertz imaging system in the laboratory and the implementation methods in the above patents mainly use technologies such as point-by-point scanning imaging and area array imaging. Point-by-point scanning uses various motor structures for two-dimensional scanning, which takes a long time and is difficult to target for efficient inspection

Area array imaging, such as focal plane detection area array imaging, imaging based on electro-optical sampling methods, etc., has the disadvantages of relatively complex systems and expensive equipment.

Images