A video velocity scanning system based on passive terahertz imaging

Abstract

The invention discloses a passive terahertz imaging based video speed scanning system, which comprises a first wedge lens acquiring a scanned object, a second wedge lens and a feed source antenna, wherein the wedge lenses are provided with a planar bottom surface and a wedge reflecting surface opposite to the planar bottom surface. The characteristics lie in that the system further comprises a dielectric lens, the second wedge lens is vertically arranged at the lower side of the first wedge lens and receives reflecting and scanning light information of the first wedge lens, the dielectric lens is vertically arranged between the first wedge lens and the second wedge lens and used for concentrating reflecting light information of the first wedge lens and projecting the concentrated reflecting light information to the second wedge lens, the light projecting and transmitting direction of the dielectric lens is perpendicular to the ground, and the feed source antenna is used for receiving light information reflected by the second wedge lens. The video speed scanning system improves a defect of long time of terahertz band close-range security inspection imaging, and realizes high-resolution fast video speed scanning by adopting a mode of combining the dielectric lens, the dual rotating wedge lenses and a detector array; and the video speed scanning system is simple in control, high in accuracy and applicable to the field of close-range terahertz security inspection imaging.

Description

technical field [0001] The invention relates to a video velocity scanning system based on passive terahertz imaging. Background technique [0002] In recent years, the security threats to public places at home and abroad have been increasing, and public security issues have attracted much attention. Traditional optical, infrared, X-ray and metal detection security inspection systems cannot detect some potential hidden items, especially some non-metallic weapons, so the security inspection of human body and accompanying items needs to be solved urgently. With the rapid development of imaging technology, breakthroughs have been made in the detection performance of the international security inspection system. The operating frequency band of the system is mainly in the range of millimeter wave and terahertz wave. [0003] Millimeter wave (MMW) and low-frequency terahertz (THz) waves have longer wavelengths, have stronger penetration and diffraction capabilities, and can provid...

AI Technical Summary

Problems solved by technology

However, the current passive THz / MMW imaging security equipment that can be practically applied to public places such as customs, airports, and subway security checks still has problems such as long imaging time, low spatial resolution, and high cost, which lead to slow development of technology research and commercialization

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