A novel optical-mechanical scanning passive THz imaging system

Liquan Dong*, Weiwen Zhu, Yuejin Zhao, Xiaohua Liu, Jingshui Zhang, Weiyu Liu, Xiaoxiao Zhou

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)

Abstract

A novel passive THz imaging system of single channel and optical-mechanical scanning is described. It employs a Cassegrain antenna of 390mm in diameter, and achieves the two-dimensional scanning imaging via the cooperation of a line scanning mirror, driven by a crank-rocker mechanism in a high speed, and the motion of the frame scanning mirror. Thus, the system has many advantages such as low cost, simple structure, efficient and so on. The single frame imaging time of the system is only 20s, the field of view (FOV) is 30°× 36°, and the angle resolution is up to 0.6°. The experimental results show that the system can image the human body, and effectively detect dangerous items concealed under the clothes. For the images, processed by a sparse representation-based image denoising and inpainting algorithm, which generalizing the K-Means clustering process, for adapting dictionaries in order to achieve sparse signal representations. The processed image quality is improved obviously. The experimental results demonstrate, better RMSE and highest Peak Signal-to-Noise Ratio (PSNR) compared with traditional methods can be obtained.

Original languageEnglish
Title of host publicationIRMMW-THz 2012 - 37th International Conference on Infrared, Millimeter, and Terahertz Waves
DOIs
Publication statusPublished - 2012
Event37th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2012 - Wollongong, NSW, Australia
Duration: 23 Sept 201228 Sept 2012

Publication series

NameInternational Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
ISSN (Print)2162-2027
ISSN (Electronic)2162-2035

Conference

Conference37th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2012
Country/TerritoryAustralia
CityWollongong, NSW
Period23/09/1228/09/12

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