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Proceedings Paper

Terahertz imaging system for stand-off detection of threats
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Paper Abstract

Suicide bombers and hidden bombs or explosives have become serious threats especially for mass transportation. Until now there exists no established system which can be used against these threats. Therefore new technologies especially for stand-off detection of threats are required. Terahertz (THz) rays offer an alternative inspection method, which can cope with these new challenges. Major advantages of THz radiation as compared to other spectral regions are the possibility to penetrate through clothes and that THz radiation is not harmful for human health. In this report the design and results of a THz stand-off detection system will be presented. The sensor is based on active illumination of the object and sensitive heterodyne detection of reflected and backscattered radiation. The system operates at about 0.8 THz. A THz laser is used for illumination and a superconducting hot-electron bolometric mixer for detection. The local oscillator required for heterodyne detection is a multiplied microwave source. The optical system is designed to allow for stand-off detection at 20 m with a spatial resolution less than 2 cm.

Paper Details

Date Published: 4 May 2007
PDF: 7 pages
Proc. SPIE 6549, Terahertz for Military and Security Applications V, 65490A (4 May 2007); doi: 10.1117/12.719309
Show Author Affiliations
H.-W. Hübers, German Aerospace Ctr. (Germany)
A. D. Semenov, German Aerospace Ctr. (Germany)
H. Richter, German Aerospace Ctr. (Germany)
U. Böttger, German Aerospace Ctr. (Germany)

Published in SPIE Proceedings Vol. 6549:
Terahertz for Military and Security Applications V
James O. Jensen; Hong-Liang Cui, Editor(s)

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