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Proceedings Paper

Real-time passive terahertz imaging system for standoff concealed weapons imaging
Author(s): Arttu Luukanen; Leif Grönberg; Markus Grönholm; Petteri Lappalainen; Mikko Leivo; Anssi Rautiainen; Aleksi Tamminen; Juha Ala-Laurinaho; Charles R. Dietlein; Erich N. Grossman
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Paper Abstract

The performance of stand-off imaging systems of concealed weapons in the mm-wave range remains limited by the relatively poor angular resolution using practical aperture sizes. For this reason, increasing the operating frequency of the systems is desired, but in practice is hard to realize due to the lack of affordable, low noise amplifiers well beyond 100 GHz. In this paper we present a passive terahertz imaging system which acquires passive terahertz (~200 GHz - ~1 THz) imagery near video frame rate. The system, one copy of which is built in Finland and the other in the U.S., is based on a 64 pixel linear array of superconducting antenna-coupled microbolometers operated within a commercial cryogen-free closed cycle cryocooler, and utilizes conical scanning Schmidt optics. Quantitative measurements on the imager resolution metrics (thermal, spatial and temporal) will be presented. The results from field tests at the Helsinki-Vantaa airport will be presented.

Paper Details

Date Published: 27 April 2010
PDF: 8 pages
Proc. SPIE 7670, Passive Millimeter-Wave Imaging Technology XIII, 767004 (27 April 2010); doi: 10.1117/12.850369
Show Author Affiliations
Arttu Luukanen, MilliLab, VTT Technical Research Ctr. of Finland (Finland)
Leif Grönberg, VTT Technical Research Ctr. of Finland (Finland)
Markus Grönholm, VTT Technical Research Ctr. of Finland (Finland)
Petteri Lappalainen, VTT Technical Research Ctr. of Finland (Finland)
Mikko Leivo, VTT Technical Research Ctr. of Finland (Finland)
Anssi Rautiainen, VTT Technical Research Ctr. of Finland (Finland)
Aleksi Tamminen, MilliLab, Aalto Univ. School of Science and Technology (Finland)
Juha Ala-Laurinaho, MilliLab, Aalto Univ. School of Science and Technology (Finland)
Charles R. Dietlein, National Institute of Standards and Technology (United States)
Erich N. Grossman, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 7670:
Passive Millimeter-Wave Imaging Technology XIII
David A. Wikner; Arttu R. Luukanen, Editor(s)

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