Journal
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
Volume 31, Issue 11, Pages 1355-1369Publisher
SPRINGER
DOI: 10.1007/s10762-010-9716-y
Keywords
THz; Submillimeter-wave; Imaging; Camera; Bolometer; TES
Funding
- German Ministry of Research and Education (BMBF) [13N9307]
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We present the concept and experimental set-up of a passive submillimeter-wave stand-off imaging system for security applications. Our ambition is the design of an application-ready and user-friendly camera providing high sensitivity and high spatial resolution at video frame rates. As an intermediate step towards this goal, the current prototype already achieves a frame rate of 10 frames per second and a spatial resolution below 2 cm at 8 m distance. The camera is the result of a continuous development and a unique concept that yielded first high-resolution passive submillimeter-wave images provided by cryogenic sensors in May et al. (2007). It is based on an array of 20 superconducting transition-edge sensors operated at a temperature of 450 mK, a closed-cycle cooling system, a Cassegrain-type optics with a 50 cm main mirror, and an opto-mechanical scanner. Its outstanding features are the scanning solution allowing for high frame rates and the compact and integrated system design.
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