25 April 2008 Passive THz imaging system for stand-off identification of concealed objects: results from a turn-key 16 pixel imager
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Abstract
Passive imaging of concealed objects at stand-off distances in excess of a few meters requires both excellent spatial, thermal and temporal resolution from the terahertz imaging system. The combination of these requirements while keeping the overall system cost at a reasonable level has been the motivation for this joint work. The THz imaging system under development is capable of sub-Kelvin NETD at video frame rates. In this paper we report the first imaging results from a 16-pixel array of superconducting antenna-coupled NbN vacuum-bridge microbolometers, operated within a cryogen-free, turn-key refrigerator. In addition to the system overview, we shall also address the uniformity of the detectors and present passive indoors raster-scanned imagery.
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A. Luukanen, A. Luukanen, L. Grönberg, L. Grönberg, T. Haarnoja, T. Haarnoja, P. Helistö, P. Helistö, K. Kataja, K. Kataja, M. Leivo, M. Leivo, A. Rautiainen, A. Rautiainen, J. Penttilä, J. Penttilä, J. E Bjarnason, J. E Bjarnason, C. R. Dietlein, C. R. Dietlein, M. D. Ramirez, M. D. Ramirez, E. N. Grossman, E. N. Grossman, } "Passive THz imaging system for stand-off identification of concealed objects: results from a turn-key 16 pixel imager", Proc. SPIE 6948, Passive Millimeter-Wave Imaging Technology XI, 69480O (25 April 2008); doi: 10.1117/12.784922; https://doi.org/10.1117/12.784922
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