Passive THz imaging system for stand-off identification of concealed objects: Results from a turn-key 16 pixel imager

A. Luukanen, Leif Grönberg, Tuomas Haarnoja, Panu Helistö, K. Kataja, Mikko Leivo, Anssi Rautiainen, J. Penttilä, J. E. Bjarnason, C. R. Dietlein, M. D. Ramirez, E. N. Grossman

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

    13 Citations (Scopus)


    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.
    Original languageEnglish
    Title of host publicationPassive Millimeter-Wave Imaging Technology XI
    Subtitle of host publicationSPIE Defence and Security Symposium
    EditorsRoger Appleby
    PublisherInternational Society for Optics and Photonics SPIE
    Number of pages9
    ISBN (Print) 9780819471390
    Publication statusPublished - 2008
    MoE publication typeA4 Article in a conference publication
    EventSPIE Defense and Security Symposium: Passive Millimeter-Wave Imaging Technology XI - Orlando, United States
    Duration: 16 Mar 200820 Mar 2008

    Publication series

    SeriesProceedings of SPIE


    ConferenceSPIE Defense and Security Symposium
    Country/TerritoryUnited States


    • Bolometers
    • Concealed weapons detection
    • Cryogenic detectors
    • Passive mm-wave imaging
    • Stand-off detection
    • Superconducting sensors
    • THz imaging


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