Passive terahertz camera for standoff security screening

E. Grossman (Corresponding Author), C. Dietlein, J. Ala-Laurinaho, Mikko Leivo, Leif Grönberg, Markus Grönholm, Petteri Lappalainen, Anssi Rautiainen, A. Tamminen, Arttu Luukanen

    Research output: Contribution to journalArticleScientificpeer-review

    87 Citations (Scopus)

    Abstract

    We describe the construction and performance of a passive, real-time terahertz camera based on a modular, 64-element linear array of cryogenic hotspot microbolometers. A reflective conical scanner sweeps out a 2m×4m (vertical×horizontal) field of view (FOV) at a standoff range of 8m. The focal plane array is cooled to 4K in a closed cycle refrigerator, and the signals are detected on free-standing bridges of superconducting Nb or NbN at the feeds of broadband planar spiral antennas. The NETD of the focal-plane array, referred to the target plane and to a frame rate of 5s−1, is 1.25K near the center of the array and 2K overall.
    Original languageEnglish
    Pages (from-to)E106-E120
    Number of pages15
    JournalApplied Optics
    Volume49
    Issue number19
    DOIs
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed

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