Terahertz Imaging Systems With Aperture Synthesis Techniques

Viktor Krozer, Torsten Löffler, Jørgen Dall, Anders Kusk, Finn Eichhorn, Rasmus Kjelsmark Olsson, Jonas Christian Due Buron, Peter Uhd Jepsen, Vitaliy Zhurbenko, Thomas Jensen

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    This paper presents the research and development of two terahertz imaging systems based on photonic and electronic principles, respectively. As part of this study, a survey of ongoing research in the field of terahertz imaging is provided focusing on security applications. Existing terahertz imaging systems are reviewed in terms of the employed architecture and data processing strategies. Active multichannel measurement method is found to be promising for real-time applications among the various terahertz imaging techniques and is chosen as a basis for the imaging instruments presented in this paper. An active system operation allows for a wide dynamic range, which is important for image quality. The described instruments employ a multichannel high-sensitivity heterodyne architecture and aperture filling techniques, with close to real-time image acquisition time. In the case of the photonic imaging system, mechanical scanning is completely obsolete. We show 2-D images of simulated 3-D image data for both systems. The reconstruction algorithms are suitable for 3-D real-time operation, only limited by mechanical scanning.
    Original languageEnglish
    JournalI E E E Transactions on Microwave Theory and Techniques
    Issue number7
    Pages (from-to)2027 - 2039
    Publication statusPublished - 2010


    • submillimeter-wave technology
    • photonic systems
    • Femtosecond systems
    • submillimeter-wave imaging
    • photonic detectors
    • synthetic aperture imaging
    • terahertz imaging
    • synthetic aperture radar


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