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Proceedings Paper

A 190GHz active millimeter-wave imager
Author(s): Michael L. Brothers; Greg P. Timms; John D. Bunton; John W. Archer; Juan Y, Tello; Grahame C. Rosolen; Yue Li; Andrew D. Hellicar
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Paper Abstract

The design and testing of a 190 GHz imaging system is presented. The system features two beam-scanning antennas; the first transmits a horizontal fan beam and the second receives a vertical fan beam. By correlating the signals from the antennas, an estimate of the millimeter-wave reflectivity at the intersection of the fan beams is obtained. Each fan beam is scanned by rotating a small subreflector within the antenna; this simple rotation motion allows rapid scanning. The system is portable, currently approximately 0.6m × 0.6m × 2m high; the key size constraint is imposed by the 450 mm aperture length of the antennas. The imager has an angular resolution of 0.25° and a field of view of 14°×14°, resulting in a raw image of approximately 50 × 50 pixels. The raw image is processed using super-resolution techniques. Images will be presented which show the capability of the system to image metallic and ceramic objects beneath clothing. These images were obtained by illuminating the scene with signals from a frequency-doubled Gunn oscillator. While this paper focuses on active imaging, the system can also operate in passive mode with reduced sensitivity.

Paper Details

Date Published: 1 May 2007
PDF: 9 pages
Proc. SPIE 6548, Passive Millimeter-Wave Imaging Technology X, 654804 (1 May 2007); doi: 10.1117/12.719046
Show Author Affiliations
Michael L. Brothers, Commonwealth Scientific and Industrial Research Organisation (Australia)
Greg P. Timms, Commonwealth Scientific and Industrial Research Organisation (Australia)
John D. Bunton, Commonwealth Scientific and Industrial Research Organisation (Australia)
John W. Archer, Commonwealth Scientific and Industrial Research Organisation (Australia)
Juan Y, Tello, Commonwealth Scientific and Industrial Research Organisation (Australia)
Grahame C. Rosolen, Commonwealth Scientific and Industrial Research Organisation (Australia)
Yue Li, Commonwealth Scientific and Industrial Research Organisation (Australia)
Andrew D. Hellicar, Commonwealth Scientific and Industrial Research Organisation (Australia)


Published in SPIE Proceedings Vol. 6548:
Passive Millimeter-Wave Imaging Technology X
Roger Appleby; David A. Wikner, Editor(s)

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