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2016-03-09 发布于山东
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Fast, high-resolution terahertz strongradarstrong imaging at 25 meters.pdf

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Fast, high-resolution terahertz strongradarstrong imaging at 25 meters.pdf

Fast, high-resolution terahertz radar imaging at 25 meters a a b a a Ken B. Cooper* , Robert J. Dengler , Nuria Llombart , Ashit Talukder , Anand V. Panangadan , a a a Chris S. Peay , Imran Mehdi , Peter H. Siegel aJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA, USA 91109-8099; bUniversidad Complutense de Madrid, Av. Arcos de Jalón 118, 28037 Madrid ABSTRACT We report improvements in the scanning speed and standoff range of an ultra-wide bandwidth terahertz (THz) imaging radar for person-borne concealed object detection. Fast beam scanning of the single-transceiver radar is accomplished by rapidly deflecting a flat, light-weight subreflector in a confocal Gregorian optical geometry. With RF back-end improvements also implemented, the radar imaging rate has increased by a factor of about 30 compared to that achieved previously in a 4 m standoff prototype instrument. In addition, a new 100 cm diameter ellipsoidal aluminum reflector yields beam spot diameters of approximately 1 cm over a 50 ×50 cm field of view at a range of 25 m, although some aberrations are observed that probably arise from misaligned optics. Through-clothes images of concealed pipes at 25 m range, acquired in 5 seconds, are presented, and the impact of reduced signal-to-noise from an even faster frame rate is analyzed. These results inform the requirements for eventually achieving sub-second or video-rate THz radar imaging. *er@; phone 1 818 354-4371; fax 1 818 393-4683 Keywords: terahertz