26 April 2010 Fast high-resolution terahertz radar imaging at 25 meters
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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.
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Ken B. Cooper, Ken B. Cooper, Robert J. Dengler, Robert J. Dengler, Nuria Llombart, Nuria Llombart, Ashit Talukder, Ashit Talukder, Anand V. Panangadan, Anand V. Panangadan, Chris S. Peay, Chris S. Peay, Imran Mehdi, Imran Mehdi, Peter H. Siegel, Peter H. Siegel, } "Fast high-resolution terahertz radar imaging at 25 meters", Proc. SPIE 7671, Terahertz Physics, Devices, and Systems IV: Advanced Applications in Industry and Defense, 76710Y (26 April 2010); doi: 10.1117/12.850395; https://doi.org/10.1117/12.850395
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