14 February 2008 1.56 Terahertz 2-frames per second standoff imaging
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Abstract
A Terahertz imaging system intended to demonstrate identification of objects concealed under clothing was designed, assembled, and tested. The system design was based on a 2.5 m standoff distance, with a capability of visualizing a 0.5 m by 0.5 m scene at an image rate of 2 frames per second. The system optical design consisted of a 1.56 THz laser beam, which was raster swept by a dual torsion mirror scanner. The beam was focused onto the scan subject by a stationary 50 cm-diameter focusing mirror. A heterodyne detection technique was used to down convert the backscattered signal. The system demonstrated a 1.5 cm spot resolution. Human subjects were scanned at a frame rate of 2 frames per second. Hidden metal objects were detected under a jacket worn by the human subject. A movie including data and video images was produced in 1.5 minutes scanning a human through 180° of azimuth angle at 0.7° increment.
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Thomas M. Goyette, Jason C. Dickinson, Kurt J. Linden, William R. Neal, Cecil S. Joseph, William J. Gorveatt, Jerry Waldman, Robert Giles, and William E. Nixon "1.56 Terahertz 2-frames per second standoff imaging", Proc. SPIE 6893, Terahertz Technology and Applications, 68930J (14 February 2008); doi: 10.1117/12.764672; https://doi.org/10.1117/12.764672
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