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, Thomas M. Goyette, Jason C. Dickinson, Jason C. Dickinson, Kurt J. Linden, Kurt J. Linden, William R. Neal, William R. Neal, Cecil S. Joseph, Cecil S. Joseph, William J. Gorveatt, William J. Gorveatt, Jerry Waldman, Jerry Waldman, Robert Giles, Robert Giles, William E. Nixon, 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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