16 July 2003 Millimeter-wave imaging for concealed weapon detection
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Full body, real-time, millimeter-wave imaging systems have been developed at the Pacific Northwest National Laboratory for the detection of body-worn, concealed weapons and contraband at security checkpoints. These security systems employ methods derived from microwave holography techniques that utilize phase and amplitude information recorded over a two-dimensional aperture to reconstruct a focused image of the target. Millimeter-wave imaging is well suited for the detection of concealed weapons or other contraband carried on personnel, since millimeter waves are non-ionizing, readily penetrate common clothing material, and are reflected from the human body and any concealed items. In this paper, wide-bandwidth, three-dimensional, holographic microwave imaging techniques and a full-body, planar, millimeter-wave imaging system are described.
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Douglas L. McMakin, David M. Sheen, Thomas E. Hall, "Millimeter-wave imaging for concealed weapon detection", Proc. SPIE 5048, Nondestructive Detection and Measurement for Homeland Security, (16 July 2003); doi: 10.1117/12.484704; https://doi.org/10.1117/12.484704

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