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15 November 1993 Contraband detection through clothing by means of millimeter-wave imaging
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Plastic weapons and explosives concealed under clothing present unique challenges to conventional contraband detection technology. Nonmetallic, nonmagnetic objects cannot be detected by conventional systems that use low-frequency magnetic fields. Common techniques that can reveal these types of contraband involve X-rays or other ionizing radiation, which are inappropriate for use on the human body. We have found that millimeter-wavelength radiation is an excellent means for revealing objects hidden beneath clothing. Naturally occurring thermal radiation from the subject can be used in a process called passive imaging. An alternative process called active imaging uses one or more millimeter-wave sources to illuminate the subject. In this paper we describe the basic theory of millimeter-wave imaging. We present single-channel scanned images of both metal and plastic objects concealed beneath ordinary clothing. The clothing appears substantially transparent and the objects are distinguishable. The paper concludes with a discussion of prospective advances that should make multiple-channel real-time imaging systems practical.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. Richard Huguenin, C.- T. Hsieh, J. E. Kapitzky, Ellen L. Moore, Karl David Stephan, and A. S. Vickery "Contraband detection through clothing by means of millimeter-wave imaging", Proc. SPIE 1942, Underground and Obscured Object Imaging and Detection, (15 November 1993);

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