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7 November 2005 Active and passive millimeter- and sub-millimeter-wave imaging
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We have developed several millimeter/submillimeter/terahertz systems to study active and passive imaging and associated phenomenology. For measuring the transmission and scattering properties of materials, we have developed a dual rotary stage scattering system with active illumination and a Fourier Transform spectrometer. For imaging studies, we have developed a system based on a 12-inch diameter raster-scanned mirror. By interchange of active sources and both heterodyne and bolometric detectors, this system can be used in a variety of active and passive configurations. The laboratory measurements are used as inputs for, and model calibration and validation of, a terahertz imaging system performance model used to evaluate different imaging modalities for concealed weapon identification. In this paper, we will present examples of transmission and scattering measurements for common clothing as well as active imaging results that used a 640 GHz source and receiver.
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Douglas T. Petkie, Frank C. De Lucia, Corey Castro, Paul Helminger, Eddie L. Jacobs, Steven K. Moyer, Steve Murrill, Carl Halford, Steve Griffin, and Charmaine Franck "Active and passive millimeter- and sub-millimeter-wave imaging", Proc. SPIE 5989, Technologies for Optical Countermeasures II; Femtosecond Phenomena II; and Passive Millimetre-Wave and Terahertz Imaging II, 598918 (7 November 2005);

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