Abstract: As a result of its relatively short wavelength, coupled with relatively high penetration of many materials, millimeter- wave imaging provides a powerful tool for the detection of concealed articles. By using a passive approach such as that implemented here, it is possible to image (detect) concealed weapons and articles or look through certain types of walls, all without generating any form of radiation that might raise health concerns. In this paper, we present details of the upgrades to our imager that will result in a wide field of view imaging at better than 20 Hz frame rate and with an instantaneous sensitivity of better than 5 Kelvin. High resolution image data taken at stand-off distances of 12 to 27 feet are presented as representing state-of-the-art in passive millimeter-wave imaging. Details of the next generation passive imager, which will produce true real-time images with better than 1 Kelvin sensitivity will be discussed.!3
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