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Improving the quality of active millimeter wave standoff imaging by incorporating the cross-polarized scattering

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Document pages: 11 pages

Abstract: In this paper, we report a polarimetry-based THz imaging technique thathighly benefits from backscatter data reflected from PEC hidden objects,considering the edge diffractions of the object as a key point. First, based onphysical optic principles, we investigate the cross-polarized reflections ofPEC objects in order to show the superiority of reflections of the edges toother parts of the object. Next, we represent the results of a near filedsimulation using Feko to study the differences between cross and co-polarizedreflections of a PEC object and the human body beneath it. To a furtherillustration, our experimental results are presented in which we utilized a THzimaging system consisting of a semiconductor-based THz camera and a hornantenna operating at 100 GHz as the source. Cross-polarized backscatter data isanalyzed to distinguish PEC objects from the human body. Besides, we used twoorthogonal linear polarizations of the source to maximize backscattering fromorthogonal edges. Experimental results show a noticeable improvement in edgedetection of hidden objects indicating that this method can result in highaccuracy in THz real-time imaging.

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