One of the main advantages of mm-wave radiation is its capability to "see through" clothing and other materials, therefore enabling the detection of metallic and non-metallic weapons and explosives. Mm-wave imagers are able to perform stand-off screening, providing a solution in checkpoints and compound gates where the chance of suicide bomber attacks is high. A study has been made simulating real case scenarios to test practical detection performance and stand-off distances at a range of frequencies in this band, the results of which are presented.
In this paper the off-axis performance of an imaging array for an opto mechanical mm-wave imaging system has been studied. The analysed system consists of a spherical mirror and a plane polarizer. Both components are tilted to scan a vertical line. In order to avoid the beam degradation of the off-axis elements of the array a curved arrangement has been studied. The radius of this curvature has been analysed with a ray tracing program (OSLO) and a physical optics reflector antenna analysis software (GRASP) that can calculate the electromagnetic radiation of systems consisting of multiple reflectors. However, the performance achieved has been found to be similar to the performance of the planar array.
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