Active MMW imaging technique for contraband detection

Abstract

A novel active millimeter-wave (MMW)quasi-aptical imaging technique, which can be effectively used for detection of concealed objects. is presented. The operation principle is based on multi-parameter active illumination of the objects with multiply decomposed and encoded radiation, separate acquisition of quasi-aptical partial images, and following digital synthesis of resultant images exhibiting enhanced quality and information content. The technique utilizes capabilities of artificial MMW sources and switching components to sweep and modulate MMW radiation within wide ranges of radiation physical parameters.Experimental and numerical simulation results are presented.

System modelling for millimeter-wave imaging systems using a 2.5D calculation method

“…The generic imaging system that we wish to model is described in [3] and uses a switchable diffuser approach to destroy the coherence of the illuminating beam. In this way coherent image aberrations could be reduced by averaging over a number of images.…”

“…Active millimeter wave imaging systems are considered one of the most promising systems for the development of allround versatile indoor security applications [1][2][3][4][5]. Due to the nature of the illumination source, coherent imaging aberrations will be present in the images formed by the detector, when implemented as a power detector array.…”

On Body Concealed Weapon Detection Using a Phased Antenna Array

“…Considerable research effort has been invested into developing systems capable of fulfilling these requirements; with the very great majority of these efforts taking a millimeter wave imaging approach [1][2][3][4][5][6][7][8][9][10][11][12][13]. Research in millimetre wave imaging, in the frequency range of 30-300 GHz has yielded several systems which are currently used to screen people in sensitive areas such as airports.…”