In the millimetre-wave region of the spectrum, many lightweight materials such as clothing fabrics appear as transparent. This property opens up applications in the security area for scanning of personnel for concealed threat objects or contraband. The system described here is a mechanically scanned millimetre-wave imaging camera that can be interchangeably used in an active or passive mode and provides rapidly refreshed, raster imagery with high efficiency across all millimetre-wave frequencies. The proposed use of the imager is in an active configuration to observe a checkpoint or crowd scene at stand-off distances of up to 50 m. Target objects to be detected are the hidden metallic components associated with improvised explosive device (IED) constructions. A typical IED consists of several explosive filled pipes strapped to the body or clusters of small metallic objects embedded in explosives. Trials have yielded positive results by showing the presence of concealed metallic objects on people at distances of 25 m. Objects detected have included simulated IED constructions such as metal pipes and clusters of nuts and bolts. These tests have been conducted using both continuous wave (CW) and frequency modulated CW (FMCW) front-end configurations. The use of FMCW radar introduces the possibility of gathering range as well as intensity information from the scene. This additional range information opens up significant possibilities in pinpointing people carrying threat objects particularly in crowd situationswhere two-dimensional intensity patterns may not provide sufficient information to identify a threat location.


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    Title :

    Stand-Off Detection of Concealed Improvised Explosive Devices (IEDS)


    Contributors:


    Publication date :

    2006-01-01


    Size :

    11 pages




    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




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