Passive three-colour submillimetre-wave video camera
2013
Stand-off detection for concealed weapons is one of the applications for passive submillimetre-wave imaging. The
operating frequency (neglecting technology limitations) is often a compromise between the diffraction-limited angular
resolution for a fixed maximum aperture diameter, and the extinction of the signal in obscurant layers: At high
frequencies towards the 1 THz mark, excellent angular resolution is readily achievable with modest aperture diameters,
while scattering and attenuation by clothing is high which creates potentially more clutter rather than improving
detection capability. At lower frequencies towards 100 GHz, attenuation and scattering by clothing is much less
pronounced, albeit at significantly reduced spatial definition thanks to increased diffraction. In order to avoid the above-mentioned
compromise, we have constructed a three-band passive imaging system operating at effective centre
frequencies of 250 GHz, 450 GHz and 720 GHz. Aspects of the system will be presented.
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