| 摘要 |
A detection system operable at millimetre or sub-millimetre wavelengths includes detection means adapted to detect radiation at two distinct wavebands, wherein a first waveband is chosen such that it has a relatively high atmospheric absorbency to electromagnetic radiation, and the second waveband is chosen to have a relatively low atmospheric absorbency to electromagnetic radiation. The system is further adapted to take measurements from at least two different regions on a target, and to process the measurements to give an indication that the target contains an object of interest. The processing may comprise comparing measurement differences at a given waveband to reference data obtained from test measurements, or from computer models of targets. The detection system provides the ability to detect objects of interest without the need to provide a millimetric or sub-millimetric image of the target.
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