A novel and low-cost technique of standoff detection is presented that permits the detection of explosives and other
contraband substances that are hidden under clothing at standoff distances . The technique uses NIR beams of
wavelengths found in ordinary domestic remote controls, combined with various signal recovery techniques commonly
used in astronomy. This alternative technique, whilst sophisticated, utilises readily available optoelectronic components.
It is inherently far more portable than currently available commercial alternatives and is easy to use. A pre-production
prototype successfully detected and identified the common homemade explosives, ammonium nitrate and hydrogen
peroxide, which were concealed behind clothing from a distance of 5 metres under daytime conditions. In principle, this
distance could be extended as far as 50 metres without a significant increase in cost or complexity. Another advantage of
this device is that apart from providing standoff chemical signatures and analyses of concealed substances, this it can
simultaneously superimpose the chemical information on top of a normal TV image in a data fusion approach; that is, an
image appears on the screen , the area/subject of interest can be zoomed in on and enlarged and a representation of a
chemical spectrum appears on the screen underneath the image. A supplemental technique is also reported upon that,
under the appropriate circumstances, enable actual imaging of concealed objects to be accomplished.