Aamer Saleem, C?line Canal, Lee AJ Davis, Roger J Green and David A Hutchins*
The transmission characteristics of radiation in the near-infrared range through fabric and similar materials have been investigated, to determine the manner in which the spatial distribution and amplitude levels of the through-transmitted signals are affected by the various physical characteristics of the sample material. A variety of fabric samples have been tested and factors such as material porosity, thickness and moisture content are seen to affect the through-transmission characteristics. Relationships have accordingly been derived to qualify the relative influence of such factors on signal amplitudes and distribution. The work is of interest to near infrared personal security screening applications.
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