Canal, Celine M., Saleem, Aamer, Green, Roger and Hutchins, David A. (2010) Near-infrared spectroscopy for personal screening. In: Conference on Optics and Photon for Counterterrorism and Crime Fighting VI/Optical Materials in Defence Systems Technology VII , Toulouse, France, 20-23 Sep 2010. Published in: Proceedings of SPIE - International Society for Optical Engineering, Vol.7838 78380G-78380G. ISSN 0277-786X. doi:10.1117/12.865831

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Abstract

This paper will demonstrate that near infrared (NIR) signals at wavelengths in the range 0.9 to 2.5 microns can be used for personal screening applications. At these wavelengths, there is sufficient spectral information to provide chemical identification, while still providing transmission through many types of common clothing materials. Thus, chemical identification in diffuse reflection is possible.

Initial measurements on selected clothing materials have indicated that there is sufficient transmission to allow NIR spectra from concealed chemicals to be collected. The effect of the clothing material on the observed spectra has also been quantified. The clothing materials ranged from cotton to man-made fibres. Spectra have been collected at stand-off distances of several metres or more, using a suitable lens system and an NIR spectrometer. The optics required to achieve this will be described, and some spectra from chemicals hidden behind clothing will be presented. The further steps necessary to provide correct identification of chemicals such as ammonium nitrate in granular form will also be given, involving signal analysis methods. A set of spectra will be shown that have been collected and analysed, for a wide range of clothing fabric materials, indicating that the technique could have wide application to personal screening situations.

Item Type:	Conference Item (Paper)
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering
Journal or Publication Title:	Proceedings of SPIE - International Society for Optical Engineering
Publisher:	S P I E - International Society for Optical Engineering
ISSN:	0277-786X
Official Date:	2010
Dates:	Date Event 2010 Published
Volume:	Vol.7838
Page Range:	78380G-78380G
DOI:	10.1117/12.865831
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Conference Paper Type:	Paper
Title of Event:	Conference on Optics and Photon for Counterterrorism and Crime Fighting VI/Optical Materials in Defence Systems Technology VII
Type of Event:	Conference
Location of Event:	Toulouse, France
Date(s) of Event:	20-23 Sep 2010

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