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NIR spectroscopy with multivariate calibration and lock-in amplification to detect chemicals concealed behind fabrics

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Saleem, Aamer, Canal, Celine, Hutchins, David A. and Green, Roger (2011) NIR spectroscopy with multivariate calibration and lock-in amplification to detect chemicals concealed behind fabrics. In: Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XII, Orlando, Florida, USA, 26th April 2011. Published in: NIR, IR, and Photothermal Detection of Explosives, Vol. 8018 80181I-80181I. doi:10.1117/12.883839 ISSN 0277786X.

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Official URL: http://dx.doi.org/10.1117/12.883839

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Abstract

The detection of specific chemicals when concealed behind a layer of clothing is reported using near infrared (NIR) spectroscopy. Concealment modifies the spectrum of a particular chemical when recorded at stand-off ranges of three meters in a diffuse reflection experiment. The subsequent analysis to identify a particular chemical has involved employing calibration models such as principal component regression (PCR) and partial least squares regression (PLSR). Additionally, detection has been attempted with good results using neural networks. The latter technique serves to overcome nonlinearities in the calibration/training dataset, affording more robust modelling. Finally, lock-in amplification of spectral data collected in through-transmission arrangement has been shown to allow detection at SNR as low as -60dB. The work has been shown to both allow detection of specific chemicals concealed behind a single intervening layer of fabric material, and to estimate the concentration of certain liquids.

Item Type: Conference Item (Paper)
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Journal or Publication Title: NIR, IR, and Photothermal Detection of Explosives
Publisher: SPIE
ISSN: 0277786X
Official Date: 26 April 2011
Dates:
DateEvent
26 April 2011UNSPECIFIED
Volume: Vol. 8018
Page Range: 80181I-80181I
DOI: 10.1117/12.883839
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Conference Paper Type: Paper
Title of Event: Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XII
Type of Event: Conference
Location of Event: Orlando, Florida, USA
Date(s) of Event: 26th April 2011

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