An automatic detection software for differential reflection spectroscopy
2012
Recent terrorist attacks have sprung a need for a large scale explosive detector. Our group has developed
differential reflection spectroscopy which can detect explosive residue on surfaces such as parcel, cargo and
luggage. In short, broad band ultra-violet and visible light is shone onto a material (such as a parcel) moving on
a conveyor belt. Upon reflection off the surface, the light intensity is recorded with a spectrograph (spectrometer
in combination with a CCD camera). This reflected light intensity is then subtracted and normalized with
the next data point collected, resulting in differential reflection spectra in the 200-500 nm range. Explosives
show spectral finger-prints at specific wavelengths, for example, the spectrum of 2,4,6, trinitrotoluene (TNT)
shows an absorption edge at 420 nm. Additionally, we have developed an automated software which detects the
characteristic features of explosives. One of the biggest challenges for the algorithm is to reach a practical limit
of detection. In this study, we introduce our automatic detection software which is a combination of principal
component analysis and support vector machines. Finally we present the sensitivity and selectivity response of
our algorithm as a function of the amount of explosive detected on a given surface.
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