In recent years, quantum cascade lasers (QCL) have been proven in robust, high-performance gas analyzers designed for
continuous emission monitoring (CEM) in harsh environments. In 2006, Cascade Technologies reported progress
towards adapting its patented technology for homeland security applications by publishing initial results on explosive
compound detection. This paper presents the performance and results from a QCL-based people screening portal
developed during the past year and aimed at the detection of precursors used in the make up of improvised explosive
devices (IED). System tests have been carried out on a large number of potential interferents, together with target
precursor materials, reinforcing original assumptions that compound fingerprinting can be effectively demonstrated
using this technique. Results have shown that an extremely high degree of specificity can be achieved with a sub-second
response time. Furthermore, it has been shown that unambiguous precursor signature recognition can be extended to
compound mixtures associated with the intermediate stages in the make up of IEDs, whilst maintaining interferent
immunity. The portal sensitivity was configured for parts per billion (ppb) detection level thresholds, but is currently
being reconfigured for sub-ppb detection. In summary, the results obtained from the QCL based portal indicate that
development of a low cost detection system, with enhanced features such as low false positive and high throughput
screening of individuals or items, is possible. Development and testing was carried out with the support of the UK
government.
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