Advances in quantum cascade lasers for security and crime-fighting
2010
Advances in the application of Quantum Cascade Lasers (QCL) to trace gas detection will be presented. The
solution is real time (~1 μsec per scan), is insensitive to turbulence and vibration, and performs multiple
measurements in one sweep. The QCL provides a large dynamic range, which is a linear response from ppt to
% level. The concentration can be derived with excellent immunity from cross interference. Point sensing
sensors developed by Cascade for home made and commercial explosives operate by monitoring key
constituents in real time and matching this to a spatial event (i.e. sniffer device placed close to an object or
person walking through portal (overt or covert). Programmable signature detection capability allows for
detection of multiple chemical compounds along the most likely array of explosive chemical formulation.
The advantages of configuration as "point sensing" or "stand off" will be discussed. In addition to explosives
this method is highly applicable to the detection of mobile drugs labs through volatile chemical release.
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