We have developed a small, relatively lightweight and efficient short range (<100 m) LIDAR instrument for remotely
detecting harmful bioagents. The system is based on a pulsed, eye-safe, 355 nm laser exciting aerosols which then
fluoresce with a typical spectrum. The system makes use of a novel technology for continuously monitoring for the
presence of unusual concentrations of bioaerosols at a precise remote location within the monitored area, with response
within seconds. Fluorescence is spectrally resolved over 32 channels capable of photon counting. Results show a
sensitivity level of 40 ACPLA of Bacillus Globigii, an anthrax simulant, at a distance of 100 m (assumed worst case
where 1 ppl = 1 ACPLA) considering particle sizes between 0.5 and 10 μm, with a geometric mean at 1 um. The
apparatus has been tested in the field during three test and evaluation campaigns with multiple bioagents and public
security products. Preliminary results show that the system is able to distinguish between harmful bioagents and
naturally occurring ones. A classification algorithm was successfully tested with a single type of bioagent; experiments
for daytime measurements are discussed.
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