17 September 2009 Evaluation of biological aerosol stand-off detection at a field trial
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Abstract
We have performed a field trial to evaluate technologies for stand-off detection of biological aerosols, both in daytime and at night. Several lidar (light detection and ranging) systems were tested in parallel. We present the results from three different lidar systems; one system for detection and localization of aerosol clouds using elastic backscattering at 1.57 μm, and two systems for detection and classification of aerosol using spectral detection of ultraviolet laser-induced fluorescence (UV LIF) excited at 355 nm. The UV lidar systems were utilizing different technologies for the spectral detection, a photomultiplier tube (PMT) array and an intensified charge-coupled device (ICCD), respectively. During the first week of the field trial, the lidar systems were measuring towards a semi-closed chamber at a distance of 230 m. The chamber was built from two docked standard 20-feet containers with air curtains in the short sides to contain the aerosol inside the chamber. Aerosol was generated inside the semi-closed chamber and monitored by reference equipments, e.g. slit sampler and particle counters. Signatures from several biological warfare agent simulants and interferents were measured at different aerosol concentrations. During the second week the aerosol was released in the air and the reference equipments were located in the centre of the test site. The lidar systems were measuring towards the test site centre at distances of either 230 m or approximately 1 km. In this paper we are presenting results and some preliminary signal processing for discrimination between different types of simulants and interference aerosols.
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Per Jonsson, Per Jonsson, Magnus Elmqvist, Magnus Elmqvist, Ove Gustafsson, Ove Gustafsson, Fredrik Kullander, Fredrik Kullander, Rolf Persson, Rolf Persson, Göran Olofsson, Göran Olofsson, Torbjörn Tjärnhage, Torbjörn Tjärnhage, Øystein Farsund, Øystein Farsund, Trym Vegard Haavardsholm, Trym Vegard Haavardsholm, Gunnar Rustad, Gunnar Rustad, "Evaluation of biological aerosol stand-off detection at a field trial", Proc. SPIE 7484, Optically Based Biological and Chemical Detection for Defence V, 74840I (17 September 2009); doi: 10.1117/12.830401; https://doi.org/10.1117/12.830401
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