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Proceedings Paper

Standoff detection: classification of biological aerosols using laser induced fluorescence (LIF) technique
Author(s): Anita Hausmann; Frank Duschek; Thomas Fischbach; Carsten Pargmann; Valeri Aleksejev; Larisa Poryvkina; Innokenti Sobolev; Sergey Babichenko; Jürgen Handke
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Paper Abstract

The challenges of detecting hazardous biological materials are manifold: Such material has to be discriminated from other substances in various natural surroundings. The detection sensitivity should be extremely high. As living material may reproduce itself, already one single bacterium may represent a high risk. Of course, identification should be quite fast with a low false alarm rate. Up to now, there is no single technique to solve this problem. Point sensors may collect material and identify it, but the problems of fast identification and especially of appropriate positioning of local collectors are sophisticated. On the other hand, laser based standoff detection may instantaneously provide the information of some accidental spillage of material by detecting the generated thin cloud. LIF technique may classify but hardly identify the substance. A solution can be the use of LIF technique in a first step to collect primary data and – if necessary- followed by utilizing these data for an optimized positioning of point sensors. We perform studies on an open air laser test range at distances between 20 and 135 m applying LIF technique to detect and classify aerosols. In order to employ LIF capability, we use a laser source emitting two wavelengths alternatively, 280 and 355 nm, respectively. Moreover, the time dependence of fluorescence spectra is recorded by a gated intensified CCD camera. Signal processing is performed by dedicated software for spectral pattern recognition. The direct comparison of all results leads to a basic classification of the various compounds.

Paper Details

Date Published: 29 May 2014
PDF: 8 pages
Proc. SPIE 9073, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XV, 90730Z (29 May 2014); doi: 10.1117/12.2049923
Show Author Affiliations
Anita Hausmann, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Frank Duschek, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Thomas Fischbach, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Carsten Pargmann, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Valeri Aleksejev, LDI Innovation OÜ (Estonia)
Larisa Poryvkina, LDI Innovation OÜ (Estonia)
Innokenti Sobolev, LDI Innovation OÜ (Estonia)
Sergey Babichenko, LDI Innovation OÜ (Estonia)
Jürgen Handke, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)

Published in SPIE Proceedings Vol. 9073:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XV
Augustus Way Fountain III, Editor(s)

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