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Proceedings Paper

Detection and monitoring of CWA and BWA using LIBS
Author(s): L. Landström; A. Larsson; P.-Å. Gradmark; L. Örebrand; P. O. Andersson; Pär Wästerby; Torbjörn Tjärnhage
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Paper Abstract

Results related to laser induced breakdown spectroscopy (LIBS) as an analytical tool for applications regarding CWA and BWA detection/monitoring will be presented and discussed in this paper. A ‘real-time’ aerosol analysis set-up using LIBS on single μm-sized particles (sampled from ambient air into a particle stream) has been developed and evaluated. Here, a two-stage triggering unit ensures a high hit-rate of the sampled aerosol particles and the optical emission from the laser induced plasma is collected and coupled into an echelle spectrometer equipped with an intensified CCD detector. Each CCD image (echellogram), optimally originating from a single μm-sized particle, is then analyzed and the result treated by an alarm algorithm built from a database using multivariate data analysis. The database signatures of simulant agents and interferents were obtained in controlled atmospheres (aerosol chamber/wind tunnel) as well as from measurements in different ambient background. The LIBS bioaerosol system with alarm algorithm was also tested in ‘real-life’ settings (subway station) during simulant dispersions. Painted surfaces have also been analyzed by LIBS to obtain information about residues of organophosphates on, or within, the paint. Depth analysis has been performed, which illustrated the possibility to monitor diffusion and penetration behavior of neat CWAs and simulant chemicals in the paint layer by following the intensity of phosphorous emission lines in single shot LIBS spectra as function of number of laser pulses. In addition, LIBS analysis was also performed after simple ethanol decontamination procedures, after which P emission lines still could be observed. The possibilities and challenges associated with the different set-ups and applications will be briefly discussed in connection with the presented results.

Paper Details

Date Published: 29 May 2014
PDF: 6 pages
Proc. SPIE 9073, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XV, 907312 (29 May 2014); doi: 10.1117/12.2050271
Show Author Affiliations
L. Landström, Swedish Defence Research Agency (Sweden)
A. Larsson, Swedish Defence Research Agency (Sweden)
P.-Å. Gradmark, Swedish Defence Research Agency (Sweden)
L. Örebrand, Swedish Defence Research Agency (Sweden)
P. O. Andersson, Swedish Defence Research Agency (Sweden)
Pär Wästerby, Swedish Defence Research Agency (Sweden)
Torbjörn Tjärnhage, Swedish Defence Research Agency (Sweden)

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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