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Proceedings Paper

TATP stand-off detection with open path: FTIR techniques
Author(s): C. Fischer; T. Pohl; K. Weber; A. Vogel; G. van Haren; W. Schweikert
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Paper Abstract

TATP is a very easy to synthesize [9], sensitive, high explosive [10] and high volatile explosive [1, 3, 7] with great absorption in the IR Spectra [4, 5, 6]. In this project we detect TATP gas traces with open path FTIR – techniques. The first project phase was to construct and build a heatable multi-reflection cell with adjustable optical path length and a heatable intake to evaporate solid TATP samples. In this cell reference TATP - spectra were collected under controlled conditions with a Bruker FTIR system (Typ OPAG 33). The next step was to find out how the TATP gas will be diluted in the ambient air and validate some physical properties which are described inconsistently in literature e.g. evaporation rates. We constructed a special double - T shaped chamber with stabile air conditions. In this chamber the dispersion kinetics of the TATP vapour could be tested. It turned out that the TATP vapours has the tendency to drop down. Therefore the highest TATP - concentrations were measured below the TATP sample. During the investigation for this study it turned out, that some materials scrub the TATP- vapour out of the air, e.g. Metals, fabric, leather. In the second phase of the project successful open path FTIR- measurements were taken in ambient air and will be continued with different system configurations of the OPAG 33 to lower the detection limits. Also successful measurements were taken in indoor ambient air with a Hyper spectral camera (passive FTIR with array sensor) to detect TATP in solid and gaseous phase. This technique allows detecting TATP and identifying the TATP source. The poster shows some selected results of the continued research.

Paper Details

Date Published: 30 October 2012
PDF: 7 pages
Proc. SPIE 8546, Optics and Photonics for Counterterrorism, Crime Fighting, and Defence VIII, 85460Y (30 October 2012); doi: 10.1117/12.974592
Show Author Affiliations
C. Fischer, Fachhochschule Düsseldorf (Germany)
T. Pohl, Fachhochschule Düsseldorf (Germany)
K. Weber, Fachhochschule Düsseldorf (Germany)
A. Vogel, Fachhochschule Düsseldorf (Germany)
G. van Haren, Fachhochschule Düsseldorf (Germany)
W. Schweikert, Fraunhofer-Institut für Chemische Technologie (Germany)

Published in SPIE Proceedings Vol. 8546:
Optics and Photonics for Counterterrorism, Crime Fighting, and Defence VIII
Colin Lewis; Douglas Burgess, Editor(s)

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