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Online discrimination of chemical substances using standoff laser induced fluorescence signals

Kraus, Marian and Gebert, Florian and Pargmann, Carsten and Walter, Arne and Duschek, Frank (2018) Online discrimination of chemical substances using standoff laser induced fluorescence signals. In: INTERNATIONAL CONFERENCE ON CHEMOMETRICS IN ANALYTICAL CHEMISTRY. CHEMOMETRICS IN ANALYTICAL CHEMISTRY, 25.-29. Juni 2018, Halifax, Canada.

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Abstract

Chemical contamination of objects and areas, caused by accident or on purpose, is a common scenario. The immediate countermeasures depend on the class of risk and consequently on the characteristics of the substances. Standoff laser based detection techniques provide this information without direct contact of humans to the hazardous materials. This presentation explains the data acquisition and classification procedure for laser induced fluorescence spectra of several chemical agents. The substances are excited from a distance of 3.5 m by laser pulses of two UV wavelengths (266 and 355 nm) with less than 0.1 mJ and a repetition rate of 100 Hz. Each pair of simultaneously emitted laser pulses is temporally separated by an optical delay line. Every measurement consists of a dataset of 100 spectra per wavelength containing the signal intensities in the spectral range of approximately 250 nm and 680 nm, recorded by a 32 channel photo multiplying tube array. Based on these datasets three classification algorithms are trained which can distinguish the samples by their single spectra with an accuracy of over 95 %. These predictive models, generated with decision trees, support vector machines and neural networks, can identify all agents (e.g. benzaldehyde, isoproturon and piperine) within the current set of substances.

Item URL in elib:https://elib.dlr.de/120934/
Document Type:Conference or Workshop Item (Speech)
Title:Online discrimination of chemical substances using standoff laser induced fluorescence signals
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kraus, MarianMarian.Kraus (at) dlr.deUNSPECIFIED
Gebert, FlorianFlorian.Gebert (at) dlr.deUNSPECIFIED
Pargmann, CarstenCarsten.Pargmann (at) dlr.dehttps://orcid.org/0000-0003-3688-6360
Walter, ArneArne.Walter (at) dlr.deUNSPECIFIED
Duschek, FrankFrank.Duschek (at) dlr.deUNSPECIFIED
Date:26 June 2018
Journal or Publication Title:INTERNATIONAL CONFERENCE ON CHEMOMETRICS IN ANALYTICAL CHEMISTRY
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:standoff identification of chemical agents, classification algorithms, laser induced fluorescence
Event Title:CHEMOMETRICS IN ANALYTICAL CHEMISTRY
Event Location:Halifax, Canada
Event Type:international Conference
Event Dates:25.-29. Juni 2018
Organizer:Dalhousie University
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Optische Fernerkundung für sicherheitsrelevante Anwendungen
Location: Lampoldshausen
Institutes and Institutions:Institute of Technical Physics
Institute of Technical Physics > Atmospheric Propagation and Effect
Deposited By: Kraus, Marian
Deposited On:16 Jul 2018 11:25
Last Modified:31 Jul 2019 20:18

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