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Gallo, Emanuela and Cantu, Luca and Duschek, Frank (2021) REMOTE RAMAN DETECTION OF WARFARE GASSES. ODAS (ONERA-DLR Aerospace Symposium) -MOTAR (Measurement and Optical Techniques for Aerospace Research) 2021, 14-16 June 2021, Paris, France. (Submitted)

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Deep ultraviolet Raman spectroscopy measurements have been performed at the German Aerospace Center (DLR) to detect chlorine gas in a short range remote backscattering configuration. Chlorine gas causes death by asphyxiation at high concentrations (>1000 ppm mortality in few minutes), so the need of a monitoring remote device is necessary to avoid a direct contact with the source of unknown danger. Unwanted chlorine release into the atmosphere can occur as accidental industrial spill, domestic exposure, and warfare agent. Industrially, chlorine gas is often used as an anti-mold agent in dry seeds production (like flour, meat disinfection, etc.); however due to its high commercially availability, its potential for misuse as warfare agent is high since it doesn’t require any further manufacturing effort like mustard gas or phosgene. The final goal of this study is to find the optimal laser excitation wavelength that would maximize the chlorine signal. The best wavelength will be then used to be a part of a first alert and monitoring remote Raman scattering sensor. In this study a remote Raman set up was optimized to detect chlorine gas at a distance of 60 cm. Several ultraviolet laser wavelengths (224, 232, 235 nm respectively, 2.5 mJ/pulse at 10 Hz) were tuned to experimentally observe the highest possible signal to noise ratio. For each tested excitation wavelength, chlorine spectra were successfully detected. Detection limits in acquisition times for a 40% chlorine sample are discussed. In a realistic scenario, released chlorine gas would be simply detected in the atmosphere, so no material interference is expected. Although when performing a test in a closed environment, such a laboratory, any possible chlorine release is unwanted for safety reasons. Discriminating the acquired sample cell signal from the background was challenging since Raman spectral overlapping occurred. In this work a solution to avoid spectral overlapping of the background material with the sample is proposed.

Item URL in elib:https://elib.dlr.de/141624/
Document Type:Conference or Workshop Item (Speech)
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gallo, EmanuelaEmanuela.Gallo (at) dlr.deUNSPECIFIED
Cantu, LucaLuca.Cantu (at) dlr.deUNSPECIFIED
Duschek, FrankFrank.Duschek (at) dlr.deUNSPECIFIED
Date:23 April 2021
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Raman spectroscopy, chlorine gas, warfare agents, remote detection
Event Title:ODAS (ONERA-DLR Aerospace Symposium) -MOTAR (Measurement and Optical Techniques for Aerospace Research) 2021
Event Location:Paris, France
Event Type:international Conference
Event Dates:14-16 June 2021
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Optical remote sensing
Location: Lampoldshausen
Institutes and Institutions:Institute of Technical Physics > Atmospheric Propagation and Effect
Deposited By: Gallo, Ph.D. Emanuela
Deposited On:07 Apr 2021 10:00
Last Modified:07 Apr 2021 10:00

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