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Stand-off Detection at the DLR Laser Test Range Applying Laser-Induced Breakdown Spectroscopy

Duschek, Frank and Pargmann, Carsten and Handke, Jürgen (2010) Stand-off Detection at the DLR Laser Test Range Applying Laser-Induced Breakdown Spectroscopy. Security & Defence, 20.-23- Sep. 2010, Toulouse, Frankreich.

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Abstract

The DLR laser test range at Lampoldshausen allows for optical measurements under daylight conditions at distances up to 130 m. This infrastructure is very suitable for the development of stand-off detection systems of biological, chemical and explosive hazardous substances. In a first step, laser-induced breakdown spectroscopy (LIBS) has been introduced to this test site. A basic LIBS set-up and first LIBS spectra of selected samples are presented. A Nd:YAG laser beam was focussed by a Cassegrain type telescope onto different samples at distances exceeding 50 m. The light of the generated plasma plume was collected by a Newtonian telescope, and analyzed by a gated broadband CCD-spectrometer system. The Nd:YAG laser yields pulse energies up to 800 mJ at a wavelength of 1064 nm and a pulse width of 8 ns. Optionally the second and third harmonics can be extracted. LIBS spectra from 10 nm layers of gold on a silicon wafer were recorded. In addition, LIBS spectra from black powder were measured, and compared to the spectrum of potassium nitrate, which is a main component of black powder and shows very characteristic emission. LIBS spectra of the above samples have also been acquired with an excitation laser wavelength in the eye-safe region. Recorded spectra are measured as a function of the laser wavelength, pulse energy, and energy density on the target and are compared to the literature.

Document Type:Conference or Workshop Item (Speech)
Title:Stand-off Detection at the DLR Laser Test Range Applying Laser-Induced Breakdown Spectroscopy
Authors:
AuthorsInstitution or Email of Authors
Duschek, FrankFrank.Duschek@dlr.de
Pargmann, CarstenCarsten.Pargmann@dlr.de
Handke, JürgenJuergen.Handke@dlr.de
Date:2010
Status:Accepted
Keywords:stand-off detection, laser-induced breakdown spectroscopy, LIBS, hazardous substances, warfare agents
Event Title:Security & Defence
Event Location:Toulouse, Frankreich
Event Type:international Conference
Event Dates:20.-23- Sep. 2010
Organizer:SPIE
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignement
DLR - Research theme (Project):L - Laser Research and Technology
Location: Lampoldshausen
Institutes and Institutions:Institute of Technical Physics
Deposited By: Dr.rer.nat. Frank Duschek
Deposited On:22 Mar 2010 11:53
Last Modified:06 Jul 2010 15:37

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