Stand-off detection at the DLR laser test range applying laser-induced breakdown spectroscopy

Frank Duschek; Carsten Pargmann; Karin Grünewald; Jürgen Handke

doi:10.1117/12.864440

12 October 2010 Stand-off detection at the DLR laser test range applying laser-induced breakdown spectroscopy

Frank Duschek, Carsten Pargmann, Karin Grünewald, Jürgen Handke

Proceedings Volume 7838, Optics and Photonics for Counterterrorism and Crime Fighting VI and Optical Materials in Defence Systems Technology VII; 78380I (2010) https://doi.org/10.1117/12.864440
Event: SPIE Security + Defence, 2010, Toulouse, France

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 standoff detection systems for 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 setup and first LIBS spectra of selected samples are presented. A Nd:YAG laser beam was focused 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 lines. 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 distance to the target substance.

Citation Download Citation

Frank Duschek, Carsten Pargmann, Karin Grünewald, and Jürgen Handke "Stand-off detection at the DLR laser test range applying laser-induced breakdown spectroscopy", Proc. SPIE 7838, Optics and Photonics for Counterterrorism and Crime Fighting VI and Optical Materials in Defence Systems Technology VII, 78380I (12 October 2010); https://doi.org/10.1117/12.864440

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