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Laser-induced plasma spectroscopy for mine detection and verification

Published online by Cambridge University Press:  08 June 2006

WOLFGANG SCHADE,
CHRISTIAN BOHLING,
KONRAD HOHMANN and
DIRK SCHEEL
WOLFGANG SCHADE
Affiliation:
Technische Universität Clausthal, Institut für Physik und Physikalische Technologien, Clausthal, Germany
CHRISTIAN BOHLING
Affiliation:
Technische Universität Clausthal, Institut für Physik und Physikalische Technologien, Clausthal, Germany
KONRAD HOHMANN
Affiliation:
Technische Universität Clausthal, Institut für Physik und Physikalische Technologien, Clausthal, Germany
DIRK SCHEEL
Affiliation:
Technische Universität Clausthal, Institut für Physik und Physikalische Technologien, Clausthal, Germany
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Abstract

Laser-induced breakdown spectroscopy (LIBS) in combination with a conventional mine prodder is applied for remote detection of explosives and mine housing materials. High power subnanosecond laser pulses (pulse power Ep = 0.6 mJ and pulse duration Δt = 650 ps) at 1064 nm with a typical repetition rate of 10 kHz are generated by using a passively Q-switched Cr4+:Nd3+:YAG microchip-laser as seed-laser for an Yb-fiber amplifier. In the present investigation, the ratios of “late” and “early” LIBS intensities for the cyanide (CN) plasma emission at 388 nm and for the C-emission at 248 nm are used for data analysis. This allows the classification of different explosives and mine casing materials under real time conditions and also similar applications to materials processing.

Keywords

ExplosivesFiber laserLaser spectroscopyLIBSMines

Information

Type
Research Article
Information
Laser and Particle Beams , Volume 24 , Issue 2 , June 2006, pp. 241 - 247
Copyright
© 2006 Cambridge University Press

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References

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