Publikationsdatum:
2017-01-02
Beschreibung:
In this work, we demonstrate for the first time the feasibility of stand-off laser induced breakdown
spectroscopy (ST-LIBS) for the analysis of distant submerged objects. The applicability of underwater
stand-off LIBS is highly challenging since it involves the delivery of a focused laser pulse toward the
distant target through the aqueous media and then the transmission of the light emitted by the laserinduced
plasma back to the detection system. Experiments were designed to gain fundamental
knowledge regarding LIBS analysis in an underwater open-path configuration. Samples were analyzed at
distances up to 80 cm from the sensor at a solid–water interface. Effective plasma formation was
achieved using dual pulse excitation with Nd:YAG laser pulses at 532 nm. Intense and well resolved
emission signals were observed with interpulse delay times close to 500 ms, whereas the lifetime of the
laser-induced plasma was only a few ms. The effect of water temperature and the influence of the
underwater optical path on the LIBS signal have also been evaluated.
Materialart:
Article
,
PeerReviewed
Format:
text
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