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Proceedings Paper

Fiber optic probe for determining heavy metals in solids based on laser-induced plasmas
Author(s): Brian J. Marquardt; Brian M. Cullum; Tim J. Shaw; S. Michael Angel
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Paper Abstract

A fiber-optic probe suitable for remote elemental analysis using laser-induced breakdown spectroscopy (LIBS) has been developed and has been used to determine the concentration of lead in samples of dry paint. To develop a suitable fiber- optic sensor for remote measurements using LIBS a number of key issues must be addressed. The issue of coupling high-power laser pulses into optical fibers without fiber damage was first addressed by measuring damage threshold values, and by performing long-term durability tests for several different fiber types and sizes. This study led to the design of a highly flexible fiber-optic LIBS probe that can be used for a variety of sample substrates. To address the issue of reproducibility, we are investigating matrix affects and the dynamics of the laser ablation and laser-induced plasma processes by using a variety of spectroscopic techniques including time-resolved spectroscopic imaging. We have also modified the probe so that laser ablated material can be injected into a mass spectrometer.

Paper Details

Date Published: 30 May 1997
PDF: 10 pages
Proc. SPIE 3105, Chemical, Biochemical and Environmental Fiber Sensors IX, (30 May 1997); doi: 10.1117/12.276154
Show Author Affiliations
Brian J. Marquardt, University of South Carolina (United States)
Brian M. Cullum, University of South Carolina (United States)
Tim J. Shaw, University of South Carolina (United States)
S. Michael Angel, University of South Carolina (United States)

Published in SPIE Proceedings Vol. 3105:
Chemical, Biochemical and Environmental Fiber Sensors IX
Robert A. Lieberman, Editor(s)

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