Fiber optic probe for determining heavy metals in solids based on laser-induced plasmas

Brian J. Marquardt; Brian M. Cullum; Tim J. Shaw; S. Michael Angel

doi:10.1117/12.276154

30 May 1997 Fiber optic probe for determining heavy metals in solids based on laser-induced plasmas

Brian J. Marquardt, Brian M. Cullum, Tim J. Shaw, S. Michael Angel

Proceedings Volume 3105, Chemical, Biochemical and Environmental Fiber Sensors IX; (1997) https://doi.org/10.1117/12.276154
Event: Environmental Sensing III, 1997, Munich, Germany

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.

Citation Download Citation

Brian J. Marquardt, Brian M. Cullum, Tim J. Shaw, and S. Michael Angel "Fiber optic probe for determining heavy metals in solids based on laser-induced plasmas", Proc. SPIE 3105, Chemical, Biochemical and Environmental Fiber Sensors IX, (30 May 1997); https://doi.org/10.1117/12.276154

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