A compact LIBS system for industrial applications
2015
In recent years, laser-induced breakdown spectroscopy (LIBS) has been established as a promising analytical tool for online
chemical analysis. The emitted light spectrum is analyzed for instantaneous determination of the elemental
composition of the sample, enabling on-line classification of materials. Two major strengths of the technique are the
possibilities to perform both fast and remote chemical analysis to determine the elemental composition of the samples
under test. In order to reduce the size of LIBS systems, the use of a compact Q-switched diode-pumped solid-state laser
(DPSSL) in a LIBS system is evaluated for the industrial sorting of aluminium alloys. The DPSSL, which delivers 150μJ
pulses of high beam quality at more than 7KHz repetition rate, provides irradiance on the target that is appropriate for
LIBS measurements.
The experimental results indicate that alloy classification and quantitative analysis are possible on scrap aluminium
samples placed 50 cm apart from the focusing and collecting lenses, without sample preparation. Similar calibration
curves and limits of detection are obtained for traditional high-energy low-frequency flashlamp-pumped and low-energy
high-frequency diode-pumped lasers, showing the applicability of compact diode-pumped lasers for industrial LIBS
applications.
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