Abstract

Monitoring of light-element concentration in steel is very important for quality assurance in the steel industry. In this work, detection in open air of trace phosphorus (P) in steel using laser-induced breakdown spectroscopy (LIBS) combined with laser-induced fluorescence (LIF) has been investigated. An optical parametric oscillator wavelength-tunable laser was used to resonantly excite the P atoms within plasma plumes generated by a Q-switched Nd:YAG laser. A set of steel samples with P concentrations from 3.9 to 720partsin106(ppm) were analyzed using LIBS-LIF at wavelengths of 253.40 and 253.56nm for resonant excitation of P atoms and fluorescence lines at wavelengths of 213.55 and 213.62nm. The calibration curves were measured to determine the limit of detection for P in steel, which is estimated to be around 0.7ppm. The results demonstrate the potential of LIBS-LIF to meet the requirements for on-line analyses in open air in the steel industry.

© 2009 Optical Society of America

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