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 laser. A set of steel samples with P concentrations from 3.9 to were analyzed using LIBS-LIF at wavelengths of 253.40 and for resonant excitation of P atoms and fluorescence lines at wavelengths of 213.55 and . The calibration curves were measured to determine the limit of detection for P in steel, which is estimated to be around . 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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