Improvements in Quantitative Analysis of Steel Composition by Laser-Induced Breakdown Spectroscopy at Atmospheric Pressure Using an Infrared Nd:YAG Laser

Abstract

The experimental conditions and procedure for quantitative analysis of steel by laser-induced breakdown spectroscopy in argon at atmospheric pressure using an infrared Nd:YAG laser have been studied. Satisfactory analytical results have been obtained for the determination of C, Si, Cr, and Ni contents in low-alloyed steels. The lens-to-sample distance is shown to be a relevant parameter, which can be selected at each pulse energy to enhance the line intensities and the repeatability of measurements. A higher precision has been obtained for line-intensity ratios (0.9–2.5% relative standard deviation for concentrations higher than 0.1%) than for absolute intensity measurements. The calibration curves for all the elements have correlation coefficients above 0.999. Detection limits are in the range 6–80 ppm.

Homogeneity testing and quantitative analysis of manganese (Mn) in vitrified Mn-doped glasses by laser-induced breakdown spectroscopy (LIBS)

“…[11][12][13][14] Many groups around the globe are working on LIBS quantitative elemental analysis using calibration curve method. [15][16][17][18][19][20] For this, generally, a calibration curve prepared by using the emission line intensity of the analyte material versus its concentration is used. The curves are constructed using known standard elemental concentrations in a matrix matching the sample.…”

“…Mao et al, 16 Aguilera et al 17 and Aragon et al 18 reported that the experimental conditions which can affect the analytical performance need to be optimized carefully for meaningful quantitative results from the linear calibration curve. Based on the purpose for which LIBS is to be used, one needs to make a judicious choice of the spectrograph, detectors and collection/excitation optics.…”

Correction of self-absorption effect in calibration-free laser-induced breakdown spectroscopy by an internal reference method

“…In order to correct the matrix effect on the calibration curves, a number of methods have been proposed [15][16][17]. The procedure based on normalization with respect to a reference line can provide higher accuracy and reproducibility of the analytical results than methods using simple line intensity [15].…”

“…The procedure based on normalization with respect to a reference line can provide higher accuracy and reproducibility of the analytical results than methods using simple line intensity [15]. Panne et al propose a model which includes the equilibrium Saha and Boltzmann relationships to correct the pulse-to-pulse variability of the plasma electron temperature and density [16].…”

Többimpulzusos lézer indukált plazmák jellemzése és atomspektroszkópiai alkalmazása

“…Számos tanulmány felhívta rá a figyelmet, hogy a plazma fényének térbeli integrálása a jel reprodukálhatósága szempontjából elınyös [pl. 33,36,37], ezért az egy győjtılencsés megoldások sokszor jobb eredmé-nyeket produkálnak, mint a két vagy több győjtılencsés (a plazmát pontszerő objektumként leképezı, képalkotáshoz megfelelı) megoldások.…”