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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 20 — Jul. 10, 2012
  • pp: 4612–4621

Quantitative elemental analysis of steel using calibration-free laser-induced breakdown spectroscopy

M. L. Shah, A. K. Pulhani, G. P. Gupta, and B. M. Suri  »View Author Affiliations

Applied Optics, Vol. 51, Issue 20, pp. 4612-4621 (2012)

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We report the quantitative elemental analysis of a steel sample using calibration-free laser-induced breakdown spectroscopy (CF-LIBS). A Q-switched Nd:YAG laser (532 nm wavelength) is used to produce a plasma by focusing it onto a steel sample in air at atmospheric pressure. The time-resolved spectra from atomic and ionic emission lines of the steel elements are recorded by an echelle grating spectrograph coupled with a gated intensified CCD camera and are used for the plasma characterization and quantitative analysis of the sample. The time delay at which the plasma is in local thermodynamic equilibrium as well as optically thin, necessary for elemental analysis, is deduced. An algorithm for the CF-LIBS relating the experimentally measured spectral intensity values with the basic physics of the plasma is developed and used for the determination of Fe, Cr, Ni, Mg, and Si concentrations in the steel sample. The analytical results obtained from the CF-LIBS technique agree well with the certified values of the elements in the sample, with relative uncertainties of less than 5%.

© 2012 Optical Society of America

OCIS Codes
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(140.3440) Lasers and laser optics : Laser-induced breakdown
(300.2140) Spectroscopy : Emission
(300.6210) Spectroscopy : Spectroscopy, atomic
(300.6365) Spectroscopy : Spectroscopy, laser induced breakdown

ToC Category:
Lasers and Laser Optics

Original Manuscript: February 6, 2012
Revised Manuscript: April 20, 2012
Manuscript Accepted: May 15, 2012
Published: July 2, 2012

M. L. Shah, A. K. Pulhani, G. P. Gupta, and B. M. Suri, "Quantitative elemental analysis of steel using calibration-free laser-induced breakdown spectroscopy," Appl. Opt. 51, 4612-4621 (2012)

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