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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 7 — Mar. 1, 2012
  • pp: B171–B175

Helium detection in gas mixtures by laser-induced breakdown spectroscopy

Kemal E. Eseller, Fang-Yu Yueh, Jagdish P. Singh, and Noureddine Melikechi  »View Author Affiliations


Applied Optics, Vol. 51, Issue 7, pp. B171-B175 (2012)
http://dx.doi.org/10.1364/AO.51.00B171


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Abstract

Laser-induced breakdown spectroscopy (LIBS) has been evaluated as a tool for monitoring trace levels of helium in gas mixtures consisting mostly of hydrogen. Calibration data for helium in hydrogen was investigated at different helium concentration levels. At high concentrations of helium (>7.25%), the LIBS signal is quenched due to Penning ionization. The hydrogen alpha line (656.28 nm) was observed to broaden as the concentration of helium impurities in the hydrogen gas mixture increased. The helium line at 587.56 nm was selected as the analyte line for helium impurity detection. The effects of laser energy, the delay time between the laser pulse and data acquisition, and the gas pressure on the LIBS signal of helium were investigated to determine the optimum conditions for helium detection. The LIBS signal from the helium line at 587.56 nm shows good linear correlation with helium concentration for He concentrations below 1%. Thus, LIBS can be reliably used to detect the low levels of helium. The limit of detection for helium was found to be 78 ppm.

© 2012 Optical Society of America

OCIS Codes
(140.3440) Lasers and laser optics : Laser-induced breakdown
(300.0300) Spectroscopy : Spectroscopy
(300.6210) Spectroscopy : Spectroscopy, atomic
(300.6365) Spectroscopy : Spectroscopy, laser induced breakdown

History
Original Manuscript: October 11, 2011
Revised Manuscript: January 27, 2012
Manuscript Accepted: February 15, 2012
Published: March 1, 2012

Citation
Kemal E. Eseller, Fang-Yu Yueh, Jagdish P. Singh, and Noureddine Melikechi, "Helium detection in gas mixtures by laser-induced breakdown spectroscopy," Appl. Opt. 51, B171-B175 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-7-B171

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