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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: B65–B73

Advanced signal processing analysis of laser-induced breakdown spectroscopy data for the discrimination of obsidian sources

Jeremiah J. Remus, Russell S. Harmon, Richard R. Hark, Gregory Haverstock, Dirk Baron, Ian K. Potter, Samantha K. Bristol, and Lucille J. East  »View Author Affiliations


Applied Optics, Vol. 51, Issue 7, pp. B65-B73 (2012)
http://dx.doi.org/10.1364/AO.51.000B65


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Abstract

Obsidian is a natural glass of volcanic origin and a primary resource used by indigenous peoples across North America for making tools. Geochemical studies of obsidian enhance understanding of artifact production and procurement and remain a priority activity within the archaeological community. Laser-induced breakdown spectroscopy (LIBS) is an analytical technique being examined as a means for identifying obsidian from different sources on the basis of its ‘geochemical fingerprint’. This study tested whether two major California obsidian centers could be distinguished from other obsidian localities and the extent to which subsources could be recognized within each of these centers. LIBS data sets were collected in two different spectral bands (350±130nm and 690±115nm) using a Nd:YAG 1064 nm laser operated at 23mJ, a Czerny–Turner spectrograph with 0.2–0.3 nm spectral resolution and a high performance imaging charge couple device (ICCD) detector. Classification of the samples was performed using partial least-squares discriminant analysis (PLSDA), a common chemometric technique for performing statistical regression on high-dimensional data. Discrimination of samples from the Coso Volcanic Field, Bodie Hills, and other major obsidian areas in north-central California was possible with an accuracy of greater than 90% using either spectral band.

© 2012 Optical Society of America

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

History
Original Manuscript: October 17, 2011
Manuscript Accepted: December 9, 2011
Published: February 9, 2012

Citation
Jeremiah J. Remus, Russell S. Harmon, Richard R. Hark, Gregory Haverstock, Dirk Baron, Ian K. Potter, Samantha K. Bristol, and Lucille J. East, "Advanced signal processing analysis of laser-induced breakdown spectroscopy data for the discrimination of obsidian sources," Appl. Opt. 51, B65-B73 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-7-B65


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