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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 1    January 2008

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Quantitative analysis of impurities in aluminum alloys by laser-induced breakdown spectroscopy without internal calibration
LI Hong-kun(黎洪坤), LIU Ming(刘 明), CHEN Zhi-jiang(陈志江), LI Run-hua(李润华)

School of Physics, South China University of Technology, Guangzhou 510640, China

Abstract:To develop a fast and sensitive alloy elemental analysis method, a laser-induced breakdown spectroscopy(LIBS) system was established and used to carry out quantitative analysis of impurities in aluminum alloys in air at atmospheric pressure. A digital storage oscilloscope was used as signal recording instrument, instead of traditional gate integrator or Boxcar averager, to reduce the cost of the whole system. Linear calibration curves in the concentration range of 4×10−5−10−2 are built for Mg, Cr, Mn, Cu and Zn using absolute line intensity without internal calibrations. Limits of detection for these five elements in aluminum alloy are determined to be (2−90)×10−6. It is demonstrated that LIBS can provide quantitative trace elemental analysis in alloys even without internal calibration. This approach is easy to use in metallurgy industries and relative research fields.

 

Key words: laser-induced breakdown spectroscopy; aluminum alloy; impurity analysis

ISSN 1672-7029
CN 43-1423/U

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