A Method for Resolving Overlapped Peaks in Laser-Induced Breakdown Spectroscopy (LIBS)

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Spectral peak overlapping is a basic problem in analytical data processing of laser-induced breakdown spectroscopy (LIBS). Curve fitting is the typical method of resolving overlapped peaks. For preventing ambiguous fitting, appropriate initial values must be known. The aim of this work was to present a method that could be used to determine appropriate initial values of the curve-fitting method by using fractional differential theory. According to the variation of characteristic points of Lorentzian peaks at different fractional differential orders, parameter estimators were obtained that were used to calculate the initial values of the curve-fitting method. As it is a widely used optimization method, the Levenberg‐Marquardt method was used in curve fitting. Simulation and LIBS experimental results proved that the proposed method of the initial value estimation can effectively resolve the overlapped peaks in LIBS data processing.

Keywords: Curve fitting; Fractional differential; LIBS; LIBS data processing; Laser-induced breakdown spectroscopy; Overlapped peaks

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/12-06822

Affiliations: Key Laboratory of Industrial Informatics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China

Publication date: September 1, 2013

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