Modeling of laser-induced breakdown spectroscopic data analysis by an automatic classifier

Abstract

Laser-induced breakdown spectroscopy (LIBS) is a multi-elemental and real-time analytical technique with simultaneous detection of all the elements in any type of sample matrix including solid, liquid, gas, and aerosol. LIBS produces vast amount of data which contains information on elemental composition of the material among others. Classification and discrimination of spectra produced during the LIBS process are crucial to analyze the elements for both qualitative and quantitative analysis. This work reports the design and modeling of optimal classifier for LIBS data classification and discrimination using the apparatus of statistical theory of detection. We analyzed the noise sources associated during the LIBS process and created a linear model of an echelle spectrograph system. We validated our model based on assumptions through statistical analysis of "dark signal" and laser-induced breakdown spectra from the database of National Institute of Science and Technology. The results obtained from our model suggested that the quadratic classifier provides optimal performance if the spectroscopy signal and noise can be considered Gaussian.

Spectral Data Analysis for Forgery Detection in Official Documents: A Network-Based Approach

“…As excited atoms and ions retreat to lower e ergy levels, they generate distinctive optical light. The detecting and spectral analysis the optical radiation produced by this technique are used to establish the sample's e mental composition dependent on each element's unique emission spectrum (atom emission lines) [22,23]. The LIBS device consists of several main parts [25], and its components and app ratus are as follows:…”