CF-LIPS: A new approach to LIPS spectra analysis

Abstract

The usual technique of the laser induced plasma spectroscopy (LIPS) spectra analysis relies on the use of calibration curves for quantitative measurements of plasma composition. However, LIPS calibration curves strongly depend on the material composition (the so-called matrix effect); thus, this standard approach to the LIPS spectra analysis is inadequate when precise information on unknown samples composition is required. In this paper we present a new procedure, based on LIPS, for calibration-free quantitative elemental analysis of materials. The new procedure, based on an algorithm developed and patented by IFAM-CNR, allows the overcoming of the matrix effect, yielding precise and accurate quantitative results without the need of calibration curves.

Application of Laser Induced Breakdown Spectroscopy to the identification of emeralds from different synthetic processes

“…The LIBS spectra, after acquisition and storage, were qualitatively and quantitatively analyzed using a proprietary software (LIBS++), which implements the calibration-free method. Two different methods for quantitative analyses were used for this study: the standard Calibration-Free LIBS (CF-LIBS) method [9] and its recent evolution, the One Point Calibration LIBS (OPC-LIBS) technique [10].…”

“…The analyses were performed detecting at the same time all the elements, also the light ones, in a non-destructive way. In addition, this study aims to compare quantitative analyses obtained by two different methods: the standard Calibration-Free LIBS (CF-LIBS) [9] and its recent evolution, the One Point Calibration LIBS (OPC-LIBS) [10].…”

The development of fieldable laser-induced breakdown spectrometer: No limits on the horizon

“…In addition, LIBS strongly depends on matrix effects, pulse to pulse fluctuations, plasma-solid interactions, etc. To overcome these problems, a new procedure for a calibration-free quantitative analysis (CF-LIBS) has been proposed by Palleschi and coworkers [21]. The method, based on the calculation of the plasma temperature and the electron density in the plasma avoids the use of standard reference materials.…”

“…6 shows a schematic diagram of the set-up used and also a picture of the system. One of the main advantages is that Modì also incorporates the calibration-free method [36] (CF-LBS) for qualitative and quantitative analysis. The system has been satisfactory tested in a broad variety of LIBS applications including cultural heritage analysis, environmental diagnostics and LIBS analysis of precious alloys.…”

Physics of Plasma in Laser-Induced Breakdown Spectroscopy

“…Kim et al [87] studied the spatial distribution of the emission intensity by scanning the direction perpendicular to the target surface and found highest intensity at a distance of 3 mm from the target surface for a time delay of 30 s in air. Liu et al [88] and Ciucci et al [89] studied the early phase of the plasma, and reported a double-peaked intensity distribution along the normal to the irradiated surface. They collected the emission signal from the region, where the maximum intensity was found, avoiding at the same time the region close to the target surface and at the plasma-air interface, where self-absorption was dominant even for non-resonance lines.…”