Enhanced quantification of wollastonite and calcite in limestone using fluorescence correction based on continuous wavelet transformation for Raman

Kati Laakso*, Lasse Kangas, Heikki Hakkanen, Saara Kaski, Jussi Leveinen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Raman spectroscopy offers a nondestructive means to identify minerals in rocks, but the ability to use the technology for quantitative mineralogical analysis is limited by fluorescence that can mask the spectral features of minerals. In this paper we apply continuous wavelet transformation (CWT) to remove fluoresence from Raman data acquired from 26 carbonate rock samples. We then record the intensity values of individual spectral features, proxies for mineral abundances, using the original Raman data and the thus inferred CWT data. The intensity values are then compared against the known mineral abundances determined using the scanning electron microscope (SEM) technology. This comparison is conducted using a linear regression model to determine whether fluorescence removal enhances the mineral abundance predictions. Our results suggest that CWT enhances the accuracy of mineral abundance estimates, thus highlighting the importance of fluorescence removal when using Raman for quantitative mineralogical analysis.

Original languageEnglish
Pages (from-to)67-84
Number of pages18
JournalAPPLIED SPECTROSCOPY REVIEWS
Volume56
Issue number1
DOIs
Publication statusE-pub ahead of print - 22 Feb 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Raman
  • fluorescence
  • wavelets
  • wollastonite
  • calcite
  • REMOTE RAMAN
  • SPECTROSCOPY
  • IDENTIFICATION
  • LUMINESCENCE
  • EXCITATION
  • DIOPSIDE
  • TOOL

Cite this