scholarly journals Integrated Laser-Induced Breakdown Spectroscopy (LIBS) and Multivariate Wavelet Tessellation: A New, Rapid Approach for Lithogeochemical Analysis and Interpretation

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 312
Author(s):  
Fernando F. Fontana ◽  
Steven Tassios ◽  
Jessica Stromberg ◽  
Caroline Tiddy ◽  
Ben van der Hoek ◽  
...  
Keyword(s):  
Rock Block ◽  
Coarse Grained ◽  
Geochemical Data ◽  
Laser Induced Breakdown Spectroscopy ◽  
Small Scale ◽  
Breakdown Spectroscopy ◽  
Novel Approach ◽  
Laser Induced Breakdown ◽  
Mineral Compositions ◽  
Plutonic Rocks

This paper demonstrates a novel approach that uses wavelet tessellation in rapid analysis of raw geochemical data produced by laser-induced breakdown spectroscopy (LIBS) to produce pseudologs that are representative of stratigraphy. Single-line LIBS spectral data for seven major rock-forming elements (Al, Ca, Fe, Mg, Si, Na and K) were collected from a synthetic 22-sample rock-block comprising two distinct lithological groups based on mineralogy, chemistry and texture: plutonic rocks and marble. Seven sublithologies are identified within the rock-block from traditional laboratory whole-rock geochemical analysis: marble, Mg-marble, granite, quartz monzonite, foidolite, granodiorite and gabbroic diorite. Two-domain clustering (k = 2) on raw spectral LIBS data combined with wavelet tessellation was applied to generate a simplified lithological stratigraphy of marble and plutonic rocks and generate a pseudolog identical to the rock-block stratigraphy. A pseudolog generated from seven-domain clustering (k = 7) and wavelet tessellation successfully discriminated most sublithologies within the rock-block slabs, especially marble slabs. Small-scale units were identified within the more mineralogically and geochemically complex plutonic slabs. The spatial resolution of the LIBS analysis, with a measurement spacing of ~0.35 mm, allowed for assessment of individual mineral compositions and rock textures, and small-scale units within the plutonic rocks can be correlated to specific coarse-grained minerals or mineralogical associations. The application of the wavelet tessellation method to raw LIBS geochemical data offers the possibility of rapid and objective lithogeochemical analysis and interpretations which can predate further analysis (quantitative) and supplement geological logging.

scholarly journals Laser-Induced Breakdown Spectroscopy—An Emerging Analytical Tool for Mineral Exploration

Minerals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 718 ◽  
Author(s):  
Russell Harmon ◽  
Christopher Lawley ◽  
Jordan Watts ◽  
Cassady Harraden ◽  
Andrew Somers ◽  
...  
Keyword(s):  
Mineral Exploration ◽  
Grain Size Analysis ◽  
Geochemical Data ◽  
Laser Induced Breakdown Spectroscopy ◽  
Size Analysis ◽  
Green Technologies ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Rock Characterization

The mineral exploration industry requires new methods and tools to address the challenges of declining mineral reserves and increasing discovery costs. Laser-induced breakdown spectroscopy (LIBS) represents an emerging geochemical tool for mineral exploration that can provide rapid, in situ, compositional analysis and high-resolution imaging in both laboratory and field and settings. We demonstrate through a review of previously published research and our new results how LIBS can be applied to qualitative element detection for geochemical fingerprinting, sample classification, and discrimination, as well as quantitative geochemical analysis, rock characterization by grain size analysis, and in situ geochemical imaging. LIBS can detect elements with low atomic number (i.e., light elements), some of which are important pathfinder elements for mineral exploration and/or are classified as critical commodities for emerging green technologies. LIBS data can be acquired in situ, facilitating the interpretation of geochemical data in a mineralogical context, which is important for unraveling the complex geological history of most ore systems. LIBS technology is available as a handheld analyzer, thus providing a field capability to acquire low-cost geochemical analyses in real time. As a consequence, LIBS has wide potential to be utilized in mineral exploration, prospect evaluation, and deposit exploitation quality control. LIBS is ideally suited for field exploration programs that would benefit from rapid chemical analysis under ambient environmental conditions.

A novel approach for the quantitative analysis of multiple elements in steel based on laser-induced breakdown spectroscopy (LIBS) and random forest regression (RFR)

2014 ◽  
Vol 29 (12) ◽  
pp. 2323-2329 ◽  
Author(s):  
Tianlong Zhang ◽  
Long Liang ◽  
Kang Wang ◽  
Hongsheng Tang ◽  
Xiaofeng Yang ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Random Forest ◽  
Laser Induced Breakdown Spectroscopy ◽  
Random Forest Regression ◽  
Breakdown Spectroscopy ◽  
Novel Approach ◽  
Laser Induced Breakdown

LIBS combined with random forest regression (RFR) was proposed for the quantitative analysis of multiple elements in fourteen steel samples.

scholarly journals Species discrimination of terrestrial processed animal proteins by laser-induced breakdown spectroscopy (LIBS) based on elemental characteristics

2019 ◽  
pp. 137-146
Author(s):  
Mengyan Wang ◽  
Lujia Han ◽  
Zengling Yang ◽  
Xian Liu
Keyword(s):  
Discriminant Analysis ◽  
Elemental Composition ◽  
Spectral Characteristics ◽  
High Sensitivity ◽  
Laser Induced Breakdown Spectroscopy ◽  
Species Discrimination ◽  
Breakdown Spectroscopy ◽  
Novel Approach ◽  
Laser Induced Breakdown ◽  
Bone Fraction

Description of the subject. This research presents a novel approach for species discrimination of terrestrial processed animal proteins (PAP) using laser-induced breakdown spectroscopy (LIBS) as an alternative technique for determining feed safety. Objectives. To explore the correlation between LIBS results and elemental composition. To assess the potential of LIBS spectroscopic methods for species discrimination of terrestrial PAP. Method. A total of 42 reliable terrestrial PAP samples of ovine, bovine, porcine, and poultry origin were analyzed and LIBS spectra were innovatively collected from the separated bone fraction. Partial least squares-discriminant analysis (PLS-DA) models were performed on the dataset. Results. Significant differences were found in the element compositions (carbon, nitrogen, hydrogen, calcium, sodium, potassium, magnesium, zinc, strontium and barium, p < 0.05) of PAP from different sources, which indicated a high potential for species discrimination. High-marked LIBS spectral characteristics (21 variables) related to six elements (calcium, sodium, magnesium, zinc, strontium and barium) for different species of terrestrial PAP samples were found out. PAP from the four tested species could be well classified with high sensitivity and specificity (> 0.90), while the ruminant and non-ruminant PAP could be thoroughly discriminated. For the discriminant analysis of ruminant-derived components in terrestrial PAPs, the detection of 10%-40% adulteration can be achieved and the correct rate is about 95%. Conclusions. This study demonstrates that LIBS can mostly exhibit the elemental composition of different terrestrial PAP, and can be a promising method for discriminating the different animal species or animal groups (ruminant/non-ruminant) involved in terrestrial PAPs.

A novel approach for investigation of chemical aging in composite propellants through laser-induced breakdown spectroscopy (LIBS)

2015 ◽  
Vol 124 (1) ◽  
pp. 279-286 ◽  
Author(s):  
Amir Hossein Farhadian ◽  
Masoud Kavosh Tehrani ◽  
Mohammad Hossein Keshavarz ◽  
Mehran Karimi ◽  
Seyyed Mohammad Reza Darbani ◽  
...  
Keyword(s):  
Laser Induced Breakdown Spectroscopy ◽  
Chemical Aging ◽  
Breakdown Spectroscopy ◽  
Novel Approach ◽  
Laser Induced Breakdown

A novel approach to sensitivity evaluation of laser-induced breakdown spectroscopy for rare earth elements determination

2016 ◽  
Vol 31 (11) ◽  
pp. 2223-2226 ◽  
Author(s):  
Timur A. Labutin ◽  
Sergey M. Zaytsev ◽  
Andrey M. Popov ◽  
Nikita B. Zorov
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Novel Approach ◽  
Sensitivity Evaluation ◽  
Laser Induced Breakdown

We report the potential of Laser-Induced Breakdown Spectroscopy (LIBS) for the determination of lanthanum and yttrium in soils and rocks.

Nanosecond laser-induced breakdown assisted by femtosecond laser pre-ionization in air: the effect on spatial resolution and continuous radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20701
Author(s):  
Bo Li ◽  
Xiaofeng Li ◽  
Zhifeng Zhu ◽  
Qiang Gao
Keyword(s):  
Femtosecond Laser ◽  
Spatial Resolution ◽  
Laser Induced Breakdown Spectroscopy ◽  
Nanosecond Laser ◽  
Breakdown Threshold ◽  
Powerful Technique ◽  
Breakdown Spectroscopy ◽  
Continuous Radiation ◽  
Laser Induced Breakdown

Laser-induced breakdown spectroscopy (LIBS) is a powerful technique for quantitative diagnostics of gases. The spatial resolution of LIBS, however, is limited by the volume of plasma. Here femtosecond-nanosecond dual-pulsed LIBS was demonstrated. Using this method, the breakdown threshold was reduced by 80%, and decay of continuous radiation was shortened. In addition, the volume of the plasma was shrunk by 85% and hence, the spatial resolution of LIBS was significantly improved.

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