Improved Intact Soil-Core Carbon Determination Applying Regression Shrinkage and Variable Selection Techniques to Complete Spectrum Laser-Induced Breakdown Spectroscopy (LIBS)

2013 ◽  
Vol 67 (10) ◽  
pp. 1185-1199 ◽  
Author(s):  
Ross S. Bricklemyer ◽  
David J. Brown ◽  
Philip J. Turk ◽  
Sam M. Clegg
Keyword(s):  
Variable Selection ◽  
Laser Induced Breakdown Spectroscopy ◽  
Soil Core ◽  
Complete Spectrum ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Intact Soil Core ◽  
Carbon Determination ◽  
Intact Soil

A fast variable selection method for quantitative analysis of soils using laser-induced breakdown spectroscopy

2017 ◽  
Vol 32 (6) ◽  
pp. 1166-1176 ◽  
Author(s):  
Xiao Fu ◽  
Fa-Jie Duan ◽  
Ting-Ting Huang ◽  
Ling Ma ◽  
Jia-Jia Jiang ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Variable Selection ◽  
Selection Method ◽  
Laser Induced Breakdown Spectroscopy ◽  
Fast Variable ◽  
Breakdown Spectroscopy ◽  
Variable Selection Method ◽  
Laser Induced Breakdown

A fast variable selection method combining iPLS and mIPW-PLS is proposed to reduce the dimensions of the spectrum for LIBS quantitative analysis.

scholarly journals Combining Laser-Induced Breakdown Spectroscopy (LIBS) and Visible Near-Infrared Spectroscopy (Vis-NIRS) for Soil Phosphorus Determination

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5419 ◽  
Author(s):  
Sara Sánchez-Esteva ◽  
Maria Knadel ◽  
Sergey Kucheryavskiy ◽  
Lis W. de Jonge ◽  
Gitte H. Rubæk ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Variable Selection ◽  
Near Infrared ◽  
Soil Phosphorus ◽  
Laser Induced Breakdown Spectroscopy ◽  
Soil P ◽  
Breakdown Spectroscopy ◽  
Extractable P ◽  
Laser Induced Breakdown ◽  
Wet Chemical

Conventional wet chemical methods for the determination of soil phosphorus (P) pools, relevant for environmental and agronomic purposes, are labor-intensive. Therefore, alternative techniques are needed, and a combination of the spectroscopic techniques—in this case, laser-induced breakdown spectroscopy (LIBS)—and visible near-infrared spectroscopy (vis-NIRS) could be relevant. We aimed at exploring LIBS, vis-NIRS and their combination for soil P estimation. We analyzed 147 Danish agricultural soils with LIBS and vis-NIRS. As reference measurements, we analyzed water-extractable P (Pwater), Olsen P (Polsen), oxalate-extractable P (Pox) and total P (TP) by conventional wet chemical protocols, as proxies for respectively leachable, plant-available, adsorbed inorganic P, and TP in soil. Partial least squares regression (PLSR) models combined with interval partial least squares (iPLS) and competitive adaptive reweighted sampling (CARS) variable selection methods were tested, and the relevant wavelengths for soil P determination were identified. LIBS exhibited better results compared to vis-NIRS for all P models, except for Pwater, for which results were comparable. Model performance for both the LIBS and vis-NIRS techniques as well as the combined LIBS-vis-NIR approach was significantly improved when variable selection was applied. CARS performed better than iPLS in almost all cases. Combined LIBS and vis-NIRS models with variable selection showed the best results for all four P pools, except for Pox where the results were comparable to using the LIBS model with CARS. Merging LIBS and vis-NIRS with variable selection showed potential for improving soil P determinations, but larger and independent validation datasets should be tested in future studies.

Validated ensemble variable selection of laser-induced breakdown spectroscopy data for coal property analysis

2021 ◽  
Author(s):  
Weiran Song ◽  
Zongyu Hou ◽  
Muhammad Sher Afgan ◽  
Weilun Gu ◽  
Hui Wang ◽  
...  
Keyword(s):  
Variable Selection ◽  
Cost Analysis ◽  
Low Cost ◽  
Laser Induced Breakdown Spectroscopy ◽  
Spectroscopy Data ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Coal Properties ◽  
Coal Property ◽  
Selection Of

Variable selection based on ensemble learning and validation for rapid and low-cost analysis of coal properties using laser-induced breakdown spectroscopy.

A simple method for forward variable selection and calibration: evaluation for compact and low-cost laser-induced breakdown spectroscopy system

2017 ◽  
Vol 409 (11) ◽  
pp. 3017-3024 ◽  
Author(s):  
Fabiano Barbieri Gonzaga ◽  
Lescy Romulo Braga ◽  
Alexandre Pimentel Sampaio ◽  
Thiago de Souza Martins ◽  
Charles Giovani de Oliveira ◽  
...  
Keyword(s):  
Variable Selection ◽  
Low Cost ◽  
Laser Induced Breakdown Spectroscopy ◽  
Simple Method ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Spectroscopy System
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