Identifying laser-induced plasma emission spectra of particles in a gas–solid flow based on the standard deviation of intensity across an emission line

2018 ◽  
Vol 33 (10) ◽  
pp. 1676-1682 ◽  
Author(s):  
Shunchun Yao ◽  
Lifeng Zhang ◽  
Kejing Yin ◽  
Kaijie Bai ◽  
Jialong Xu ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Emission Spectra ◽  
Laser Induced Breakdown Spectroscopy ◽  
Plasma Emission ◽  
Solid Flow ◽  
Laser Induced Plasma ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Line P ◽  
Deviation Method

A scheme named the standard deviation method is presented for identifying the spectral data of a gas–solid flow based on laser-induced breakdown spectroscopy.

Laser-Induced Breakdown Spectroscopy for Polymer Identification

1998 ◽  
Vol 52 (3) ◽  
pp. 456-461 ◽  
Author(s):  
R. Sattmann ◽  
I. Mönch ◽  
H. Krause ◽  
R. Noll ◽  
S. Couris ◽  
...  
Keyword(s):  
High Density Polyethylene ◽  
Emission Spectra ◽  
Low Density Polyethylene ◽  
Laser Induced Breakdown Spectroscopy ◽  
Spectral Features ◽  
Low Density ◽  
Plasma Emission ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Polymer Type

Laser-induced breakdown spectroscopy has been applied to polymer samples in order to investigate the possibility of using this method for the identification of different materials. The plasma emission spectra of high-density polyethylene (HDPE), low-density polyethylene (LDPE), polyvinyl chloride (PVC), polyethylene terephthalate (PET), and polypropylene (PP) have been studied. Spectral features have been measured—for example, the 725.7 nm chlorine line, the 486.13 mm Hβ line, and the 247.86 nm carbon line—whose evaluation with neural networks permits identification accuracies between 90 and 100%, depending on polymer type.

Alternative Statistical Methods for Spectral Data Processing: Applications to Laser-Induced Breakdown Spectroscopy of Gaseous and Aerosol Systems

2008 ◽  
Vol 62 (10) ◽  
pp. 1144-1152 ◽  
Author(s):  
L. A. Álvarez-Trujillo ◽  
A. Ferrero ◽  
J. J. Laserna ◽  
D. W. Hahn
Keyword(s):  
Standard Deviation ◽  
Data Processing ◽  
Spectral Data ◽  
Homogeneous System ◽  
Laser Induced Breakdown Spectroscopy ◽  
Ensemble Averaging ◽  
Breakdown Spectroscopy ◽  
Analyte Signal ◽  
Laser Induced Breakdown ◽  
Deviation Method

A new spectral data processing scheme based on the standard deviation of collected spectra is compared with the traditional ensemble-averaging of laser-induced breakdown spectroscopy (LIBS)-based spectral data for homogenous (i.e., pure gas phase) systems and with a LIBS-based traditional conditional spectral analysis scheme for non-homogenous (e.g., aerosol system) analyte systems under discrete particle loadings. The range of conditions enables quantitative assessment of the analytical approaches under carefully controlled experimental conditions. In the homogeneous system with gaseous carbon dioxide producing the carbon atomic emission signal, the standard deviation method provided a suitable metric that is directly proportional to the analyte signal and compares favorably with a traditional ensemble averaging scheme. In contrast, the applicability of the standard deviation method for analysis of non-homogenous analyte systems (e.g., aerosol systems) must be carefully considered. It was shown both experimentally and via Monte Carlo simulations that the standard deviation approach can produce an analyte response that is monotonic with analyte concentration up to a point at which the analyte signal starts to transition from a non-homogeneous system to a homogeneous systems (i.e., around a 50% sampling point for aerosol particles). In addition, the standard deviation spectrum is capable of revealing spectral locations of non-homogeneously dispersed analyte species without a priori knowledge.

Characterization of Amethysts from Sukamara, Central Kalimantan, Using Laser-Induced Breakdown Spectroscopy (LIBS)

2020 ◽  
Vol 1 (2) ◽  
pp. 5-8
Author(s):  
Komang Gde Suastika, Heri Suyanto, Gunarjo, Sadiana, Darmaji
Keyword(s):  
Emission Intensity ◽  
Laser Energy ◽  
Emission Spectra ◽  
Atomic Emission ◽  
Laser Induced Breakdown Spectroscopy ◽  
Chemical Formula ◽  
Central Kalimantan ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

Abstract - Laser-Induced Breakdown Spectroscopy (LIBS) is one method of atomic emission spectroscopy using laser ablation as an energy source. This method is used to characterize the type of amethysts that originally come from Sukamara, Central Kalimantan. The result of amethyst characterization can be used as a reference for claiming the natural wealth of the amethyst. The amethyst samples are directly taken from the amethyst mining field in the District Gem Amethyst and consist of four color variations: white, black, yellow, and purple. These samples were analyzed by LIBS, using laser energy of 120 mJ, delay time detection of 2 μs and accumulation of 3, with and without cleaning. The purpose of this study is to determine emission spectra characteristics, contained elements, and physical characteristics of each amethyst sample. The spectra show that the amethyst samples contain some elements such as Al, Ca, K, Fe, Gd, Ba, Si, Be, H, O, N, Cl and Pu with various emission intensities. The value of emission intensity corresponds to concentration of element in the sample. Hence, the characteristics of the amethysts are based on their concentration value. The element with the highest concentration in all samples is Si, which is related to the chemical formula of SiO2. The element with the lowest concentration in all samples is Ca that is found in black and yellow amethysts. The emission intensity of Fe element can distinguish between white, purple, and yellow amethyst. If Fe emission intensity is very low, it indicates yellow sample. Thus, we may conclude that LIBS is a method that can be used to characterize the amethyst samples.Key words: amethyst, impurity, laser-induced, breakdown spectroscopy, characteristic, gemstones

Optimization of distances between the target surface and focal point on spatially confined laser-induced breakdown spectroscopy with a cylindrical cavity

2017 ◽  
Vol 32 (2) ◽  
pp. 367-372 ◽  
Author(s):  
Jin Guo ◽  
Junfeng Shao ◽  
Tingfeng Wang ◽  
Changbin Zheng ◽  
Anmin Chen ◽  
...  
Keyword(s):  
Emission Spectroscopy ◽  
Optical Emission Spectroscopy ◽  
Focal Point ◽  
Optical Emission ◽  
Target Surface ◽  
Laser Induced Breakdown Spectroscopy ◽  
Spatial Confinement ◽  
Laser Induced Plasma ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

The spatial confinement effect in laser-induced plasma with different distances between the target surface and focal point is investigated by optical emission spectroscopy.

Determination of antimony concentrations in widely used plastic objects by laser induced breakdown spectroscopy (LIBS)

2018 ◽  
Vol 33 (11) ◽  
pp. 1917-1924 ◽  
Author(s):  
Violeta Lazic ◽  
Montserrat Filella ◽  
Andrew Turner
Keyword(s):  
Laser Induced Breakdown Spectroscopy ◽  
Plasma Spectroscopy ◽  
Laser Induced Plasma ◽  
Breakdown Spectroscopy ◽  
Plastic Materials ◽  
Laser Induced Breakdown

In this study, the feasibility of measuring the Sb content in different plastic materials by laser induced plasma spectroscopy (LIBS) is explored.

scholarly journals High sensitivity hydrogen analysis in zircaloy-4 using helium-assisted excitation laser-induced breakdown spectroscopy

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Marincan Pardede ◽  
Indra Karnadi ◽  
Rinda Hedwig ◽  
Ivan Tanra ◽  
Javed Iqbal ◽  
...  
Keyword(s):  
Excited State ◽  
Nuclear Power ◽  
Emission Spectra ◽  
Target Material ◽  
High Sensitivity ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Low Concentrations ◽  
Laser Induced Breakdown ◽  
Excitation Laser

AbstractHigh-sensitivity detection of hydrogen (H) contained in zircaloy-4, a commonly used material for nuclear fuel containers, is crucial in a nuclear power plant. Currently, H detection is performed via gas chromatography, which is an offline and destructive method. In this study, we developed a technique based on metastable excited-state He-assisted excitation to achieve excellent quality of H emission spectra in double-pulse orthogonal laser-induced breakdown spectroscopy (LIBS). The production of metastable excited-state He atoms is optimized by using LiF as sub-target material. The results show a narrow full-width-at-half-maximum of 0.5 Å for the H I 656.2 nm emission line, with a detection limit as low as 0.51 mg/kg. Thus, using this novel online method, H in zircaloy-4 can be detected efficiently, even at very low concentrations.

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