Laser Induced Breakdown Spectroscopy (LIBS)—innovative method for on-site measurements on chloride contaminated building materials

2015 ◽  
pp. 59-60
Author(s):  
S. Millar ◽  
T. Eichler ◽  
G. Wilsch ◽  
C. Gottlieb
Keyword(s):  
Building Materials ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Innovative Method ◽  
Laser Induced Breakdown ◽  
Chloride Contaminated

scholarly journals Granulometric Discrimination of Marine Sediments Based on Trace Metal Content Measured by the Technique LIBS (Laser Induced Breakdown Spectroscopy)-=SUP=-*-=/SUP=-

2021 ◽  
Vol 129 (3) ◽  
pp. 372
Author(s):  
M. Niang ◽  
G.Y. Mbesse Kongbonga Kongbonga ◽  
H. Ghalila ◽  
H. Majdib ◽  
N.A. Boye Faye Faye ◽  
...  
Keyword(s):  
Trace Metal ◽  
Building Materials ◽  
Marine Pollution ◽  
Inorganic Compounds ◽  
Relative Concentration ◽  
Principal Component ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Trace Metal Content ◽  
Laser Induced Breakdown

The accumulation of sediment in the harbors hinders the easy movement of boats. To avoid this, dredging operations are carried out regularly to restore correct functioning but also to present water quality managing the huge amount of dredged sediments and recycling them into building materials is a major challenge for the treatment of these sediments. It is within this framework that we propose to use the Laser Induced Breakdown Spectroscopy (LIBS) as a promising new technique for measuring trace metal concentrations of marine sediment samples. Our work has focused on the effect of granulometry on the relative concentration of inorganic compounds. The Principal Component Analysis (PCA) discriminated between different sediment clustering them into three groups: G1 (1.25mm-75 μm), G2 (75 μm-50 μm) and G3 (< 50 μm). Significant differences between element concentrations in the three groups, corroborating published works, were observed and concentrations in each group are reported in this study. Keywords: heavy metals, grain size, LIBS, chemometrics, marine pollution.

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.

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

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