scholarly journals On-line Monitoring of Nanoparticle Synthesis by Laser-Induced Breakdown Spectroscopy in Vacuum

MRS Advances ◽  
2016 ◽  
Vol 2 (28) ◽  
pp. 1487-1491 ◽  
Author(s):  
Jessica Picard ◽  
Jean-Baptiste Sirven ◽  
Olivier Sublemontier
Keyword(s):  
Particle Deposition ◽  
Nanoparticle Synthesis ◽  
Laser Induced Breakdown Spectroscopy ◽  
Phase Synthesis ◽  
Synthesis Of Nanoparticles ◽  
Breakdown Spectroscopy ◽  
Aerodynamic Focusing ◽  
Laser Induced Breakdown ◽  
On Line ◽  
A New Technique

ABSTRACTWe propose a new technique suitable for on-line monitoring of gas phase synthesis of nanoparticles. It is based on aerodynamic focusing of nanoparticles followed by Laser-Induced Breakdown Spectroscopy (LIBS) under vacuum. The laser crosses a beam of particles at low pressure so that the plasma-produced photons to be analyzed are emitted only from the particles. Unlike previous experiments, the background from interaction with the gaseous component is totally eliminated from the collected spectra. Vacuum allows also for easier spectra collection in the UV range. Moreover, as the nanoparticle beam is highly collimated, the optical interface windows are not obstructed by particle deposition and the system can be kept running for hours.

Design of a Laser-Induced Breakdown Spectroscopy System for On-Line Quality Analysis of Pulverized Coal in Power Plants

2009 ◽  
Vol 63 (8) ◽  
pp. 865-872 ◽  
Author(s):  
Wangbao Yin ◽  
Lei Zhang ◽  
Lei Dong ◽  
Weiguang Ma ◽  
Suotang Jia
Keyword(s):  
Sample Preparation ◽  
Measurement Errors ◽  
Power Plants ◽  
Pulverized Coal ◽  
Quality Analysis ◽  
Laser Induced Breakdown Spectroscopy ◽  
Gas Cleaning ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
On Line

It is vitally important for a power plant to determine the chemical composition of coal prior to combustion in order to obtain optimal boiler control. In this work, a fully software-controlled laser-induced breakdown spectroscopy (LIBS) system comprising a LIBS apparatus and sampling equipment has been designed for possible application to power plants for on-line quality analysis of pulverized coal. Special attention was given to the LIBS system, the data processing methods (especially the normalization with Bode Rule/DC Level) and the specific settings (the software-controlled triggering source, high-pressure gas cleaning device, sample-preparation module, sampling module, etc.), which gave the best direct measurement for C, H, Si, Na, Mg, Fe, Al, and Ti with measurement errors less than 10% for pulverized coal. Therefore, the apparatus is accurate enough to be applied to industries for on-line monitoring of pulverized coal. The method of proximate analysis was also introduced and the experimental error of Aad (Ash, ‘ad’ is an abbreviation for ‘air dried’) was shown in the range of 2.29 to 13.47%. The programmable logic controller (PLC) controlled on-line coal sampling equipment, which is designed based upon aerodynamics, and is capable of performing multipoint sampling and sample-preparation operation.

scholarly journals Laser-Induced Breakdown Spectroscopy of AL-Samples: Application to Chemical Analysis of Metallic Elementsf

1995 ◽  
Vol 16 (2) ◽  
pp. 75-82 ◽  
Author(s):  
B. Bescós ◽  
J. Castaño ◽  
A. González Ureña
Keyword(s):  
Chemical Analysis ◽  
Simultaneous Detection ◽  
Laser Induced Breakdown Spectroscopy ◽  
Minor Components ◽  
Experimental Conditions ◽  
Breakdown Spectroscopy ◽  
Non Invasive ◽  
Multichannel Analysis ◽  
Laser Induced Breakdown ◽  
On Line

This paper reports on the simultaneous detection of Mg, Mn, Fe and Pb in Al samples using laser-induced breakdown spectroscopy and optical multichannel analysis of the photoablated microplasma. Using calibrated samples, well characterized linear working curves were determined for these minor components over the 0.01–1% concentration range. In addition optimum experimental conditions were found that allow the analysis to be carded out in a fast and non-invasive manner. The potential application of the method to on-line industrial analysis is also suggested.

Laser-Induced Breakdown Spectroscopy for the On-Line Multielement Analysis of Highly Radioactive Glass Melt. Part I: Characterization and Evaluation of the Method

2002 ◽  
Vol 56 (4) ◽  
pp. 437-448 ◽  
Author(s):  
Jong-Il Yun ◽  
Reinhardt Klenze ◽  
Jae-Il Kim
Keyword(s):  
Spectral Range ◽  
Liquid Waste ◽  
Plasma Temperature ◽  
Multielement Analysis ◽  
Laser Induced Breakdown Spectroscopy ◽  
High Level Liquid Waste ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
On Line ◽  
Echelle Spectrometer

Laser-induced breakdown spectroscopy (LIBS) is presented for the on-line multielement analysis of molten radioactive glass at a simulated vitrification process of high level liquid waste (HLLW). A plasma plume is produced by focusing the third harmonic of a Nd: YAG laser (λ = 355 nm) onto the glass melt surface at 1200 °C, and the plasma emission is guided via optical fiber and is characterized by an echelle spectrometer for the spectral range from 200 to 780 nm with a resolution of ±0.01 nm. Compared to a Czerny–Turner spectrometer, the echelle spectrometer appears distinctively superior for its broad operational spectral range and high resolution. The laser-induced plasma is found as optically thin and locally in thermodynamic equilibrium (LTE) as characterized by measuring the electron density and plasma temperature. The matrix temperature effect on the spectral emission is observed as significant, increasing the emission line intensities with increasing temperature, but differently from element to element. The applicability of LIBS is demonstrated on a laboratory scale with an inactive simulated HLLW glass melt for various analytical characteristics concerned.

Laser-induced breakdown spectroscopy for on-line control of laser cleaning of sandstone and stained glass

1999 ◽  
Vol 69 (4) ◽  
pp. 441-444 ◽  
Author(s):  
S. Klein ◽  
T. Stratoudaki ◽  
V. Zafiropulos ◽  
J. Hildenhagen ◽  
K. Dickmann ◽  
...  
Keyword(s):  
Laser Cleaning ◽  
Laser Induced Breakdown Spectroscopy ◽  
Stained Glass ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
On Line
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