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

On-Line Monitoring of Laser Cleaning of Limestone by Laser-Induced Breakdown Spectroscopy and Laser-Induced Fluorescence

1997 ◽  
Vol 51 (8) ◽  
pp. 1125-1129 ◽  
Author(s):  
I. Gobernado-Mitre ◽  
A. C. Prieto ◽  
V. Zafiropulos ◽  
Y. Spetsidou ◽  
C. Fotakis
Keyword(s):  
Elemental Composition ◽  
Diagnostic Technique ◽  
Laser Induced Fluorescence ◽  
Laser Cleaning ◽  
Laser Induced Breakdown Spectroscopy ◽  
Cleaning Process ◽  
Experimental Conditions ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
On Line

The application of laser-induced breakdown spectroscopy (LIBS) to monitor the laser cleaning process of polluted limestone from a historic building is examined. The combination of a Q-switched Nd: YAG pulsed laser with on-line diagnostics by the LIBS technique is shown to be very useful for controlling and characterizing the cleaning process in order to avoid overcleaning. In addition, the coupling of this spectroscopic technique to the cleaning process provides important information about the optimal experimental conditions to be selected for achieving an adequate cleaning procedure. Furthermore, the spectroscopic study of the plasma emission can be used to determine the elemental composition of both the black crust and the underlying stone. The application of LIBS as a diagnostic technique to monitor and control the laser cleaning process of limestone is based on the different elemental composition of the black encrustations covering the stone surface and the underlying stone. On the other hand, a different experimental setup for probing the ablation products by laser-induced fluorescence (LIF), in order to achieve a signal amplification of some atomic emission lines with weak intensity in the LIBS spectrum, is described.

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.

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