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Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.00 vteřin. 
Module for the detection of light elements in ferrous alloys by the Laser-Induced Breakdown Spectroscopy technique
 Hrabal, Zdeněk ; Novotný, Karel (oponent) ; Novotný, Jan (vedoucí práce)
This diploma thesis' aim is an investigation of light elements (i.e. carbon, sulphur and phosphorus) in ferrous alloys using Laser-Induced Breakdown Spectroscopy (LIBS). The primary goal is both the development and implementation of the new module enabling an analysis of vacuum ultraviolet (VUV) radiation which is necessary for the steel analysis and also more applications of LIBS. The first part surveys the state-of-the-art approaches of optical emission spectroscopy (OES), as well as the overview of traditional techniques used for steel analyse. The theory concerning the absorption of VUV by the air and optical glasses has been also investigated in order to get the essential theoretical background for the development of the module. The experimental module was carried out prior to the final design in order to test the concept of the VUV analysis by LIBS. On the basis of this testing, the final design was proposed based on the unique wedge mechanism. The prototype was made up in cooperation with an external manufacturer and then the performances of the module were demonstrated by measurements of five certified steel standards. The experiments determined the limit of detection for carbon as 0.028 wt.%. Nevertheless, neither sulphur nor phosphorus were detected in any of studied sample. This thesis establishes the essential know-how for further investigation of the VUV-LIBS analysis in the Laboratory of laser spectroscopy in Brno.
Úplný záznam
Module for the detection of light elements in ferrous alloys by the Laser-Induced Breakdown Spectroscopy technique
 Hrabal, Zdeněk ; Novotný, Karel (oponent) ; Novotný, Jan (vedoucí práce)
This diploma thesis' aim is an investigation of light elements (i.e. carbon, sulphur and phosphorus) in ferrous alloys using Laser-Induced Breakdown Spectroscopy (LIBS). The primary goal is both the development and implementation of the new module enabling an analysis of vacuum ultraviolet (VUV) radiation which is necessary for the steel analysis and also more applications of LIBS. The first part surveys the state-of-the-art approaches of optical emission spectroscopy (OES), as well as the overview of traditional techniques used for steel analyse. The theory concerning the absorption of VUV by the air and optical glasses has been also investigated in order to get the essential theoretical background for the development of the module. The experimental module was carried out prior to the final design in order to test the concept of the VUV analysis by LIBS. On the basis of this testing, the final design was proposed based on the unique wedge mechanism. The prototype was made up in cooperation with an external manufacturer and then the performances of the module were demonstrated by measurements of five certified steel standards. The experiments determined the limit of detection for carbon as 0.028 wt.%. Nevertheless, neither sulphur nor phosphorus were detected in any of studied sample. This thesis establishes the essential know-how for further investigation of the VUV-LIBS analysis in the Laboratory of laser spectroscopy in Brno.
Úplný záznam

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