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PLASMA TEMPERATURE MEASUREMENTS IN THE CONTEXT OF SPECTRAL INTERFERENCE
| Title: | PLASMA TEMPERATURE MEASUREMENTS IN THE CONTEXT OF SPECTRAL INTERFERENCE. |
 56 views 24 downloads |
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| Name(s): |
Seesahai, Brandon, Author Baudelet, Matthieu, Committee Chair University of Central Florida, Degree Grantor |
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| Type of Resource: | text | |
| Date Issued: | 2016 | |
| Publisher: | University of Central Florida | |
| Language(s): | English | |
| Abstract/Description: | The path explored in this thesis is testing a plasma temperature measurement approach that accounts for interference in a spectrum. The Atomic Emission Spectroscopy (AES) technique used is called Laser Induced Breakdown Spectroscopy (LIBS) and involves focusing a laser pulse to a high irradiance onto a sample to induced a plasma. Spectrally analyzing the plasma light provides a "finger print" or spectrum of the sample. Unfortunately, spectral line broadening is a type of interference encountered in a LIBS spectrum because it blends possible ionic or atomic transitions that occur in plasma. To make use of the information or transitions not resolved in a LIBS spectrum, a plasma temperature method is developed. The basic theory of a LIBS plasma, broadening mechanisms, thermal equilibrium and distribution laws, and plasma temperature methods are discussed as background support for the plasma temperature method tested in this thesis. In summary, the plasma temperature method analyzes the Full Width at Half the Maximum (FWHM) of each spectral line for transitions provided from a database and uses them for temperature measurements. The first implementation of the temperature method was for simulated spectra and the results are compared to other conventional temperature measurement techniques. The temporal evolution of experimental spectra are also taken as a function of time to observe if the newly developed temperature technique can perform temporal measurements. Lastly, the temperature method is tested for a simulated, single element spectrum when considering interferences from all the elements provided in an atomic database. From stimulated and experimental spectra analysis to a global database consideration, the advantages and disadvantages of the temperature method are discussed. | |
| Identifier: | CFH2000140 (IID), ucf:46057 (fedora) | |
| Note(s): |
2016-12-01 B.S.P.S.E. College of Optics and Photonics, CREOL Bachelors This record was generated from author submitted information. |
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| Subject(s): |
Laser-Induced Plasma Local Thermodynamic Equilibrium Plasma Temperature Plasma Broadening Spectral Interference Boltzmann Plot |
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| Persistent Link to This Record: | http://purl.flvc.org/ucf/fd/CFH2000140 | |
| Restrictions on Access: | campus 2017-12-01 | |
| Host Institution: | UCF |
