Analysis of spectral line shapes in low-temperature plasma by means of inverse ill-posed problem solution

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dc.contributor.advisorSkudra, Atis
dc.contributor.authorZorina, Nataļja
dc.contributor.otherLatvijas Universitāte. Fizikas un matemātikas fakultāte
dc.date.accessioned2017-03-17T02:01:23Z
dc.date.available2017-03-17T02:01:23Z
dc.date.issued2017
dc.description.abstractPromocijas darbs ir veltīts zemtemperatūras plazmas diagnostikas metodes attīstīšanai, augstfrekvences bezelektrodu lampām (ABL). Darbā tika izstrādāta jauna metode spektroskopisko datu apstrādei un reālo spektrāllīniju kontūru noteikšanai, risinot nekorekto apgriezto uzdevumu, kas balstās uz Tihonova regularizācijas algoritmu. Metode tika testēta aprēķinot patiesās profilu formas izmantojot eksperimentāli iegūtas Hg līnijās, emitētas no specialas formas mikro ABL. Tika pierādīts, ka aparatūras funkcijas neņemšana vērā zemtemperatūras plazmas gadījumā var ieviest lielu neprecizitāti, nosakot profilu formu un platumu un, sekojoši, ABL temperatūru. Tika analizēta arī atkarība no bufergāzes veida. Šī darba rezultāti tika nopublicēti 3 zinātniskas žurnālos (SCOPUS), 8 konferenču rakstu krājumos (5 - SCOPUS) un 8 tēzes. Atslēgvārdi : nekorektais apgrieztais uzdevums, regularizacija, spektrāllīnijas reālo profilu noteikšana, ABL diagnostika
dc.description.abstractThis thesis is dedicated to the development of the diagnostic methods of the low temperature plasma in case of high - frequency electrodeless discharge lamps (HFEDLs) . The new method of the restoring the real profile of the measured spectral lines by means of ill posed inverse task solution based on Tikhonov regularizing algorithm was developed in this thesis. The method was tested using experimental Hg spectral line shapes emitted from special design microsize HFEDLs. The influence of the instrumental function on the form and FWHM of the lines profiles were analyzed. It was proved that the neglecting the instrument function gives huge error for the FWHM estimation in the case of low – pressure or cold plasma. The influence of the type of buffer gas was investigated also. The results of this work are presented in 3 scientific journals (all in Scopus), 8 Proceedings of International Conferences (5 - Scopus) and 8 books of the abstracts. Keywords: ill posed inverse task, regularzaton, restoring the real profile of the spectral lines, diagnostic of HFEDLs
dc.identifier.other57045
dc.identifier.urihttps://dspace.lu.lv/dspace/handle/7/34901
dc.language.isoeng
dc.publisherLatvijas Universitāte
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectFizika
dc.subjectTeorētiskā fizika
dc.subjectPhysics
dc.subjectTheoretical Physics
dc.subject.othernekorektais apgrieztais uzdevums
dc.subject.otherregularizacija
dc.subject.otherspektrāllīnijas reālo profilu noteikšana
dc.subject.otherABL diagnostika
dc.subject.otherill posed inverse task
dc.subject.otherregularizaton
dc.subject.otherrestoring the real profile of the spectral lines
dc.subject.otherdiagnostic of HFEDLs
dc.titleAnalysis of spectral line shapes in low-temperature plasma by means of inverse ill-posed problem solution
dc.title.alternativeSpektrāllīniju profilu analīze zemtemperatūras plazmā, risinot apgriezto nekorekto problēmu
dc.typeinfo:eu-repo/semantics/doctoralThesis
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