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Discharge plasma sources supported by magnetic field
Kolpaková, Anna ; Kudrna, Pavel (advisor) ; Marek, Aleš (referee)
This work concerns the low-temperature plasma diagnostic in the dcdischarge in the cylindrical magnetron in argon. For measurements Langmuir and emissive probes were used. The aim of this diploma work was the diagnostics of the radial plasma parameters especially with the improved construction of the emissive probe and the verification of it's use for the determination of the plasma potential. The work was also focused on the influence of the angle between the emissive probe loop and the magnetic field to the emissive probe data. In the experimental part the cylindrical magnetron system, the construction of Langmuir and emissive probes and the probe circuit are described. After that the software for the data acquisition created using Agilent VEE programming language and evaluation of probe data is explained. Probe characteristics were measured by the Langmuir probe in the dependence on the radial position. In such way the radial profiles of the plasma potential, floating potential and electron density were determined. Measurements were performed at different values of the pressure, magnetic field and the discharge current. The floating potential of the strongly emitting probe was used to measure the plasma potential at different magnetic field strengths.
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Pollen charakterisation in size segregated aerosol
Kolpakova, Anna ; Hovorka, Jan (advisor) ; Zíková, Naděžda (referee)
This bachelor thesis, in literature review, deals with bioaerosol issue, describes meaning of pollen, ways of pollen spreading and its influence on human health, summarize methods of pollen sampling from the air and common ways of pollen grains identification. In the experimental part, the use of the first stage of a High Volumetric Cascade Impactor (Hi-Vol) BGI-900 for bioaerosol sampling and subsequent SEM analysis was proved. Method of pollen separation from the impaction substrate, polyurethane foam, into homogeneous deposit on Nylon filter was optimized. Representative portion of the deposit was analyzed by SEM. There were taken 485 SEM pictures from 12 samples in 3 localities in the ČR. Pollen grains were identified in 295 SEM and determined into 9 genus and 4 families and grain deformities were quantified to be 24, 18, 50% for Prague, Brezno and Láz localities. Number of pollen increased with total aerosol mass in Prague locality only. Thre aleo identified insect secrction products borochomomes in the samples. Key words: pollen, pollen grain, bioaerosol, cascade impactor, SEM.
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Discharge plasma sources supported by magnetic field
Kolpaková, Anna ; Kudrna, Pavel (advisor) ; Marek, Aleš (referee)
This work concerns the low-temperature plasma diagnostic in the dcdischarge in the cylindrical magnetron in argon. For measurements Langmuir and emissive probes were used. The aim of this diploma work was the diagnostics of the radial plasma parameters especially with the improved construction of the emissive probe and the verification of it's use for the determination of the plasma potential. The work was also focused on the influence of the angle between the emissive probe loop and the magnetic field to the emissive probe data. In the experimental part the cylindrical magnetron system, the construction of Langmuir and emissive probes and the probe circuit are described. After that the software for the data acquisition created using Agilent VEE programming language and evaluation of probe data is explained. Probe characteristics were measured by the Langmuir probe in the dependence on the radial position. In such way the radial profiles of the plasma potential, floating potential and electron density were determined. Measurements were performed at different values of the pressure, magnetic field and the discharge current. The floating potential of the strongly emitting probe was used to measure the plasma potential at different magnetic field strengths.
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