臺灣博碩士論文加值系統

The silicon oil is filled in two parallel ITO glass plates and atmospheric
gas are injected into the silicon oil layer as a gas bubble. For turning on
the plasma, the gas bubble plays the role of gas chamber. We study the
beautiful radial evolution of the plasma bubble. By counting the luminescent
area of the plasma bubble and the shape of the gas bubble, we classify the
evolution of the plasma bubble with three stages. The bubble starts to
deform by temperature fluctuation on the boundary which is induced by ion
bombandments. We also show how to generate and to control the beautiful
radial evolution by changing the experimental parameters in different scales.
Thses controlled parameters are find some relations between the wavelength,
, of the plasma bubble. In the process of the plasma bubble evolving into
the radial fingering plasma bubble, there are bright spots in the fingertips
which are observed with microscope and it is found that some microbubble
are ejected from the tips. The radial fingering looks like the fractal pattern
and the fractal dimension of the fingering plasma bubble is found about 1.74
by sandbox method.
i

1 Introduction 1
2 Background 5
2.1 Gas discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1.1 Introduction of Gas Discharge . . . . . . . . . . . . . . 5
2.1.2 Electrical Mechanisms in Plasma . . . . . . . . . . . . 6
2.1.3 Secondary Emission . . . . . . . . . . . . . . . . . . . . 8
2.1.4 Self-Sustaining Discharge . . . . . . . . . . . . . . . . . 9
2.2 Dielectric Barrier Discharge . . . . . . . . . . . . . . . . . . . 10
2.2.1 Discharge Stabilization by Dielectric Layer . . . . . . . 10
2.2.2 Wall charge and memory effect . . . . . . . . . . . . . 12
2.3 Gas Bubble . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.4 Viscous Fingering Pattern . . . . . . . . . . . . . . . . . . . . 15
2.4.1 Saffman-Taylor instability . . . . . . . . . . . . . . . . 15
2.5 Short Introduction to Fractal Theory . . . . . . . . . . . . . . 17
3 Experimental Setup 20
4 Result and Discussion 24
4.1 Evolution of the plasma bubble . . . . . . . . . . . . . . . . . 25
4.2 Fluctuating spherical plasma bubble . . . . . . . . . . . . . . 27
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Contents
4.3 Sunflower-shaped plasma bubble . . . . . . . . . . . . . . . . . 34
4.4 Radial fingering plasma bubble . . . . . . . . . . . . . . . . . 39
5 Conclusion 48
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