- 學位論文
複數電弧間相互影響之研究
The Study of Influences Among Multiple Arc Discharges
摘要
光纖通訊在近年來蓬勃發展，快速且大量的訊號傳輸大多仰賴光纖系統，各種不同特性的光纖被開發、研究，不同種類光纖之間的熔接需求也逐漸出現，本研究從傳統電弧熔接機台熔接不同種類光纖時纖芯回縮現象作為出發點，希望以不通過纖芯的複數電弧之間的熱區熔接光纖外部包層而不過度加熱內部纖芯，以利進一步降低不同種類光纖之間的熔接損耗。本研究針對平行與交叉兩種電弧之間的位置關係，並改變其尖端徑向間距以及電流相對流向，擷取進入電弧電極的電壓電流訊號進行分析，研究兩條電弧之間的相對位置關係對於電弧造成的影響，並以單模光纖測試電弧中各部位的加熱效果。 本實驗中電弧系統由兩組電弧產生裝置所組成，兩組電弧的電訊號輸出相位相差180º。在平行電弧的實驗中，我們發現隨著尖端徑向間距下降兩條電弧互相靠近，崩潰電壓以及相位角下降，且電弧彎曲靠近。而當電弧進一步靠近，在平行電弧彎曲靠近處產生淺藍色電漿區域，此時崩潰電壓下降，但相位角則取決於電流相對流向：電流方向相同時相位角下降，而電流方向相反時相位角上升。在交叉電弧的實驗中，崩潰電壓隨著尖端徑向間距上升，在特定條件下觀測到額外平行電弧的產生，形成由封閉電弧包圍的電漿區域，伴隨出現的現象是相位角下降至負值，並以擷取到的電壓電流訊號計算出此平行電弧的功率。在四組實驗中皆可觀測到電弧功率的提升，而電弧功率受電弧電壓的影響最大，透過觀察發現電弧電壓的提升與電弧之間的電漿區域的出現有關。
並列摘要
Fiber-optic communication is flourishing in recent year, applying to most massive rapid communication systems. At the same time, requirements of splicing different optical fibers together greatly increase, since more and more optical fibers with different properties are created and studied. This study starts from the core-retracting phenomenon which happens at splicing two different optical fibers on traditional fusion splicers, aiming to solve the problem by heating only the cladding with multiple arc discharges which bypass the core, in order to reduce the splice loss caused by core-retracting. The study focuses on the influences between two arcs, which are generated in axial and radial directions of the optic fiber. Radial tip gaps and the relative direction of currents are changed while axial tip gaps are fixed. Voltage and current in the electrodes are analyzed in order to figure out the influences of the placing relationships. The heating abilities of different parts of the arcs are tested by single-mode fibers. In the study, the arc system is composed of two arc-producing devices with 180-degree phase difference between each other. In the experiment of parallel arcs, breakdown voltage and phase angle become lower when radial tip gap decreases, the arcs bend and get closer to each other at the same time. As the radial tip gap gets close enough, plasma area appears between the arcs, which also lowers the breakdown voltage, while phase difference between arcs decrease when in the same direction as the currents and increases when reversed. In the experiment of crossed arcs, breakdown voltage increases when radial tip gap increases. In some conditions, an additional parallel arc appears, which builds a closed plasma area surrounded by arc, accompanied with negative phase angle. The power of the additional parallel arcs is also calculated and discussed. According to the experiments, we find that the power of arc increases for some reason. The power of arc is most affected by the arc voltage, and the increase of arc voltage is related to the plasma area between arcs.