本文利用高感度的光電晶體製成光感測器，針對螢光燈的發光現象作個探討。經過實驗測試，此光感測器的確能有效地偵測螢光燈的發光現象。光感測器所偵測到的光波動波形和燈管功率的波形非常相似。根據所偵測到的結果，螢光燈操作在交流電流時會產生光波動的現象。無論是低頻的電磁耦合式安定器或是一般高頻的電子式安定器，都會讓螢光燈的發光產生二倍頻的波動，而且整支燈管的發光亮度不是均勻的，愈靠近電極端的發光波動愈是明顯。當一端燈絲開始出現黑頭時，燈管的發光亦有別於正常的燈管。
為了能進一步地探討螢光燈光波動的現象，本文提出多相控制安定器以改善螢光燈發光的波動問題。根據數學推算，多支燈管在平衡多相電流操作下的總瞬時功率為一常數，因此多支燈管的總瞬時發光亮度理應也是維持不變。本文已完成一個雛型三相控制之電子安定器。根據實驗結果，證實多相控制確實可以有效地改善螢光燈的光波動現象。

Fluorescent lamps with ac current generate alternating lamp power and thus the light fluctuates at twice the operating frequency. To observe the light fluctuation from a fluorescent lamp, a light detector is built by using high sensitivity phototransistors in this thesis. The test results show that the light output waveform is very similar to that of the lamp power. It is also found that the light output from the whole lamp tube is not identical because the light output fluctuation becomes significant when close to the end of the lamp. When the lamp comes to the life-end, its light output is different from those produced by lamps of good conditions.
In attempts to further discuss the features of light fluctuation, an electronic ballast with balanced multi-phase outputs is designed and built to reduce the variation in the light output. With a balanced multi-phase operation, the resultant light output from lamps’ multi-phase currents should be a constant. An experimental 3-phase electronic ballast circuit is built to test this theoretical prediction. Experimental tests confirm that the light fluctuation can be effectively reduced by operating lamps with balanced multi-phase currents.

Abstract in Chinese I
Abstract II
List of Contents III
List of Figures V
Chapter 1 Introduction 1
1-1 Research Background and Motivation 1
1-2 Content Arrangement 2
Chapter 2 Fluorescent Lamp and Light Detector 3
2-1 Construction and Radiation 3
2-2 The Performance of Lamps 6
2-2-1 Luminous Efficacy 6
2-2-2 Lumen Maintenance 7
2-2-3 High-Frequency Operation of Fluorescent Lamps 7
2-3 Light Detector 8
2-3-1 The Quantification of Fluorescent Lamps Light Output 9
2-3-2 Light Output from the Middle of Lamp 10
2-4 Circuit Configuration and Device 12
Chapter 3 Light Output from Fluorescent Lamps 15
3-1 Light Output from Lamp 15
3-2 AC Component of Light Output 18
3-3 Ripple Factor 21
3-4 Radiation on The Lamp Ends 22
3-5 Symmetrical Light Output 23
3-6 Darkened End of Lamps 24
3-7 Time Delay of The Lamp Power and Light Variation 25
Chapter 4 Multi-phase Operation 28
4-1 Circuit Configuration 29
4-2 Experimental Results 31
4-2-1 3-phase Operation with 60° Phase Angle Control Signals 31
4-2-2 3-phase Operation with 120° Phase Angle Control Signals 32
4-2-3 Resultant 3-phase Light Outputs 36
Chapter 5 Conclusions and Discussions 40
References 42

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