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# 光源原理与设计 — 低压水银荧光灯 - PowerPoint PPT Presentation

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## PowerPoint Slideshow about ' 光源原理与设计 — 低压水银荧光灯' - ezra

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5.1 低气压汞蒸汽放电的实验研究

electrode

filling gas

Hg Ar

glass tube

T12[φ38] PHg=0.8Pa

η∝ηuv 荧光粉转换效率

PHg↓→n↓→PHg↑→n* ↑→ηuv↑

→PHg↑↑→n* 禁锢↑→n**↑→ηuv↓

n ↑

+

1.作用

a)Buffer Gas (缓冲气体)

P=0.8Pa λ =5cm

PAr=100Pa λ =0.01cm

V*min(Ar)>Vi(Hg)

11.57V

10.4V

b)Penning Effect 降低启动电压

c)减小双极性扩散引起的带电粒子损失

d)控制电导率

e)减少电极物质的损失

2.惰性气体的种类选择与最佳充气压

a)气体种类对能损的影响

Ar : Kr : Xe=(300/40):(400/84):(700/130)

=7.5 : 4.8 : 5.4

b)气压对能耗的影响

PAr↑→n*↑→ηuv↑

PAr↑↑→n*↑→ηuv↑略上升

→P弹↑↑→ηuv↓

1.某汞蒸气压下存在最佳管径

PHg一定

d↑→禁锢↑→猝灭 ↑→ηuv↓

d↓→双极↑→ E↑→Ee↑→n* ↓→ηuv↓

2.长度l越长，越高

Pe=I l (E*lc+VAK)

Pe一定

lc↑→Il↓→P 电↓→ηuv↑

40W

100W

J↑→ Il ↑→ ne↑→ n*↑→ ηuv↑

J↑↑→ ne ↑↑→ P弹 ↑→ηuv↓

ηuv 要求J不宜太大

J＝0.03～0.13 A/cm

Ws要求J不宜太小