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关 键 词:无极放电灯泡
行 业:机械 仪器仪表 试验机设备
发布时间:2020-05-16
PERKINELMER EXCLUSIVE WARRANTY*
System 2 Electrodeless Discharge Lamps
1. We warrant that during the first six months or after 500
hours of operation, whichever comes first, from initial
date of shipment, the lamps will meet or exceed the
intensity and absorption specifications to which all new
lamps are tested.
2. All our Electrodeless Discharge Lamps are warranted to
light and emit the spectra of the element indicated for
two years or 1,000 hours of operation from the initial
date of shipment, whichever comes first.
3. If any lamp fails before the expiration of the warranty
period, it will be replaced free of charge.
* The lamp warranty is void for lamps that sustain physical damage or are operated at power levels
substantially above or below the power level recommended on the lamp label. The lamp warranty may
vary in different countries.
无极放电灯通常明显更亮,在有些情况下,其灵敏度优于对应的空心阴极灯。特别适用于某些挥发性元素。对于因空心阴极发射较弱而存在大量噪音的分析而言,可提供更好的精确度和更低的检出限。珀金埃尔默由密封在充满惰性气体的一个石英灯泡内的某元素或该元素的盐组成。当施加一个能量充足的射频场时,惰性气体被电离,其所耦合的能量蒸发出该元素并在石英灯泡内进行原子激发,从而射出特征性光谱。
工作原理
无极灯工作原理是: 高频发生器产生频率为2.65 MHz 的高频波, 并同时产生一个3000 V 左右的点火电压, 高频波通过长不得超过0.5 m的高频馈线( 条件许可时, 越短越好, 减少高频能量消耗) 与耦合器连接, 耦合器装在灯泡内, 高频电磁场的能量以感应方式耦合进灯泡内, 灯泡通过功率耦合器在玻璃泡壳内瞬间建立一个高频磁场, 在高频磁场的作用下, 灯泡内部的惰性气体( 氪气和氩气的混合气体) 发生气体雪崩电离成等离子体, 等离子体受激, 原子返回基态时自发辐射出254 nm 的紫外线, 紫外线使灯泡内壁稀土荧光粉受到激发而发出可见光。
无极放电灯是由一个数厘米长、直径5-12厘米的石英玻璃圆管制成。
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