光管，或称日光灯、灯管、荧光管、荧光灯，是一种照明装置，属于弧光灯的一种。它使用电力在氩或氖气中激发水银蒸气，形成等离子并发出短波紫外线，紫外线被磷质吸收后，磷会发出可见的光以照明，这样发出可见光的方式属于荧光。
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于日间，太阳能导光管可以把太阳光从屋顶引进室内，代替电灯或其他人造照明。
During daytime, solar tubes can introduce sunlight into indoor space from the rooftop, serving as a substitute to lamps or other artificial lightings.
此激光平行光管具有以前平行光管的优点，且可以与数字相移干涉仪对接，直接进行波前误差的高精度测量。
The laser collimator not only has the advantages of existing ones, but also can be used to measure wavefront error with high accuracy interferometer.
分辨率测试装置中采用非球面设计反射式平行光管，形成无穷远紫外分辨率目标，不仅减少了设计和加工成本，而且使紫外能量得到了最大程度的利用。
We also design a novel UV collimator which makes infinite UV testing targets. It can reduce the difficulty of optical design and the machining cost, and utilize UV energy at maximum extent.
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