The efficiency of a liquid scintillation detector may be varied by placing different optical filters between the vessel and the phototube.
在闪烁瓶和光电倍增管之间放置不同的滤光片以改变液体闪烁探测器的效率。
The optical properties of circular polarization filters made of cholesteric liquid crystal thin films are investigated.
研究了胆甾相液晶薄膜滤光器的光学性质，给出了这种薄膜的制作技术。
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