因此,中性滤光片和光谱片的位置控制就显的尤为重要。
So the control of their position seems very important especially.
普通相机用滤光片来阻隔红外光谱范围内的任何光线。
Ordinary cameras use filters to block any light in the infrared spectrum.
第一章幻灯片是在,实验室里氦,氦钙以及钠的光谱。
The first slide is a spectrum made in the laboratory of hydrogen, helium and calcium and sodium.
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