多达几十种的准直器和滤光片的自由组合。
There are tens of combinations between the collimators and the filters.
提出了用红外滤光片与普通摄像机组合来代替红外摄像机的想法。
The idea of ordinary cameras combined with infrared filters to replace the infrared camera was proposed.
通过实验给出了三元组合双折射滤光片的透射曲线，其透射光谱带宽较窄，次峰被抑制在10%以下。
The transmission curve of birefringent filter is given experimentally. Its transmission bandwidth is very narrow and all the sub-peaks are suppressed fewer than 10%.
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