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.
多篇文献提出在CCD前加高衰减率的中性滤光片来扩大测温范围。
Some papers indicate that using high attenuation rate neutral filter can expand the measuring range of CCD.
当透射式烟度计检测用标准中性滤光片的中性程度不好时，这种影响会影响其研制结果及实际使用。
When the transmission type smoke meter examination is not good with the standard neutral light filter neutral degree, this kind of affect can affect its prepare result and the actual use.
当透射式烟度计检测用标准中性滤光片的中性程度不好时，这种影响会影响其研制结果及实际使用。
When the transmission type smoke meter examination is not good with the standard neutral light filter neutral degree, this kind of affect can affect its prepare result and the actual use.
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