The circuits can be realized easily and used conveniently and have a wide attenuation range. And the signal attenuation control can be automatized.
这两种电路容易实现，使用简便，具有较大的衰减范围，实现了信号衰减控制自动化。
Some papers indicate that using high attenuation rate neutral filter can expand the measuring range of CCD.
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。
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