The radiance will reduce if the size of extended light source is shortened.
减小光源尺寸会降低系统的光通量。
Therefore, a suitable size of extended light source can be chosen, considering the requirement of SNR in the optical design.
因此， 需要在设计中结合系统信噪比的要求， 选取合适尺寸的扩展光源。
It was found that the coherent length became shorter and the spectrum resolving power became lower as a result of solid Angle produced by the extended light source.
分析表明，扩展光源存在的立体角导致系统的相干长度变短，光谱分辨率降低。
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