Photometers are specifically designed to measure emitted, reflected or transmitted light in photometric terms of luminous flux, luminance, illuminance or luminous intensity.
光度计是专门用于测量发射，反射或透射光的光通量，亮度，照度或发光强度等。
Low light level TV is usually operated under extremely low illuminance or other adverse circumstances and the output SNR decreased to such a level that possibility of detection is greatly reduced.
微光电视工作于极低照度或恶劣环境下，输出信噪比明显降低，目标完全淹没在背景噪声中，使探测率大大下降。
Experiments show that the guide has high light-transmitting efficiency that makes high illuminance at the end of the guide so that the surface of the guide is illuminated uniformly.
实验表明，无缝棱镜导光管能够以较高的效率传输光线，并将光线较为均匀地分布于传播路径。
Experiments show that the guide has high light-transmitting efficiency that makes high illuminance at the end of the guide so that the surface of the guide is illuminated uniformly.
实验表明，无缝棱镜导光管能够以较高的效率传输光线，并将光线较为均匀地分布于传播路径。
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