用配光曲线作判据选择LED标准管

Selection of standard LED by luminous intensity distribution curve

鉴于LED标准管具有量值传递方便进而统一量值的优点,指出作为标准管不仅要保证赋值的准确性和其量值保持长期稳定性,选择LED标准管要求其配光曲线要好,即接近朗伯发光体。介绍了配光曲线的概念及为得到配光曲线而使用的分布光度计;列举了可供选择的3种类型的电光源和选择LED标准管时接触到的10种典型配光曲线以及3种错误的配光曲线,在此基础上明确了选择LED发光质量好的白光管作为标准管的理由。

Since LED is a convenient transfer standard, it is widely used in metrology. As a standard, the value of LED should be accurate and stable over a long period of time. LED is selected as standard because its luminous intensity distribution curve （LIDC） is close to that of Lambert light source. The concept of LIDC and the distribution photometer for measuring LIDC are introduced. Three typical electric light source options are given. Ten typical LIDCs and three erroneous LIDCs are given when LED is used as standard. The reason for selecting white light LED with good emitting feature as standard LED is elaborated.