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辐射度学(radiometry)是一门研究电磁辐射能测量的科学与技术。它是用能量单位描述光辐射能的客观物理量，适用于整个电磁波段
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)只限于可见光范围内（380nm-780nm），并以人眼的视觉特性为基础。
各个波长的光给人眼带来的“明亮”的感觉并不一致，而且这种视觉反应因个体的差异而有所不同，因此光度学把不同波长的辐射功率用光度函数(Luminosity function)加权，这个函数经由国际照明委员会（CIE）确认后，现已成为所有色彩科学使用的标准函数。
光谱光效能
',7)),Q("mjx-container",u1,[(t(),a("svg",L1,T[69]||(T[69]=[l('',1)]))),T[70]||(T[70]=Q("mjx-assistive-mml",{unselectable:"on",display:"block"},[Q("math",{xmlns:"http://www.w3.org/1998/Math/MathML",display:"block"},[Q("mi",null,"K"),Q("mo",{stretchy:"false"},"("),Q("mi",null,"λ"),Q("mo",{stretchy:"false"},")"),Q("mo",null,"="),Q("mfrac",null,[Q("mrow",null,[Q("msub",null,[Q("mi",{mathvariant:"normal"},"Φ"),Q("mi",null,"v")]),Q("mo",{stretchy:"false"},"("),Q("mi",null,"λ"),Q("mo",{stretchy:"false"},")")]),Q("mrow",null,[Q("msub",null,[Q("mi",{mathvariant:"normal"},"Φ"),Q("mi",null,"e")]),Q("mo",{stretchy:"false"},"("),Q("mi",null,"λ"),Q("mo",{stretchy:"false"},")")])])])],-1))]),Q("p",null,[T[75]||(T[75]=m("表示在某一波长上每一瓦辐射通量可以产生多少流明的光通量。 ")),Q("mjx-container",M1,[(t(),a("svg",x1,T[71]||(T[71]=[l('',1)]))),T[72]||(T[72]=Q("mjx-assistive-mml",{unselectable:"on",display:"inline"},[Q("math",{xmlns:"http://www.w3.org/1998/Math/MathML"},[Q("msub",null,[Q("mi",{mathvariant:"normal"},"Φ"),Q("mi",null,"e")]),Q("mo",{stretchy:"false"},"("),Q("mi",null,"λ"),Q("mo",{stretchy:"false"},")")])],-1))]),T[76]||(T[76]=m("即为上文所说的辐射通量，是真实的亮度，单位是瓦特; ")),Q("mjx-container",f1,[(t(),a("svg",w1,T[73]||(T[73]=[l('',1)]))),T[74]||(T[74]=Q("mjx-assistive-mml",{unselectable:"on",display:"inline"},[Q("math",{xmlns:"http://www.w3.org/1998/Math/MathML"},[Q("msub",null,[Q("mi",{mathvariant:"normal"},"Φ"),Q("mi",null,"v")]),Q("mo",{stretchy:"false"},"("),Q("mi",null,"λ"),Q("mo",{stretchy:"false"},")")])],-1))]),T[77]||(T[77]=m("叫光通量，即人眼感觉到的假的亮度，单位是流明。"))]),T[228]||(T[228]=Q("h4",{id:"_2-2-2-数据",tabindex:"-1"},[Q("a",{class:"header-anchor",href:"#_2-2-2-数据"},[Q("span",null,"2.2.2 数据")])],-1)),T[229]||(T[229]=Q("p",null,"光谱光效度（视觉函数）",-1)),Q("mjx-container",c1,[(t(),a("svg",Z1,T[78]||(T[78]=[l('',1)]))),T[79]||(T[79]=Q("mjx-assistive-mml",{unselectable:"on",display:"block"},[Q("math",{xmlns:"http://www.w3.org/1998/Math/MathML",display:"block"},[Q("mi",null,"V"),Q("mo",{stretchy:"false"},"("),Q("mi",null,"λ"),Q("mo",{stretchy:"false"},")"),Q("mo",null,"="),Q("mfrac",null,[Q("mrow",null,[Q("mi",null,"K"),Q("mo",{stretchy:"false"},"("),Q("mi",null,"λ"),Q("mo",{stretchy:"false"},")")]),Q("msub",null,[Q("mi",null,"K"),Q("mrow",{"data-mjx-texclass":"ORD"},[Q("mrow",{"data-mjx-texclass":"ORD"},[Q("mi",{"data-mjx-auto-op":"false"},"max")])])])])])],-1))]),T[230]||(T[230]=l('就是归一化的光谱光效能
蓝色线是人眼的暗视觉视觉函数数据，红色线是人眼的明视觉函数数据
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