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辐射率

光源的辐射率辐亮度(radiance),是描述非点光源时光源单位面积强度的物理量,定义为在指定方向上的单位立体角和垂直此方向的单位面积上的辐射通量,记为

其中:辐射通量,单位瓦特(W);立体角,单位球面度(sr)。

参阅

国际单位制的辐射量单位
物理量 符号 国际单位制 单位符号 注释
辐射出射度(Radiant exitance) Me 瓦特每平方米 W·m−2 表面出射的辐射通量
辐射度(Radiosity) Je or J 瓦特每平方米 W⋅m−2 表面出射及反射的辐射通量总和
辐射率(Radiance) Le 瓦特球面度每平方米 W·sr−1·m−2 每单位立体角每单位投射表面的辐射通量
辐射能(Radiant energy) Qe 焦耳 J 能量
辐射能量密度英语Radiant energy density(Radiant energy density) ωe 焦耳每立方米 J⋅m−3
辐射强度(Radiant intensity) Ie 瓦特球面度 W·sr−1 每单位立体角的辐射通量。
辐射曝光量(Radiant exposure) He 焦耳每平方米 J⋅m−2
辐射通量(Radiant flux) Φe 瓦特 W 每单位时间的辐射能量,亦作“辐射功率”。
辐照度(Irradiance) Ee 瓦特每平方米 W·m−2 入射表面的辐射通量。
光谱辐射出射度(Spectral radiant emittance) M

M
瓦特每立方米

瓦特每平方米每赫兹

W⋅m−3
or
W⋅m−2⋅Hz−1
表面出射的辐射通量的波长或频率的分布
光谱辐射率(Spectral radiance) L

L

瓦特球面度每立方米

瓦特球面度每平方米每赫兹

W⋅sr−1m−3

W⋅sr−1⋅m−2Hz−1
常用W⋅sr−1⋅m−2⋅nm−1
光谱辐照度(Spectral irradiance) Eλ

Eν
瓦特每立方米
瓦特每平方米每赫兹
W·m−3

W·m−2·Hz−1
通常测量单位为 W·m−2·nm−1
光谱功率(Spectral power) Φ 瓦特每米 W⋅m−1 辐射通量的波长分布
光谱强度英语Radiant intensity(Spectral intensity) I 瓦特球面度每米 W⋅sr−1⋅m−1 辐射强度的波长分布

参考

http://www.phys.ncku.edu.tw/optics/book_2/b2_02_2002.pdf页面存档备份,存于互联网档案馆http://el.mdu.edu.tw/datacos//09910621007A/%E5%85%89%E9%9B%BB%E5%B7%A5%E7%A8%8B%E6%A6%82%E8%AB%96ch3-1.pdf[永久失效链接]

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辐射率
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