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辐射功率.
在輻射度量學中,辐射通量或辐射功率是对单位时间内通过某一面积的所有电磁辐射(包括红外、紫外和可见光)总功率的度量,既可以指一辐射源发出辐射的功率,也可以指到达某一特定表面的辐射能量的功率。
辐射通量的单位是瓦特(W),量纲为功/时间,SI单位表达为焦耳/秒。
物理量
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符号
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国际单位制
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單位符號
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注释
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輻射出射度(Radiant exitance)
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Me
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瓦特每平方米
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W·m−2
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表面出射的辐射通量
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辐射度(Radiosity)
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Je or Jeλ
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瓦特每平方米
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W⋅m−2
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表面出射及反射的辐射通量总和
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輻射率(Radiance)
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Le
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瓦特每球面度每平方米
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W·sr−1·m−2
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每單位立體角每單位投射表面的辐射通量。
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辐射能(Radiant energy)
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Qe
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焦耳
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J
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能量。
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辐射能量密度(Radiant energy density)
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ωe
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焦耳每立方米
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J⋅m−3
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辐射强度(Radiant intensity)
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Ie
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瓦特每球面度
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W·sr−1
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每單位立體角的辐射通量。
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辐射曝光量(Radiant exposure)
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He
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焦耳每平方米
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J⋅m−2
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辐射通量(Radiant flux)
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Φe
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瓦特
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W
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每單位時間的辐射能量,亦作「辐射功率」。
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輻照度(Irradiance)
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Ee
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瓦特每平方米
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W·m−2
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入射表面的辐射通量。
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光譜辐射出射度(Spectral radiant emittance)
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Meλ 或 Meν
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瓦特每立方米 或
瓦特每平方米每赫兹
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W⋅m−3 or W⋅m−2⋅Hz−1
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表面出射的辐射通量的波长或频率的分布
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光譜輻射率(Spectral radiance)
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Leλ 或
Leν
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瓦特每球面度每立方米 或
瓦特每球面度每平方米每赫兹
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W⋅sr−1⋅m−3 或 W⋅sr−1⋅m−2⋅Hz−1
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常用W⋅sr−1⋅m−2⋅nm−1
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光譜輻照度(Spectral irradiance)
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Eλ 或 Eν
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瓦特每立方米 或 瓦特每平方米每赫茲
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W·m−3 或 W·m−2·Hz−1
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通常測量單位為 W·m−2·nm−1
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光譜功率(Spectral power)
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Φeλ
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瓦特每米
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W⋅m−1
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辐射通量的波长分布
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光谱强度(Spectral intensity)
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Ieλ
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瓦特每球面度每米
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W⋅sr−1⋅m−1
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辐射强度的波长分布
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