Besaran cahaya
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Satuan besaran cahaya
| SI radiometry units | ||||
|---|---|---|---|---|
| Radiant energy | Q | joule | J | energy |
| Radiant flux | watt | W | radiant energy per unit time, also called radiant power | |
| Radiant intensity | I | watt/steradian | W.sr−1 | power per unit solid angle |
| Radiance | L | watt/steradian/square meter | W.sr−1.m−2 | power per unit solid angle per unit projected source area called intensity in some other fields of study |
| Irradiance | E, I | watt/square meter | W.m−2 | power incident on a surface, sometimes confusingly called intensity |
| Radiant exitance / Radiant emittance | M | watt/square meter | W.m−2 | power emitted from a surface |
| Radiosity | J or J | watt/square meter | W.m−2 | emitted plus reflected power leaving a surface |
| Spectral radiance | L or Lv |
watt/steradian/meter3 or watt/steradian/square meter/hertz |
W.sr−1.m.−3 or W.sr−1.m−2.Hz−1 |
commonly measured in W.sr−1.m−2.nm−1 |
| Spectral irradiance | E or Ev |
watt/meter3 or watt/square meter/hertz |
W.m−3 or W.m−2.Hz−1 |
commonly measured in W.m−2.nm−1 |
| SI photometry units | ||||
| Luminous energy | Qv | lumen second | lm.s | units are sometimes called talbots |
| Luminous flux | F | lumen (= cd.sr) | lm | also called luminous power |
| Luminous intensity | Iv | candela (=lumen/sr) | cd | an SI base unit |
| Luminance | Lv | candela/square meter | cd/m2 | units are sometimes called "nits" |
| Illuminance | Ev | lux (= lm/m2) | lx | used for light incident on a surface |
| Luminous emittance | Mv | lux (= lm/m2) | lx | used for light emitted on a surface |
| Luminous efficacy | lumen/watt | lm/W | ratio of luminouos flux to radiant flux | |
Sumber Cahaya
- Radiasi panas (radiasi benda hitam)
- bola lampu
- matahari
- partikel padat bercahaya dalam suhu tinggi(lihat api)
- emisi spektral atomik
- laser dan maser
- light emitting diode
- lampu gas(lampu neon, lampu air raksa lamps dsb)
- api dari gas
- percepatan dari partikal bebas bermuatan(biasanya sebuah elektron)
- radiasi siklotron
- Radiasi Bremsstrahlung
- Radiasi Cherenkov
- kemoluminesens
- floresens
- fosforescence
- bioluminesens
- sonoluminesens
- triboluminesens
- peluruhan radioaktif
- anihilasi partikel-antipartikel
Referensi
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