Besaran cahaya

Satuan besaran cahaya 
SI radiometry units Quantity Symbol SI unit Abbr. Notes 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−1SI photometry units Quantity Symbol SI unit Abbr. Notes 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
 tabung sinar katode
 bioluminesens
 sonoluminesens
 triboluminesens
 peluruhan radioaktif
 anihilasi partikel-antipartikel

 Referensi 

Kategori:Fisika