Conversion kev sib raug zoo ntawm illuminometer brightness thiab illuminance units
1) Thaum lub teeb ci ntsa iab ib yam khoom, peb tuaj yeem ntsuas qhov twg tawm los ntawm lub teeb ci (Luminance? D brightness) lossis qhov twg yog qhov cuam tshuam los ntawm cov khoom (Illuminance? D illuminance).
(2) Illuminance nyob ntawm qhov kev xav ntawm qhov khoom. Nws zoo ib yam li daim duab, nws tsuas yog ntsuas lub teeb pom kev. Nws universal unit yog lux.
(3) Txawm li cas los xij, lub teeb EL yog lub teeb ci: nws yuav tsum tau qhia nyob rau hauv chav nyob ntawm qhov ci, xws li fL (ko taw Lambert) lossis cd / m2, tseem hu ua "nits". Qee tus engineers nyiam siv fL, thaum lub koom haum thoob ntiaj teb cov qauv siv nits. Cov mis rau hloov cov nits rau fL yog: 1nits × 0.2919=1fL; Thiab 1fL × 3.426=1nits [Note; Cov yam ntxwv no tau muab los ntawm pi (π) thiab m2/ft2 ({10}}.0929).
(4) Pom tseeb, siv lux yog chav tsev tsis raug thiab tsis tuaj yeem hloov los ntawm lux mus rau lwm chav.
Luminous flux
Luminous flux: yog hais txog tus nqi ntawm lub teeb lub zog tawm los ntawm lub teeb ci lossis qhov ntws ntawm lub teeb (Flowrate), uas yog qhov tseem ceeb uas qhia txog lub peev xwm ntawm lub teeb ci, thiab ntsuas hauv lumens. Piv txwv li, lub teeb 100 watt (W) tuaj yeem tsim tau 1750lm, thaum lub 40W txias dawb fluorescent raj tuaj yeem tsim 3150lm ntawm luminous flux. Raws li lub ntsiab txhais, 1lm yog lub luminous flux emitted los ntawm ib tug uniform point lub teeb qhov chaw nrog ib tug luminous siv (l) ntawm 1cd nyob rau hauv ib tug khoom lub kaum sab xis ntawm 1 spherical degree.
Conversion kev sib raug zoo ntawm brightness thiab illuminance units (illuminometer)
Luminous flux: cov cim Φ, Unit lumen Lm, qhia tag nrho cov teeb ci tawm los ntawm lub cev luminous ib ob, piv txwv li luminous flux siv: cim I, unit candela cd, qhia lub luminous flux tawm los ntawm lub cev luminous nyob rau hauv ib qho kev taw qhia thiab unit khoom lub kaum sab xis Illuminance: cim E, unit lux Lm / m2, qhia lub luminous flux brightness ntawm lub luminous lub cev ntawm lub chav tsev ntawm lub illuminated khoom: cim L, unit nit cd / m2, piav qhia ntawm lub luminous flux thiab luminous efficiency ntawm Lub cev luminous nyob rau hauv ib qho kev taw qhia tshwj xeeb, chav tsev lub kaum ntse ntse, thiab cheeb tsam cheeb tsam: Lm / w ib watt lumen, qhia lub peev xwm ntawm lub teeb pom kev zoo los hloov hluav taws xob rau hauv lub teeb, qhia los ntawm kev faib cov luminous flux emitted los ntawm lub zog noj.
