Conversion kev sib raug zoo ntawm illuminance meter brightness thiab illuminance unit
Luminous flux
Luminous flux: tus nqi ntawm lub teeb lub zog tawm los ntawm lub teeb qhov chaw lossis qhov ntws ntawm lub teeb (Flowarte), uas yog qhov yooj yim kom muaj nuj nqis los piav qhia lub peev xwm ntawm lub teeb ci kom tawm lub teeb, thiab chav tsev yog Lumen. Piv txwv li, lub teeb 100 watt (W) tuaj yeem tsim tau 1,750lm, thaum lub 40W txias dawb fluorescent raj tuaj yeem tsim 3,150lm 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 luminous siv (l) 1cd nyob rau hauv ib tug khoom lub kaum sab xis ntawm 1 steradian.
lub teeb siv
Luminous intensity (Candlepower): Luminous intensity, referred to as luminosity, refers to the luminous flux emitted from a solid angle (unit: sr) of the light source, that is, the distribution density of the luminous flux emitted by the light source or lighting fixture in the selected direction of space, The unit is candlelight (Candle or Candela, cd). A light source with a luminous intensity of 1cd can emit a luminous flux of 12.57lm. Illuminance (luminance): The density of the luminous flux received on the illuminated plane, which can be measured by the luminous flux per unit area. The luminous flux of 1lm is evenly distributed on the surface of 1 square meter (m2), that is, the illuminance of 1 lux (Lux, environmental protection technology>illuminance meter) yog tsim; lub luminous flux ntawm 1lm ntog rau ntawm qhov chaw ntawm 1 square feet (ft2), thiab nws tus nqi illuminance yog 1 ko taw tswm ciab (Footcandle, fc).
Luminance Luminance los yog ci ntsa iab (luminance, Brightness): Thaum tib neeg lub qhov muag pom ib yam dab tsi, nws tuaj yeem qhia tau ob txoj hauv kev: ib qho yog siv rau cov uas muaj qhov muaj txiaj ntsig zoo dua xws li lub teeb los yog teeb, thiab nws ncaj qha qhia los ntawm nws cov luminous siv. Qhia; lwm yam yog siv rau cov neeg uas tsis emit lub teeb thiab tsuas yog muaj kev cuam tshuam lub teeb, xws li: sab hauv tsev los yog tej yam khoom, qhia nyob rau hauv brightness. Brightness yog lub luminous siv emitted los yog reflected nyob rau hauv ib tug tej yam kev taw qhia ntawm ib chav tsev cheeb tsam ntawm lub illuminated khoom, uas yog siv los qhia qhov txawv ntawm lub teeb thiab ntxoov ntxoo ntawm cov khoom illuminated. Chav ntsuas yog Candela / m2, cd / m2 los yog nit (nit), lub imperial unit yog Footlambert (Footlambert, fl).
Reflectance lossis reflection yam: qhov ci ntawm qhov chaw nyob ntawm seb lub teeb poob rau ntawm nws thiab lub peev xwm ntawm qhov chaw kom pom lub teeb; Tus nqi thiab kev faib tawm ntawm lub teeb nws tuaj yeem cuam tshuam yog nyob ntawm qhov xwm txheej ntawm cov khoom nto, Qhia los ntawm qhov sib piv ntawm cov teeb pom kev zoo rau qhov teeb meem teeb meem, nws yog hu ua reflectance lossis reflectance (feem pua) ntawm qhov chaw ntawm cov khoom. **Qhov kev xav ntawm qhov chaw dub yog {{0}}, uas yog, txawm tias lub teeb poob rau ntawm nws npaum li cas, tsis muaj qhov ci thiab nws tau nqus tag nrho; Ntawm qhov tsis sib xws, qhov cuam tshuam ntawm ** dawb saum npoo yog 1 (reflectivity 100 feem pua, nqus tus nqi 0 feem pua). Rau qhov ntsuas ntawm qhov cuam tshuam, ua ntej, tso lub ntsuas hluav taws xob rau ntawm qhov chaw ntawm qhov khoom los nyeem nws qhov chaw teeb pom kev zoo Ei (Incidentlight), thiab tom qab ntawd tso tus nqi illuminance rau nws 5-8cm (qhov chaw photosensitive ntsib saum npoo. thiab lees paub tias tsis muaj duab ntxoov ntxoo thaiv), uas yog qhov cuam tshuam illuminance tus nqi Er (Reflected light) tuaj yeem ntsuas tau, thiab cov quotient tau los ntawm kev faib cov illuminance saum npoo los ntawm qhov cuam tshuam illuminance yog qhov cuam tshuam ntawm cov khoom nto.
(Illuminance meter) Conversion kev sib raug zoo ntawm brightness thiab illuminance units Luminous flux: cim Φ, unit lumen Lm, qhia cov sum ntawm tus nqi ntawm lub teeb emitted los ntawm lub luminous lub cev ib ob, uas yog, luminous flux Lub teeb siv: cim I, unit candela cd, qhia tias lub cev luminous yog nyob rau hauv ib qho kev taw qhia Lub luminous flux illuminance emitted nyob rau hauv lub unit khoom lub kaum sab xis: cim E, unit lux Lm / m2, qhia lub luminous flux brightness ntawm lub luminous lub cev irradiated nyob rau hauv lub chav tsev cheeb tsam ntawm lub illuminated khoom : cim L, chav tsev Nito cd/m2, qhia tias lub luminous lub cev yog nyob rau hauv ib qho kev taw qhia Luminous flux thiab luminous efficiency ib chav tsev khoom lub kaum sab xis ntawm chav tsev: chav tsev yog lumen ib watt Lm / w, qhia lub peev xwm ntawm lub teeb hluav taws xob qhov chaw hloov hluav taws xob rau hauv lub teeb, qhia los ntawm kev faib cov emitted luminous flux los ntawm lub zog noj.
