Luminous siv ntawm illuminometer
Luminous intensity (Candlepower): Luminous intensity, abbreviated as luminosity, refers to the luminous flux emitted from a solid angle of a light source (unit: sr), which is the density distribution of the luminous flux emitted by the light source or lighting fixture in a selected direction in space, in candlelight (cd). A light source with a luminous intensity of 1cd can emit a luminous flux of 12.57lm. Luminance: The density of the luminous flux received on the illuminated plane, measured by the luminous flux per unit area. A light flux of 1lm is evenly distributed on a surface of 1 square meter (m2), resulting in an illuminance of 1 lux (environmental technology>illuminometer); Lub teeb flux ntawm 1lm ntog rau ntawm qhov chaw ntawm 1 square feet (ft2), thiab nws tus nqi illumination yog 1 footcandle (fc).
Luminance, Brightness: Thaum ib tug neeg lub qhov muag pom ib yam dab tsi, nws muaj peev xwm qhia tau nyob rau hauv ob txoj kev: firstly, nws yog siv rau ntau dua luminous qhov tseem ceeb, xws li lub teeb los yog teeb, thiab yog ncaj qha sawv cev los ntawm nws luminous siv; Lwm qhov yog siv rau cov neeg uas tsis emit lub teeb tab sis tsuas yog muaj kev cuam tshuam lub teeb, xws li cov chaw sab hauv tsev lossis cov khoom siv dav dav, qhia hauv qhov ci. Luminance yog hais txog lub luminous siv emitted los yog xav txog ib cheeb tsam ntawm qhov kev kawm nyob rau hauv ib tug tej yam kev taw qhia, siv los qhia qhov txawv nyob rau hauv brightness ntawm qhov kev kawm. Chav ntsuas ntsuas yog candela/square meter (cd/m2) lossis nit, thiab chav tsev lus Askiv yog Footlambert (fl).
Reflectance lossis reflectivity yam: Qhov ci ntsa iab ntawm qhov chaw nyob ntawm tus nqi ntawm 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 cov khoom ntawm cov khoom siv saum npoo, sawv cev los ntawm qhov sib piv ntawm lub teeb pom kev rau teeb pom kev zoo. Qhov sib piv ntawm qhov chaw dub, uas yog hu ua qhov piv ntawm qhov sib piv lossis qhov cuam tshuam (feem pua) ntawm cov khoom nto, yog {{0}}, txhais tau tias txawm tias lub teeb poob rau ntawm nws, tsis muaj qhov ci. generated thiab nws yog absorbed kiag li; Ntawm qhov tsis sib xws, qhov cuam tshuam ntawm * * dawb saum npoo yog 1 (reflectance 100 feem pua, nqus 0 feem pua). Txhawm rau ntsuas qhov cuam tshuam, ua ntej tso lub illuminometer rau ntawm qhov chaw ntawm qhov khoom los nyeem nws qhov chaw illuminance tus nqi Ei (Incidentlight), thiab tom qab ntawd muab qhov illuminance tus nqi 5-8cm saum toj no (nrog rau cov duab photosensitive rau saum npoo thiab xyuas kom meej. tsis muaj duab ntxoov ntxoo thaiv) los ntsuas nws qhov cuam tshuam illuminance tus nqi Er (Reflectedlight). Lub quotient ntawm qhov chaw illuminance muab faib los ntawm qhov cuam tshuam illuminance yog qhov cuam tshuam ntawm cov khoom nto
