Kev sib raug zoo ntawm illuminometer reflectivity thiab brightness
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 lub teeb pom kev, uas yog hu ua reflectance lossis reflectivity (feem pua) ntawm cov khoom nto ** Qhov kev xav ntawm qhov sib piv dub nto yog {{0}}, uas txhais tau hais tias txawm ntau npaum li cas lub teeb ntog rau nws, tsis muaj brightness generated thiab nws yog absorbed tag; 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
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).
Luminance to Illuminance Unit Conversion Relationship Luminous Flux: Symbol Φ, Unit lumen Lm, qhia tag nrho lub teeb tawm los ntawm lub cev luminous ib ob, piv txwv li luminous flux siv: cim I, unit candela cd, qhia lub luminous flux emitted los ntawm lub luminous Lub cev nyob rau hauv ib qho kev taw qhia tshwj xeeb thiab chav tsev lub kaum ntse ntse Illuminance: cim E, chav tsev lux Lm / m2, qhia lub luminous flux brightness ntawm lub luminous lub cev ntawm chav tsev ntawm lub illuminated khoom: cim L, unit nit cd / m2, piav qhia ntawm lub luminous flux thiab luminous efficiency ntawm lub luminous lub cev nyob rau hauv ib tug tej yam kev taw qhia, unit khoom lub kaum sab xis, thiab chav tsev cheeb tsam: Lm / w ib watt lumen, qhia lub peev xwm ntawm hluav taws xob lub teeb qhov chaw los hloov hluav taws xob lub zog rau hauv lub teeb, qhia los ntawm kev faib cov luminous flux. emitted los ntawm kev siv lub zog.
