Video: Yuav ua li cas koj xam luminous flux?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Lub lumen yog muab los ntawm chav tsev ntawm ci ntsa iab zog, candela (cd). Yog li ntawd, ib tug lumen luminous flux emitted nyob rau hauv unit khoom lub kaum sab xis (ib steradian) los ntawm ib tug me me qhov chaw muaj ib tug uniform luminous siv ntawm ib lub candela, yog li ntawd 1 lm = 1 cd sr, thiab tag nrho flux nyob rau hauv tag nrho cov lus qhia yog 4 π lm.
Tom qab ntawd, ib tug kuj yuav nug, dab tsi yog qhov ntsuas ntsuas rau luminous flux?
lumen (lwm
Ib tug kuj yuav nug, yuav ntsuas li cas radiant flux? SI unit of radiant flux yog watt (W), uas yog joule ib ob (J / s) hauv SI base units, thaum lub spectral flux Nyob rau hauv zaus yog watt per hertz (W / Hz) thiab cov spectral flux Nyob rau hauv wavelength yog lub watt ib 'meter' (W / m) - feem ntau lub watt ib nanometer (W / nm).
Ntxiv mus, qhov txawv ntawm lumens thiab luminous flux yog dab tsi?
Cov qhov sib txawv ntawm cov units lumen thiab lux yog hais tias lub lux yuav siv sij hawm mus rau hauv tus account lub cheeb tsam uas lub luminous flux yog kis. A flux ntawm 1000 lumens , concentrated rau hauv ib cheeb tsam ntawm ib square meter, teeb li square meter nrog ib tug illuminance ntawm 1000 lux.
Tag nrho luminous flux yog dab tsi?
Luminous flux yog qhov ntsuas ntawm qhov tag nrho tus nqi pom teeb tawm los ntawm lub teeb. Nws txawv ntawm qhov radiant flux . Hluav taws xob flux yog qhov ntsuas ntawm tag nrho cov hluav taws xob hluav taws xob hluav taws xob tawm (xws li infrared, ultraviolet thiab pom), uas yog tag nrho tus nqi ntawm lub hom phiaj teeb.
Pom zoo:
Yuav ua li cas koj xam tus qauv sib txawv ntawm PMP?
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