Chav ntsuas ntsuas rau illuminance meters thiab tej yam kev mob ntawm kev siv
Ntau tus neeg muas zaub yuav hais tias, Kuv xav yuav ib lub illuminance meter, nws yog ntuj nug dab tsi yog chav tsev ntawm illuminance meter! Tam sim no cov lus qhia luv luv rau illuminance, illuminance ib chav tsev uas qhia txog kev siv lub teeb, nws lub ntsiab lus ntawm lub cev yog irradiated rau ib cheeb tsam ntawm luminous flux, illuminance unit yog tus naj npawb ntawm lumens ib square meter (Lm), los yog Lux (Lux) ): 1Lux=1Lm/m2. 1Lux=1Lm/m2. Raws li tuaj yeem pom los ntawm cov qauv saum toj no, Lm yog ib chav tsev ntawm cov luminous flux, uas txhais tau tias yog cov platinum ntshiab ntawm qhov kub ntawm cov yaj (kwv yees li 1770 ° C), qhov nyiaj ntawm lub teeb hluav taws xob nyob rau hauv lub tso suab lub kaum sab xis ntawm thaj chaw saum npoo hauv ib qho spherical degree ntawm 1/60 square meters. / 60 square metres ntawm thaj chaw saum npoo ntawm lub kaum sab xis steradian ntawm 1 degree ntawm sphericity yog tus nqi ntawm lub teeb hluav taws xob.
Cov lus piav qhia saum toj no ntawm chav teeb pom kev zoo li yog qhov theoretical heev thiab feem ntau nyuaj rau pom. Txhawm rau kom muaj kev nkag siab ntau ntxiv ntawm cov teeb pom kev zoo, piv txwv los piav qhia, 100W incandescent teeb, tag nrho cov luminous flux tawm yog txog 1200Lm, yog tias qhov kev xav tias lub luminous flux yog uniformly faib nyob rau hauv ib nrab ntawm lub sphere, ces. los ntawm lub teeb ci 1m thiab 5m ntawm tus nqi ntawm lub teeb pom kev tuaj yeem tau txais raws li cov kauj ruam hauv qab no: lub vojvoog ntawm 1m ntawm thaj tsam hemisphere ntawm 2π × 12=6.28 m2, los ntawm lub teeb qhov chaw 1m Tus nqi luminosity ntawm 1m ntawm lub teeb ci yog 1200Lm / 6.28 m2=191Lux. Ib yam li ntawd, thaj tsam ntawm lub hemisphere nrog lub vojvoog ntawm 5m yog 2π × 52=157 m2, thiab tus nqi luminosity ntawm 5m los ntawm lub teeb ci yog 1200Lm / 157 m2=7.64Lux.
Qhov xwm txheej dav dav: lub caij ntuj sov hauv lub hnub ci yog li 100000LUX; cloudy hnub sab nraum zoov illuminance yog 10000LUX; Sab hauv tsev fluorescent teeb illuminance yog 100LUX; peb yog 60cm deb ntawm 60W desktop teeb ntawm lub desktop illuminance yog 300LUX; TV broadcasting chav illuminance yog 1000LUX; thaum tsaus ntuj chav illuminance yog 10LUX; hmo ntuj txoj kev teeb illuminance yog 0.1LUX; taws tswm ciab illuminance (ntawm qhov deb ntawm 20cm deb) yog 10-15LUX.
Hais txog qhov twg, koj yuav tsum muaj kev nkag siab ntau dua ntawm lub ntsuas hluav taws xob yuav tsum muaj, qhov tseeb, kev siv hluav taws xob ntsuas hluav taws xob yog dav heev, cov chaw tsim khoom, tsev kawm ntawv, tsev qiv ntawv, tsev lag luam, tsev so, chaw ua lag luam, chaw soj nstuam, chav computer thiab lwm yam. ntawm, cov chaw no yuav tsum tau siv lub ntsuas hluav taws xob, nws tuaj yeem ua rau qhov tsis txaus ntseeg, tsuav yog muaj lub teeb ci hauv qhov chaw, nws tuaj yeem siv lub ntsuas hluav taws xob ntsuas qhov ntsuas tam sim no, thiab tam sim no muab peb tam sim no rau muab rau koj siv ntau qhov chaw illuminance siv tus nqi.
