Test method thiab txoj cai ntawm illuminance meter
1. Lub hauv paus ntsiab lus ntawm illuminance test
Illuminance yog qhov ntom ntom ntawm cov luminous flux tau txais ntawm lub dav hlau illuminated. Illuminance kua txiv yog ib qho cuab yeej siv los ntsuas qhov illuminance ntawm lub teeb pom kev zoo, thiab nws yog ib qho ntawm cov cuab yeej siv dav hauv kev ntsuas illuminance.
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2. Lub hauv paus ntsiab lus ntawm illuminance meter
Lub illuminance meter yog tsim los ntawm ob qhov chaw: lub taub hau photometric (tseem hu ua lub teeb tau txais kev sojntsuam, suav nrog lub receiver, V (λ) khub lim, thiab cosine corrector) thiab nyeem ntawv.
Kev ntsuas cov kauj ruam thiab cov txheej txheem
Hauv chav ua haujlwm, qhov teeb pom kev zoo yuav tsum ntsuas ntawm txhua qhov chaw ua haujlwm (xws li lub rooj, workbench) thiab tom qab ntawd nruab nrab. Rau ib chav khoob lossis chav tsis ua haujlwm tsis muaj qhov chaw ua haujlwm tau lees paub, yog tias tsuas yog siv lub teeb pom kev zoo xwb, qhov illuminance feem ntau yog ntsuas ntawm lub dav hlau kab rov tav nrog qhov siab ntawm 0.8m. Faib qhov ntsuas thaj tsam rau hauv daim phiaj (lossis ze rau squares) ntawm qhov sib npaug, ntsuas qhov illuminance Ei ntawm qhov nruab nrab ntawm txhua daim phiaj, thiab nws qhov nruab nrab illuminance yog sib npaug rau qhov nruab nrab ntawm qhov illuminance ntawm txhua qhov taw tes, uas yog
Qhov twg Eav - qhov nruab nrab illuminance ntawm qhov ntsuas cheeb tsam, lx;
Ei —— lub teeb pom kev ntawm qhov chaw ntawm txhua daim phiaj ntsuas, lx;
N - tus naj npawb ntawm cov ntsiab lus ntsuas.
Uniformity ntawm illuminance yog hais txog qhov piv ntawm qhov tsawg kawg nkaus illuminance mus rau qhov nruab nrab illuminance ntawm ib qho chaw, uas yog:
Nyob rau hauv cov mis, Emin — hais txog qhov tsawg kawg nkaus illuminance ntawm qhov ntsuas qhov chaw, lx.
Hauv qhov kev sim no, qhov saum npoo ntawm qhov ntsuas qhov ntsuas tau teeb tsa hauv chav yuav siv tau raws li qhov chaw tsim, thiab qhov tsawg kawg nkaus illuminance tuaj yeem suav tias yog qhov tsawg kawg nkaus illuminance tus nqi hauv qhov ntsuas ntsuas.
Ntsuas qhov ntev ntawm txhua qhov square hauv chav li lm, thiab chav loj tuaj yeem ua tau
Qhov twg Eav - qhov nruab nrab illuminance ntawm qhov ntsuas cheeb tsam, lx;
Ei —— lub teeb pom kev ntawm qhov chaw ntawm txhua daim phiaj ntsuas, lx;
N - tus naj npawb ntawm cov ntsiab lus ntsuas.
Uniformity ntawm illuminance yog hais txog qhov piv ntawm qhov tsawg kawg nkaus illuminance mus rau qhov nruab nrab illuminance ntawm ib qho chaw, uas yog:
Nyob rau hauv cov mis, Emin — hais txog qhov tsawg kawg nkaus illuminance ntawm qhov chaw yuav tsum tau ntsuas, lx.
Hauv qhov kev sim no, qhov saum npoo ntawm qhov ntsuas qhov ntsuas tau teeb tsa hauv chav yuav siv tau raws li qhov chaw tsim, thiab qhov tsawg kawg nkaus illuminance tuaj yeem suav tias yog qhov tsawg kawg nkaus illuminance tus nqi hauv qhov ntsuas ntsuas.
Ntsuas qhov ntev ntawm txhua qhov square hauv chav li lm, thiab chav loj tuaj yeem siv 2-4 m. Nyob rau hauv qhov nqaim thiab ntev tsheb thauj mus los xws li kev taug kev thiab ntaiv, cov ntsiab lus ntsuas tau npaj raws li kab nruab nrab ntawm txoj kab ntev, nrog qhov sib nrug ntawm 1-2 m; lub dav hlau ntsuas yog theem av los yog kab rov tav dav hlau 150 hli saum av.
Qhov ntau ntawm cov ntsiab lus ntsuas, qhov zoo dua qhov nruab nrab illuminance tus nqi tau txais, tab sis nws kuj siv sij hawm ntau dua thiab lub zog. Yog tias qhov tso cai ntsuas qhov yuam kev ntawm Eav yog ± 10 feem pua, qhov kev ua haujlwm tuaj yeem raug txo los ntawm kev xaiv qhov ntsuas qhov tsawg tshaj plaws raws li chav ntsuas ntsuas. Qhov kev sib raug zoo ntawm ob yog teev nyob rau hauv Table 1. Yog hais tias tus naj npawb ntawm cov teeb yog raws nraim li tus naj npawb ntawm cov ntsiab lus ntsuas tau muab rau hauv lub rooj, cov ntsiab lus ntsuas yuav tsum tau ntxiv.
