Dab tsi yog qhov zoo ntawm illuminance meters?
Compact Size, Lub teeb yuag
Qhov loj me thiab lub teeb yuag yog thawj qhov yuav tsum tau ua ua ntej rau cov ntsuas hluav taws xob portable vim tias lawv tau siv ntau yam kev siv thiab feem ntau nyob hauv ntau qhov chaw.
Qhov tseeb
Qhov zoo thiab qhov tsis zoo ntawm lub ntsuas hluav taws xob, thiab nws qhov tseeb muaj kev sib raug zoo. Ntawm chav kawm, nws kuj yog ze ze rau nws tus nqi, yog li tus nqi tsim nyog yuav tsum raug siab dua ntawm lub ntsuas hluav taws xob yog qhov tsim nyog, feem ntau rau qhov yuam kev tsis tshaj ± 15% yog qhov tsim nyog.
Xim Xaus
Cov hom teeb pom kev zoo nyob thoob plaws qhov chaw, qee qhov ntawm lawv nyiam qhov ntev wavelength ntawm cov teeb liab siab siab, lossis luv luv wavelengths ntawm xiav-violet xws li Hnub Teeb fluorescent teeb; kuj tseem muaj ntau qhov kev faib tawm xws li incandescent qhov muag teev series, tib lub teeb pom kev zoo rau qhov sib txawv wavelengths ntawm nws rhiab heev yuav txawv me ntsis, yog li qhov tsim nyog them nyiaj yog tsim nyog.
Cosine Compensation
Raws li peb txhua tus paub, qhov ci ntsa iab ntawm qhov illuminated nto yog cuam tshuam nrog lub kaum sab xis ntawm qhov xwm txheej ntawm lub teeb ci. Nyob rau hauv tib txoj kev, thaum ntsuas nrog lub teeb meter, lub kaum sab xis ntawm lub sensor thiab qhov teeb meem teeb pom kev zoo yuav muaj kev cuam tshuam rau kev nyeem ntawv ntawm lub teeb ntsuas. Yog li ntawd, lub illuminance meter zoo muaj ib cosine them nyiaj ua haujlwm yuav tsum tsis txhob ignored.
Lub hauv paus ntsiab lus ntawm calibration:
Ua Ls perpendicular irradiation photocell → E=I / r2, hloov r tuaj yeem tau txais nyob rau hauv qhov sib txawv illuminance tus nqi ntawm lub teeb tam sim no, los ntawm kev sib raug zoo ntawm E thiab kuv yuav tau hloov dua siab tshiab los ntawm qhov ntsuas tam sim no mus rau illuminance scale.
Txoj kev Calibration:
Kev siv lub teeb siv hluav taws xob teeb pom kev zoo, nyob ze rau qhov chaw ua haujlwm ntawm qhov chaw teeb pom kev zoo, hloov lub photocell thiab tus qauv teeb nyob deb l, kaw nyob rau hauv qhov kev ncua deb ntawm ammeter nyeem, los ntawm txoj cai inverse square ntawm kev ncua deb E {{ 0}} I / r2 xam ntawm lub teeb illuminance E, uas tuaj yeem tau txais los ntawm ntau qhov sib txawv ntawm cov teeb pom kev sib txawv ntawm lub teeb tam sim no tus nqi ntawm i, rau lub photocurrent i thiab qhov illuminance ntawm E nkhaus, uas yog, rau qhov illuminance ntawm calibration. nkhaus ntawm qhov illuminance no tuaj yeem ua rau hu Qhov no yog calibration nkhaus ntawm lub illuminometer, uas yog lub calibration ntawm lub illuminometer.
