Ntsuas lub hauv paus ntsiab lus ntawm illuminance meter thiab qhov ntsuas qhov xav tau
Ntsuas lub hauv paus ntsiab lus ntawm illuminance meter
Photoelectric cell yog ib qho khoom siv hluav taws xob uas ncaj qha hloov lub teeb lub zog rau hauv hluav taws xob hluav taws xob. Thaum lub teeb raug coj mus rau saum npoo ntawm selenium photocell, qhov teeb meem tshwm sim dhau los ntawm cov yeeb yaj kiab hlau 4 thiab mus txog qhov sib faib ntawm cov semiconductor selenium txheej 2 thiab cov yeeb yaj kiab hlau 4, tsim cov nyhuv photoelectric ntawm lub interface. Qhov loj ntawm cov photogenerated tam sim no muaj ib qho proportionality rau lub illumination ntawm lub teeb-tau txais nto ntawm lub photocell. Hauv qhov no, yog tias ib qho kev sib txuas sab nraud txuas nrog, qhov tam sim no dhau mus, thiab tus nqi ntawm qhov tam sim no qhia los ntawm microampere meter kawm tiav hauv lux (Lx). Qhov loj ntawm photocurrent nyob ntawm qhov siv ntawm qhov teeb meem teeb meem. Lub illuminance meter muaj qhov sib txawv ntawm cov khoom siv ceev, yog li nws tuaj yeem ntsuas qhov siab illuminance thiab qis illuminance.
Specification yuav tsum tau rau illuminance meters
● Compact Size, Lub teeb yuag
Qhov loj me thiab lub teeb yuag yog 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 lub teeb ntev ntawm lub teeb liab 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 (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.
Kev siv cov illuminance meter yuav tsum:
① photocell daim ntawv thov ntawm zoo linearity ntawm selenium (Se) photocells los yog silicon (Si) photocells; Lub sijhawm ua haujlwm ntev tuaj yeem ua kom muaj kev ruaj ntseg zoo, thiab siab rhiab heev; siab E thaum xaiv lub siab sab hauv photocells, nws tsis tshua muaj rhiab heev thiab zoo linearity, tsis yooj yim puas los ntawm lub teeb ci irradiation.
② them nyob rau hauv lub V (λ) kho lim, haum rau illuminance nrog ib tug txawv xim kub lub teeb qhov chaw, qhov yuam kev me me
③ photocell ua ntej qhov sib ntxiv ntawm cosine lub kaum sab xis them nyiaj (opal iav lossis yas dawb) vim tias qhov xwm txheej yog qhov loj, lub photocell deviates los ntawm txoj cai cosine.
④ illuminance meter yuav tsum ua hauj lwm nyob rau hauv chav tsev kub los yog nyob ze ntawm chav tsev kub (photocell drift nrog kub hloov thiab hloov)
