Cov chav kawm ntawm illuminance meters thiab ntsuas cov qauv
Illuminance meter yog ib qho cuab yeej tshwj xeeb rau kev ntsuas luminosity thiab brightness. Nws yog qhov ntsuas ntawm lub teeb siv (illuminance) yog qhov degree ntawm cov khoom yog illuminated, uas yog, qhov saum npoo ntawm cov khoom kom tau txais qhov sib piv ntawm luminous flux thiab thaj chaw illuminated. Illuminance meter feem ntau yog tsim los ntawm selenium photocell lossis silicon photocell thiab microampere meter.
Chav kawm ntawm illuminance meters:
1. pom qhov muag pom kev ntsuas: siv tsis yooj yim, tsis siab precision, tsis tshua siv
2. photoelectric illuminance meter: feem ntau siv selenium photocell illuminance meter thiab silicon photocell illuminance meter
Muaj pes tsawg leeg thiab kev siv ntawm photoelectric cell illuminance meter yuav tsum:
1. Composition: microampere meter, hloov pob qhov rooj, xoom hloov kho, davhlau ya nyob twg, photocells, V (λ) kho lim thiab lwm yam khoom.
2. Siv cov kev cai:
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 qhov siab tiv thaiv photocells, nws rhiab heev yog tsawg thiab zoo linearity, tsis yooj yim puas los ntawm lub teeb ci irradiation.
② them nyiaj hauv V (λ) kho lim, haum rau lub teeb pom kev zoo nrog lub teeb xim sib txawv, 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)
Ntsuas lub hauv paus ntsiab lus ntawm illuminance meter
Photocells yog cov khoom siv hluav taws xob uas hloov lub teeb hluav taws xob ncaj qha rau hauv hluav taws xob hluav taws xob. Thaum lub teeb raug coj mus rau saum npoo ntawm selenium photocell, qhov teeb meem teeb pom kev dhau los ntawm cov yeeb yaj kiab hlau 4 kom ncav cuag qhov sib faib ntawm cov semiconductor selenium txheej 2 thiab cov yeeb yaj kiab hlau 4, tsim cov nyhuv photovoltaic ntawm lub interface.
Qhov loj ntawm lub generated photogenerated tam sim no muaj ib tug 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 cov cuab yeej sib txawv-ceev, kom nws tuaj yeem ntsuas qhov pom kev siab thiab tsis tshua muaj illuminance. Cite hom illuminance meter:
1. Visual illuminance meter: siv tsis yooj yim, tsis siab precision, tsis tshua siv
2. photoelectric illuminance meter: feem ntau siv selenium photocell illuminance meter thiab silicon photocell illuminance meter
Cov yam ntxwv cuam tshuam rau qhov calibration nkhaus.
Photocells thiab ammeter hloov yuav tsum tau rov calibrated; illuminance meter yuav tsum tau siv rau ib lub sij hawm ntawm lub sij hawm yuav tsum tau re-calibrated illuminance meter (feem ntau nyob rau hauv ib xyoos yuav tsum tau calibrated 1-2 zaug); high-precision illuminance meter tuaj yeem siv los kuaj xyuas lub teeb siv ntawm cov qauv teeb; expanding illuminance meter calibrated range tuaj yeem hloov mus rau qhov kev ncua deb r, koj tuaj yeem xaiv lub teeb sib txawv, qhov kev xaiv ntawm qhov me me ntawm ammeter.
