Hom illuminance meters Calibration ntawm illuminance meters
Illuminance meter (los yog lux 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 ntsuas ntawm qhov pom ntawm ib yam khoom, uas yog, qhov sib piv ntawm cov luminous flux tau txais los ntawm qhov chaw ntawm cov khoom mus rau thaj chaw illuminated. Lub ntsuas hluav taws xob feem ntau yog tsim los ntawm selenium photocell lossis silicon photocell thiab microammeter.
Hom illuminance meter
1. Visual illuminance meter: siv tsis yooj yim, 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 siv cov photocell 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.
Feem ntau siv selenium (Se) photocell lossis silicon (Si) photocell illuminance meter, tseem hu ua lux meter.
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 high-resistance photocells, nws rhiab heev yog tsawg thiab zoo linearity, los ntawm lub teeb ci tsis yooj yim puas.
② V (λ) kho cov ntxaij lim dej them nyiaj sab hauv, haum rau illuminance nrog txawv xim kub lub teeb qhov chaw, me me yuam kev.
③ photocell ua ntej ntxiv cosine lub kaum sab xis them nyiaj (opal iav lossis yas dawb) vim tias lub kaum sab xis 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).
Calibration ntawm illuminance meter
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 illumination ntawm tus nqi ntawm lub teeb tam sim no, los ntawm kev sib raug zoo ntawm E thiab kuv yuav hloov mus rau qhov ntsuas tam sim no 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 qhov sib txawv ntawm lub teeb tam sim no tus nqi ntawm i, rau lub photocurrent i thiab lub illuminance ntawm E nkhaus, uas yog, rau lub illuminance ntawm lub calibration. nkhaus ntawm qhov illuminance no tuaj yeem ua rau hu Lub calibration nkhaus ntawm lub illuminometer yuav muab faib ua degrees, uas yog lub calibration ntawm lub illuminometer.
Cov yam ntxwv cuam tshuam rau calibration nkhaus:
Photocells thiab ammeter hloov yuav tsum tau rov calibrated; illuminance meter siv rau ib lub sij hawm ntawm lub sij hawm yuav tsum tau re-calibrated illuminance meter (feem ntau nyob rau hauv ib lub xyoo yuav tsum tau kuaj xyuas 1-2 zaug); high-precision illuminance meter tuaj yeem siv los kuaj xyuas lub teeb siv ntawm cov qauv teeb; nthuav qhov ntau ntawm calibration illuminance meter tuaj yeem hloov qhov kev ncua deb r, koj tuaj yeem xaiv cov qauv sib txawv, qhov kev xaiv ntawm qhov me me ntawm ammeter.
