Hegaode qhov muag zoo tshaj plaws illuminance meter ntsuas txoj cai siv cov kauj ruam
① Tig lub zog.
② Qhib lub hau ntawm lub photodetector thiab tso lub photodetector kab rov tav ntawm txoj hauj lwm ntsuas.
③ Xaiv lub iav ntsuas tsim nyog.
Yog tias tsuas yog "1" tso tawm rau ntawm sab laug kawg ntawm cov zaub, nws txhais tau hais tias lub teeb pom kev ntau dhau, thiab koj yuav tsum nias qhov tseem ceeb (⑧ qhov tseem ceeb) los kho qhov ntsuas ntau.
④ Lub illuminance meter pib ua hauj lwm thiab qhia cov illuminance tus nqi ntawm cov zaub.
⑤ Cov ntaub ntawv tso tawm ntawm lub vijtsam zaub hloov tas li. Thaum cov ntaub ntawv tso tawm yog qhov ruaj khov, nias HOLD tus yuam sij txhawm rau xauv cov ntaub ntawv.
⑥ Nyeem thiab sau cov txiaj ntsig pom tshwm hauv tus nyeem ntawv. Tus nqi pom zoo yog sib npaug ntawm cov khoom ntawm tus lej tso tawm ntawm qhov nyeem ntawv thiab tus nqi ncua.
Piv txwv li: 500 tso tawm kom pom ntawm lub vijtsam, cov xwm txheej tshwm sim nyob rau hauv kaum sab xis yog "× 2000", thiab qhov ntsuas qhov pom kev yog 1000000lx, uas yog (500 × 2000).
⑦ Nias lub ntsuas phoo dua kom thim qhov kev nyeem ntawv ntsuas phoo.
⑧ Rau txhua qhov kev soj ntsuam, nyeem peb ntu sib law liag thiab sau lawv.
⑨ Tom qab txhua qhov kev ntsuas tiav, nias lub hwj huam hloov yuam sij kom txiav tawm lub hwj chim.
⑩ Kaw lub photodetector npog thiab muab nws rov qab rau hauv lub thawv.
Kev ntsuas txoj cai
Photovoltaic cells yog cov khoom siv hluav taws xob uas ncaj qha hloov lub teeb lub zog rau hauv hluav taws xob hluav taws xob. Thaum lub teeb tsoo rau saum npoo ntawm selenium photovoltaic cell, qhov teeb meem teeb dhau los ntawm cov hlau nyias zaj duab xis 4 thiab mus txog qhov sib cuam tshuam ntawm semiconductor selenium txheej 2 thiab cov hlau nyias zaj duab xis 4, tsim cov nyhuv photoelectric ntawm lub interface. Qhov loj ntawm lub generated photocurrent muaj ib tug proportional kev sib raug zoo nrog lub illuminance ntawm lub teeb-tau txais nto ntawm lub photocell. Lub sijhawm no, yog tias ib qho kev sib txuas sab nraud txuas nrog, qhov tam sim no yuav ntws, thiab tus nqi tam sim no yuav qhia rau ntawm microammeter nrog qhov ntsuas ntawm lux (Lx). Qhov loj ntawm photocurrent nyob ntawm qhov siv ntawm qhov teeb meem teeb. Lub illuminance meter muaj ib qho kev hloov khoom siv, yog li nws tuaj yeem ntsuas qhov siab illuminance lossis qis illuminance. Hom illuminance meters tau hais tseg: 1. Visual illuminance meter: siv tsis yooj yim, tsis tshua muaj neeg, tsis tshua siv 2. Photoelectric illuminance meter: Selenium photocell illuminance meter thiab silicon photocell illuminance meter feem ntau siv.
Illumination calibration
Calibration txoj cai:
Cia Ls irradiate lub photocell vertically → E=I/r2, hloov r kom tau tus nqi photocurrent nyob rau hauv txawv illuminance, thiab hloov lub teev tam sim no mus rau hauv lub illuminance scale raws li kev sib raug zoo ntawm E thiab i.
Txoj kev Calibration:
Siv lub teeb siv hluav taws xob teeb pom kev zoo, nyob rau hauv qhov kev ua haujlwm ntawm qhov kwv yees ntawm qhov chaw teeb pom kev zoo, hloov qhov kev ncua deb l ntawm lub photocell thiab cov teeb pom kev zoo, sau cov ntawv nyeem ntawm ammeter ntawm txhua qhov kev ncua deb, suav cov illuminance E los ntawm txoj cai inverse square ntawm nrug E=I/r2, thiab xam qhov illuminance E los ntawm Qhov no tuaj yeem tau txais cov txiaj ntsig photocurrent i nrog cov teeb pom kev sib txawv, thiab ua rau qhov hloov pauv ntawm photocurrent i thiab illuminance E, uas yog calibration nkhaus ntawm illuminance meter. Los ntawm qhov no, lub calibration ntawm lub illuminance meter yuav ua tau los ntawm kev faib lub dial ntawm lub illuminance meter.
Cov yam ntxwv cuam tshuam rau calibration nkhaus:
Lub photocell thiab ammeter yuav tsum tau rov calibrated thaum lawv hloov; lub ntsuas hluav taws xob yuav tsum rov ntsuas dua tom qab siv lub sijhawm (feem ntau 1-2 zaug hauv ib xyoos); lub high-precision illuminance meter yuav calibrated nrog lub teeb siv tus qauv teeb; nthuav Cov calibration ntau yam ntawm lub illuminance meter yuav hloov qhov kev ncua deb r, los yog xaiv txawv qauv teeb, thiab xaiv ib tug me me galvanometer.
