Taw qhia rau Cov Kev Tiv Thaiv ntawm Illuminance Meter
Lub Teeb Meter Ceev faj
1. Photovoltaic hlwb siv selenium (Se) photocells los yog silicon (Si) photocells nrog zoo linearity; lawv tseem muaj peev xwm tswj tau zoo stability thiab siab rhiab heev tom qab ua hauj lwm ntev; Thaum E yog siab, xaiv lub siab sab hauv photocells, thiab lawv qhov rhiab heev yog qhov qis thiab kab zoo, tsis yooj yim puas los ntawm lub teeb muaj zog.
2. Muaj V (λ) kho lim sab hauv, uas yog tsim rau lub teeb pom kev zoo nrog cov xim sib txawv, thiab qhov yuam kev me me
3. Ntxiv ib cosine lub kaum sab xis compensator (opalescent iav los yog dawb yas) nyob rau hauv pem hauv ntej ntawm lub photocell vim hais tias thaum lub teeb meem lub kaum sab xis loj, lub photocell deviates los ntawm txoj cai cosine.
4. Lub illuminance meter yuav tsum ua hauj lwm ntawm los yog nyob ze ntawm chav tsev kub (photocell drift hloov nrog kub)
Calibration ntawm Lux Meter:
Calibration txoj cai:
Cia Ls teeb lub photocell vertically → E=I/r2, hloov r kom tau tus nqi photocurrent nyob rau hauv txawv illuminance, hloov lub teev tam sim no mus rau hauv lub illuminance scale los ntawm 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 qhov sib txawv illuminance, thiab ua rau qhov hloov pauv ntawm photocurrent i thiab illuminance E, uas yog, calibration nkhaus ntawm lub illuminance meter. Los ntawm qhov no, lub dial ntawm lub illuminance meter tuaj yeem muab faib ua
Calibration ntawm lux meters
Cov yam ntxwv cuam tshuam rau calibration nkhaus:
Lub photocell thiab galvanometer yuav tsum tau rov ntsuas dua thaum lub photocell thiab galvanometer 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; Lub calibration ntau yam ntawm lub illuminance meter tuaj yeem hloov pauv los ntawm qhov kev ncua deb r, thiab cov teeb pom kev sib txawv kuj tuaj yeem xaiv, thiab ib qho ammeter me me tuaj yeem xaiv.
