Cov kev cai dav dav rau lub teeb 'meter':
● Compact Size, Lub teeb yuag
Illuminance meters muaj ntau yam kev siv thiab feem ntau siv nyob rau hauv ntau qhov chaw. Yog li ntawd, portable, me me thiab lub teeb yuag yog lub prerequisites rau ib tug illuminance meter.
● Qhov tseeb﹝ Muaj tseeb﹞
Txawm hais tias lub teeb ntsuas qhov zoo lossis qhov tsis zoo muaj kev sib raug zoo nrog nws qhov tseeb. Ntawm chav kawm, nws kuj yog ze ze rau nws tus nqi. Yog li ntawd, nws yog ib qho tsim nyog yuav tau yuav lub ntsuas hluav taws xob siab kom raug ntawm tus nqi tsim nyog. Feem ntau, nws yog qhov tsim nyog kom muaj qhov yuam kev tsis ntau tshaj ± 15%.
● Xim Xim ﹝ Xim Xaus ﹞
Cov hom teeb pom kev zoo yog tag nrho-encompassing. Qee qhov tsom mus rau cov teeb liab siab siab nrog lub teeb ntev dua, lossis cov teeb xiav-violet nrog luv luv wavelengths xws li Daylight fluorescent teeb. Kuj tseem muaj qhov sib npaug sib npaug xws li cov qij taws teeb. Tib lub illuminance meter yuav muaj qhov sib txawv me ntsis rau qhov sib txawv wavelengths. sib txawv, yog li tsim nyog them nyiaj.
● Cosine Compensation ﹝ Cosine Compensation ﹞
Raws li peb txhua tus paub, qhov ci ntsa iab ntawm qhov illuminated nto yog cuam tshuam nrog qhov xwm txheej ntawm lub teeb ci. Ib yam li ntawd, thaum ntsuas nrog lub teeb ntsuas, qhov xwm txheej ntawm lub ntsuas ntsuas (Sensor) thiab lub teeb pom kev zoo yuav cuam tshuam rau kev nyeem ntawv tus nqi ntawm lub teeb ntsuas. Yog li ntawd, seb lub ntsuas hluav taws xob zoo puas muaj lub luag haujlwm ntawm cosine them nyiaj tsis tuaj yeem tsis quav ntsej.
Calibration ntawm lub teeb meter:
Cia Ls teeb lub photocell vertically → E=I/r2. Los ntawm kev hloov r, tus nqi photocurrent nyob rau hauv txawv illumination tuaj yeem tau txais. Qhov ntsuas tam sim no tau hloov mus rau hauv qhov ntsuas qhov pom kev raws li kev sib raug zoo ntawm E thiab i.
Txoj kev Calibration:
Siv lub teeb siv hluav taws xob siv hluav taws xob hloov qhov kev ncua deb l ntawm lub xov tooj ntawm tes photovoltaic thiab tus qauv teeb ntawm qhov kwv yees ua haujlwm nyob deb ntawm qhov chaw teeb pom kev zoo, sau cov ntawv nyeem ntawm ammeter ntawm txhua qhov kev ncua deb, thiab suav cov illuminance E raws li qhov rov qab square. Txoj cai nyob deb E=I/r2, raws li Qhov no tuaj yeem tau txais cov txiaj ntsig photocurrent i nrog cov teeb pom kev sib txawv, thiab kos cov kev hloov pauv ntawm photocurrent i thiab illuminance E, uas yog qhov ntsuas nkhaus ntawm lub ntsuas hluav taws xob. Los ntawm qhov no, calibration nkhaus ntawm lub illuminance meter yuav xam tau los ntawm kev faib lub dial ntawm lub illuminance meter.
Cov yam ntxwv cuam tshuam rau calibration nkhaus:
Photocells thiab galvanometers yuav tsum tau recalibrated thaum hloov; lub illuminance meter yuav tsum tau recalibrated tom qab siv rau ib lub sij hawm ntawm lub sij hawm (feem ntau nws yuav tsum tau calibrated 1-2 zaug ib xyoos); high-precision illuminance meters 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 txawv standard teeb yuav siv tau, thiab ib tug me me-ntau galvanometer yuav siv tau.
