Dab tsi yog qhov kev faib tawm ntawm illuminometers
1. Visual illuminometer: siv tsis yooj yim, tsis muaj tseeb, tsis tshua siv
2. Photoelectric illuminometer: Muaj pes tsawg leeg thiab kev siv yuav tsum tau siv feem ntau siv selenium photocell illuminometer thiab silicon photocell illuminometer:
Muaj pes tsawg leeg: microampere meter, hloov pob qhov rooj, xoom hloov kho, lub davhlau ya nyob twg ncej, photocell, V (λ) Kho qhov sib xyaw ntawm cov lim dej thiab lwm yam khoom siv. Feem ntau siv selenium (Se) photocell lossis silicon (Si) photocell illuminometer, tseem hu ua lux meter
2. Cov kev cai siv:
① Photocells yuav tsum siv selenium (Se) photocells lossis silicon (Si) photocells nrog zoo linearity; Ua kom muaj kev ruaj ntseg zoo thiab muaj kev nkag siab zoo txawm tias tom qab ua haujlwm ntev; Thaum siv high E, xaiv photocells nrog siab sab hauv tsis kam, uas muaj tsawg rhiab heev thiab zoo linearity, thiab tsis yooj yim puas los ntawm lub teeb muaj zog irradiation.
② Kev them nyiaj sab hauv nrog V (λ) Kho lub lim, haum rau kev siv lub teeb pom kev ntawm lub teeb pom kev zoo heterochromatic, nrog qhov yuam kev me me
③ Yog vim li cas ntxiv ib cosine kaum compensator (milky dawb iav los yog dawb yas) nyob rau hauv pem hauv ntej ntawm lub photocell yog hais tias thaum lub teeb meem lub kaum sab xis loj, lub photocell deviates los ntawm txoj cai cosine.
④ Lub illuminometer yuav tsum ua haujlwm ntawm lossis ze ntawm chav tsev kub (qhov drift ntawm photocell hloov nrog kub)
Calibration ntawm illuminometer:
Calibration txoj cai: Ua Ls vertically irradiate lub photocell → E=I / r2, hloov r kom tau cov photocurrent values nyob rau hauv txawv illuminances, 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 siv hluav taws xob, ntawm qhov chaw ua haujlwm zoo ib yam li lub teeb pom kev, hloov qhov deb l ntawm lub photocell thiab cov teeb pom kev zoo, sau cov ntawv nyeem ntawm ammeter ntawm txhua qhov kev ncua deb, thiab suav cov illuminance E siv lub inverse nrug square. txoj cai E=I/r2. Los ntawm qhov no, ib tug series ntawm txawv illuminance photocurrent qhov tseem ceeb kuv yuav tau txais, thiab cov variation nkhaus ntawm photocurrent i thiab illuminance E yuav tau kos, uas yog lub calibration nkhaus ntawm lub illuminometer. Qhov no tuaj yeem muab piv rau lub xov tooj ntawm lub illuminometer, uas yog qhov calibration nkhaus ntawm lub illuminometer.
Cov yam ntxwv cuam tshuam rau calibration nkhaus:
Thaum hloov photocells thiab ammeters, recalibration yog yuav tsum tau; Tom qab siv lub illuminometer rau ib lub sij hawm, nws yuav tsum tau recalibrated (feem ntau calibrated 1-2 zaug hauv ib xyoos); Lub high-precision illuminometer yuav calibrated siv lub teeb siv lub teeb txheem; Nthuav cov calibration ntau yam ntawm lub illuminometer tuaj yeem hloov qhov kev ncua deb r, los yog cov qauv sib txawv tuaj yeem xaiv tau, siv lub ammeter me me.
