Luminometer - Calibration ntawm Luminometers:
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 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 qhov chaw teeb pom kev zoo, hloov qhov nrug l ntawm photocell thiab cov teeb pom kev zoo, sau cov ntawv nyeem ntawm lub galvanometer ntawm txhua qhov kev ncua deb, thiab suav cov illuminance E los ntawm txoj cai inverse square. ntawm kev ncua deb E=I/r2, los ntawm A series ntawm photocurrent qhov tseem ceeb i nrog sib txawv illuminance tuaj yeem tau txais, uas tuaj yeem siv los ua qhov hloov pauv ntawm photocurrent i thiab illuminance E, uas yog calibration nkhaus ntawm lub illuminometer.
Yam tseem ceeb uas cuam tshuam rau calibration nkhaus:
Lub photocell thiab galvanometer yuav tsum tau rov calibrated thaum lawv hloov; lub illuminometer yuav tsum tau rov ntsuas dua tom qab siv lub sijhawm (feem ntau 1-2 zaug hauv ib xyoos); high-precision illuminometers tau calibrated nrog lub teeb siv tus qauv teeb; Lub calibration ntau yam ntawm lub illuminance meter tuaj yeem hloov qhov kev ncua deb r, thiab cov txheej txheem sib txawv kuj siv tau, thiab ib qho me me tam sim no meter tuaj yeem xaiv.
Illuminance Meter - Cov kauj ruam siv lub ntsuas hluav taws xob:
① Tig lub zog.
② Qhib lub hau ntawm lub photodetector thiab tso lub photodetector kab rov tav nyob rau hauv txoj hauj lwm ntsuas.
③ Xaiv lub iav ntsuas qhov tsim nyog.
Yog tias tsuas yog "1" tshwm sim ntawm sab laug kawg ntawm cov zaub, nws txhais tau hais tias lub teeb pom kev zoo dhau lawm, thiab koj yuav tsum nias qhov tseem ceeb (⑧ tus yuam sij) los kho qhov ntsuas qhov sib npaug.
④ Lub illuminance meter pib ua hauj lwm thiab qhia cov illuminance tus nqi ntawm cov zaub screen.
⑤ Cov ntaub ntawv tso tawm ntawm lub vijtsam hloov pauv tas li. Thaum cov ntaub ntawv tso tawm yog qhov ruaj khov, nias lub khawm tuav kom kaw cov ntaub ntawv.
⑥ Nyeem thiab sau cov kev soj ntsuam pom hauv tus nyeem ntawv. Tus nqi pom zoo yog sib npaug rau tus lej pom hauv qhov kev nyeem ntawv muab faib los ntawm tus nqi ncua.
Piv txwv li: 500 yog tso tawm rau ntawm qhov screen, cov xwm txheej ntawm lub kaum sab xis yog "× 2000", thiab qhov ntsuas qhov pom kev yog 1000000lx, piv txwv li (500 × 2000).
⑦ Nias lub ntsuas phoo dua kom thim qhov kev nyeem ntawv ntsuas phoo.
⑧ Thaum txhua qhov kev soj ntsuam, peb nyeem sib law liag thiab kaw.
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 tso rau hauv lub thawv.
Lub Teeb Meter - Lub Teeb Meter General Requirements:
● Me me thiab lub teeb yuag (Compact Size, Lub teeb yuag)
Cov cib fim rau cov ntsuas hluav taws xob siv tau yog qhov dav heev, thiab lawv feem ntau siv rau ntau qhov chaw. Yog li ntawd, portable illuminance meters nrog me me thiab lub teeb yuag yog lub prerequisites rau illuminance meters.
● Qhov tseeb﹝ Muaj tseeb﹞
Seb lub illuminance meter yog qhov zoo los yog phem yog ze ze rau 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 teeb pom kev zoo illuminometer ntawm tus nqi tsim nyog. Feem ntau, qhov yuam kev yuav tsum tsis pub tshaj ± 15 feem pua.
● Xim Xaus ﹝ Xim Xim ﹞
Cov hom teeb pom kev zoo yog tag nrho-encompassing, ib txhia nyiam cov teeb liab siab siab nrog lub wavelengths ntev, los yog xiav-violet teeb nrog luv wavelengths xws li Daylight fluorescent teeb; kuj tseem muaj ntau qhov sib npaug sib npaug xws li cov qij incandescent, tib lub illuminometer yuav muaj qhov sib txawv me ntsis rau qhov sib txawv wavelengths. Sib txawv, yog li tsim nyog them nyiaj.
● Cosine Compensation﹝Cosine Compensation﹞
Peb txhua tus paub tias qhov ci ntsa iab ntawm qhov ci ntsa iab yog cuam tshuam nrog qhov xwm txheej ntawm lub teeb ci. Rau tib lub laj thawj, thaum ntsuas nrog lub illuminometer, lub sensor (Sensor) thiab qhov xwm txheej ntawm lub teeb ci yuav cuam tshuam rau kev nyeem ntawv tus nqi ntawm lub illuminometer. Yog li seb lub illuminometer zoo muaj qhov ua haujlwm ntawm cosine nyiaj tsis tuaj yeem tsis quav ntsej.
