Kev taw qhia thiab kev ua haujlwm ntawm illuminance meter
1. Illuminance meter:
Lub illuminance meter (los yog lux meter) yog ib qho cuab yeej tshwj xeeb hauv kev ntsuas luminosity thiab brightness. Yog ntsuas lub teeb siv (illuminance)
Nws yog qhov degree uas cov khoom yog illuminated, uas yog, qhov piv ntawm cov luminous flux tau los ntawm qhov chaw ntawm cov khoom mus rau qhov chaw illuminated. Lub ntsuas hluav taws xob feem ntau yog tsim los ntawm selenium photocell lossis silicon photocell thiab microammeter.
2. 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 yog feem ntau siv.
