Lub teeb Sensor: Lub teeb Sensor yog dab tsi?
Dab tsi yog lub ntsiab lus ntawm lub teeb sensor
Ib daim ntawv ntawm photodetector uas pom lub teeb yog lub teeb sensor, tseem hu ua photosensor. Txhawm rau ntsuas qhov illuminance, hnov mob rau qhov sib txawv ntawm qhov ntau ntawm lub teeb tau txais, lossis hloov lub teeb rau hauv hluav taws xob, siv ntau hom teeb pom kev zoo.
Hom teeb pom kev zoo li cas muaj?
Photodiodes, photoresistors, phototransistors, thiab hnub ci lub teeb sensors yog ntau yam ntawm lub teeb sensors. Cov khoom no tuaj yeem siv rau hauv tej yaam num xws li lub teeb pom kev ntawm lub xov tooj ntawm tes, automated sab nrauv illumination, sensors sib thooj, thiab lub zog tauj dua tshiab.
Lub teeb hloov mus rau hauv hluav taws xob los ntawm photodiodes. Zoo ib yam li cov diodes raug, lawv yog cov khoom siv pn junction. Ib hom p-hom semiconducting khoom thiab n-hom semiconducting khoom ua rau pn junction mechanism. Vim muaj qhov seem ntawm electron qhov nyob rau hauv cov khoom, lub "p" stands rau "zoo," thiab "n" stands rau "tsis zoo," vim muaj ntau tshaj ntawm electrons.
Qhov no txhais tau hais tias tsuas muaj ib txoj hauv kev uas tam sim no tuaj yeem hla ciam teb. Cov electron qhov khub no tsim nyob rau hauv ib lub photodiode thaum lub teeb lub zog raug ntes los ntawm cov khoom. Avalanche photodiode yog lwm lo lus uas zoo sib xws.
Qhov tsis kam ntawm photoresistors, tseem hu ua lub teeb-dependent resistors lossis LDRs, txo qis rau qhov ntau ntawm lub teeb tau txais. Conductivity nce raws li electron qhov khub yog tsim los ntawm lub teeb, uas ua rau impedance poob.
Zoo ib yam li cov transistors ib txwm, phototransistors hloov lossis txhim kho impulses, nrog rau tam sim no siv rau cov terminals raug tsim los ntawm raug lub teeb. Lub zog sib sau ua ke yog txheej txheem ntawm tig lub teeb rau hauv lub zog siv photovoltaic (los yog hnub ci) hlwb. Los ntawm lub semiconducting Cheebtsam ntawm lub cell lub photovoltaic nyhuv, voltage thiab hluav taws xob tam sim no yog tsim.
Lub teeb detectors ua haujlwm li cas?
Cov nyhuv photoelectric yog li cas lub teeb pom kev ua haujlwm. Lub teeb muaj peev xwm ua tau zoo li photon, hom particle. Lub zog ntawm lub teeb yog coj los ntawm cov electrons thaum lub photon ntaus hlau nto ntawm lub teeb sensor, boost lawv lub zog kinetic thiab ua kom lawv tawm ntawm cov khoom.
Cov hluav taws xob tam sim no yog qhov tshwm sim ntawm cov atoms 'kev txav thiab, yog li, ntawm tus nqi. Nyob rau hauv lub teeb yog ntes los ntawm electrons, elevating lawv lub zog theem, cov nyhuv photovoltaic yog piv rau cov nyhuv photoelectric. Cov electrons raug tshem tawm tag nrho los ntawm cov khoom hauv cov nyhuv photoelectric. Cov electrons nyob rau hauv cov nyhuv photovoltaic yog energized los ntawm valence band rau hauv conduction band thaum tseem muaj nyob rau hauv tib yam khoom.
