Yuav Ua Li Cas Ntsuas Diode Polarity thiab Mob Nrog Multimeter
① Zener diode.
Ib qho hluav taws xob tswj hluav taws xob diode yog ib hom diode uas ua haujlwm hauv cheeb tsam rov qab tawg thiab muaj kev ua haujlwm ntawm stabilizing voltage. Kev ntsuas ntawm nws cov polarity thiab kev ua haujlwm zoo ib yam li cov diodes zoo tib yam, tab sis qhov txawv yog tias thaum siv Rxlk hom multimeter los ntsuas lub diode, nws qhov rov qab tsis kam yog ntsuas kom siab heev. Lub sijhawm no, thaum hloov lub multimeter mus rau Rx10k hom, yog hais tias tus multimeter pointer deviates ho mus rau sab xis, uas yog, tus nqi rov qab kuj txo qis, ces lub diode yog ib tug voltage regulator diode; Yog tias qhov rov qab ua haujlwm tseem tsis tau hloov pauv, nws qhia tau hais tias lub diode yog ib qho diode tsis tu ncua, tsis yog qhov ntsuas hluav taws xob diode. Lub hauv paus ntsiab lus ntawm kev ntsuas hluav taws xob hluav taws xob diode yog qhov hluav taws xob sab hauv hluav taws xob hauv Rxlk ntau yam ntawm multimeter yog qhov qis, uas feem ntau tsis ua rau kev puas tsuaj ntawm cov diodes zoo tib yam thiab cov hluav taws xob hluav taws xob, yog li qhov ntsuas rov qab ua haujlwm siab heev. Thaum lub multimeter hloov mus rau Rx10k hom, lub roj teeb voltage nyob rau hauv lub multimeter yuav siab heev, ua rau lub voltage regulator diode muaj kev cuam tshuam rov qab, uas ua rau ib tug tseem ceeb txo nyob rau hauv nws rov qab tsis kam. Raws li qhov rov qab tawg qhov hluav taws xob ntawm cov diodes zoo tib yam yog siab dua li ntawm cov tswj hluav taws xob, cov diodes zoo tib yam tsis tawg thiab lawv qhov rov qab ua haujlwm tseem siab.
② Lub teeb Emitting Diode (LED).
Lub teeb emitting diode yog ib hom tshwj xeeb ntawm diode uas hloov hluav taws xob rau hauv lub teeb lub zog. Nws yog ib yam tshiab ntawm lub teeb txias qhov chaw uas feem ntau siv nyob rau hauv cov khoom siv rau qib qhia, analog zaub, thiab lwm yam kev siv. Nws feem ntau yog ua los ntawm cov khoom siv semiconductors xws li arsenide thiab phosphide. Cov xim emission ntawm lub teeb-emitting diodes feem ntau yog nyob ntawm cov khoom siv ntawm cov khoom siv semiconductor, thiab tuaj yeem tawm plaub hom teeb pom kev zoo: liab, txiv kab ntxwv, daj, ntsuab, thiab lwm yam. Lub casing ntawm lub teeb-emitting diode yog pob tshab, thiab cov xim ntawm lub casing qhia nws cov xim emission. Lub teeb emitting diodes khiav lag luam nyob rau hauv pem hauv ntej cheeb tsam, thiab lawv rau pem hauv ntej conduction (tig-rau) kev khiav hauj lwm voltage yog siab tshaj li cov zoo tib yam diodes. Qhov loj dua qhov kev thov rau pem hauv ntej voltage, qhov ci ntsa iab LED yuav tawm lub teeb. Txawm li cas los xij, nws yuav tsum tau sau tseg thaum siv tias qhov kev thov rau pem hauv ntej voltage yuav tsum tsis txhob tshaj qhov siab tshaj plaws kev khiav hauj lwm tam sim no ntawm LED kom tsis txhob hlawv tawm lub raj. Txoj kev tshawb nrhiav rau lub teeb-emitting diodes feem ntau yog siv Rx10k ntau ntawm ib lub multimeter, thiab nws txoj kev ntsuas thiab kev txiav txim siab ua haujlwm zoo ib yam li cov diodes zoo tib yam. Tab sis lub rau pem hauv ntej thiab thim rov qab tsis kam ntawm lub teeb-emitting diodes yog loj dua li ntawm cov diodes zoo tib yam. Thaum ntsuas qhov kev tiv thaiv pem hauv ntej ntawm lub teeb-emitting diode, me ntsis lub teeb emission tshwm sim tuaj yeem pom.
③ Photodiode.
Photodiode, tseem hu ua photodiode, yog ib hom tshwj xeeb ntawm diode uas hloov lub teeb lub zog rau hauv lub zog hluav taws xob. Nws lub casing muaj lub qhov rais embedded nrog iav kom yooj yim txais kev kaj. Lub photodiode ua haujlwm hauv cheeb tsam rov qab ua haujlwm. Thaum tsis muaj lub teeb, photodiodes, zoo li cov diodes zoo tib yam, muaj qhov rov qab me me tam sim no (feem ntau tsawg dua 0.1 uA) thiab qhov rov qab siab ntawm phototubes (tshaj kaum ntawm megaohms); Thaum illuminated, qhov rov qab tam sim no nce ntau thiab qhov rov qab tsis kam txo qis (los ntawm ntau txhiab ohms mus rau kaum tawm txhiab ohms), uas yog, qhov rov qab tam sim no (paub tias yog photocurrent) yog proportional rau lub illumination. Photodiodes tuaj yeem siv los ntsuas lub teeb thiab tuaj yeem ua lub zog siv hluav taws xob (photovoltaic cell). Nws yog dav siv los ua ib feem hauv optoelectronic tswj systems. Txoj kev tshawb pom ntawm photodiodes yog qhov pib zoo ib yam li cov diodes zoo tib yam. Qhov txawv yog tias muaj qhov sib txawv tseem ceeb hauv kev rov qab ua haujlwm ntawm cov teeb pom kev zoo thiab tsis muaj teeb meem. Yog tias qhov ntsuas ntsuas tsis sib txawv, nws qhia tau tias lub photodiode puas lossis tsis yog lub teeb-emitting diode.
