Tshem tawm cov hom roj sensors siv nyob rau hauv kev nyab xeeb teb
Gas sensors feem ntau yog siv los kuaj xyuas cov roj tshwj xeeb, ntsuas seb cov roj puas muaj nyob ze ntawm lub sensor lossis cov ntsiab lus ntawm huab cua ze ntawm lub sensor. Yog li ntawd, gas sensors feem ntau tseem ceeb heev nyob rau hauv kev ruaj ntseg systems. Cov sensors no tuaj yeem muab cov ntaub ntawv hais txog cov khoom siv hluav taws xob, hluav taws xob, thiab cov pa phem rau kev nyab xeeb, nrog rau kev noj cov pa oxygen thiab qhov feem ntawm cov pa roj carbon dioxide hauv cheeb tsam.
Cov pa roj carbon monoxide muaj xws li electrochemical gas sensors, catalytic combustion gas sensors, semiconductor gas sensors, infrared gas sensors, etc. Vim muaj cov ntsiab lus sib txawv thiab cov qauv, ntau hom sensors muaj qhov sib txawv, siv txoj kev, siv tau gases, thiab siv sij hawm. Niaj hnub no, kuv yuav teev cov hom roj sensors rau txhua tus, vam tias yuav pab tau.
Electrochemical gas sensor
Feem ntau ntawm cov nplaim hluav taws kub hnyiab, muaj kuab lom thiab tsis zoo, xws li hydrogen sulfide, nitric oxide, nitrogen dioxide, sulfur dioxide, carbon monoxide, thiab lwm yam, muaj cov tshuaj electrochemical thiab tuaj yeem ua rau electrochemically oxidized lossis txo. Los ntawm kev siv cov tshuaj tiv thaiv no, cov roj muaj pes tsawg leeg tuaj yeem paub qhov txawv thiab cov roj concentration tuaj yeem kuaj pom. Electrochemical sensors yog raws li txoj cai no.
Electrochemical sensors muaj ntau yam subcategories:
Cov roj teeb tseem ceeb hom roj sensor
Hom sensor no tseem hu ua Gavoni cell type gas sensor, los yog roj cell hom roj sensor lossis ib lub xov tooj ntawm tes hom roj sensor. Lawv lub hauv paus ntsiab lus yog tib yam li cov roj teeb qhuav uas peb siv txhua hnub, tshwj tsis yog tias cov pa roj carbon manganese electrode ntawm lub roj teeb tau hloov los ntawm cov roj electrode. Noj cov pa oxygen sensor ua piv txwv, cov pa oxygen cathode raug txo, thiab cov hluav taws xob ammeter ntws mus rau lub anode, qhov twg cov hlau lead yog oxidized. Yog li ntawd, qhov loj ntawm tam sim no yog ncaj qha ntsig txog cov pa oxygen concentration. Lub sensor no tuaj yeem ntes cov pa roj xws li oxygen, sulfur dioxide, chlorine, thiab lwm yam.
Tsis tu ncua muaj peev xwm electrolytic cell type gas sensor
Hom sensor no muaj txiaj ntsig zoo hauv kev txheeb xyuas qhov txo cov pa roj carbon monoxide, thiab nws lub hauv paus ntsiab lus txawv ntawm cov roj teeb thawj hom sensor. Electrochemical cov tshuaj tiv thaiv tshwm sim nyob rau hauv kev quab yuam tam sim no, ua rau nws muaj tseeb Coulomb tsom xam sensor. Lub sensor no tau ua tiav hauv kev tshawb nrhiav cov pa roj xws li carbon monoxide, hydrogen sulfide, hydrogen, ammonia, hydrazine, thiab tam sim no yog lub ntsiab lus tseem ceeb rau kev kuaj cov pa phem thiab cov pa phem.
Nco tseg: Coulomb tsom xam yog hais txog cov txheej txheem ntawm kev txiav txim siab cov ntsiab lus ntawm cov khoom ntsuas raws li Faraday txoj cai, raws li tus nqi hluav taws xob siv thaum lub sij hawm electrolysis.
Concentration roj teeb hom roj sensor
Hom sensor no muaj electrochemical kev ua si, thiab cov roj ntawm ob sab ntawm lub electrochemical roj teeb yuav spontaneously tsim ib tug concentration txawv electromotive quab yuam. Qhov loj ntawm lub zog electromotive muaj feem xyuam rau qhov concentration ntawm cov pa. Cov piv txwv ua tau zoo ntawm hom sensor no yog oxygen sensors rau tsheb thiab khoom electrolyte hom carbon dioxide detectors.
Tsis tshua muaj tam sim no hom roj sensor
Qhov no yog lub sensor rau ntsuas cov pa oxygen concentration, thiab nws txoj haujlwm ua haujlwm yog ua raws li cov pa oxygen twj tso kua mis ntawm zinc oxide khoom electrolyte ruaj khov. Qhov kev txwv tam sim no tau txais los ntawm kev tswj cov pa oxygen nkag mus rau cathode los ntawm cov pa diffusion. Hom sensor no yog tam sim no tsuas yog siv rau combustion tswj nyob rau hauv boilers, nrhiav kom tau oxygen concentration nyob rau hauv molten hlau, thiab oxygen nrhiav tau nyob rau hauv tsheb.
Semiconductor Gas Sensor
Semiconductor gas sensors siv cov oxidation thiab txo cov kev cuam tshuam ntawm cov roj nyob rau saum npoo ntawm semiconductors, uas ua rau muaj kev hloov pauv ntawm qhov tsis kam ntawm cov khoom rhiab:
Cov pa oxygen thiab lwm yam roj av uas nyiam adsorb tsis zoo ions hu ua oxidizing gases - electron txais gases;
Gases uas muaj qhov zoo ion adsorption nyiam, xws li hydrogen, carbon oxides, thiab cawv, hu ua txo cov pa roj - electron muab gases.
Thaum oxidizing (txo) gases yog adsorbed mus rau N (P) hom semiconductors, tus nqi nqa ntawm cov semiconductors txo (nce) thiab cov resistivity nce (qis); Adsorbed rau P (N) hom semiconductors, tus nqi thauj khoom ntawm cov khoom siv hluav taws xob nce (qis) thiab qhov kev tiv thaiv qis (nce). (Nws tuaj yeem pom tau tias oxidizing thiab txo cov semiconductors yog qhov sib txawv kiag li.) Yog li, cov khoom no tuaj yeem pom cov roj sib xws.
Semiconductor gas sensors tuaj yeem siv tau zoo los kuaj xyuas ntau cov pa roj xws li methane, ethane, propane, butane, cawv, formaldehyde, carbon monoxide, carbon dioxide, ethylene, acetylene, vinyl chloride, styrene, acrylic acid, thiab lwm yam. tshwj xeeb tshaj yog, hom no. sensor yog tus nqi qis thiab tuaj yeem ua tau raws li kev lag luam thiab kev xav tau ntawm pej xeem.
Disadvantages: Tsis muaj kev ruaj ntseg, muaj kev cuam tshuam rau ib puag ncig, thiab tsis tsim nyog rau kev siv nyob rau hauv qhov chaw nrog kev ntsuas kom raug.
