stacked semiconductor
Nws yog tsim los ntawm lub hauv paus ntsiab lus hais tias cov conductivity ntawm ib co hlau oxide semiconductor cov ntaub ntawv hloov nrog cov kev hloov ntawm ambient gas muaj pes tsawg leeg ntawm ib tug tej yam kub. Piv txwv li, lub ntsuas dej cawv tau npaj los ntawm kev siv lub hauv paus ntsiab lus tias qhov kev tiv thaiv ntawm tin dioxide yuav txo qis thaum nws ntsib cov roj cawv ntawm qhov kub thiab txias.
combustion
Hom sensor no npaj cov txheej txheem kub resistant catalyst rau saum npoo ntawm platinum resistor. Ntawm qhov kub thiab txias, cov roj combustible catalyzes combustion ntawm nws qhov chaw. Lub combustion yog tshwm sim los ntawm qhov kub nce ntawm lub platinum resistor, qhov kev hloov tsis kam, thiab tus nqi hloov pauv yog qhov concentration ntawm cov roj combustible. muaj nuj nqi.
thermal conductivity pas dej ua ke
Txhua lub roj muaj nws tus kheej tshwj xeeb thermal conductivity. Thaum lub thermal conductivity ntawm ob los yog ntau dua gases txawv heev, lub thermal conductivity caij yuav siv tau los paub qhov txawv cov ntsiab lus ntawm ib qho ntawm cov khoom. Cov sensors no tau siv rau kev tshawb nrhiav cov pa roj carbon dioxide, nrhiav kom pom cov pa roj carbon dioxide, thiab nrhiav kom pom cov methane siab.
Electrochemical
Ib feem ntawm nws cov nplaim taws, muaj kuab lom thiab tsis zoo yog cov khoom siv hluav taws xob thiab tuaj yeem ua rau electrochemically oxidized lossis txo. Siv cov tshuaj tiv thaiv no, nws muaj peev xwm paub qhov txawv ntawm cov khoom siv roj thiab kuaj xyuas cov pa roj. Electrochemical gas sensors poob rau hauv ntau yam subcategories:
(1) Lub hom phiaj tseem ceeb ntawm cov roj teeb sensor (tseem hu ua: Gavoni cell type gas sensor, tseem hu ua roj cell type gas sensor, tseem hu ua spontaneous roj teeb hom roj sensor), lawv txoj cai yog tib yam li lub xov tooj ntawm tes qhuav peb siv, tab sis, carbon-manganese electrodes ntawm lub roj teeb tau hloov los ntawm cov roj electrodes. Nyob rau hauv cov ntaub ntawv ntawm ib tug oxygen sensor, oxygen yog txo nyob rau hauv lub cathode thiab electrons ntws los ntawm lub ammeter mus rau lub anode, qhov twg hlau lead yog oxidized. Qhov loj ntawm qhov tam sim no ncaj qha ntsig txog qhov concentration ntawm oxygen. Qhov ntsuas no tuaj yeem kuaj pom cov pa oxygen, sulfur dioxide, chlorine, thiab lwm yam.
(2) Tsis tas li muaj peev xwm electrolytic cell type gas sensor, qhov sensor no zoo heev rau kev kuaj xyuas cov pa roj, nws cov ntsiab lus txawv ntawm galvanic cell type sensor, nws cov tshuaj tiv thaiv electrochemical tshwm sim nyob rau hauv lub zog ntawm tam sim no, uas yog ib qho tseeb coulometric sensor. . Lub sensor no tau siv dav hauv kev tshawb nrhiav cov pa roj carbon monoxide, hydrogen sulfide, hydrogen, ammonia, hydrazine, thiab lwm yam gases, thiab yog lub ntsiab lus tseem ceeb rau kev tshawb nrhiav cov pa phem thiab cov pa phem uas twb muaj lawm.
(3) Concentration roj teeb hom roj sensor, cov pa roj nrog electrochemical kev ua spontaneously tsim ib tug concentration electromotive quab yuam ntawm ob sab ntawm lub electrochemical cell, thiab qhov loj ntawm lub electromotive quab yuam muaj feem xyuam rau cov concentration ntawm cov roj. Oxygen sensor, khoom electrolyte carbon dioxide sensor.
(4), limiting tam sim no hom roj sensor, muaj ib tug sensor rau ntsuas oxygen concentration siv lub hauv paus ntsiab lus hais tias lub limiting tam sim no nyob rau hauv electrochemical cell muaj feem xyuam rau lub carrier concentration los npaj ib tug oxygen (gas) concentration sensor, uas yog siv rau oxygen. nrhiav pom nyob rau hauv tsheb thiab molten steel. Oxygen concentration nrhiav pom.
