Uma kukhona ama-conductor amabili ahlukene noma i-semiconductor A kanye no-B ukuze kwakhiwe i-loop engu-A, iziphetho zayo zombili zixhunyiwe, inqobo nje uma izinga lokushisa lama-node amabili lihlukile, izinga lokushisa lokugcina lika-T, elibizwa ngokuthi ukuphela noma umsebenzi wokuphela oshisayo, ngakolunye. izinga lokushisa lokugcina T0, eyaziwa ngokuthi ukuphela kwamahhala (owaziwa nangokuthi uhlangothi lwereferensi) noma ukuphela okubandayo, isifunda sizokhiqiza amandla e-electromotive, isiqondiso nobukhulu bamandla e-electromotive kuhlobene nezinto zomqhubi kanye nezinga lokushisa labathintana ababili. .Lesi simo sibizwa ngokuthi umphumela we-thermoelectric, izinhlobo ezimbili zesekethe ye-conductor eyaziwa ngokuthi "i-thermocouple", eyakhiwe ama-conductor amabili abizwa ngokuthi i-electrode "eshisayo", amandla e-electromotive abizwa ngokuthi "i-thermoelectric emfs.
I-Thermoelectric emfs yakhiwe izingxenye ezimbili zamandla e-electromotive, ingxenye yesibili ye-conductor contact electromotive force, enye ingxenye i-conductor eyodwa yamandla omehluko wokushisa we-electromotive.
Usayizi we-thermocouple loop thermoelectric emfs, kuphela ngokwakhiwa kwezinto zokuqhuba i-thermocouple ezihlobene nezinga lokushisa labathintana ababili, futhi akuhlangene nosayizi womumo we-thermocouple.Ngemuva kokuthi i-thermocouple ilungise izinto ezimbili zama-electrode, izinga lokushisa lokuxhumana t nama-thermoelectric emfs angu-t0 amabili.Umsebenzi awulungile.
Lesi sibalo sisetshenziswe kabanzi esilinganisweni sangempela sezinga lokushisa.Ngenxa yokuphela okubandayo kwe-t0 njalo, okukhiqizwa yi-thermocouple thermoelectric emfs kuphela (isilinganiso) sokushisa kokushisa okushisayo kuyahlukahluka, i-emfs ye-thermoelectric ihambisana nokushisa okuthile.Uma nje sisebenzisa indlela yokulinganisa i-emfs ye-thermoelectric ingafinyelela injongo yokulinganisa izinga lokushisa.
Ukulinganisa izinga lokushisa kwe-Thermocouple kuyisimiso esiyisisekelo sezinhlobo ezimbili zezithako ezihlukene zokwakheka kwempahla ye-loop conductor evaliwe, lapho i-gradient yokushisa isemikhawulweni yomibili, iluphu izoba nokudlula kwamandla kagesi, okwakukhona phakathi kwamandla e-electromotive kuzo zombili iziphetho - i-thermoelectric emf , lokhu okubizwa ngokuthi i-Seebeck effect (umphumela we-Seebeck).Izingxenye ezimbili ezihlukene ze-homogeneous conductor electrode njengokushisa, izinga lokushisa liphakeme kakhulu emsebenzini ekupheleni kokuphela, umkhawulo owodwa wokushisa ophansi njengokuphela kwamahhala, ngokuvamile umkhawulo wamahhala ngaphansi kwezinga lokushisa elihlala njalo.Ngokusho kwe-emf ye-thermoelectric njengomsebenzi wokushisa, ithebula lezinkomba ze-thermocouple;Ithebula lenkomba izinga lokushisa lokuphela lamahhala elingu-0 ℃, ngaphansi kwesimo sama-thermocouples ahlukene anethebula lenkomba elihlukile.
Ukufinyelela ku-loop ye-thermocouple lapho impahla yesithathu yensimbi, othintana nabo ababili ezingeni lokushisa elifanayo inqobo nje uma impahla, ekhiqizwa i-thermocouple thermoelectric isethwe ukuze ihlale ifana, engathinteki ukufinyelela kwensimbi yesithathu ku-loop.Ngakho-ke, lapho isilinganiso sokushisa kwe-thermocouple, singaxhunywa kuthuluzi lokulinganisa, likalwa ngemva kwe-emfs ye-thermoelectric, lingakwazi izinga lokushisa le-medium elinganisiwe.I-Thermocouple yokulinganisa izinga lokushisa ukuya ekugcineni okubandayo (isiphelo sokulinganisa sokuphela okushisayo, ekupheleni komthofu oxhunywe kwisekhethi yokulinganisa ibizwa ngokuthi i-cold junction) izinga lokushisa ligcinwa lingaguquki, usayizi wamandla kagesi we-thermoelectric kanye nezinga lokushisa elilinganiselwe ebudlelwaneni bengxenye ethile.Uma ukala, izinga lokushisa elibandayo liyashintsha (imvelo), lizothinta kakhulu ukunemba kokulinganisa.Thatha isenzo esinxephezelweni esibandayo ngenxa yomthelela wokushintsha kwezinga lokushisa elibandayo kubizwa ngokuthi isinxephezelo sendawo ebandayo ye-thermocouple sijwayelekile.Ixhunywe ensimbini yokulinganisa ngomqhubi wesinxephezelo okhethekile.
Indlela yokubala yesinxephezelo sendawo ebandayo ye-Thermocouple:
Ukusuka ku-millivolt kuya kumazinga okushisa: linganisa izinga lokushisa elibandayo nokuguqulwa kwamanani ahambisanayo e-millivolt, amanani we-millivolt nge-thermocouple, ukuguqulwa kwezinga lokushisa;
Kusukela ezingeni lokushisa kuya ku-millivolt: linganisa izinga lokushisa langempela kanye nezinga lokushisa elibandayo kanye nokuguqulwa kwamanani e-millivolt, ngokulandelana, ngemva kokukhipha amanani we-millivolt, izinga lokushisa elisheshayo.
Isikhathi sokuthumela: Dec-04-2020