Ke loaʻa nā mea hoʻokele ʻokoʻa ʻelua a i ʻole semiconductor A a me B e hana i ka loop A, ua pili kona mau wēlau ʻelua, ʻoiai ʻokoʻa ka mahana o nā node ʻelua, ʻo ka wela wela o T, i kapa ʻia ka hopena a i ʻole ka wela wela, ma kekahi ʻO ka wela wela T0, i ʻike ʻia ʻo ka hopena manuahi (ʻike ʻia ʻo ka ʻaoʻao kuhikuhi) a i ʻole ka hopena anu, e hoʻopuka ke kaapuni i kahi mana electromotive, ʻo ke kuhikuhi a me ka nui o ka ikaika electromotive e pili ana i ka mea conductor a me ka mahana o ka pilina ʻelua. .Ua kapa ʻia kēia hanana ka hopena thermoelectric, ʻelua ʻano o ka conductor circuit i kapa ʻia ʻo "thermocouple", i haku ʻia e nā conductors ʻelua i kapa ʻia ʻo ka "hot" electrode, kapa ʻia ka ikaika electromotive "thermoelectric emfs.
Hoʻokumu ʻia ka Thermoelectric emfs i ʻelua ʻāpana o ka ikaika electromotive, ʻāpana ʻelua conductor contact electromotive force, ʻo ka ʻāpana ʻē aʻe he conductor hoʻokahi o ka ikaika electromotive ʻokoʻa.
ʻO ka nui o ka thermocouple loop thermoelectric emfs, aia wale nō me ka haku ʻana o nā mea conductor thermocouple e pili ana i ka mahana o ka pilina ʻelua, ʻaʻohe mea pili i ke ʻano nui o ka thermocouple.Ma hope o ka hoʻopaʻa ʻana o ka thermocouple i ʻelua mau mea electrode, pili ka wela t a me nā thermoelectric emfs ʻelua t0.He ʻilihune ka hana.
Ua hoohana nui ia keia hoohalike i ke ana wela maoli.Ma muli o ka hopena anu t0 mau, i hana ʻia e ka thermocouple thermoelectric emfs wale nō (ana) o ka wela wela wela like ʻole, pili ka thermoelectric emfs i kekahi wela.Ke hoʻohana nei mākou i ke ʻano o ke ana ʻana i nā emfs thermoelectric hiki ke hoʻokō i ke kumu o ke ana wela.
ʻO ke ana wela o ka Thermocouple ka loina kumu o nā ʻano mea like ʻole o ka hoʻokumu ʻana i nā mea conductor loop closed, i ka wā e hele ai ka gradient wela ma nā ʻaoʻao ʻelua, e hele ka loop loop i kahi au uila, aia ma waena o ka ikaika electromotive ma nā ʻaoʻao ʻelua - thermoelectric emf , ʻo kēia ka mea i kapa ʻia ʻo Seebeck effect (Seebeck effect).ʻElua mau ʻāpana like ʻole o ka electrode conductor homogeneous e like me ka wela, ʻoi aku ka kiʻekiʻe o ka mahana no ka hana ma ka hopena o ka hopena, hoʻokahi hopena o ka haʻahaʻa haʻahaʻa e like me ka hopena manuahi, maʻamau ka hopena ma lalo o kahi mahana mau.Wahi a ka thermoelectric emf ma ke ʻano he hana o ka mahana, ka papa kuhikuhi kuhikuhi thermocouple;ʻO ka papa kuhikuhi helu ʻana he wela hopena manuahi ma 0 ℃, ma lalo o ke kūlana o nā thermocouple like ʻole me ka papa kuhikuhi kuhikuhi ʻokoʻa.
Loaʻa i ka loop thermocouple i ka wā o ke kolu o nā mea metala, ʻo nā pilina ʻelua i ka mahana like me ka lōʻihi o ka mea, hana ʻia e ka thermocouple thermoelectric e hoʻonohonoho ʻia e noho like, ʻaʻole i hoʻopilikia ʻia e ke kolu o ka metala komo i ka loop.No laila, i ka wā o ke ana wela thermocouple, hiki ke hoʻopili ʻia i ka mea ana, ana ma hope o ka thermoelectric emfs, hiki ke ʻike i ka mahana o ke ana ʻana.Thermocouple ana wela a hiki i ke anu wela (ana ana wela no ka wela wela, ma ka hope o ke kepau i pili i ke ana kaapuni i kapaia anu junction) mahana ua malama mau, ka nui o ka thermoelectric hiki a me ke ana wela ma kekahi like like ka pilina.Ke ana ana, hoololi ka wela wela wela (ka puni), e hoopilikia loa i ka pololei o ke ana.E hana i ka uku hopena ma muli o ka hopena o ka hoʻololi ʻana o ka wela wela i kapa ʻia ʻo ka thermocouple cold junction compensation he mea maʻamau.Hoʻopili ʻia i ka mea ana me ke alakaʻi uku uku kūikawā.
Thermocouple cold junction compensation method:
Mai ka millivolt i ka mahana: e ana i ka wela wela wela a me ka hoʻololi ʻana no nā helu millivolt e pili ana, nā waiwai millivolt me ka thermocouple, ka hoʻololi ʻana o ka mahana;
Mai ka wela a hiki i ka millivolt: e ana i ka mahana maoli a me ka wela wela wela a me ka hoʻololi ʻana no nā helu millivolt, i kēlā me kēia, ma hope o ka unuhi ʻana i nā helu millivolt, wela wikiwiki.
Ka manawa hoʻouna: Dec-04-2020