Amamitha okugeleza kagesi(ama-EMF) asetshenziswa kabanzi ezinqubweni zezimboni ngenxa yokunemba kwawo okuphezulu kanye nokuthembeka ekulinganiseniizinga lokugelezauketshezi oluqhubayo. Lawa mamitha asebenza ngokusekelwe kuMthetho kaFaraday wokungeniswa kwe-Electromagnetic, isimiso esiyisisekelo ku-electromagnetism. Lesi sihloko sinikeza incazelo eningiliziwe yokuthi amamitha okugeleza kwe-electromagnetic asebenza kanjani, kusukela kumbono oyisisekelo kuya ezingxenyeni ezisebenzayo kanye nokusetshenziswa.
1. Isisekelo Sethiyori: Umthetho KaFaraday Wokungeniswa Kwe-Electromagnetic
UMthetho kaFaraday uthi lapho umqhubi ehamba ensimini yamagnetic, amandla e-electromotive (EMF) adonswa kuyo yonke i-conductor. Esimweni semitha yokugeleza kagesi, uketshezi oluqhubayo olugeleza ngemitha lusebenza “njengomqhubi,” kuyilapho insimu yamagnetic yangaphakathi yemitha isebenza njengensimu yamagnetic yangaphandle. I-EMF ebangelwayo ilingana ngqo nejubane loketshezi, amandla ensimu yamagnetic, kanye nebanga eliphakathi kwama-electrode alinganisa i-EMF.
Ngokwezibalo, uMthetho kaFaraday ungachazwa kanje:
E=k×B×v×D
kuphi:
- I-E yi-electromotive force ebangelwa yi-electromotive (i-voltage)
- u-k uyinto engaguquki
- I-B iyi-magnetic field enamandla
- i-v yijubane elimaphakathi loketshezi
- U-D ububanzi bepayipi lokulinganisa (elimelela ubude bomqhubi ensimini yamagnetic)
Njengoba amandla ensimu yamagnetic (B) kanye nobubanzi beshubhu (D) kugxilile kumitha yokugeleza ethile, i-voltage ebangelwayo (E) iba isilinganiso esiqondile sejubane loketshezi (V). Ngokuhlanganisa ijubane ngokuhamba kwesikhathi, izinga lokugeleza (ivolumu ngesikhathi seyunithi) lingabalwa.
2. Izingxenye Ezibonakalayo Zemitha Yokugeleza Kagesi
Amakhoyili Kamagnetic noma Ukuhlanganiswa Kwamagnet
Iimitha yokugelezaiqukethe isethi yamakhoyili kazibuthe noma i-common magnet assembly ekhiqiza insimu kazibuthe efanayo eqondile kuya ekuqondeni kokugeleza koketshezi. Insimu kazibuthe ingaba yi-DC (direct - current) noma i-AC (alternating - current), kanti amasimu e-AC avame kakhulu ngenxa yekhono lawo lokunciphisa ukuhlukaniswa kwe-electrode kanye nokuphazamiseka komsindo. Lapho kusetshenziswa insimu kazibuthe ye-AC, i-EMF ebangelwa uketshezi nayo iyahlukahlukana nge-sinusoidal, okwenza kube lula ukucubungula isignali.
Ipayipi Lokulinganisa
Ipayipi lokulinganisa yingxenye lapho uketshezi lugeleza khonaukugelezas. Ngokuvamile yenziwe ngezinto ezingezona ezikagesi nezingezona ezihambisa umoya (njengensimbi engagqwali efakwe i-PTFE, irabha, noma i-ceramic) ukuvimbela ukuphazamiseka kwensimu kagesi nokuqinisekisa ukulinganiswa okunembile. Ubuso bangaphakathi bepayipi bubushelelezi ukunciphisa ukungqubuzana nokulahlekelwa yingcindezi, okuvumela uketshezi ukuthi lugeleze ngokukhululeka.
Ama-electrode
Ama-electrode amabili abekwe maqondana odongeni lwepayipi lokulinganisa, aqonde ngqo kokubili ohlangothini lokugeleza koketshezi kanye nensimu yamagnetic. Lawa ma-electrode axhumana ngqo noketshezi futhi asetshenziselwa ukuthola i-EMF ebangelwayo. Ama-electrode ngokuvamile enziwe ngezinto ezingamelani nokugqwala (isb., i-Hastelloy, i-platinum - i-iridium alloy) ukuze amelane nokuchayeka koketshezi oluhlukahlukene, ikakhulukazi lezo ezinezakhiwo ezivuthayo noma ezigqwalisayo.
Isiguquli Sesignali
I-EMF ebangelwa yi-electrode iyisignali kagesi ebuthakathaka kakhulu, ngokuvamile ebangeni le-microvolt. Isiguquli sesignali, esaziwa nangokuthi i-transmitter, siyakhulisa, sihlunge, futhi sisicubungule lesi signali ukuze sisiguqule sibe umphumela osebenzisekayo. Singashintsha isignali sibe amafomethi okukhipha ajwayelekile ezimbonini afana nama-loop wamanje angu-4 - 20 mA, amasignali edijithali (isb., i-HART, i-Modbus), noma sixhumane ngaphandle kwentambo nezinhlelo zokulawula, okuvumela ukuqapha kwesikhathi sangempela nokulawula izinga lokugeleza.
3. Inqubo Yokusebenza Yesinyathelo Ngesinyathelo
- Ukukhiqizwa Kwensimu Kamagnetic: Amakhoyili kazibuthe noma i-magnet assembly idala insimu kazibuthe ezinzile kuyo yonke ipayipi yokulinganisa. Le nsimu iqonde ngqo lapho ukugeleza koketshezi kuhamba khona, okuqinisekisa ukuthi uketshezi oluhamba ngepayipi lunqamula imigqa yamandla kazibuthe.
- Ukungeniswa kwe-EMF: Njengoba uketshezi oluqhubayo lugeleza ngepayipi lokulinganisa, lusebenza njengomqhubi ohambayo ensimini yamagnetic. Ngokusho koMthetho kaFaraday, amandla e-electromotive (EMF) abangelwa kulo lonke uketshezi. Ubukhulu balo EMF buhambisana nejubane loketshezi, amandla ensimu yamagnetic, kanye nobubanzi bepayipi lokulinganisa.
- Ukutholwa Kwesignali: Ama-electrode amabili abekwe odongeni lwethubhu athola i-EMF ebangelwayo. Njengoba ama-electrode ethintana noketshezi, abamba umehluko wamandla kagesi okhiqizwa uketshezi oluhambayo ensimini yamagnetic.
- Ukucutshungulwa Kwesignali: Isignali ye-EMF ebuthakathaka etholwe ama-electrode ithunyelwa ku-converter yesignali. Lapha, isignali ikhuliswa ukuze ikhulise amandla ayo, ihlungwe ukuze kususwe umsindo nokuphazamiseka, futhi iguqulwe ibe yisignali yokuphuma ejwayelekile (isb., 4 - 20 mA, idatha yedijithali).
- Ukubalwa Kwezinga Lokugeleza: Isignali ecutshunguliwe isetshenziswa ukubala izinga lokugeleza koketshezi. Isiguquli sesignali sisebenzisa ama-algorithms ezibalo asekelwe kuma-constant aziwayo emitha yokugeleza (amandla ensimu yamagnetic, ububanzi beshubhu) ukuguqula i-EMF elinganisiwe ibe yinani lezinga lokugeleza, elingaboniswa endaweni kumitha noma lidluliselwe ohlelweni lokuqapha olukude.
4. Izinto Ezibalulekile Ezicatshangelwayo Nemingcele
Isidingo Sokuqhuba Uketshezi
Amamitha okugeleza kagesiingalinganisa kuphela ukugeleza koketshezi oluqhubayo. Umthamo omncane wokudlulisa odingekayo uyahlukahluka kuye ngomkhiqizi kodwa ngokuvamile usukela ku-5 kuya ku-50 μS/cm (i-micro - Siemens per centimeter). Uketshezi olunomthamo ophansi kakhulu, njengamanzi ahlanziwe kakhulu noma ama-hydrocarbon, alufaneleki ukulinganiswa ngama-EMF ajwayelekile. Kodwa-ke, amamodeli akhethekile aklanyelwe uketshezi oluqhubayo oluphansi angandisa ububanzi bokulinganisa.
Ukuphazamiseka Kwensimu Yama-Magnetic
Amasimu kazibuthe angaphandle angaphazamisa ukusebenza kwamamitha okugeleza kagesi. Ukuze kuncishiswe lokhu, kubalulekile ukuvikela nokubeka phansi imitha ngendlela efanele. Ngaphezu kwalokho, indawo yokufaka kufanele ikhethwe ngokucophelela ukuze kugwenywe ukusondelana nemishini kagesi emikhulu noma eminye imithombo yamasimu kazibuthe.
Ukufakwa Nokulinganiswa
Ukufakwa okufanele kubalulekile ukuze kulinganiswe kahle.imitha yokugelezakufanele ifakwe engxenyeni eqondile yepayipi enobude obanele bepayipi eliqondile elingaphezulu nangaphansi komfula (ngokuvamile ubukhulu bepayipi obuphindwe ka-5 - 10 obungaphezulu komfula kanye nobubanzi obuphindwe ka-3 - 5 obuphansi komfula) ukuqinisekisa iphrofayili yokugeleza ezinzile nefanayo. Ukulinganiswa okuvamile, kungaba ngokuqinisekiswa kwendawo noma ukuqhathanisa nezindinganiso zokugeleza ezaziwayo, kuyadingeka futhi ukuze kugcinwe ukunemba kokulinganisa ngokuhamba kwesikhathi.
Ekuphetheni, amamitha okugeleza kagesi asebenzisa uMthetho kaFaraday wokungeniswa kwe-Electromagnetic ukuze anikeze okunembile nokuthembekile.izilinganiso zokugelezangoketshezi oluqhubayo. Ukuqonda isimiso sabo sokusebenza kubalulekile ekukhetheni, ekufakeni, nasekusebenzeni okufanele ezinhlotsheni ezahlukene zezimboni, kusukela ekuhlanzweni kwamanzi nasekucutshungulweni kwamakhemikhali kuya ekukhiqizweni kokudla neziphuzo.
Isikhathi sokuthunyelwe: Juni-24-2025