Ukutholwa kwamaphutha amanje ka-Eddy kuyindlela yokuthola amaphutha esebenzisa umgomo wokungeniswa kwe-electromagnetic ukuthola ukonakala okungaphezulu kwezingxenye nezinto zensimbi. Indlela yokubona yikhoyili yokubona kanye lokuhlukaniswa kwayo kanye lesakhiwo sekhoyili yokubona.

Izinzuzo zokutholwa kwephutha lamanje le-eddy lamashubhu angenamthungo yilezi: imiphumela yokuthola amaphutha ingaphuma ngokuqondile ngamasignali kagesi, okulungele ukutholwa okuzenzakalelayo; ngenxa yendlela yokungathinteki, isivinini sokuthola amaphutha siyashesha kakhulu; ifanele ukuhlonza amaphutha angaphezulu. Ukungalungi yilezi: amaphutha ezingxenyeni ezijulile ngaphansi kobuso be-tube yensimbi engenamthungo azikwazi ukubonwa; kulula ukukhiqiza izimpawu ezingcolile; kunzima ukuhlukanisa ngokuqondile uhlobo lweziphambeko kumasiginali abonisiwe atholwe ngokutholwa.
Umsebenzi wokuthola amaphutha eshubhu lensimbi engenamthungo uhlanganisa izinyathelo ezimbalwa ezifana nokuhlanzwa kwendawo yocezu lokuhlola, ukuzinza komtshina wamaphutha, ukukhethwa kokucaciswa kokutholwa kwephutha, nokuhlolwa kokutholwa kwamaphutha.

Isiqondiso se-eddy current kusampula yeshubhu elingenamthungo iphambene nendlela yamanje yekhoyili eyinhloko (noma ikhoyili evusa amadlingozi). Inkambu kazibuthe eshintshanayo ekhiqizwa i-eddy yamanje ishintsha ngokuhamba kwesikhathi, futhi lapho idlula kukhoyili eyinhloko, idala ukushintshashintsha kwamandla kukhoyili. Ngenxa yokuthi isiqondiso salo msinga siphambene naso sisuka ku-eddy current, umphumela ubheke ngakulowo wamanje othokozisayo kukhoyili yokuqala. Lokhu kusho ukuthi i-current in the primary coil iyanda ngenxa yokusabela kwe-eddy currents. Uma ushintsho lwamanje lwe-eddy, le ngxenye eyengeziwe nayo iyashintsha. Ngokuphambene nalokho, ngokulinganisa ushintsho lwamanje, ukuguqulwa kwe-eddy yamanje kungalinganiswa, ukuze uthole ulwazi mayelana nokukhubazeka kwe-tube yensimbi engenamthungo.

Ngaphezu kwalokho, ukushintshashintsha kwamanje kushintsha isiqondiso samanje ngefrikhwensi ethile ngokuhamba kwesikhathi. Kunomehluko othize esigabeni se-excitation current kanye ne-reaction current, futhi lo mehluko wesigaba ushintsha ngokuma kwesiqephu sokuhlola, ngakho-ke lolu shintsho lwesigaba lungasetshenziswa futhi njengocezu lolwazi ukuze kutholwe isimo se-seamless. insimbi tube test piece. Ngakho-ke, lapho ucezu lokuhlola noma ikhoyili ihanjiswa ngesivinini esithile, uhlobo, ukuma kanye nobukhulu bokukhubazeka kwepayipi lensimbi kungaziwa ngokusho kwe-waveform yoshintsho lwamanje lwe-eddy. I-alternating current eyenziwa yi-oscillator idluliselwa kukhoyili, futhi insimu yamagnetic eshintshanayo isetshenziswa esiqeshini sokuhlola. I-eddy current yocezu lokuhlola itholwa ikhoyili bese ithunyelwa kumjikelezo webhuloho njengokuphuma kwe-AC.