Eddy chizvarwa chazvino mune simbi conductor

A.1 General

Eddy zvazvino zviridzwa zvinoshanda pamusimboti wekuti yakakwira frequency electromagnetic munda inogadzirwa neprobe system yechiridzwa inoburitsa eddy currents mune yemagetsi conductor panoiswa probe. Aya mafungu anokonzeresa shanduko yeamplitude uye/kana chikamu cheprobe coil impedance, iyo inogona kushandiswa seyero yehukobvu hwejasi pane kondakita (ona Muenzaniso 1) kana we conductor pachayo (ona Muenzaniso 2 )

Mufananidzo A.1 unomiririra chizvarwa chazvino cheeddy mune simbi conductor uye Mufananidzo A.2 inomiririra vector.
yeeddy current generation.

Iyo amplitude-sensitive eddy yazvino nzira inonyatsokodzera kuyerwa kweasina-conductive coating pane asiri magineti masimbi (ona Muenzaniso 1) asiwo kushama asiri magineti. metallic machira pane nonconductive hwaro zvinhu (ona Muenzaniso 2). Iyo phase-sensitive eddy yazvino nzira (ona ISO 21968) inonyatsokodzera kuyerwa kweasiri-magnetic metallic coatings pane simbi kana isiri-metallic base zvinhu (ona Muenzaniso 2) kunyanya kana iyo simbi yekupfeka ichifanira kuyerwa nependi kana chiyero chisina kuonana chinodiwa, kureva kuti "Lift-off" muripo unodiwa.

A.2 Muenzaniso 1 - Non-conductive coating pane conductive base material

Muchiitiko ichi eddy current density inongotarirwa nenhambwe iri pakati peprobe uye hwaro hwesimbi, kureva ukobvu hwekuputira. Kuti ukwanise kuita izvi hwaro hwezvinhu hwakakora kupfuura hushoma hwaro hwezvinhu ukobvu. Ukobvu hudiki uhu, dmin, mumm, hunogona kufungidzirwa se(ona 5.3.): dmin = 2,5 δ0 (A.2)
Kana iyo hwaro hwezvinhu ukobvu hwakaderera pane uhwu hudiki ukobvu, dmin, iyo yakayerwa kukosha kweiyo ukobvu hwekuputira ichakanganiswa.

A.3 Muenzaniso 2 - Conductive coating pane isiri-conductive basis material

Mune ino kesi iyo eddy ikozvino density inotarirwa chete nehupamhi hweiyo conductive coating. Ukobvu hunoyemurika hwepamusoro, dmax, mumm, hunogona kuverengerwa kubva kuequation:
dmax = 0,8 δ0 (A.3) kureva kuwanda kwehukobvu kunoganhurwa nekudzika kwekupinda δ0 uye kana conductive coating ukobvu ukawedzera, haizove neimwe kufurira pane inogadzirwa eddy currents.
ONA dmax dzimwe nguva inonzi "saturation ukobvu".