Eddy Current Measuring Principple of Txheej Thickness Gauges
High zaus AC teeb liab tsim cov electromagnetic teb nyob rau hauv qhov kev sojntsuam kauj, thiab thaum lub sojntsuam mus txog rau tus neeg xyuas pib, eddy tam sim no yog tsim nyob rau hauv nws. Qhov ze ntawm qhov kev sojntsuam yog mus rau qhov conductive substrate, qhov ntau dua qhov eddy tam sim no thiab siab dua qhov kev cuam tshuam impedance. Qhov kev tawm tswv yim no qhia txog qhov kev ncua deb ntawm qhov kev sojntsuam thiab cov khoom siv hluav taws xob, uas yog, qhov tuab ntawm cov tsis yog -cov txheej txheem conductive ntawm cov khoom siv hluav taws xob. Vim lawv lub peev xwm tshwj xeeb los ntsuas qhov tuab ntawm cov txheej txheej ntawm cov hlau tsis yog ferromagnetic substrates, cov hom kev sojntsuam no feem ntau hu ua non-magnetic probes. Qhov tsis yog-magnetic sojntsuam siv siab- cov ntaub ntawv zaus raws li cov tub ntxhais coil, xws li platinum npib tsib xee alloy lossis lwm yam khoom tshiab. Piv nrog rau lub hauv paus ntsiab lus ntawm magnetic induction, qhov sib txawv tseem ceeb yog qhov ntsuas lub taub hau sib txawv, qhov zaus ntawm lub teeb liab sib txawv, thiab qhov loj thiab qhov sib txawv ntawm cov teeb liab sib txawv. Zoo li cov hlau nplaum induction thickness gauge, eddy tam sim no thickness gauge kuj ua tiav ib theem siab ntawm kev daws teeb meem ntawm 0.1um, tso cai yuam kev ntawm 1%, thiab ntau yam ntawm 10mm.
Lub thickness gauge raws li lub hauv paus ntsiab lus ntawm eddy tam sim no yuav ntsuas tsis yog -coatings coatings ntawm tag nrho cov conductive cov ntaub ntawv, xws li nto ntawm lub dav hlau, tsheb, khoom siv hauv tsev, aluminium alloy qhov rooj thiab qhov rais, thiab lwm yam khoom txhuas, nrog rau cov xim, yas coatings, thiab anodized films. Cov khoom siv txheej txheej muaj qee yam conductivity, uas tuaj yeem ntsuas los ntawm kev ntsuas, tab sis nws yuav tsum tau hais tias qhov sib piv ntawm cov conductivity ntawm ob yog tsawg kawg yog 3-5 npaug sib txawv (xws li chrome plating ntawm tooj liab). Txawm hais tias steel substrate kuj yog cov khoom siv hluav taws xob, nws tseem tsim nyog siv cov qauv sib nqus rau kev ntsuas hauv hom haujlwm no.
