Eddy Thickness Gauge Flow Measurement Principple
Lub high-frequency AC teeb liab generates electromagnetic teb nyob rau hauv lub sojntsuam kauj, thiab thaum lub sojntsuam nyob ze 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 ntau dua qhov cuam tshuam impedance. Qhov kev tawm tswv yim no sawv cev rau qhov kev ncua deb ntawm qhov kev sojntsuam thiab cov khoom siv hluav taws xob, uas yog, lub thickness ntawm cov txheej txheem uas tsis yog-conductive ntawm lub conductive substrate. Txij li hom kev sojntsuam no tshwj xeeb tsim los ntsuas qhov tuab ntawm cov txheej txheem ntawm cov hlau tsis-ferromagnetic substrates, nws feem ntau hu ua kev sojntsuam tsis sib nqus. Cov kev sojntsuam tsis sib nqus siv cov khoom siv ntau zaus raws li cov tub ntxhais coil, xws li platinum-nickel alloy lossis lwm yam ntaub ntawv tshiab. Piv nrog rau lub hauv paus ntsiab lus ntawm kev sib nqus induction, qhov sib txawv tseem ceeb yog qhov kev sojntsuam 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 mus txog ib theem siab ntawm kev daws teeb meem ntawm 0.1um, tso cai yuam kev ntawm 1%, thiab ntsuas ntau yam ntawm 10mm.
Thickness gauges siv lub eddy tam sim no txoj cai yuav, nyob rau hauv lub hauv paus ntsiab lus, ntsuas tsis-conductive coatings rau tag nrho cov conductive lub cev, xws li xim, yas coatings rau saum npoo ntawm aerospace aircraft, tsheb, khoom siv hauv tsev, aluminium alloy qhov rooj thiab qhov rais, thiab lwm yam khoom txhuas. . Anodized zaj duab xis. Cov khoom siv cladding muaj qee yam conductivity, uas tuaj yeem ntsuas los ntawm calibration, tab sis qhov sib piv ntawm cov conductivities ntawm ob yuav tsum muaj tsawg kawg yog 3-5 zaus sib txawv (xws li chromium plating ntawm tooj liab). Txawm hais tias cov hlau matrix kuj yog tus neeg xyuas pib, nws tsim nyog siv lub hauv paus ntsiab lus sib nqus rau hom haujlwm no.
