Taw qhia ntawm Eddy Current Measuring Principple of Coating Thickness Gauge
Lub high-frequency AC teeb liab generates ib tug 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 kev xav impedance. Qhov kev tawm tswv yim no qhia txog qhov loj ntawm qhov kev ncua deb ntawm qhov kev sojntsuam thiab cov khoom siv hluav taws xob, uas yog, lub thickness ntawm cov txheej tsis yog conductive ntawm lub conductive substrate. Vim tias hom txheej txheej thickness gauge sojntsuam no yog tsim los ntsuas lub thickness ntawm cov txheej ntawm cov hlau tsis-ferromagnetic substrates, nws feem ntau hu ua ib qho kev sojntsuam tsis sib nqus. Non-magnetic probes siv cov khoom siv high-frequency ua coil cores. Piv nrog rau lub hauv paus ntsiab lus ntawm kev sib nqus induction, qhov sib txawv tseem ceeb yog qhov kev sojntsuam ntawm cov txheej thickness ntsuas qhov sib txawv, lub teeb liab zaus sib txawv, thiab cov teeb liab loj thiab kev sib raug zoo sib txawv. Cov txheej txheej thickness gauge siv lub hauv paus ntsiab lus ntawm eddy tam sim no yuav ntsuas tsis-conductive coatings ntawm tag nrho cov conductive substrates nyob rau hauv lub hauv paus ntsiab lus, xws li xim thiab yas coatings rau saum npoo ntawm aerospace tsheb, tsheb, khoom siv hauv tsev, aluminium alloy qhov rooj thiab qhov rais, thiab lwm yam txhuas. cov khoom. thiab anodized zaj duab xis. Cov khoom siv txheej txheej muaj qee yam conductivity, uas tuaj yeem ntsuas los ntawm calibration, tab sis qhov piv ntawm ob qhov conductivity yuav tsum muaj tsawg kawg yog 3-5 zaus sib txawv. Txawm hais tias steel substrates kuj yog cov neeg siv hluav taws xob, lub hauv paus ntsiab lus sib nqus ntawm kev ntsuas txheej tuab yog tsim nyog rau hom haujlwm no.
Muaj ntau yam cuam tshuam rau txheej thickness gauge ntsuas. Lub thickness ntsuas los ntawm txoj kev sib nqus yog cuam tshuam los ntawm kev hloov pauv ntawm cov khoom siv hlau ntawm lub hauv paus (hauv kev siv tswv yim, kev hloov pauv ntawm cov khoom sib nqus ntawm cov hlau tsis muaj carbon tsawg tuaj yeem suav tias yog me ntsis). Daim ntawv txheem yog siv los ntsuas qhov ntsuas; cov conductivity ntawm lub hauv paus hlau muaj feem xyuam rau kev ntsuas, thiab cov conductivity ntawm lub hauv paus hlau muaj feem xyuam rau nws cov khoom muaj pes tsawg leeg thiab txoj kev kho cua sov. Calibrate lub ntsuas los ntawm kev siv ib daim ntawv txheem nrog tib yam khoom raws li lub hauv paus hlau ntawm lub xeem daim; txhua qhov ntsuas muaj qhov tseem ceeb tuab, ntau dua li qhov tuab no, qhov ntsuas yuav tsis cuam tshuam los ntawm cov thickness ntawm lub hauv paus hlau; Nws yog rhiab heev rau qhov hloov pauv sai ntawm qhov saum npoo ntawm daim ntawv xeem, Yog li ntawd, nws tsis tuaj yeem ntsuas qhov ze ntawm ntug lossis sab hauv kaum ntawm daim ntawv xeem; qhov curvature ntawm daim ntawv xeem muaj kev cuam tshuam rau kev ntsuas, uas nce ntxiv nrog qhov txo qis ntawm lub vojvoog ntawm curvature, yog li ntawd, kev ntsuas ntawm qhov chaw ntawm qhov nkhaus ntawm qhov ntsuas qhov ntsuas kuj tseem tsis ntseeg, qhov kev sojntsuam yuav deform cov qauv mos txheej, yog li tsis muaj cov ntaub ntawv ntseeg tau tuaj yeem ntsuas ntawm cov qauv no; qhov nto roughness ntawm lub hauv paus hlau thiab txheej muaj feem xyuam rau qhov ntsuas. Raws li qhov roughness nce, qhov cuam tshuam nce, thiab qhov ntxhib saum npoo yuav ua rau kev ua haujlwm tsis zoo thiab kev ua yuam kev. Thaum ntsuas txhua zaus, tus naj npawb ntawm kev ntsuas yuav tsum tau nce ntawm ntau txoj haujlwm txhawm rau kov yeej qhov yuam kev no. Yog hais tias lub hauv paus hlau ntawm lub substrate yog ntxhib, nws tseem yuav tsum tau coj ob peb txoj hauj lwm ntawm lub uncoated puag hlau xeem daim nrog zoo roughness calibrate lub xoom point ntawm lub ntsuas, los yog siv ib tug tov uas tsis corrode lub hauv paus hlau kom yaj. thiab tshem tawm cov txheej, thiab tom qab ntawd calibrate lub ntsuas qhov zero point; lub zog hlau nplaum uas tsim los ntawm ntau yam khoom siv hluav taws xob nyob ib puag ncig yuav cuam tshuam nrog kev sib nqus thickness ntsuas ua haujlwm; cov khoom txuas uas tiv thaiv qhov kev sojntsuam los ntawm kev sib raug zoo nrog cov txheej txheej yuav tsum tau muab pov tseg. Thaum lub sij hawm ntsuas, lub siab yuav tsum nyob twj ywm. Qhov kev ntsuas siab tshaj plaws tuaj yeem ua tiav tsuas yog yog tias qhov chaw ntawm qhov chaw khaws cia ntsug.
