Kho qhov Emissivity ntawm Infrared Thermometers
Cov hluav taws xob infrared yog ubiquitous thiab tsis-kawg, thiab ntau dua qhov kub ntawm qhov sib txawv ntawm cov khoom, qhov pom tseeb dua qhov tshwm sim ntawm hluav taws xob yuav. Lub tshuab nqus tsev tuaj yeem xa cov infrared radiant zog tawm los ntawm lub hnub mus rau lub ntiaj teb los ntawm 93 lab mais ntawm qhov chaw thiab lub sijhawm, qhov twg nws nqus los ntawm peb thiab ua rau peb sov. Thaum peb sawv ntawm lub freezer khoom noj hauv lub khw, cov hluav taws xob hluav taws xob infrared uas peb lub cev tau nqus los ntawm cov khoom noj khov, ua rau peb txias heev. Hauv ob qho piv txwv, cov nyhuv hluav taws xob yog qhov pom tseeb heev, peb tuaj yeem hnov qhov kev hloov pauv thiab xav tias nws muaj nyob.
Thaum peb yuav tsum ntsuas qhov cuam tshuam ntawm cov hluav taws xob infrared, peb yuav tsum ntsuas qhov kub ntawm cov hluav taws xob infrared, thiab lub ntsuas kub infrared yog siv rau lub sijhawm no. Cov khoom sib txawv muaj cov yam ntxwv sib txawv infrared tawg. Ua ntej siv lub ntsuas kub infrared los nyeem qhov ntsuas kub, peb yuav tsum xub nkag siab lub hauv paus ntsiab lus ntawm kev ntsuas hluav taws xob infrared thiab cov yam ntxwv ntawm hluav taws xob infrared ntawm cov khoom tshwj xeeb yuav tsum tau kuaj.
Infrared Radiation=Absorption plus Reflection plus Transmittance
Tsis muaj teeb meem dab tsi ntawm cov hluav taws xob infrared tawm, nws yuav nqus tau, yog li nqus tus nqi=emissivity. Dab tsi lub ntsuas kub infrared nyeem yog lub zog hluav taws xob infrared tawm los ntawm qhov chaw ntawm cov khoom. Lub ntsuas hluav taws xob infrared tsis tuaj yeem nyeem cov hluav taws xob hluav taws xob infrared poob hauv huab cua. Yog li ntawd, hauv kev ntsuas qhov tseeb, peb tuaj yeem tsis quav ntsej qhov kev xa tawm, yog li peb tuaj yeem tau txais cov qauv ntsuas hluav taws xob yooj yim infrared:
Infrared radiance=emissivity - reflectivity
Lub reflectivity yog inversely proportional rau lub emissivity, lub zog ntawm cov khoom muaj peev xwm los cuam tshuam infrared tawg, lub weaker nws tus kheej infrared radiation muaj peev xwm. Feem ntau txoj kev pom kev tuaj yeem siv los txiav txim siab txog qhov cuam tshuam ntawm qhov khoom. Cov tooj liab tshiab muaj qhov cuam tshuam ntau dua thiab qis dua emissivity ({{0}}}07-0.2), thiab oxidized tooj liab muaj qhov cuam tshuam qis dua thiab ntau dua emissivity (0. 6-0.7). ), qhov kev xav ntawm tooj liab blackened los ntawm hnyav oxidation yog qis dua, thiab emissivity yog sib npaug siab dua (0.88). Feem ntau ntawm cov xim pleev xim rau qhov chaw muaj emissivity siab heev (0.9-0.95) thiab tsis tshua muaj kev cuam tshuam.
Rau feem ntau cov ntsuas kub infrared, txhua yam uas yuav tsum tau teeb tsa yog qhov ntsuas emissivity ntawm cov khoom ntsuas, uas feem ntau yog preset rau 0.95, uas yog txaus rau ntsuas cov khoom siv organic lossis pleev xim rau saum npoo.
Los ntawm kev kho cov emissivity ntawm tus pas ntsuas kub, qhov teeb meem ntawm tsis txaus infrared hluav taws xob hluav taws xob nyob rau saum npoo ntawm qee cov ntaub ntawv, tshwj xeeb tshaj yog cov ntaub ntawv hlau, tuaj yeem them rov qab. Kev cuam tshuam ntawm kev cuam tshuam ntawm qhov ntsuas tsuas yog yuav tsum tau txiav txim siab thaum muaj qhov chaw ntawm qhov kub-kub infrared hluav taws xob ze ze ntawm qhov ntsuas ntawm qhov khoom ntsuas thiab cuam tshuam nws.
