Txhawm rau kho qhov emissivity ntawm tus pas ntsuas kub infrared, ua raws li cov kauj ruam no
Infrared (IR) hluav taws xob
Cov hluav taws xob infrared nyob txhua qhov chaw thiab tsis muaj qhov kawg. Qhov sib txawv ntawm qhov kub ntau dua ntawm cov khoom, qhov pom tseeb dua qhov tshwm sim ntawm hluav taws xob. Lub tshuab nqus tsev tuaj yeem xa cov hluav taws xob hluav taws xob hluav taws xob tawm los ntawm lub hnub mus rau lub ntiaj teb los ntawm 93 lab mais ntawm qhov chaw thiab lub sijhawm, qhov twg nws tuaj yeem nqus tau los ntawm peb thiab ua rau peb sov. Thaum peb sawv ntawm pem hauv ntej ntawm lub tub yees khoom noj khoom haus hauv lub khw muag khoom, cov hluav taws xob hluav taws xob hluav taws xob uas tawm los ntawm peb lub cev yog nqus los ntawm cov khoom noj tub yees, ua rau peb txias heev. Hauv ob qho piv txwv, cov nyhuv hluav taws xob yog qhov pom tseeb heev, thiab peb tuaj yeem hnov qhov kev hloov pauv thiab hnov nws lub xub ntiag.
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 qhov no siv lub ntsuas kub infrared. 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 txog cov ntsiab lus tseem ceeb ntawm kev ntsuas hluav taws xob hluav taws xob hluav taws xob thiab cov yam ntxwv ntawm hluav taws xob infrared ntawm cov khoom tshwj xeeb raug ntsuas.
Tus nqi hluav taws xob infrared=absorptivity + reflectivity + 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 tshuab 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, kom peb tau txais cov qauv ntsuas hluav taws xob yooj yim infrared:
Infrared radiance=emissivity - reflectivity
Reflectivity yog inversely proportional rau emissivity. Qhov muaj zog ntawm cov khoom muaj peev xwm los cuam tshuam cov hluav taws xob infrared, qhov tsis muaj zog ntawm nws tus kheej muaj peev xwm rau hluav taws xob infrared. Qhov kev xav ntawm ib yam khoom feem ntau tuaj yeem txiav txim los ntawm kev tshuaj xyuas qhov muag. Cov tooj liab tshiab muaj qhov cuam tshuam ntau dua tab sis qis dua emissivity ({{0}}}07-0.2), thiab oxidized tooj liab muaj qhov cuam tshuam qis dua thiab ntau dua emissivity (0.{{ 4}}.7 ), tooj liab blackened los ntawm hnyav oxidation muaj ib tug txawm tsawg reflectivity thiab ib tug correspondingly siab emissivity (0.88). Cov xim pleev xim feem ntau muaj qhov 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. Tus nqi no feem ntau yog preset rau 0.95, uas yog txaus rau ntsuas cov ntaub ntawv organic lossis pleev xim rau.
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 tuaj yeem raug them, tshwj xeeb tshaj yog rau cov khoom siv hlau. Qhov cuam tshuam ntawm kev cuam tshuam ntawm kev ntsuas yuav tsum tau txiav txim siab tsuas yog thaum muaj qhov kub-kub infrared hluav taws xob nyob ze ntawm qhov chaw ntawm qhov khoom yuav ntsuas thiab cuam tshuam nws.
