Txoj kev kho qhov Emissivity ntawm Infrared Thermometers
Infrared (IR) hluav taws xob
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. Lub tshuab nqus tsev tuaj yeem xa cov hluav taws xob hluav taws xob hluav taws xob tawm los ntawm lub hnub mus txog 93 lab mais ntawm lub sijhawm mus rau lub ntiaj teb, uas tau nqus los ntawm peb thiab ua rau peb sov siab. Thaum peb sawv ntsug ntawm lub freezer khoom noj hauv lub khw, cov hluav taws xob hluav taws xob infrared uas tawm los ntawm peb lub cev yog nqus los ntawm cov khoom noj hauv tub yees, ua rau peb xav tias 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 ntawm qhov no, peb yuav tsum 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 nkag siab lub hauv paus ntsiab lus ntawm kev ntsuas hluav taws xob infrared thiab cov yam ntxwv tshwj xeeb ntawm hluav taws xob infrared ntawm cov khoom siv kuaj.
Infrared emissivity=absorbance plus reflectance plus transmittance
Tsis muaj teeb meem dab tsi ntawm cov hluav taws xob infrared tawm, nws yuav raug absorbed ib zaug emission, yog li tus nqi nqus sib npaug ntawm emissivity. Tus pas ntsuas kub infrared nyeem cov hluav taws xob hluav taws xob infrared tawm ntawm qhov chaw ntawm cov khoom, thiab lub ntsuas hluav taws xob infrared tsis tuaj yeem nyeem cov hluav taws xob hluav taws xob infrared poob hauv huab cua. Yog li, hauv kev ntsuas kev ua haujlwm, peb tuaj yeem tsis quav ntsej qhov kev xa tawm, thiab yog li tau txais cov qauv ntsuas hluav taws xob hluav taws xob yooj yim:
Infrared emissivity =emissivity reflectance
Lub reflectivity yog inversely proportional rau lub emissivity, thiab lub zog ntawm ib yam khoom lub peev xwm los cuam tshuam infrared tawg, lub weaker nws tus kheej muaj peev xwm los emit infrared tawg. Feem ntau, kev tshuaj xyuas qhov muag yog siv los txiav txim siab qhov cuam tshuam ntawm ib qho khoom. Cov tooj liab tshiab muaj qhov cuam tshuam ntau dua thiab qis dua emissivity ({{0}}}07-0.2), oxidized tooj liab muaj qhov cuam tshuam qis dua thiab ntau dua emissivity (0.6-0 .7), thiab tooj liab uas tau blackened vim hnyav oxidation muaj txawm tsawg reflectivity thiab correspondingly emissivity siab dua (0.88). Feem ntau ntawm qhov chaw coated nrog cov xim muaj emissivity siab heev (0.
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 raug them. Tsuas yog thaum muaj qhov kub-kub infrared hluav taws xob nyob ze ntawm qhov chaw ntsuas qhov ntsuas uas cuam tshuam nws, qhov cuam tshuam ntawm kev cuam tshuam ntawm qhov ntsuas yuav tsum tau xav txog.
