Hauv Infrared Thermometers, dab tsi yog lub luag haujlwm ntawm tus neeg ntiaj teb?
(1) Ib qho khoom uas tau nqus ib qho nthwv dej ntawm hluav taws xob sab nraud yam tsis muaj kev cuam tshuam nyob rau txhua qhov xwm txheej.
(2) ib qho khoom nrog kev nqus cov piv txwv ntawm 1
(3) Ib qho khoom uas nqus txhua qhov hluav taws xob hluav taws xob ntawm ib lub nthwv dej ntawm ib qho kub. Txhua yam khoom muaj peev xwm ua kom tsis tu ncua radiate, nqus, thiab emit electromagnetic vuag. Lub tshuab hluav taws xob hluav taws xob hluav taws xob hluav taws xob tawm muaj cov kev faib tawm sib txawv hauv cov sib txawv. Qhov kev faib tawm spectral spection no yog cuam tshuam nrog cov yam ntxwv ntawm cov khoom nws tus kheej thiab nws qhov kub thiab yog li no thermal hluav taws xob. Txhawm rau kawm cov cai ntawm hluav taws xob uas tsis yog nyob ntawm cov khoom tshwj xeeb ntawm cov teeb meem ntawm cov teeb meem - lub cev dub - raws li tus qauv khoom siv rau thermal radiation kev tshawb fawb. Qhov thiaj li hu ua dub leej twg hais txog qhov nqus ntawm txhua qhov xwm txheej hluav taws xob, tsis muaj kev cuam tshuam lossis kis tau (ntawm chav kawm (ntawm kev sib kis hluav taws xob tseem radiates sab nraud).
Kirchhoff's radiation law states that the ratio of energy radiated by an object in thermal equilibrium to its absorption rate is independent of the physical properties of the object itself, and only depends on wavelength and temperature. Raws li Kirchhoff lub teeb meem hluav taws xob, ntawm ib qho kub thiab txias, ib lub ntsej muag zoo nkauj uas muaj peev xwm ua kom muaj hluav taws xob ntau tshaj plaws, uas tuaj yeem hu ua lub teb chaws tiav. Lub hom hluav taws xob tsis sib xws los ntawm cov tshuaj sib txawv nyob rau hauv infrared thermography tsis sib tshuam, thiab cov neeg no yog ib qho kev siv, sib npaug rau cov xoom. Tab sis nyob rau hauv lub ntiaj teb tiag, tsis muaj qhov zoo tshaj plaws dubbody, yog li dab tsi tuaj yeem siv los piav txog qhov sib txawv no? Rau tej nthwv dej, lub emissivity yog txhais tias qhov sib piv ntawm lub zog hluav taws xob ntawm lub zog hluav taws xob ntawm lub zog hluav taws xob ntawm cov neeg dub tib yam. Pom tseeb, emissivity yog tus naj npawb zoo ntawm 0}} thiab feem ntau nyob ntawm cov khoom siv, ib puag ncig cov khoom, thiab kev saib xyuas. Yog tias Emissivity yog ywj siab ntawm nthwv dej, tom qab ntawd ib qho khoom tuaj yeem hu ua lub cev grey, tsis li ntawd, nws hu ua ib tug xaiv radiator.
