Hauv cov ntsuas kub infrared, lub luag haujlwm ntawm lub cev dub yog dab tsi?
(1) Ib yam khoom uas nqus cov hluav taws xob sab nraud ntawm txhua lub wavelength yam tsis muaj kev xav hauv ib qho xwm txheej.
(2) Cov khoom nrog qhov nqus nqus ntawm 1.
(3) Ib yam khoom uas nqus tau tag nrho cov teeb meem hluav taws xob ntawm txhua lub wavelength ntawm qhov kub thiab txias. Txhua yam khoom muaj peev xwm ua kom tsis tu ncua radiate, nqus, thiab emit electromagnetic tsis. Cov hluav taws xob hluav taws xob hluav taws xob sib txawv sib txawv hauv txhua pawg, uas yog, lawv muaj qee qhov kev faib tawm spectral. Qhov kev faib tawm spectral no muaj feem xyuam rau cov yam ntxwv ntawm cov khoom nws tus kheej thiab nws qhov kub thiab txias, yog li nws hu ua thermal tawg. Txhawm rau kawm cov cai ntawm thermal tawg uas tsis nyob ntawm qhov tshwj xeeb lub cev ntawm cov teeb meem, physicists tau txhais cov khoom zoo tagnrho-lub cev dub-raws li cov khoom siv rau kev tshawb fawb thermal radiation. Lub cev hu ua dub txhais tau hais tias txhua qhov xwm txheej electromagnetic tsis tau nqus, tsis muaj kev cuam tshuam lossis kev sib kis (ntawm chav kawm, lub cev dub tseem tawm sab nraud).
Kirchhoff txoj cai hluav taws xob (Kirchhoff), qhov piv ntawm lub zog hluav taws xob los ntawm ib qho khoom hauv thermal equilibrium rau nws tus nqi nqus tsis muaj dab tsi cuam tshuam nrog lub cev ntawm cov khoom nws tus kheej, tab sis tsuas yog cuam tshuam nrog wavelength thiab kub. Raws li Kirchhoff txoj cai hluav taws xob, ntawm qhov kub thiab txias, lub cev dub yuav tsum yog cov khoom muaj peev xwm hluav taws xob loj tshaj plaws, thiab tuaj yeem hu ua lub tshuab hluav taws xob zoo meej. Lub electromagnetic nthwv dej radiated los ntawm cov khoom sib txawv hauv infrared thermal imaging yeej tsis cuam tshuam. Lub cev dub no tsuas yog siv cov khoom siv xwb, sib npaug rau xoom taw tes. Tab sis lub cev dub zoo li no tsis muaj nyob hauv lub ntiaj teb tiag tiag, yog li siv dab tsi los piav txog qhov txawv no? Rau txhua lub wavelength, emissivity yog txhais nyob rau hauv ib tug me me wavelength lub sij hawm ntawm lub wavelength. Lub zog hluav taws xob ntawm cov khoom tiag yog tib yam li ntawm lub cev dub ntawm tib qhov kub. ratio ntawm radiated zog. Pom tseeb tias qhov emissivity yog tus lej zoo ntawm 0 thiab 1. Feem ntau, qhov emissivity nyob ntawm cov khoom siv, ib puag ncig thiab kev soj ntsuam. Yog hais tias lub emissivity yog ywj siab ntawm wavelength, cov khoom yuav hu ua lub cev grey, txwv tsis pub nws yog hu ua ib tug xaiv radiator.
Infrared thermal imaging koob yees duab yuav raug cuam tshuam los ntawm lwm yam tseem ceeb thaum siv mus sij hawm ntev, ua rau yuam kev, yog li lawv yuav tsum tau calibrated nrog lub cev dub.
