Dab tsi yog lub luag haujlwm ntawm tus blackbody hauv lub ntsuas kub infrared?
(1) Ib yam khoom uas, nyob rau hauv tej yam kev mob, kiag li absorbs sab nraud hluav taws xob ntawm tej wavelength yam tsis muaj kev xav.
(2) Ib yam 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 mus tas li radiate, nqus, thiab emit electromagnetic tsis. Radiation tawm ntawm electromagnetic nthwv dej nyob rau hauv ntau yam bands txawv, uas yog, nrog ib tug tej yam spectral tis. Qhov kev faib spectral no muaj feem xyuam rau cov khoom ntawm cov khoom nws tus kheej thiab nws qhov kub thiab txias, thiab yog li hu ua thermal tawg. Txhawm rau kawm cov kev cai ntawm cov hluav taws xob hluav taws xob uas tsis nyob ntawm qhov tshwj xeeb ntawm lub cev ntawm cov khoom, cov kws kho mob tau txhais cov khoom zoo tshaj plaws - lub cev dub (lub cev dub), ua cov khoom siv rau kev kawm ntawm thermal tawg. Lub cev hu ua dub yog hais txog qhov xwm txheej electromagnetic nthwv dej yog tag nrho absorbed, tsis muaj kev xav lossis kev sib kis (qhov tseeb, lub cev dub tseem dub lub cev hluav taws xob tseem yuav tawm sab nraud).
Kirchhoff txoj cai ntawm hluav taws xob (Kirchhoff), nyob rau hauv lub thermal equilibrium lub xeev ntawm cov khoom ntawm lub zog hluav taws xob thiab qhov piv ntawm qhov nqus tus nqi thiab cov khoom nws tus kheej tsis muaj dab tsi ua rau lub cev muaj zog, tsuas yog nrog lub wavelength thiab kub. Raws li Kirchhoff txoj cai ntawm hluav taws xob, ntawm qhov kub thiab txias, lub cev dub yuav tsum yog lub peev xwm hluav taws xob * cov khoom loj, tuaj yeem hu ua lub tshuab hluav taws xob ua tiav. Infrared thermal imaging ntawm electromagnetic nthwv dej radiated los ntawm cov khoom sib txawv yeej tsis intersected, no blackbody tsuas yog siv, sib npaug rau xoom point. Tab sis lub ntiaj teb tiag tiag tsis muaj xws li ib tug zoo tagnrho blackbody, yog li dab tsi yog siv los piav txog qhov txawv no? Rau txhua lub wavelength, lub ntsiab lus ntawm emissivity rau lub wavelength ntawm ib tug me me wavelength lub sij hawm, cov khoom tiag tiag ntawm lub zog radiant thiab tib qhov kub thiab txias ntawm lub cev dub ntawm qhov piv ntawm lub zog radiant. Kom meej meej qhov emissivity yog tus lej zoo ntawm 0 thiab 1. Feem ntau, qhov emissivity nyob ntawm cov khoom ntawm cov khoom, cov khoom ib puag ncig thiab kev soj ntsuam. Yog hais tias lub emissivity yog ywj siab ntawm lub wavelength, cov khoom yuav hu ua grey lub cev, txwv tsis pub nws yog hu ua ib tug xaiv radiator.
Thermal imaging koob yees duab tuaj yeem cuam tshuam los ntawm lwm yam hauv lub sijhawm siv mus ntev, ua rau muaj kev ua yuam kev, yog li lawv yuav tsum tau calibrated nrog lub cev grey.
