Ntau npaum li cas emissivity ntawm ib yam khoom cuam tshuam rau hluav taws xob ntsuas kub?
Cov khoom tiag tiag uas muaj nyob hauv qhov yuav luag tsis yog lub cev dub. Tus nqi hluav taws xob ntawm tag nrho cov khoom tiag tiag nyob ntawm tsis yog nyob ntawm qhov hluav taws xob wavelength thiab qhov kub thiab txias ntawm cov khoom, tab sis kuj yog nyob ntawm hom khoom tsim los ntawm cov khoom, kev npaj, txheej txheem thermal, lub xeev thiab ib puag ncig. Yog li ntawd, txhawm rau ua kom txoj cai lij choj ntawm lub cev dub hluav taws xob siv tau rau txhua yam khoom siv, ib qho kev faib ua feem coefficient ntsig txog cov khoom siv thiab lub xeev saum npoo yuav tsum tau qhia, uas yog, emissivity. Qhov coefficient no qhia tau hais tias qhov hluav taws xob hluav taws xob nyob ze ntawm qhov khoom tiag tiag yog li cas rau cov hluav taws xob lub cev dub, thiab nws cov nqi yog nyob nruab nrab ntawm xoom thiab tus nqi tsawg dua 1. Raws li txoj cai ntawm hluav taws xob, tsuav yog qhov emissivity ntawm cov khoom paub, cov yam ntxwv ntawm infrared radiation ntawm tej yam khoom yog paub.
Cov yam tseem ceeb cuam tshuam rau emissivity yog: hom khoom, nto roughness, lub cev thiab tshuaj qauv, thiab cov khoom thickness.
Thaum siv lub ntsuas hluav taws xob hluav taws xob infrared los ntsuas qhov ntsuas kub ntawm lub hom phiaj, nws yog thawj zaug uas yuav tsum ntsuas qhov hluav taws xob infrared ntawm lub hom phiaj nyob rau hauv nws cov band range, thiab tom qab ntawd qhov ntsuas kub ntawm lub hom phiaj ntsuas yog xam los ntawm tus pas ntsuas kub. Monochromatic pyrometers yog proportional rau tus nqi ntawm hluav taws xob nyob rau hauv ib tug band; dual-xim pyrometers yog proportional rau qhov piv ntawm tus nqi hluav taws xob hauv ob pawg.
Infrared system: Lub ntsuas kub infrared yog tsim los ntawm kev kho qhov muag, photodetector, teeb liab amplifier, teeb liab ua, tso zis tso zis thiab lwm qhov chaw. Lub tshuab kho qhov muag sib sau ua ke lub hom phiaj infrared hluav taws xob hluav taws xob hauv nws qhov chaw saib, thiab qhov loj ntawm qhov kev pom yog txiav txim los ntawm qhov chaw kho qhov muag ntawm tus pas ntsuas kub thiab nws txoj hauj lwm. Lub zog infrared yog tsom rau lub photodetector thiab hloov mus rau hauv cov teeb liab hluav taws xob sib xws. Lub teeb liab dhau los ntawm lub amplifier thiab teeb liab ua Circuit Court, thiab hloov mus rau hauv tus nqi kub ntawm qhov ntsuas lub hom phiaj tom qab raug kho raws li algorithm ntawm kev kho sab hauv ntawm lub ntsuas thiab emissivity ntawm lub hom phiaj.
Dub lub cev hluav taws xob txoj cai:
Lub cev dub yog lub tshuab hluav taws xob zoo tshaj plaws, uas nqus tag nrho cov wavelengths ntawm lub zog hluav taws xob, tsis muaj kev xav lossis kev xa tawm ntawm lub zog, thiab muaj qhov emissivity ntawm 1 ntawm nws qhov chaw. Nws yuav tsum tau taw qhia tias tsis muaj lub cev dub tiag tiag hauv qhov xwm txheej, tab sis txhawm rau ua kom pom tseeb thiab tau txais txoj cai kev faib tawm ntawm cov hluav taws xob infrared, tus qauv tsim nyog yuav tsum raug xaiv hauv kev tshawb fawb theoretical, uas yog tus qauv oscillator quantized ntawm lub cev kab noj hniav hluav taws xob tau npaj tseg. los ntawm Planck, yog li muab Planck txoj cai ntawm lub cev dub hluav taws xob, uas yog, lub cev dub spectral radiance sawv cev los ntawm wavelength, yog qhov pib ntawm tag nrho cov infrared radiation theories, yog li nws yog hu ua txoj cai ntawm lub cev dub hluav taws xob.
