Wuxi Slosson txoj cai tsom xam ntawm infrared tus pas ntsuas kub emissivity
Emissivity, uas yog qhov piv ntawm lub zog ntawm lub zog ntawm ib qho khoom tiag tiag rau ntawm lub cev dub ntawm qhov kub thiab txias nyob rau hauv cov xwm txheej zoo ib yam. Los ntawm cov xwm txheej zoo ib yam peb txhais tau tias cov xwm txheej zoo ib yam (qhov chaw ntawm cov hluav taws xob tso tawm, qhov loj thiab cov kev taw qhia ntawm lub steradian lub kaum sab xis uas ntsuas lub hwj chim radiant) thiab spectral tej yam kev mob (spectral ntau yam uas lub radiant flux yog ntsuas). Txij li thaum emissivity muaj feem xyuam rau cov kev ntsuas ntsuas, muaj ntau lub ntsiab lus emissivity.
Hemispherical emissivity hemispherical emissivity yog lub zog hluav taws xob hluav taws xob tawm hauv ib cheeb tsam ntawm lub cev radiant mus rau qhov chaw hemispherical (radiant output) thiab tib qhov kub ntawm lub cev dub radiant tso tawm ntawm qhov piv, uas muab faib ua tag nrho thiab spectral tus nqi ntawm ob yam. .
Ib txwm Emissivity
Ib txwm emissivity yog ntsuas nyob rau hauv cov kev taw qhia ntawm cov hluav taws xob nto ib txwm mus rau lub me me lub tso suab lub kaum sab xis ntawm lub emissivity, nws yog ib txwm kev taw qhia ntawm lub radiant brightness thiab tib kub ntawm lub blackbody radiant brightness piv. Ib txwm emissivity yog ib qho tseem ceeb vim hais tias infrared systems tag nrho cov radiant zog nyob rau hauv ib tug me me lub tso suab lub kaum sab xis nyob rau hauv cov kev taw qhia ib txwm mus rau lub hom phiaj nto.
Rau ib tug blackbody, tag nrho cov emissivities yog sib npaug zos rau 1, thaum rau ib tug tiag tiag khoom, tag nrho cov emissivities muaj nqi tsawg tshaj li 1. Qhov peb tam sim no hu ua emissivities yog nruab nrab emissivities.
Hais txog emissivity kho:
Lub emissivity ntawm cov khoom sib txawv ntawm qhov chaw sib txawv, txhawm rau ua kom qhov tseeb ntawm qhov ntsuas kub, feem ntau yuav tsum tau kho emissivity. Txij li thaum lub pyrometer yog calibrated rau ib tug blackbody, thiab lub emissivity ntawm tej yam khoom nto yog me dua lub blackbody emissivity.
Kev kho emissivity ntawm tus pas ntsuas kub infrared yog: raws li qhov emissivity ntawm cov khoom sib txawv los kho lub amplifier amplification, yog li ntawd nrog rau qee qhov kub ntawm cov khoom siv hluav taws xob hauv lub cev ua rau tib lub teeb liab nrog qhov kub thiab txias ntawm lub cev dub uas tsim los ntawm cov khoom siv hluav taws xob. teeb liab. Piv txwv li, qhov emissivity ntawm ib yam khoom yog {{0}}.8, ces koj yuav tsum tau nce lub amplifier amplification rau tus thawj 1/0.8=1.25 zaus. Nyob rau hauv kev lag luam teb vim qhov ntsuas ntawm lub hom phiaj cov khoom, cov duab thiab lub xeev nto yog txawv, nws yog feem ntau nyuaj los txiav txim lub hom phiaj emissivity tsis. Muaj lwm yam uas tshwm sim los ntawm kev ntsuas qhov yuam kev yuav ua rau qhov ntsuas qhov ntsuas thiab tus nqi tiag tiag ntawm qhov sib txawv. Kev taw qhia ntawm emissivity parameter hloov kho tuaj yeem daws qhov teeb meem no yam tsis muaj kev cuam tshuam rau kev ntsuas linearity. Kev hloov kho tuaj yeem ua tau raws li qhov ntsuas kub ntawm qhov ntsuas kub ntawm cov txheej txheem hauv qab no:
Piv txwv li, qhov ntau ntawm cov pyrometer yog 500-1400 degree .
Qhov ntsuas kub tiag tiag yog 1200 degree, ntsuas kub yog 1150 degree.
Lub sijhawm no, emissivity parameter tuaj yeem hloov kho rau:
(1150-500)÷(1200-500)=0.928≈0.93
Tom qab xws li kev hloov kho kom ntsuas tus nqi ze rau tus nqi tiag tiag, koj tuaj yeem xa mus rau "cov ntaub ntawv emissivity coefficient table" kev hloov kho. Txawm li cas los xij, cov kev txwv hauv cov lus no tsis tas yuav siv tau rau cov txheej txheem xav tau. Nws yuav tsum tau ua kom pom tseeb tias cov ntsiab lus ntawm qhov kev hloov pauv emissivity yog qhia los kho qhov kev ntsuas qhov yuam kev.
