Wuxi sedossen txoj kev soj ntsuam ntawm lub emissivity ntawm infrrared thermometers
Emissivity yog qhov piv ntawm lub zog ci ntsa iab ntawm qhov khoom siv tiag tiag rau ntawm tus neeg dub tib yam nyob hauv tib qho kev mob. Qhov thiaj li hu ua ib yam kev mob zoo ib yam (emission radiation cheeb tsam thiab kev ntsuas lub zog hluav taws xob (spectral ntau yam rau kev ntsuas hluav taws xob flux). Vim yog qhov sib thooj ntawm kev ua haujlwm thiab ntsuas kev ntsuas, muaj ob peb txhais cov lus txhais ntawm kev ua haujlwm.
Hemissires yog qhov sib piv ntawm lub zog hluav taws xob flux (emissivity) emissivity) emissivity) emissivity) emissiver los ntawm kev ua haujlwm ntawm cov neeg dub nyob rau tib qho kub. Nws tau muab faib ua ob hom: tag nrho emissivity thiab spectral emissivity emissivity.
Kev Raug Mob Li Qub
Kev ua tau zoo li qub yog lub emissivity ntsuas hauv ib qho me me ua lub kaum sab xis ntawm cov kev taw qhia radiating. Nws yog tus piv ntawm lub radiance nyob rau hauv ib txwm kev coj mus rau lub radiance ntawm ib tug neeg dub ntawm tib qho kub. Vim tias qhov tseeb tias lub tshuab hluav taws xob nthuav dav hluav taws xob tsis pub dhau lub hom phiaj ntawm lub hom phiaj ntawm lub hom phiaj, ib txwm emissivity yog qhov tseem ceeb.
Rau Blackbodies, txhua qhov kev ua tau muaj nuj nqis yog sib npaug rau 1, thaum ua rau cov khoom tiag tiag, txhua qhov kev xaiv tau tsawg dua 1. Lub Emissivity tam sim no yog qhov tseem ceeb rau yog qhov nruab nrab yog qhov nruab nrab emissivity.
Hais txog emissivity kho:
Kev ua emissivity ntawm cov khoom sib txawv sib txawv, thiab txhawm rau kom paub tseeb qhov tseeb ntawm kev ntsuas kub, emissivity kho kho yog feem ntau yuav tsum muaj. Vim yog qhov tseeb tias tus pas ntsuas kub yog ntsuas nrog tus neeg dub, lub emissivity ntawm cov khoom saum npoo me me dua li ntawm tus neeg dub.
Cov txheej txheem ntawm emissivity calibration rau infrared thoj Piv txwv li, yog tias lub emissivity ntawm ib qho khoom yog {{0}}}}}}. 25 zaug tus thawj. Txawm li cas los xij, nyob rau hauv cov chaw muaj kev lag luam, nws yog feem ntau nyuaj los txiav txim siab lub hom phiaj uas yog cov khoom siv sib txawv vim yog cov ntaub ntawv sib txawv, cov ntsiab lus, thiab cov xeev ntsuas. Kev ntsuas tsis raug tshwm sim los ntawm lwm cov yam ntxwv tuaj yeem ua rau qhov sib txawv ntawm cov txiaj ntsig ntsuas thiab qhov tseem ceeb. Cov lus qhia ntawm kev hloov kho kev hloov kho tau zoo tuaj yeem daws cov teeb meem no yam tsis muaj kev cuam tshuam rau kev ntsuas ua si. Raws li kev paub kub lossis txheej txheem ntsuas kub, kho raws li cov theem hauv qab no:
Piv txwv li, qhov ntau ntawm tus pas ntsuas kub yog 500-1400 degree
Qhov kub tiag yog 1200 degree, thiab ntsuas kub yog 1150 degree,
Txij ntawm no, emissivity parameter tuaj yeem hloov kho rau:
({{{{{{0}}}}}}} =0. 928 ≈ 0.93
Tom qab cov kev hloov kho no, ntsuas qhov tseem ceeb yog ze rau qhov tseeb qhov tseem ceeb, thiab tseem tuaj yeem kho tau raws li cov ntaub ntawv hluav taws xob "hluav taws xob cov ntaub ntawv". Tab sis cov tsis muaj nyob hauv cov lus no yuav siv tsis tau rau cov txheej txheem tseev kom muaj. Nws yuav tsum tau qhia meej tias lub ntsiab lus ntawm kev hloov kho lub npe yog txhawm rau kho qhov yuam kev uas yog qhov yuam kev.
