Emissivity Analysis ntawm Infrared Thermometer
Emissivity yog qhov piv ntawm lub zog radiant ntawm ib yam khoom tiag tiag rau lub cev dub ntawm tib qhov kub thiab txias nyob rau tib lub sijhawm. Cov xwm txheej zoo ib yam yog hais txog tib lub geometric tej yam kev mob (qhov hluav taws xob emission cheeb tsam, lub kaum ntse ntse loj thiab kev taw qhia rau kev ntsuas lub zog hluav taws xob) thiab spectral tej yam kev mob (spectral range rau ntsuas radiant flux). Txij li thaum emissivity nyob ntawm qhov ntsuas ntsuas, muaj ntau lub ntsiab lus emissivity.
Hemispheric emissivity Hemispheric emissivity yog qhov piv ntawm cov hluav taws xob hluav taws xob hluav taws xob (cov hluav taws xob tawm hluav taws xob) tawm los ntawm lub tshuab hluav taws xob hauv ib cheeb tsam mus rau qhov chaw hemispherical thiab cov hluav taws xob tawm ntawm lub cev dub ntawm tib qhov kub, uas tau muab faib ua ob hom: tag nrho cov nyiaj thiab tus nqi spectral.
ib txwm emissivity
Ib txwm emissivity yog cov emissivity ntsuas nyob rau hauv ib tug me me lub kaum sab xis nyob rau hauv ib txwm kev coj ntawm lub radiating nto, thiab nws yog qhov ratio ntawm lub radiance nyob rau hauv lub qub kev coj mus rau lub radiance ntawm ib tug dub lub cev nyob rau hauv tib lub kub. Txij li cov tshuab infrared pom lub zog hluav taws xob nyob rau hauv ib qho khoom me me ib txwm rau lub hom phiaj saum npoo, ib txwm emissivity yog qhov tseem ceeb.
Rau lub cev dub, tag nrho cov emissivity qhov tseem ceeb yog sib npaug rau 1, thaum rau cov khoom tiag, tag nrho cov emissivity qhov tseem ceeb yog tsawg dua 1. Qhov emissivity peb tham txog tam sim no yog qhov nruab nrab emissivity.
Hais txog emissivity kho:
Qhov 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 ntsuas kub ntsuas tau ntsuas nrog lub cev dub, qhov emissivity ntawm txhua yam khoom me dua li ntawm lub cev dub.
Txoj kev kho emissivity ntawm tus pas ntsuas kub infrared yog: kho qhov loj ntawm lub amplifier raws li emissivity ntawm cov khoom sib txawv, kom lub teeb liab tsim los ntawm hluav taws xob ntawm ib qho khoom tiag tiag nrog rau qee qhov kub hauv qhov system yog tib yam li cov khoom tsim los ntawm ib lub cev dub nrog qhov kub thiab txias. tib lub teeb liab. Piv txwv li, yog tias qhov emissivity ntawm ib yam khoom yog {{0}}.8, nws yog ib qho tsim nyog yuav tsum tau nce qhov loj ntawm lub amplifier mus rau qhov qub 1/0.8=1.25 zaug. Hauv kev lag luam, feem ntau nyuaj rau kev txiav txim siab lub hom phiaj emissivity tsis vim qhov sib txawv ntsuas cov khoom siv, cov duab thiab lub xeev. Kev ntsuas yuam kev tshwm sim los ntawm lwm yam yuav ua rau qhov sib txawv ntawm qhov ntsuas tus nqi thiab tus nqi tiag. Kev taw qhia ntawm emissivity parameter hloov kho tuaj yeem daws qhov teeb meem no zoo yam tsis muaj kev cuam tshuam rau kev ntsuas linearity. Nws tuaj yeem hloov kho raws li cov kauj ruam hauv qab no raws li kev paub kub lossis txheej txheem kub:
Piv txwv li: qhov ntsuas qhov ntsuas qhov ntsuas kub yog: 500-1400 degree
Qhov ntsuas kub tiag tiag yog 1200 degree, ntsuas kub yog 1150 degree,
Hauv qhov no, emissivity parameter tuaj yeem hloov kho raws li:
(1150-500)÷(1200-500)=0.928≈0.93
Qhov kev hloov kho no ua rau qhov ntsuas tus nqi ze dua rau tus nqi tiag tiag, thiab tuaj yeem hloov kho los ntawm kev xa mus rau "Cov Khoom Siv Emissivity Coefficient Table". Tab sis qhov tsis muaj nyob hauv cov lus no tsis tas yuav siv tau rau cov txheej txheem xav tau. Nws yuav tsum paub meej tias cov ntsiab lus qhia los ntawm kev hloov pauv emissivity yog los kho qhov kev ntsuas qhov yuam kev.
