Kev tshawb fawb ntawm Txoj Kev Sib Piv ntawm Tus Kheej Calibration yuam kev rau Infrared Thermometers
Blackbody hluav taws xob thiab infrared ntsuas kub ntsuas cov qauv
Tag nrho cov khoom uas muaj qhov kub thiab txias tshaj li xoom yog tas li emitting infrared hluav taws xob hluav taws xob mus rau qhov chaw nyob ib puag ncig. Qhov loj thiab wavelength faib ntawm infrared hluav taws xob hluav taws xob ntawm ib yam khoom yog ze ze rau nws qhov kub thiab txias. Yog li ntawd, los ntawm kev ntsuas lub zog infrared tawm los ntawm cov khoom nws tus kheej, qhov kho qhov muag ntawm tus pas ntsuas kub hloov mus rau hauv lub teeb liab hluav taws xob ntawm lub ntsuas ntsuas thiab qhia txog qhov kub thiab txias ntawm cov khoom ntsuas los ntawm cov zaub ib feem ntawm lub ntsuas kub infrared, ua kom muaj kev ntsuas qhov tseeb. nws qhov kub thiab txias, Qhov no yog lub hauv paus rau lub hauv paus rau infrared radiation kub ntsuas.
Cov yam ntxwv ntawm tus pas ntsuas kub infrared: ntsuas tsis sib cuag, ntsuas qhov kub ntawm qhov dav, teb ceev ceev, thiab siab rhiab heev. Txawm li cas los xij, vim muaj kev cuam tshuam ntawm emissivity ntawm cov khoom ntsuas, nws yuav luag tsis tuaj yeem ntsuas qhov ntsuas kub ntawm cov khoom ntsuas, thiab ntsuas qhov kub ntawm qhov chaw.
Tus txheej txheem calibration rau infrared thermometers yog siv lub blackbody rauv calibration. Blackbody hais txog ib yam khoom uas muaj qhov nqus nqus sib npaug li 1 rau txhua qhov wavelengths ntawm qhov teeb meem hluav taws xob nyob rau txhua qhov xwm txheej. Blackbody yog tus qauv zoo tshaj plaws, yog li qhia txog hluav taws xob coefficient uas txawv nrog cov khoom siv thiab lub xeev nto, uas yog emissivity. Nws lub ntsiab txhais yog qhov piv ntawm cov hluav taws xob kev ua tau zoo ntawm cov khoom tiag tiag rau ntawm lub cev dub ntawm tib qhov kub. Cov hluav taws xob thiab nqus cov hluav taws xob infrared ntawm ib qho khoom ua raws li Kirchhoff txoj cai. Thaum ib lub teeb hluav taws xob tau npaj rau saum npoo ntawm txhua yam khoom, raws li lub hauv paus ntsiab lus ntawm kev txuag hluav taws xob, qhov sib npaug ntawm qhov nqus, kev xav, thiab kev xa tawm ntawm qhov teeb meem hluav taws xob ntawm cov khoom yuav tsum sib npaug rau 1. Feem ntau, qhov emissivity yog tsis yooj yim rau kev ntsuas, thiab feem ntau tuaj yeem txiav txim siab los ntawm kev ntsuas qhov nqus nqus. Yog li ntawd, blackbody hluav taws xob qhov chaw yog siv raws li cov qauv hluav taws xob los xyuas qhov kev siv hluav taws xob ntawm ntau qhov chaw hluav taws xob infrared.
Lub ntsuas kub infrared muaj lub tshuab kho qhov muag, photodetector, lub teeb liab amplifier, teeb liab ua, tso zis tawm, thiab lwm yam khoom. Cov kab hluav taws xob ntawm cov khoom kuaj thiab qhov kev cuam tshuam yog demodulated los ntawm lub modulator thiab nkag mus rau hauv infrared detector. Qhov sib txawv ntawm ob lub teeb liab yog amplified los ntawm qhov rov qab amplifier thiab qhov kub ntawm cov lus tawm tswv yim yog tswj, kom lub spectral radiance ntawm cov lus tawm tswv yim yog tib yam li cov spectral radiance ntawm cov khoom. Cov zaub qhia qhov ci thiab qhov kub thiab txias ntawm cov khoom ntsuas. Qhov ntsuas kub ntsuas los ntawm tus ntsuas kub infrared yog qhov hluav taws xob kub ntawm qhov khoom es tsis yog qhov ntsuas kub ntawm qhov khoom. Txij li thaum lub cev tsis muaj tseeb tsis muaj nyob, tag nrho cov hluav taws xob thermal ntawm cov khoom tiag tiag yog ib txwm me dua li tag nrho cov hluav taws xob blackbody nyob rau tib qhov kub. Yog li ntawd, qhov ntsuas kub ntsuas los ntawm lub ntsuas kub infrared yuav tsum tau tsawg dua qhov ntsuas kub ntawm qhov khoom. Thaum ntsuas kub, qhov emissivity ntawm tus pas ntsuas kub infrared yuav tsum tau teem kom ntau li ntau tau (rau cov ntsuas kub infrared nrog adjustable emissivity) mus rau tib tus nqi emissivity raws li cov khoom ntsuas, thiab ntsuas tus nqi yuav tsum ua raws li qhov tseeb kub ntawm cov khoom ntsuas. ntau li ntau tau.
Taw qhia rau Tus Kheej Calibration Method ntawm Infrared Thermometer
Qhov tseem ceeb tshaj plaws los xyuas kom meej qhov tseeb ntawm cov ntsuas kub infrared yog emissivity, qhov deb ntawm qhov chaw, qhov chaw ntawm qhov chaw, thiab qhov chaw pom. Los ntawm kev sib txuas lus thiab kev sab laj nrog infrared ntsuas kub cov kws tshaj lij thiab cov kws tshaj lij los ntawm cov cuab yeej tsim khoom, thiab los ntawm ntau txoj hauv kev rov ua dua, cov khoom siv ntsuas ntsuas tau ua tus kheej raws li lub hauv paus ntsiab lus ntawm blackbody furnace. Qhov ua tau ntawm tus kheej calibration thiab kev sib piv ntawm txoj kev no tau txheeb xyuas los ntawm kev sib piv. Ua kom tiav qhov kev sib piv ntawm qhov yuam kev yooj yim, qhov cuam tshuam ntawm kev ntsuas kev ncua deb, thiab kev txiav txim siab ntawm qhov ntau ntawm emissivity nyob rau hauv tus kheej calibration raws sij hawm. Ua ntej kev sim, kho tus ntsuas kub infrared rau nws lub xeev zoo ua ntej siv nws rau qhov chaw sim.
