Thermocouple Thermometer - Thermoelectric Effect Temperature Measurement
txhais:
Ib khub ntawm cov khoom siv sib txawv uas tsim cov hluav taws xob hluav taws xob hauv Circuit Court raws li cov nyhuv Seebeck. Ib khub ntawm cov khoom siv sib txawv uas sib txuas ua ke ntawm ib qho kawg thiab siv lawv cov nyhuv thermoelectric kom ua tiav qhov ntsuas kub.
Txheej txheem cej luam:
Lub thermocouple yog qhov ntsuas kub thiab ntsuas ntsuas. Nws ncaj qha ntsuas qhov kub thiab txias, hloov cov teeb liab kub mus rau hauv lub thermal electromotive quab yuam teeb liab, thiab hloov nws mus rau hauv qhov ntsuas kub ntawm qhov nruab nrab ntsuas los ntawm qhov ntsuas hluav taws xob (tseem ceeb ntsuas). Lub hauv paus ntsiab lus ntawm kev ntsuas kub ntawm thermocouple yog tias ob lub conductors ntawm cov khoom sib txawv tsim ib lub voj kaw. Thaum muaj qhov kub thiab txias ntawm ob qhov kawg, ib qho tam sim no yuav dhau los ntawm lub voj voog. Lub sijhawm no, muaj lub zog hluav taws xob - thermal electromotive force - nruab nrab ntawm ob qhov kawg. Qhov no Nws yog qhov hu ua Seebeck effect. Ob homogeneous conductors nrog sib txawv compositions yog kub electrodes. Qhov kawg nrog qhov kub siab dua yog qhov ua haujlwm kawg, thiab qhov kawg nrog qhov kub qis dua yog qhov kawg dawb. Qhov kawg dawb yog feem ntau ntawm qhov kub thiab txias. Raws li kev sib raug zoo ntawm cov thermoelectromotive quab yuam thiab qhov kub thiab txias, lub thermocouple indexing rooj yog tsim; lub rooj indexing tau txais thaum qhov kub dawb kawg yog 0 degree . Cov thermocouples sib txawv muaj cov rooj sib txawv indexing.
Thaum cov khoom siv hlau thib peb txuas nrog lub voj voog thermocouple, ntev npaum li qhov kub ntawm ob lub pob qij txha ntawm cov khoom yog tib yam, lub peev xwm thermoelectric uas tsim los ntawm cov thermocouple yuav nyob twj ywm tsis hloov, uas yog, nws yuav tsis cuam tshuam los ntawm qhov thib peb. hlau raug ntxiv rau lub voj. Yog li ntawd, thaum ntsuas qhov ntsuas kub ntawm lub thermocouple, lub ntsuas ntsuas tuaj yeem txuas nrog. Tom qab ntsuas lub thermal electromotive quab yuam, qhov ntsuas kub ntawm qhov ntsuas nruab nrab tuaj yeem paub. Thaum ntsuas qhov ntsuas kub ntawm lub thermocouple, nws yuav tsum tau ntsuas qhov kub ntawm nws qhov txias kawg (qhov ntsuas qhov kawg yog qhov kub kawg, thiab qhov kawg txuas nrog lub ntsuas hluav taws xob los ntawm cov hlau lead yog hu ua qhov txias kawg) nyob twj ywm, yog li ntawd cov thermoelectric. peev xwm yog proportional rau qhov ntsuas kub. Yog tias qhov ntsuas kub (ib puag ncig) ntawm qhov txias kawg hloov thaum ntsuas, qhov tseeb ntawm qhov ntsuas yuav raug cuam tshuam loj heev. Kev siv qee yam kev ntsuas ntawm qhov txias kawg los them rau cov teebmeem tshwm sim los ntawm kev hloov pauv ntawm qhov txias txias yog hu ua txias kawg them nyiaj ntawm thermocouples. Txuas: Thermocouple txias kawg them nyiaj txoj kev suav: los ntawm millivolts mus rau qhov kub thiab txias: ntsuas qhov txias kawg kub, hloov mus rau tus nqi millivolt, ntxiv rau millivolt tus nqi ntawm lub thermocouple, thiab hloov qhov kub. Los ntawm qhov kub thiab txias mus rau millivolts: ntsuas qhov ntsuas kub thiab txias kawg, hloov mus rau millivolts feem, thiab rho tawm kom tau txais tus nqi millivolt, uas yog qhov kub thiab txias.
