Thermocouple Thermometer - Thermoelectric Effect Temperature Measurement
txhais:
Ib khub ntawm cov conductors ua los ntawm cov khoom sib txawv uas tsim hluav taws xob hluav taws xob hauv Circuit Court raws li cov nyhuv Seebeck. Ib khub ntawm cov conductors ua los ntawm cov khoom sib txawv txuas ntawm ib kawg, thiab lub ntsiab lus rhiab rau kev ntsuas kub siv lawv cov nyhuv thermoelectric.
Cov ntsiab lus:
Thermocouple yog qhov ntsuas kub thiab ntsuas ntsuas. Nws ncaj qha ntsuas qhov kub thiab txias thiab hloov cov teeb liab kub rau hauv lub teeb liab muaj peev xwm thermoelectric, uas tom qab ntawd hloov mus rau qhov ntsuas kub ntawm qhov nruab nrab ntsuas los ntawm cov cuab yeej hluav taws xob (cov cuab yeej thib ob). Lub hauv paus ntsiab lus ntawm kev ntsuas kub ntawm thermocouple yog tias ob lub conductors nrog cov sib txawv sib txawv tsim ib lub voj voog kaw. Thaum muaj qhov kub thiab txias ntawm ob qho kawg, tam sim no yuav ntws los ntawm lub voj voog, thiab yuav muaj lub zog hluav taws xob - thermoelectric force - nruab nrab ntawm ob qhov kawg, uas yog hu ua Seebeck effect. Ob homogeneous conductors nrog sib txawv compositions yog cov thermoelectric electrodes, nrog rau qhov kub siab tshaj qhov kawg raws li qhov ua hauj lwm kawg thiab qhov kub qis kawg li qhov kawg dawb, uas feem ntau yog qhov kub thiab txias. Tsim ib lub rooj calibration thermocouple raws li kev sib raug zoo ntawm cov thermoelectric tej zaum thiab kub; Lub rooj calibration tau txais nyob rau hauv cov xwm txheej ntawm qhov kub thiab txias ntawm 0 degree, thiab cov thermocouples sib txawv muaj cov rooj sib txawv. Thaum cov khoom siv hlau thib peb txuas nrog lub thermocouple Circuit Court, ntev npaum li qhov kub ntawm ob qhov kev sib cuag ntawm cov khoom yog tib yam, lub peev xwm thermoelectric uas tsim los ntawm cov thermocouple yuav nyob twj ywm tsis hloov thiab yuav tsis cuam tshuam los ntawm kev sib txuas ntawm cov hlau thib peb rau hauv Circuit Court. Yog li ntawd, thaum siv cov thermocouples rau qhov ntsuas kub, lub ntsuas ntsuas tuaj yeem txuas nrog ntsuas qhov ntsuas kub, thiab qhov ntsuas kub ntawm qhov ntsuas nruab nrab tuaj yeem txiav txim siab. Thaum ntsuas qhov ntsuas kub nrog lub thermocouple, nws yuav tsum ntsuas qhov kub ntawm nws qhov txias kawg (qhov ntsuas qhov kawg yog qhov kub kawg, thiab qhov kawg txuas nrog ntsuas ntsuas hluav taws xob los ntawm cov hlau lead yog hu ua qhov txias kawg) nyob twj ywm, yog li ntawd qhov loj ntawm nws cov thermoelectric peev xwm yog proportional rau qhov ntsuas kub. Yog tias qhov kub hloov pauv ntawm qhov txias kawg thaum ntsuas, nws yuav cuam tshuam rau qhov tseeb ntawm qhov ntsuas. Kev siv qee yam kev ntsuas los them nyiaj rau qhov cuam tshuam los ntawm kev hloov pauv kub ntawm qhov txias txias yog hu ua txias kawg them nyiaj ntawm thermocouples. Daim ntawv txuas: Kev suav cov txheej txheem rau cov thermocouple txias junction them nyiaj: Los ntawm millivolts mus rau qhov kub thiab txias: ntsuas qhov kub ntawm qhov sib txuas, hloov mus rau tus nqi millivolt, ntxiv rau millivolt tus nqi ntawm cov thermocouple, thiab hloov mus rau qhov kub. Los ntawm qhov kub thiab txias rau millivolts: ntsuas qhov ntsuas kub thiab txias kawg, hloov mus rau millivolts, rho tawm kom tau txais tus nqi millivolt, thiab tom qab ntawd tau txais qhov kub thiab txias.
