Thermocouple vs Thermistor
Thermocouples thiab thermistor yog ob hom twj uas siv los ntsuas thiab ntsuas kub. Thermocouple feem ntau yog siv los ntsuas qhov ntsuas kub ua ke nrog lub voltmeter lossis cathode ray oscilloscope. Lub thermistor yog ib qho khoom siv hluav taws xob uas hloov nws qhov kev tiv thaiv hauv kev teb rau qhov kub thiab txias. Ob qho ntawm cov khoom no tseem ceeb heev hauv kev ntsuas thiab tswj qhov kub thiab txias ntawm lub tshuab. Thermocouples thiab thermistor yog dav siv nyob rau hauv ntau qhov chaw hauv physics thiab instrumentation. Nws yog ib qho tseem ceeb kom muaj kev nkag siab zoo hauv cov thermocouples thiab cov thermistor kom ua tau zoo hauv cov haujlwm no. Hauv tsab xov xwm no, peb yuav tham txog dab tsi thermocouple thiab thermistor yog dab tsi, lawv cov ntawv thov, kev ua haujlwm theories tom qab thermocouple thiab thermistor, lawv qhov zoo sib xws, thiab thaum kawg qhov txawv ntawm thermocouple thiab thermistor.
Ib lub thermocouple yog ib qho ntawm cov cuab yeej tseem ceeb tshaj plaws siv hauv kev ntsuas kub. Lub thermocouple muaj qhov sib txuas ntawm ob qhov sib txawv ntawm cov hlau. Thaum xws li ib qho kev sib tshuam raug tshav kub, qhov kev sib tshuam tsim hluav taws xob. Qhov voltage no ntsuas thoob plaws qhov sib tshuam. Ib qho kev hloov kho ntawm cov thermocouple yog tsim los ntawm kev tso cov hlau sib txawv ntawm ob feem ntawm lwm cov hlau. Qhov no ua rau ob qho kev sib tshuam. Ib qho kev sib txuas yog khaws cia ntawm qhov ntsuas kub xws li dej uas sib cuag nrog dej khov (qhov ntsuas kub rau 0 0 C). Qhov kev hloov pauv ntawm cov thermocouple no tuaj yeem ntsuas qhov ntsuas qhov sib txawv ntawm qhov ntsuas kub thiab qhov ntsuas kub. Lub thermocouple absorbs yuav luag tsis muaj cua sov los ntawm qhov ntsuas qhov ntsuas, thiab qhov rhiab heev ntawm lub thermocouple yog qhov qis dua piv rau lwm txoj kev ntsuas, tab sis nws muaj qhov ntsuas qhov loj heev. Lub thermocouple ua haujlwm raws li Zeebeck nyhuv.
Thermistor
Thermistor yog hom resistor. Lub sij hawm thermistor los ntawm "thermal" thiab "resistor". Lub thermistor hloov nws qhov tsis kam teb rau qhov kev ua haujlwm kub ntawm lub cuab yeej. Muaj ob hom kev thermistor. Positive kub coefficient (PTC) thermistors nce lawv cov kev tiv thaiv sab hauv hauv kev teb rau qhov kub nce ntxiv. Tsis zoo kub coefficient (NTC) thermistor txo lawv cov kev tiv thaiv sab hauv teb rau qhov kub nce ntxiv.
PTC thermistor yog siv dav hauv cov ntawv thov xws li fuses thiab ntsuas kub. Thermistor feem ntau tuaj yeem ua haujlwm hauv qhov kub ntawm -90 0 C txog 130 0 C. Cov khoom siv hauv cov thermistor yog cov polymer lossis cov ceramic uas muaj qhov kub thiab txias - cov khoom ua haujlwm, uas tsim nyog rau lub thermistor. NTC thermistor feem ntau yog siv rau hauv qhov ntsuas kub qis thiab lwm lub tshuab uas yuav tsum tau ua kom muaj qhov ntsuas kub qis dua.
Dab tsi yog qhov sib txawv ntawm cov thermistor thiab thermocouple?
