Entwodiksyon Thermocouples ak Prensip Mezi Tanperati

1, Entwodiksyon nan Thermocouples
Anrejistrè tanperati tèmoelektrik souvan itilize tèrmokapteur kòm eleman mezire tanperati. Yo lajman itilize pou mezire tanperati ki nan ranje -200 degre a 1300 degre. Nan ka espesyal, yo ka mezire tanperati ki wo jiska 2800 degre oswa tanperati ki ba jiska 4K. Yo gen karakteristik estrikti senp, pri ki ba, gwo presizyon, ak lajè ranje mezi tanperati. Akòz tèrmokapteur konvèti tanperati a nan elektrisite pou deteksyon, mezi tanperati, kontwòl, ak anplifikasyon ak transfòmasyon nan siyal tanperati yo trè pratik, Apwopriye pou mezi longdistans ak kontwòl otomatik. Nan metòd mezi tanperati kontak, aplikasyon tèmomèt tèmoelektrik gaye toupatou.
2, prensip mezi tanperati Thermocouple:
Definition: A sensor composed of two conductors that converts temperature into thermoelectric electromotive force is called a thermocouple. 2. Temperature measurement principle: The temperature measurement principle of a thermocouple is based on the thermoelectric effect. Two different materials of conductors A and B are connected in series to form a closed circuit. When the temperatures of contact 1 and 2 are different, if T>T0 (as shown in Figure 12-1 thermoelectric effect), a thermoelectric electromotive force will be generated in the circuit, and a certain amount of current will be generated in the circuit. This phenomenon is called thermoelectric effect. The thermoelectric electromotive force is denoted as EAB, and conductors A and B are called thermoelectric electrodes. Contact 1 is usually welded together and placed in a temperature measuring location to sense the measured temperature, hence it is called the measuring end (or working end, hot end). Contact 2 requires a constant temperature and is called the reference end (or cold end). 3. Thermoelectric effect: The closed circuit of a thermocouple composed of conductors A and B has two contact potentials, eAB (T) and eAB (T0), respectively, at the two junctions. Additionally, because T>T{{0}}, gen yon potansyèl diferans tanperati nan kondiktè A ak B. Se konsa, total fòs elektwomotè tèrmoelektrik EAB (T, T0) sikwi fèmen a ta dwe sòm aljebrik la. fòs elektwomotif kontak la ak fòs elektwomobil diferans tanperati a, se sa ki, 4. Pou tèrmokapteur a chwazi, lè tanperati referans a konstan, fòs elektwomobil total tèrmoelektrik la vin tounen yon fonksyon valè sèl nan tanperati fen mezi T, se sa ki, EAB ( T, T0)=f (T). Sa a se prensip debaz mezi tanperati lè l sèvi avèk tèrmokapteur. Nan mezi tanperati aktyèl la, li nesesè prezante fil konekte ak enstriman nan bouk la fèmen nan tèrmokapteur la.