The application and classification of thermoelectric potential thermocouple

Actually thermocouple should belong to the energy conversion device, mainly thermal energy can be directly converted into electricity, and by using the conversion process of thermoelectric potential temperature measurement, so it is very important to the use of thermoelectric potential, and the thermocouple thermoelectric potential in terms of use, we should pay attention to the following contents:

one, the thermocouple thermoelectric potential mainly refers to the work end temperature difference in function, not the work of the thermocouple terminal or cold end, and between the two end temperature of the main function of the said.

in the second, and the thermocouple thermoelectric potential on the size, if the thermocouple in the entire history of the material is uniform, so and thermocouple on the diameter and length does not exist any relationship, so just and thermoelectric materials, as well as material composition, temperature difference.

3, when determining the material composition of thermocouple, thermocouple thermoelectric potential on the size of basic will only and the relationship between the temperature, if, on the thermocouple cold end temperature is consistent, then the thermocouple to be just the thermoelectric potential of single value function.

but if the two different material welding, can lead to a phenomenon of thermocouples in a closed loop, when the temperature difference between both, then electromotive force will appear, and on the way back to the formation of different sizes of current, we can attribute the phenomenon called the thermoelectric effect directly.

and thermocouple still belongs to the components of heat, can measure the temperature of the directly, and effectively convert temperature signal directly into the signal of thermoelectric emfs, and use the electric meter to measure the medium temperature transformation, thermocouple on the principle of temperature measurement, the main can be divided into two kinds of different forms, but the basic are made up of closed loop, if appear temperature gradient on both ends, then the current will appear in the circuit.

when the thermocouple at both ends will appear thermal electromotive force, also is our common seebeck effect. This two kinds of completely different ingredients, basic it is conductor or hot electrode, and the temperature on the high side should be work side, the temperature is a little lower end free end, under normal circumstances, the free end are basically remain under the condition of constant temperature, according to the function of thermoelectric emfs, manufacturing into the thermocouple indexing table, so different thermocouple on the indexing table is also completely different.