The concrete working principle of platinum-rhodium thermocouple

Actually platinum-rhodium thermocouple is actually an energy converter, platinum, rhodium thermocouple main function is to convert heat energy into electrical energy, and then use its produce thermoelectric potential for temperature measurement, platinum, rhodium thermocouple in the thermoelectric potential needs to be noted when using the following:

the first: because the platinum-rhodium thermocouple of thermoelectric potential is a function of its two end temperature difference, rather than platinum rhodium thermocouple side and cold side temperature difference functions; In the second: platinum rhodium thermocouple thermoelectric potential size, if platinum rhodium thermocouple of all materials are in a state of uniform, and platinum rhodium thermocouple diameter, length is not any relations, only and platinum rhodium thermocouple temperature and composition at the ends of the material. : if the two determines the platinum-rhodium thermocouple accidentally silk material composition, platinum, rhodium thermocouple in the size of the thermoelectric potential, is the only existing relationships and platinum-rhodium thermocouple temperature difference, if platinum-rhodium thermocouple cold end temperature is to keep the same, then platinum rhodium thermocouple thermoelectric potential exists only in the work the temperature function value. Two kinds of different materials together, the thermoelectric potential size is different, between the two will certainly produce electromotive force, so in the process of circuit can form different to the size of the current. The platinum rhodium thermocouple is precisely using this effect to work.