Suitable for Atlas pressure sensor P165-5183 B1203-072

Thermoelectric effect of sensor

Semiconductor materials have high thermoelectric potential and can be successfully used to make small thermoelectric refrigerators. Fig. 1 shows a thermocouple refrigeration element composed of an n-type semiconductor and a p-type semiconductor. The N-type semiconductor and the P-type semiconductor are connected into a loop by copper plates and copper wires, and the copper plates and copper wires only play a conductive role. At this point, one contact becomes hot and one contact becomes cold. If the current direction is reversed, the cold and hot action at the node is reciprocal.

The output of thermoelectric refrigerator is generally very small, so it is not suitable for large-scale and large-scale use. However, because of its strong flexibility, simplicity and convenience, it is very suitable for micro-refrigeration field or cold places with special requirements.

The theoretical basis of thermoelectric refrigeration is the thermoelectric effect of solid. When there is no external magnetic field, it includes five effects, namely heat conduction, Joule heat loss, Seebeck effect, Peltire effect and Thomson effect.

General air conditioners and refrigerators use fluoride chloride as refrigerant, which causes the ozone layer to be destroyed. Refrigerant-free refrigerators (air conditioners) are therefore an important factor in environmental protection. Using the thermoelectric effect of semiconductors, a refrigerant-free refrigerator can be made.

This power generation method directly converts thermal energy into electric energy, and its conversion efficiency is limited by Carnotefficiency, the second law of thermodynamics. As early as 1822, Xibe discovered it, so the thermoelectric effect is also called Seebeckeffect.

It is not only related to the temperature of the two junctions, but also to the properties of the conductors used. The advantage of this power generation method is that it has no rotating mechanical parts and will not be worn, so it can be used for a long time. However, to achieve high efficiency, a heat source with high temperature is needed, and sometimes several layers of thermoelectric substances are cascade or staged to achieve high efficiency.