The difference between ordinary electronic thermometer and solar thermometer

There are two kinds of electronic thermometer meter, one kind is ordinary electronic thermometer, energy is button battery; Another kind is electronic thermometer, energy is solar energy, in the case of solar energy is insufficient, button batteries as the standby energy use. The principle of the electronic thermometer is the use of metal or metal oxide semiconductor as a conductor temperature medium, using its changes over temperature resistance as temperature measurement, used for temperature measurement instrument. And solar electronic thermometer mainly on the basis of the electronic thermometer, more environmentally friendly use of solar cells, solar cells based on semiconductor materials, photoelectric conversion, in the aftermath of the use of photoelectric materials absorb light energy to make it an electrical current. The working principle of the solar cell is through the photoelectric effect or photochemical effect of the light energy into electricity directly to the device. When the sun to the semiconductor, some of the surface reflection out, the rest is absorbed by the semiconductor or through. Light that is absorbed, of course, there are some become hot, others of photons with semiconductor valence electron impact, and produce electronic & ndash; Hole pair. So it will be to produce light, electronic & ndash; Hole to form into electricity. As the global energy increasingly nervous, solar energy as a new type of energy is used in a variety of different fields.