Working principle of thermistor temperature sensor

　　Thermal resistance is a sensor resistor, the resistance value of thermistor, which changes with the changes in temperature, which is different from the general fixed resistance. The resistance value of the metal increases with the increase of the planting, but the semiconductor is the opposite. Its resistance value has decreased sharply with the increase of temperature, and it presents non -linear. When the temperature changes are the same, the resistance value of the thermistor resistance is about 10 times the lead thermal resistance. Therefore, it can be said that thermistor is particularly sensitive to changes in temperature. This temperature characteristics of semiconductor. It is because the conductive method of semiconductor is carrier (electronics, cave) conductive. Because the number of carriers in semiconductors is much less than free electrons in metals, its resistance is very large. As the temperature rises, the number of carrier flows participating in semiconductors will increase, so the semiconductor conductivity increases, and its resistivity will decrease.

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