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　　A thermistor is a type of thermoelectric resistor, and the principle of thermistors is that temperature causes a change in resistance. However, nowadays thermoelectric resistors are generally industrialized, mainly referring to commonly used thermistors such as PT100 and CU50. The difference between thermistors and thermistors is that generally, thermistors refer to metal thermistors (PT100), while thermistors refer to semiconductor thermistors. Due to the temperature coefficient of semiconductor thermistors being more than 10-100 times larger than that of metals, they can detect temperature changes of 10-6 ℃, and the resistance value can be arbitrarily selected between 0.1 and 100k Ω. So it is called a thermistor. The curve of the resistance value of a thermistor with temperature changes is non-linear, and the linearity of each same model is also different, and the temperature measurement range is relatively small. So in industry, metal thermistors are generally used, which is what we commonly refer to as thermistors.

　　Thermistors are sensitive components that have been developed early, have a wide range of types, and are relatively mature. Thermistors are composed of semiconductor ceramic materials and utilize the principle of temperature induced resistance changes. If the concentration of electrons and holes is n and p, respectively, the mobility is μ N μ p. The conductivity of a semiconductor is: σ= Q (n μ N+p μ p) .

　　Because n, p μ N μ P is a function of temperature T, so conductivity is a function of temperature. Therefore, the temperature can be calculated by measuring conductivity, and a resistance temperature characteristic curve can be drawn. This is the working principle of semiconductor thermistors.

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