Is industrial thermistor the principle for measuring temperature changes?

In the development of the industrial wave, the use of thermal resistance and thermocouple inspection instruments has changed people's level of temperature control. Through the use of such instruments, the entire process of industrial production can be monitored and controlled comprehensively. People are not very familiar with the inspection principles of thermistors and thermocouples. In fact, there are some differences in the basic measurement principles of thermistors and thermocouples, and they also have certain similarities and commonalities. Thermistor is mainly based on the principle of thermal effect of resistance to induce temperature measurement. Its specific explanation is that the resistance value of the resistor body changes with temperature. Therefore, as long as there is a temperature fluctuation, even a small one, the thermal resistance can sense it and accurately measure the temperature to meet the design requirements. At present, based on the different types of thermal resistance wires, they are mainly divided into two categories: metal thermal resistance and semiconductor thermal resistance.

The resistance value and temperature of precious metal thermistors can usually be approximated by the following equation:
Rt=Rt0[1+α(t-t0)]
In the formula, Rt is the resistance value at temperature t; Rt0 is the corresponding resistance value at temperature t0 (usually t0=0 ℃); α is the temperature coefficient.
The relationship between the resistance value and temperature of a semiconductor thermistor is
Rt=AeB/t
In the formula, Rt is the resistance value at temperature t; A. B depends on the constant of the construction of semiconductor data.
After comparing the two, the temperature coefficient of thermistor is larger, and the resistance value at room temperature is higher (usually above several thousand ohms), but the interchangeability is poor, the nonlinearity is severe, and the temperature measurement range is only about -50~300 ℃. It is widely used for temperature inspection and control in household appliances and cars. Metal thermistors are usually suitable for temperature measurement in the range of -200~500 ℃. Their characteristics include measurement accuracy, good stability, and reliable functionality. They are widely used in process control.
From the perspective of the change in resistance with temperature, most metal conductors in industry have this property, but not all can be used as thermometers. Metal materials used as thermometers usually require: a temperature coefficient that is as large and stable as possible, a high resistivity (reducing the size of the sensor at the same sensitivity), stable chemical and physical functions within the temperature range of application, good reproducibility of data, and a proportional relationship between resistance values and temperature changes.