How does the resistance thermometer work

How does the resistance thermometer work ?


Thermal resistance is a new type of semiconductor temperature sensing element developed in recent

 years.Because of its high sensitivity, small size, light weight, low thermal inertia, long life and low price,

 it is widely used. A negative coefficient thermistor thermistor is different from a normal RTD in that it has

 a negative resistance temperature characteristic, and when the temperature rises, the resistance value 

decreases.


The resistance value of the thermistor---the temperature characteristic curve is an exponential curve with a 

large nonlinearity. Therefore, linearization is required in use. Although the linearization process can improve 

the characteristic curve of the thermistor, it is complicated. The application of the thermistor is to sense the

 temperature for a constant current to the thermistor, to obtain a voltage across the measured resistance, and

 then to find the temperature. If the voltage across the thermistor can be measured and the parameters and the

 factor K are known, the ambient temperature of the thermistor, that is, the measured temperature, can be calculated.

 This converts the relationship of resistance with temperature into the relationship between voltage and temperature

 changes. The resistance thermometer converts the voltage value across the thermistor into a digital quantity through

 A/D conversion, and then calculates the temperature value by software method, and then displays it through the

 LCD screen

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