An overview of thermistor

Thermistor is a development mature early, variety and development of a sensitive components, has high sensitivity, wide working range, good stability, etc. We are in for a thermistor has a detailed understanding, project today to introduce specific thermistor for you, hope you can help to you.

thermal resistor is composed of semiconductor ceramic materials, thermal resistor is to use semiconductor material, most of the negative temperature coefficient of resistance decreased with increasing temperature. Temperature changes can cause greater resistance to change, so it is the most sensitive temperature thermocouple sensor. But the poor linearity thermistor, and had a lot to do with production process. Manufacturers to a standardized thermistor curve. Thermistor volume is very small, respond to changes in temperature. But the thermistor need to use a current source, small size also makes it to the thermal error is very sensitive.

use of the principle is the resistance change with the temperature. If the concentration of electrons and holes respectively n, p, mobility of u n, u p, respectively, the conductivity of the semiconductor is:

sigma = q ( nμn + pμp)

because of n, p, u n, u p is a function of T depend on temperature, so the conductivity is a function of temperature, therefore can be calculated by measuring conductivity of high and low temperature, and can make the resistance - The temperature characteristic curve. This is the working principle of semiconductor thermistor.

thermistor including positive temperature coefficient ( PTC(列车自动控制系统) And the negative temperature coefficient ( NTC) Thermistor, and critical temperature thermistor ( CTR) 。

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure thermocouple sensor, digital temperature thermocouple sensor