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Temperature Sensor Classification

Article source:admin Popularity:Published time:2019-05-09 18:54

Key word: Thermocouple sensor, thermistor sensor, analog temperature sensor, digital temperature sensor
1, thermocouple sensor
thermocouple sensor
A combination of two different conductors or semiconductors is called a thermocouple. The thermoelectric potential EAB(T, T0) is synthesized by the contact potential and the thermoelectric potential. Contact potential refers to the potential generated by two different conductors or semiconductors at the contact. This potential is related to the properties of the two conductors or semiconductors and the temperature at the point of contact. When two different conductors and semiconductors A and B form a circuit, they are connected to each other as long as the temperature at the two nodes is different. The temperature at one end is T, which is called the working end. The other end of the temperature is TO, called the free end. Then there is current in the loop, that is, the electromotive force existing in the loop is called the thermoelectromotive force, and the phenomenon that the electromotive force is generated due to the difference in temperature is called the Seebeck effect.

2, thermistor sensor
Thermistors are a class of sensitive components. The resistance value of the thermistor changes with temperature, which is different from the general fixed resistance and belongs to the class of variable resistors. Widely used in a variety of electronic components, unlike the resistance thermometer using pure metal. The material used in the thermistor is usually ceramic or polymer, and the positive temperature coefficient thermistor has a higher resistance value at higher temperatures. Negative temperature coefficient thermistors have lower resistance values at higher temperatures, and they belong to semiconductor devices. Thermistors typically achieve high accuracy over a limited temperature range, typically -90 ° C to 130 ° C.

thermistor sensor

3, analog temperature sensor
HTG3515CH is a voltage output type temperature sensor. Output current 1 ~ 3.6V, accuracy is ± 3% RH, 0 ~ 100% RH relative humidity range, operating temperature range -40 ~ 110 ° C, 5s response time, 0 ± 1% RH hysteresis. It is a module with integrated temperature and humidity output interface, designed for OEM customers where a reliable precision measurement is required, with a micro control chip; Humidity is a linear voltage output; With a 10Kohm NTC temperature output, the HTG3515CH can be used in high volume production and where high measurement accuracy is required.

analog temperature sensor

4, digital temperature sensor
It uses a silicon process to produce a digital temperature sensor that uses a PTAT structure. This semiconductor structure has accurate, temperature-dependent good output characteristics. The output of PTAT is modulated into a digital signal by a duty cycle comparator. The relationship between duty cycle and temperature is as follows:
C = 0.32 + 0.0047 * t, t is Celsius.

The output digital signal is compatible with the microprocessor mcu. The temperature of the output voltage square wave signal can be calculated by the high frequency sampling of the processor. This temperature sensor has a resolution better than 0.005K due to its special process. The temperature range of measurement is - 45 to 130 C, so it is widely used in high precision occasions.
digital temperature sensor


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