What is the use of temperature sensors?

1, temperature is a physical quantity that represents the degree of heat and heat, Is a very important and general measurement parameter in the process of industrial and agricultural production, Temperature measurement and control plays a very important role in ensuring product quality, improving production efficiency, saving energy, production safety, and promoting the development of national economy. 

2. Temperature sensor is indirectly measured by changing some characteristics of the object with the change of temperature, The properties of many materials and components change with the temperature, So there are quite a lot of materials that can be used as temperature sensors, Temperature sensor with temperature changes: expansion, resistance, capacitance, and electromomentum, magnetic performance, frequency, optical characteristics and thermal noise, etc., With the development of the production, New temperature sensors will continue to emerge; 

3. Due to the extremely wide range of temperature measurement in industrial and agricultural production, From hundreds below zero to thousands of degrees above zero, And the temperature sensors made of various materials can only be used in a certain temperature range;

 4. The contact mode of the temperature sensor and the measured medium is divided into two categories: contact and non-contact, The contact temperature sensor needs to maintain thermal contact with the measured medium, To achieve sufficient heat exchange to reach the same temperature, This kind of sensors mainly have resistance type, thermocouple, PN junction temperature sensor, etc., Non-contact temperature sensors are not required withTest medium contact, but through the thermal radiation or spread to the temperature sensor, in order to achieve the purpose of temperature measurement, this kind of sensor mainly has infrared temperature sensor, the main characteristic of the temperature method is can measure the temperature of moving material (such as the slow exercise of the train bearing temperature, the rotation of the cement kiln temperature) and small heat capacity objects (such as the temperature distribution in the integrated circuit