Temperature sensor refers to a sensor that can sense temperature and convert it into a usable output signal. Temperature sensor is the core part of temperature measuring instrument, and there are many varieties. According to the measurement method can be divided into contact and non-contact two categories, according to the sensor material and electronic component characteristics are divided into thermal resistance and thermocouple two categories.
Application field
Temperature is a physical quantity that characterizes the degree of cold and heat of an object. It is a very important and common measurement parameter in the process of industrial and agricultural production. The measurement and control of temperature play a very important role in ensuring product quality, improving production efficiency, saving energy, production safety and promoting the development of national economy. Due to the universality of temperature measurement, the number of temperature sensors ranks first among various sensors, accounting for about 50%.
Temperature sensors measure indirectly by changing a property of an object as it changes temperature. The characteristics of many materials and components change with the change of temperature, so there are quite a lot of materials that can be used as temperature sensors. Temperature sensor with the temperature caused by changes in physical parameters are: expansion, resistance, capacitance, and electromotive force, magnetic properties, frequency, optical characteristics and thermal noise and so on. With the development of production, new temperature sensors will continue to emerge.
Due to the extremely wide range of temperature measurement in industrial and agricultural production, from several hundred degrees below zero to several thousand degrees above zero, and temperature sensors made of various materials can only be used in a certain temperature range.
The contact mode between 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 so that the two carry out sufficient heat exchange and reach the same temperature. This kind of sensor mainly has resistance type, thermocouple, PN junction temperature sensor and so on. The non-contact temperature sensor does not need to contact with the measured medium, but passes the heat radiation or convection of the measured medium to the temperature sensor to achieve the purpose of temperature measurement. This kind of sensor mainly has infrared temperature sensor. The main feature of this temperature measurement method is that it can measure the temperature of substances in motion (such as the temperature of the bearing of a slow moving train, the temperature of a rotating cement kiln) and objects with a small heat capacity (such as the temperature distribution in an integrated circuit).
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Post time: Sep-15-2023