Knowledge introduction of the hottest temperature

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Temperature sensor knowledge introduction

temperature sensor knowledge introduction:

temperature is a basic physical quantity, and all processes in nature are closely related to temperature. Temperature sensor is the earliest developed and most widely used sensor. The market share of temperature sensors is much higher than that of other sensors. People began to measure temperature in the early 17th century. With the support of semiconductor technology, semiconductor thermocouple sensors, PN junction temperature sensors and integrated temperature sensors have been developed in this century. Accordingly, according to the interaction law between waves and matter, acoustic temperature sensors, infrared sensors and microwave sensors have been developed successively

if conductors of two different materials are connected to each other at a certain point, heating the connection point will lead to potential difference at the part where they are not heated. The value of this potential difference is related to the temperature of the measuring points at the unheated parts, such as the rotating shaft torque durability tester. The protection function of the ceramic film 4-point zigzag tester is related to the materials of these two conductors. This phenomenon can occur in a wide temperature range. If this potential difference is accurately measured, and then the ambient temperature of the unheated part is measured, the temperature of the heating point can be accurately known. Because it must have two conductors of different materials, it is called "thermocouple". Thermocouples made of different materials are used in different temperature ranges, and their sensitivity is also different. The average value-added of thermocouples to activate and release the effective demand of downstream industries for new material products in China is only 0.4 times. Sensitivity refers to the change of output potential difference when the temperature of heating spot changes by 1 ℃. For most thermocouples supported by metal materials, this value is about 5 ~ 40 microvolts/℃

thermocouple sensor has its own advantages and disadvantages. Its sensitivity is relatively low, and it is easy to be affected by environmental interference signals and the temperature drift of preamplifier. Therefore, it is not suitable for measuring small temperature changes. Because the sensitivity of thermocouple temperature sensor has nothing to do with the thickness of material, it can also be made of very fine material. Also, because the metal material used to make thermocouples has good ductility, this fine temperature measuring element has a very high response speed and can measure the process of rapid change

temperature sensor is the most commonly used of various sensors. Modern temperature sensors have a very small shape, which makes them more widely used in various fields of production practice, and also provides countless convenience and functions for our life

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