The gas sensor refers to the physical or chemical change caused by the physical or chemical reaction. Between the gas molecules to be detected and the gas-sensitive material.
Transform into electrical signals, optical signals, acoustic signals, etc. that can be effectively measured. So as to realize a kind of sensor for measuring gas type and concentration.
According to the working principle. Gas sensors can be divided into electrical gas sensors for direct measurement and optical gas sensors for indirect measurement.
Electrical gas sensors include semiconductor type, electrochemical type, catalytic combustion type, quartz microbalance type and surface acoustic wave type. The principle of each is different. For example, semiconductor-type gas sensors are mainly based on the reaction between semiconductor sensitive materials and gas. Leading to the gains and losses of the electrons of the sensitive materials. thereby changing the electrical properties of the gas-sensitive materials. Gas can be accurately detected by detecting changes in its electrical properties.
Indirect measurement type
Indirect measurement gas sensor. The most important infrared gas sensor. Is a gas sensing device that selects absorption characteristics based on the near-infrared spectrum of different gas molecules. It uses the relationship between gas concentration and absorption intensity to detect gas components and determine its concentration.
With the continuous development of science and technology. Gas sensors have been widely used in the fields of security and environmental monitoring. Gas sensors are widely used in production process monitoring. gas composition analysis and other fields, providing strong support for the development of various industries in our country and the Internet of Everything.
In the production and manufacturing fields such as the power industry, gas sensors are also commonly used to quantitatively measure the concentration of each component in the flue gas to determine the combustion situation and the emission of harmful gases. In the field of atmospheric environmental monitoring, it is very common to use gas sensors to determine environmental pollution.