With the rapid development of China's economy, air pollution, industrial digital transformation, Internet of Things, artificial intelligence and other fields have gradually begun to apply gas sensors to improve industrial efficiency, ensure safe production and achieve high-quality development. At the same time, with the guidance and support of national policies, the market scale of gas sensors is constantly expanding, and a new round of demand growth has begun.
Gas sensor is a transducer which displays the changes produced by chemical and physical reactions in the form of optical signals and acoustic signals. The detector regulates the gas sample through the gas sensor, which usually includes filtering out impurities and interfering gases, drying or refrigerating the display part of the instrument, so as to realize the measurement of the corresponding object types and concentrations. Gas sensor is the core of gas monitoring system and plays a decisive role in gas detection system. According to GMI report, by 2026, the shipment of gas sensors will reach 80 million, the market valuation will exceed 2 billion US dollars, and the compound growth rate will remain at about 7%.
According to the difference of technical principles, gas sensors are mainly divided into the following types, which are semiconductor gas sensors, infrared gas sensors, catalytic combustion gas sensors, electrochemical gas sensors, photoelectric ion detection gas sensors and so on.
- Semiconductor gas sensor
Semiconductor gas sensor is an impedance device mainly supported by metal oxide film, and its resistance varies with gas content; Low cost, easy to manufacture, wide application, but easy to be disturbed, poor selectivity to gas, poor stability and high powerful consumption; It is mainly used in household, factory and commercial combustible gas detection, fire safety detection, air quality detection of household appliances and automobiles.
- Infrared gas sensor
Infrared gas sensor detects gas concentration by detecting the absorption rate of different gas components to different wavelengths; Good selectivity, strong ability to resist cross-interference, no need to work in the environment of central enterprises, long service life, but technical difficulty and high cost; Infrared gas sensor is an important carrier of intelligent gas sensor, which is mainly used in HVAC, indoor air quality monitoring, industrial process and safety prevention and control monitoring.
- Catalytic combustion gas sensor
When the detection element comes into contact with combustible gas, oxidation combustion occurs, the heating wire heats up, and the resistance value changes, so as to calculate the gas concentration; Most combustible gases can be detected, but oxygen is needed for measurement, and the progress is low; It is mostly used to detect the concentration of combustible gases such as natural gas, liquefied gas, coal gas and alkanes.
- Electrochemical gas sensor
It is divided into four types: primary cell type, controllable potential electrolysis type, electric quantity type and ion electrode type, and gas measurement is carried out by oxidation-reduction principle; Small size, low power consumption, wide linear range and good repeatability, but it is disturbed and short life; It can be used to detect toxic gases, oxygen and alcohol.
- Photoelectric ion gas sensor
It consists of an ultraviolet light source and a gas chamber. After the gas reaches the gas chamber, it is ionized under the irradiation of an ultraviolet lamp to form a current, and the gas concentration is obtained by measuring the current; It has high sensitivity to volatile organic compounds, but it has high cost, short service life and is easily affected by high temperature environment; Mainly used in VOC detection and analysis instruments, widely used in chemical, petroleum, environmental protection, pharmaceutical and other industries.
Generally speaking, gas sensors are used to measure and evaluate the concentration of certain gases or organic volatiles in the environment, which helps safety monitoring. At present, gas sensors have changed from traditional products to intelligent products, represented by electronic nose, which can monitor complex odors, effectively process multi-dimensional information, expand the application scenarios of sensors and enhance the recognition ability of sensors.
Gas sensor chip
At present, the main advantages of gas sensors are strong stability, high sensitivity, long service life, small size and excellent performance. They can be widely used in gas identification and analysis, gas leakage monitoring, odor collection, safety production monitoring and other fields, helping automatic production to improve efficiency and reduce production costs. As the key technology of Internet of Things application, sensor is one of the core foundations of building Internet of Things, which will be the fulcrum of sustainable development of intelligent enterprises and the next emerging market.
Source: Puhua Youce
As the core component of monitoring equipment, gas sensor can be widely used in smart home, medical and health care, wearable devices, petrochemical industry, environmental protection and other industries, covering a wide range of industries, showing vigorous development prospects. In addition, as a sensor simulating smell, it can assist related enterprises to improve the level of odor data collection, processing and processing, improve the monitoring ability of odor leakage, eliminate potential hidden dangers, effectively realize the intelligent and digital development of safety supervision, enhance the management and control ability of safety production, and help more enterprises to upgrade and empower scientifically.
Gas sensors are about to usher in a new round of demand growth-China exportsemi.com
