Gas sensor Principle and purpose

Gas sensor , is the use of a variety of chemical , physical effects of the gas composition, the concentration of certain laws into electrical output of the device. With the development of society and the advancement of science and technology , research and development of gas sensors has drawn increasing attention, various gas sensors emerged. Integrated gas sensor applications , mainly the following purposes Toxic and combustible gas detectioToxic and combustible gas detection is the largest market for gas sensors . Mainly used in petroleum , mining, semiconductor industry and mining enterprises and in the family environment, detection and control. In the petroleum, petrochemical, mining industry, hydrogen sulfide , carbon monoxide, chlorine , methane and hydrocarbons are the main detection of combustible gases. The most important in the semiconductor industry is the detection of phosphorus , arsenic, and silanes. Families mainly gas and LPG leak detector and whether ventilationCombustion control The automotive industry is another important market for gas sensors . Oxygen sensor used to detect and control the engine air-fuel ratio , the combustion process optimization. In large industrial boilers with a combustion process using gas sensor controls to improve combustion efficiency to reduce exhaust emissions and save energy. Gas Engine Coolant Temperature Sensor can also be used to detect a car or emissions from the chimney . These emissions include carbon dioxide , sulfur dioxide and carbon monoxide. Food and beverage processingIn the food and beverage processing , sulfur dioxide Crankshaft Position Sensoris a very useful device . Sulphur dioxide used in many food and beverage preservation and testing, to contain specific taste and flavor to keep the minimum required concentration of sulfur dioxide . In addition , gas sensors are also used to detect wine, beer, wine fermented sorghum to ensure product uniformity and reduce costs.Medical diagnosis Patient status of available gas Crank Position Sensor diagnostic tests, such as bad breath test , carbon dioxide and oxygen concentration in the blood testing.Table 1 illustrates the major gas sensors detect gases and applications. A wide variety of gas sensors , space is limited, impossible to describe . This part describes the applications more widely , there are certain production capacity of domestic gas sensor , which is a semiconductor gas sensors, electrochemical gas sensors, gas sensors and contactless thermal conductivity gas sensor . For other gases in Optical sensors ,