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The development history of carbon dioxide sensors
As we all know, carbon dioxide, as one of the main gases, has an important impact on agriculture, industry and other fields. With the continuous progress of modern society, the content of carbon dioxide has gradually increased. Studies have shown that the earth’s greenhouse effect has evolved from the industrial revolution. It began to take shape, and now it is becoming more and more intense. Currently, carbon dioxide emissions from human activities have reached historical peaks. The latest data show that global carbon dioxide emissions in 2011 were 163 times that of 1850. In 1850, the United Kingdom was the world's largest emitter of carbon dioxide, and its emissions were almost six times that of the United States, the second largest emitter. In addition, the top five emitters include France, Germany and Belgium. In 2011, China became the world's largest emitter, followed by the United States, India, Russia and Japan. In order to solve the environmental pollution caused by carbon dioxide, it is necessary to develop a carbon dioxide sensor. The carbon dioxide sensor mainly detects the carbon dioxide component in the atmospheric environment. The research on absorption gas sensor technology in foreign developed countries started relatively early: the earliest research on gas concentration measurement using spectral absorption fiber optic sensing technology was H. inaba and K. Chan of Tohoku University in Japan. Some basic researches on gas sensing have been done in the range of the optical fiber transmission window. In 1979, they proposed the use of long-distance optical fiber for air pollution detection. In 1983, they used LED as a broadband light source with a narrow-band interference filter to detect the spectrum of methane around 1331. 2nm. The length of the gas chamber in the system is 0.5m, the transmission fiber is a 10-km long multimode fiber, and the receiving device uses a germanium detector cooled by a mixture of ice and methanol. The minimum detection sensitivity of the system is 25% LEL (lower limit of gas explosion). Thereafter, in 1985, H. Inaba and K. Chan and H． Ito et al. used InGaAs LED as the light source to align the harmonic absorption peak of methane at 1665.4 nm, and the minimum detection sensitivity of the system was doubled. The research of infrared absorption carbon dioxide gas sensors in China started late. At present, the sensors produced and used in China are mainly solid electrolyte type, barium titanate composite oxide capacitive type, conductance change type rear membrane type, etc. There are many shortcomings: poor gas selectivity, prone to false alarms, frequent calibration of the system, short service life and other shortcomings. It was not until 2005 that my country's non-dispersive infrared (NDIR) gas sensor technology research made new progress, but its key components still need to be imported. Infrared gas detection technology has obvious advantages in all directions in my country whether it is using new technologies to transform traditional industries or replacing imports. It has a wide range of applications and has obvious economic and social benefits. There are many methods for detecting carbon dioxide at present, mainly including gas chromatography, titration, solid electrolyte, capacitive, optical fiber detection, infrared absorption and other methods. RS-CO2*-*-2 carbon dioxide sensor is mainly used to detect the concentration of carbon dioxide in the air. It adopts imported GE sensor and new infrared verification technology. It has rapid and sensitive response and avoids the life and long-term drift of traditional electrochemical sensors. Problem. Its monitoring range is between 400-5000ppm, comes with temperature compensation, is less affected by temperature, and the shell is a wall-mounted king-shaped shell, which is fixed on the wall with two screws, which is very convenient to install . Currently, the carbon dioxide sensors developed and produced according to the output type are 485 type, analog quantity type and 433 wireless type. According to the monitoring elements, there are two types of single carbon dioxide sensor and carbon dioxide temperature and humidity sensor. ~30V DC power supply, high enclosure protection level, can adapt to various harsh conditions on site, and can also be widely used in agricultural greenhouses, flower cultivation, edible fungus cultivation and other places that require CO2 monitoring.
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