Metal oxide semiconductor gas sensors in environmental monitoring
With the rapid development of industrialization and urbanization, environmental pollution has increasingly serious impacts on human health and ecosystems. In order to protect the environment and human health, metal oxide semiconductor gas sensors in environmental monitoring and control has become an important means. This article will introduce metal oxide semiconductor gas sensors in environmental monitoring, and its positive impact on health and sustainable development.
Working principle and characteristics of semiconductor gas sensor
A semiconductor gas sensor is a sensor that uses the characteristics of semiconductor materials to detect the gas concentration in the environment. Its working principle is based on the interaction between the surface of the semiconductor material and the target gas. When the target gas is in contact with the semiconductor surface, it will cause a change in resistivity, and by measuring the change in resistivity, the concentration of the target gas can be determined. Compared with other sensors, semiconductor gas sensors have the advantages of high sensitivity, fast response, and low cost.
Metal oxide semiconductor gas sensors in environmental monitoring
1.Air pollution monitoring: Semiconductor gas sensors can be widely used to monitor the concentration of various harmful gases in the air, such as sulfur dioxide, carbon monoxide, nitrogen oxides, etc. By installing sensors and building a monitoring network, we can understand the air pollution in the environment in real time, and formulate corresponding control measures through data analysis.
2.Water quality monitoring: Semiconductor gas sensors can also be used to detect harmful gases and dissolved oxygen concentrations in water bodies. In the field of water quality monitoring, the high sensitivity and fast response of semiconductor gas sensors can help us understand the pollution level of water bodies in time and ensure the safety and sustainable use of water resources.
3.Industrial waste gas emission control: In the process of industrial production, a large amount of waste gas will be produced, which contains many harmful substances. Semiconductor gas sensors can be installed at the exhaust outlets of factories to monitor the concentration of harmful gases in the exhaust gas in real time, helping enterprises control pollutant emissions and reduce adverse effects on the environment.
Effects of Semiconductor Gas Sensors on Human Health
Tampering or modifying the signal that the oxygen sensor sends to the engine computer could be detrimental to emissions control and could even damage the vehicle. When the engine is under low load conditions, such as accelerating very slowly or maintaining a constant speed, it will run in “closed loop mode”. This refers to the feedback loop between the ECU and the oxygen sensor, where the ECU adjusts the fuel amount and expects to see the resulting change in the oxygen sensor’s response. This cycle forces the engine to run both slightly lean and slightly lean in successive cycles as it tries to maintain most of the stoichiometry on average. If the modification causes the engine to run moderately lean, there will be a slight increase in fuel efficiency, emissions, higher exhaust temperatures, sometimes a small increase in power can quickly lead to misfire and a sharp loss of power, and in ultra-lean air can damage the engine and catalysis Converter (due to misfire) – fuel ratio. If the modification causes the engine to become richer, the power will increase slightly up to a point (after which the engine will start flooding with too much unburned fuel), but at the cost of less fuel efficiency and more unburned hydrocarbons In the exhaust it can cause the catalytic converter to overheat. Running rich for extended periods of time can lead to catastrophic failure of the catalytic converter. The ECU also controls the timing of the spark engine. As the fuel injector pulse width increases, whenever the fuel ignites too early or too late in the combustion cycle, modifications to the operation of the engine to make it lean or too rich can cause Inefficient fuel consumption.
In conclusion
With the increasingly prominent problem of environmental pollution, Metal oxide semiconductor gas sensors in environmental monitoring and control has become an important means. Through real-time monitoring and data analysis, semiconductor gas sensors can help us better understand environmental pollution and take appropriate measures to protect the environment and human health. In the future, with the continuous development of science and technology, it is believed that semiconductor gas sensors will play a greater role in the field of environmental protection and contribute to the construction of a sustainable society.
