How co2 sensor works?
Introduction:
A carbon dioxide sensor is an electronic device used to detect the concentration of carbon dioxide in the environment. It is widely used in indoor air quality monitoring, industrial production process control, greenhouse gas emission monitoring and other fields. This article will introduce in detail How co2 sensor works.
Physical properties of carbon dioxide
Before introducing How co2 sensor works, we need to understand the physical characteristics of carbon dioxide. Carbon dioxide is a colorless, odorless, nonflammable gas with the molecular formula CO2. It is about 1.5 times denser than air and is in solid or liquid form at normal temperature, but it is a common gaseous substance at standard atmospheric pressure.
Carbon Dioxide Sensor Classification
According to its principle and application scenarios, the common carbon dioxide sensors on the market can be divided into the following categories:
1.Infrared gas sensor: use infrared absorption characteristics to detect CO2 concentration
2.Electrochemical gas sensor: use CO2 and electrode to detect CO2 concentration
3.Optical sensor: use optical absorption characteristics to detect CO2 concentration
How infrared absorption sensors work
Infrared sensors are currently one of the most widely used carbon dioxide sensors. Its working principle is based on the absorption properties of carbon dioxide on infrared rays. When infrared rays pass through the air containing CO2, part of the spectrum is absorbed, and the rest of the spectrum passes through the air to the detector. The detector measures the intensity of the transmitted spectrum and compares it with the reference spectrum without CO2 absorption to calculate The concentration of CO2 in the environment.
How electrochemical sensors work
Electrochemical sensors are another common carbon dioxide sensor. Its working principle is based on the reaction of CO2 with the electrode surface. When CO2 comes into contact with the electrode surface, a chemical reaction occurs that causes a change in electrical potential across the electrode. By measuring this change, the concentration of CO2 in the environment can be calculated
How Optical Sensors Work
The optical sensor is a new type of carbon dioxide sensor, which uses the spectral absorption characteristics of CO2 to a specific wavelength to detect the concentration of CO2. Part of the spectrum is absorbed when infrared rays pass through air containing CO2, and the degree of absorption is proportional to the concentration of CO2. By measuring the change in the remaining light intensity after passing through the sample, the concentration of CO2 in the environment can be calculated
Summarize
A carbon dioxide sensor is an electronic device used to detect the concentration of CO2 in the environment. At present, the common carbon dioxide sensors on the market can be divided into three types: infrared absorption type, electrochemical type and optical type. Among them, the infrared absorption sensor is the most widely used one. No matter what principle is adopted, the carbon dioxide sensor needs specific components to realize the detection and calculation of CO2 concentration.
