NDIR CO2 sensor applications


Infrared carbon dioxide sensor is a kind of sensor made of NDIR non-dispersive infrared principle, with good selectivity, long life, independent of oxygen, little environmental interference, not easy to poison, high precision and various advantages, is widely recognized in the market for carbon dioxide monitoring applications.

Working principle

Due to the different internal structures of various substances, their selection of absorption of different wavelengths of light is also different, that is, substances can only absorb specific wavelengths of light, and the absorption relationship of substances to a certain wavelength of light follows the Lambert-Beer absorption law.


For the infrared carbon dioxide sensor, the infrared light source emits 1-20μm infrared light, which is absorbed by a certain length of the gas chamber, and then passes through a narrow band filter with a wavelength of 4.26μm, and the intensity of the infrared light through 4.26μm wavelength is monitored by the infrared detector, which represents the concentration of CO2 gas.

Application scenario

With the wide application of carbon dioxide gas in all walks of life, the control of carbon dioxide content is becoming more and more strict, and carbon dioxide sensors play an important role in various fields such as smart home, smart agriculture, industrial gas emissions, and automobile air conditioning systems.

1. Smart home

Carbon dioxide sensors can be integrated into smart home devices such as fresh air conditioners, fresh air systems, and air boxes to improve indoor air quality and create a good living environment for us.

2. Smart agriculture

In modern agriculture, the real-time monitoring and automatic regulation of carbon dioxide concentration has become a necessary technology for intelligent planting and breeding. Carbon dioxide sensors used in high temperature and high humidity environments such as agricultural greenhouses need to have the ability to resist high humidity interference, and dual-channel sensor products are generally selected.

3. Industrial gas emissions

As the level of industrialization increases, the emission of greenhouse gases also increases. In the context of carbon neutrality, the world is paying more attention to the emission of greenhouse gases such as carbon dioxide. The detection of carbon dioxide gas in the industrial field also requires the help of infrared carbon dioxide sensors.

4. Car air conditioning system

As the car gradually becomes the "third space" in life, people are increasingly concerned about the concentration of carbon dioxide and organic gas in the car. Carbon dioxide has not only become an important indicator to measure the air quality in the car, but also an important means to prevent fatigue driving, and the application of carbon dioxide sensors in automobile air conditioning systems is becoming more and more common.



The infrared carbon dioxide sensor is a precision electronic component, and the following matters should be noted during use:

1, the infrared sensor needs to be preheated before use. Preheating is a process to stabilize the optical system components inside the infrared sensor, which can enable the sensor to achieve better test performance.

2, in order to ensure that the sensor can work normally, the power supply voltage must be kept within the specified range, beyond which the sensor may fail, resulting in the sensor output concentration is low or cannot work normally.

3, the sensor should be away from the heat source, and avoid direct sunlight or other thermal radiation, do not use the sensor in the dust density environment for a long time.

4, if the sensor needs to be placed in a small space, this space should be well ventilated, especially the two diffusion Windows should be in a well-ventilated position

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