The working principle of carbon dioxide detector

The working principle of carbon dioxide detector

The working principle of the CO2 detector is mainly based on the infrared light source absorption principle. The following is the detailed working mechanism:

Infrared absorption principle: Carbon dioxide detectors detect carbon dioxide gas in the environment through the absorption properties of infrared light sources. Specifically, carbon dioxide molecules have absorption properties for infrared light of specific wavelengths, especially infrared light with a wavelength of approximately 4.26 microns (4260 nanometre).

Measuring chamber and light source: The gas to be measured is introduced into a measuring chamber with an infrared light source mounted at one end of the chamber and a filter and detector at the other end. The filter allows infrared light of a specific wavelength to pass through, while the detector measures the luminous flux through the chamber.

Detector Measurement: The amount of light flux received by the detector depends on the concentration of carbon dioxide in the environment. When the carbon dioxide concentration increases, more infrared light is absorbed, resulting in a decrease in the luminous flux received by the detector. Conversely, when the carbon dioxide concentration decreases, the luminous flux received by the detector increases.

Dual-beam, dual-wavelength technology: In order to improve the accuracy and stability of measurements, some advanced carbon dioxide detectors utilize dual-beam, dual-wavelength infrared-based detectors. This technology allows the comparison of two different wavelengths of infrared absorption at the same time, thus eliminating the effect of environmental changes on the measurement results.

Flush Mounting and Maintenance: CO2 detectors are usually mounted in a flush mounting method, where the measurement probes do not wear out and therefore do not require frequent maintenance. In addition, they have long calibration intervals, high measurement accuracy, and stable and reliable data.

Through the above principles, CO2 detectors are able to accurately measure the CO2 concentration in the environment and trigger an alarm or activate the ventilation system when the concentration exceeds the safe range to ensure air quality and personnel safety.



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