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NDIR is an industry term for “nondispersive infrared”, and is the most common type of sensor used to measure carbon dioxide, or CO2.
The CO2 sensor works by directing light waves from an infrared lamp through a tube filled with air samples. This air moves toward an optical filter in front of an IR light detector. The IR light detector measures the amount of IR light that passes through the optical filter.
The band of IR radiation also produced by the lamp is very close to the 4.26-micron absorption band of CO2. Because the IR spectrum of CO2 is unique, matching the light source wavelength serves as a signature or “fingerprint” to identify the CO2 molecule. As the IR light passes through the length of the tube, the CO2 gas molecules absorb the specific band of IR light while letting other wavelengths of light pass through. At the detector end, the remaining light hits an optical filter that absorbs every wavelength of light except the wavelength absorbed by CO2 molecules in the air sample tube.
Finally, an IR detector reads the remaining amount of light that was not absorbed by the CO2 molecules or the optical filter.
Article source: https://article-realm.com/article/Home-Family/Landscaping/40840-How-does-an-NDIR-CO2-Sensor-Work.html
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