non-dispersive infrared (NDIR)

Non-dispersive infrared (NDIR) is a technique used to measure the concentration of gases, such as carbon dioxide, by detecting how they absorb specific infrared light wavelengths. The system passes infrared light through a sample gas; gases like CO2 absorb certain IR wavelengths, reducing the light reaching a detector. NDIR sensors use a special optical filter to isolate these wavelengths, making measurements highly selective and accurate. This method is widely used in environmental monitoring, HVAC systems, and industrial applications because of its reliability, sensitivity, and ability to measure gases directly without consuming them.