NDIR

Non-Dispersive InfraRed (NDIR) is used for measuring the component concentrations of a sample gas.  This is achieved by measuring the infrared energy absorbed by the measured component continuously, which is related to the concentration.

The main components are an infrared source (lamp), a sample chamber, a wavelength filter, and the infrared detector. The gas is pumped into the sample chamber, and gas concentration is measured by its absorption of a specific wavelength in the infrared (IR). The IR light is directed through the sample chamber towards the detector. The detector has an optical filter in front of it that eliminates all light except the wavelength that the analyte gas molecules can absorb.  Ideally other gas molecules do not absorb light at this wavelength, and do not affect the amount of light reaching the detector.

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