Application Note NDIR-Measurement
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چکیده
The NDIR gas detection method is based on the absorption of infrared radiation, which is shown by many polyatomic or heterodimer diatomic gases. For example CO2 gas absorbs IR radiation at 4.26μm wavelength. The detected radiation intensity at this wavelength decreases if the concentration of CO2 increases between source and detector. The extent of absorption mainly depends on the absolute number of CO2-molecules between radiation source and detector. Accordingly, the given concentration for a measured intensity is a function of the cell length and the gas density.
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