Gas detection
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Non Dispersive InfraRed sensors function by monitoring the absorption of infrared radiation in the wavelength range affected by target gases, typically in the 3-5 micron wavelength range. Aliphatic hydrocarbons absorb in this region due to the fundamental C-H bond stretches and carbon dioxide absorbs in this region due to the fundamental asymmetric O=C=O stretch.
IET Guide 2026
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