Accurate detection of gas plays an important role in modern war
aerospace
emergency rescue
etc.Non dispersive infrared(NDIR) sensors are a kind of tools for qualitative and quantitative detection of gas based on the infrared absorption at specific wavelength
which has the advantages of real time detection
wide detection range
low consumption and long lifetime.The principles
instrumental structures and related applications of NDIR sensors are reviewed in this paper
and an outlook for the future trend of NDIR sensors is provided.