This chapter will concentrate on measuring devices utilizing the principle of the absorption of infra-red radiation by gaseous species and their subsequent use in industrial air pollution monitoring. This method — particularly the use of non-dispersive infra-red (NDIR) measurements — provides the most robust technique for the continuous monitoring of polluting gases, combining accuracy of result, together with long life of analysers and relatively low maintenance costs.
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- Optical methods of analysis. 1 Infra-red
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