The invention relates to a system and {HEAD ~ method} for detecting one or more gases or {TAIL ~ gas mixtures} and for measuring the concentration of one or more gases or gas mixtures, said system comprising at least a light source, a sample space, a reference chamber, and a measuring chamber 
The invention relates to a system and { HEAD ~ method } for detecting one or more gases or { TAIL ~ gas mixtures } and for measuring the concentration of one or more gases or gas mixtures , said system comprising at least a light source , a sample space , a reference chamber , and a measuring chamber
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