The invention relates to a system and {HEAD ~ method} for detecting one or more gases or gas mixtures and for measuring {TAIL ~ 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 
for measuring
The invention relates to a system and { HEAD ~ method } for detecting one or more gases or gas mixtures and for measuring { TAIL ~ 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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