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