{HEAD ~ The invention} relates to {TAIL ~ a system} and method for detecting 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 { TAIL ~ a system } and method for detecting 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 HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH