In {TAIL ~ addition}, {HEAD ~ the measuring chamber} is provided with a pressure sensor for detecting a photoacoustic signal generated in the measuring chamber 
In { TAIL ~ addition } , { HEAD ~ the measuring chamber } is provided with a pressure sensor for detecting a photoacoustic signal generated in the measuring chamber
REL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH