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