Besson, J. P.Schilt, S.Sauser, F.Rochat, E.Hamel, P.Sandoz, F.Nikles, M.Thévenaz, Luc2008-09-292008-09-292008-09-29200610.1007/s00340-006-2361-4https://infoscience.epfl.ch/handle/20.500.14299/29899WOS:0002407249000269377Sub-ppm hydrogen chloride (HCl) and water vapour (H2O) monitoring using photoacoustic spectroscopy in optical fibre manufacturing is reported. The development and performance of a sensor based on an acoustic resonant configuration is described, and on-site measurements are presented. Two DFB lasers emitting in the 1370 nm and 1740 nm range were used for the detection of H2O and HCl, respectively. A detection limit (defined for a SNR=3) of 60 ppb for HCl and 40 ppb for H2O was achieved. Contamination sources of the carrier gas used for the fibre preform manufacturing are identified and discussed. © Springer-Verlag 2006.Optical fibersHydrogenationPhotoacoustic spectroscopySemiconductor lasersContaminationChemical sensorsProcess controltext::journal::journal article::research article