Multi-hydrogenated compounds monitoring in optical fibre manufacturing process by photoacoustic spectroscopy |
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| Authors: | J.-P. Besson S. Schilt F. Sauser E. Rochat P. Hamel F. Sandoz M. Niklès L. Thévenaz |
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| Affiliation: | (1) Nanophotonics and Metrology Laboratory, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland;(2) Omnisens SA, Riond-Bosson 3, 1110 Morges, Switzerland;(3) Daetwyler Fiber Optics SA, Route de la Gare 70, 2017 Boudry, Switzerland |
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| Abstract: | Sub-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. PACS 42.62.Fi; 43.35.Ud |
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