Distributed temperature sensing using Brillouin scattering in optical fibers : principle and cryogenic applications

by A. FELLAY (AT-MAS and EPFL Lausanne)

Thursday 20 Feb 2003, 14:15 → 15:15 Europe/Zurich

AT Auditorium (CERN)

When the temperature of large structures has to be monitored, distributed sensing schemes may become a conceptually and financially attractive alternative to customary point sensors. In the last ten years, measuring setups based on stimulated Brillouin scattering in optical fibers emerged as the most promising candidates and many tests were carried out at ambient temperature, in various laboratories as well as in the field. The extension of the useful temperature range of these devices towards low or very low temperatures has been recently studied as a side project in the AT-MAS group. After a short presentation of the technique, including the physics involved, we will report on the results of our measurements on LHC dipoles and discuss the advantages and drawbacks of this unconventional method.