How does it work?

( debar - Lord High Expositioner, Tue 24 May 2005, 16:38, archived)

It uses changes
in the Raman-Scattering response (Stokes and Anti-Stokes lines) in a standard telecoms-type fibre to give a temperature profile of the whole fibre's length.
( L-Space - scientia sapientes vocat., Tue 24 May 2005, 16:52, archived)