Patent ID: 8290315
Filing Date: 2012-10-16
Classification: G01D,G01K,Y10T

Abstract:
1. An apparatus comprising an optical fibre and a strain isolating housing wherein the housing defines a cavity and defines an entry to the cavity and an exit from the cavity, the optical fibre being arranged to enter the housing at the entry and to exit the housing at the exit and being secured to the housing at a first securing location in the region of said entry and at a second securing location in the region of said exit, the optical fibre including a Bragg grating within the housing and extending between the entry and the exit along a non-intersecting path that has at least one unsecured arcuate portion such that the portion at which the Bragg grating is formed is substantially isolated within the housing from strain imposed on the fibre outside the housing and such that substantially only changes in temperature affect the Bragg grating and the apparatus further comprises a processor arranged to receive a signal influenced by the Bragg Grating on the optical fibre and to use a change in the signal as an indication of a change in temperature.