A new sensing technique for the distributed measurement of temperature and strain, based on Brillouin optical frequency-domain analysis, is presented. Theoretical investigations and first experimental results of distributed measurements demonstrate the feasibility of this new concept.
Stimulated Brillouin scattering (SBS) is the dominant non-linearity in silica optical fibres. In highfinesse all-fibre ring resonators with fibre lengths of the order of 10 m stimulated Brillouin scattering can be observed at input power levels in the range of 10 to 100 μW [1]. Above pump threshold fibre optic ring resonators show intensive laser oscillation at the Stokes wavelength and therefore are called Brillouin ring lasers (BRL). An important application of Brillouin ring lasers is the all-fibre optic ring laser gyro [2].
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