Recent progress towards centimetric spatial resolution in distributed fibre sensing
Optical fibre sensors based on stimulated Brillouin scattering have now clearly demonstrated their excellent capability for long-range distributed strain and temperature measurements. The fibre is used as sensing element and a value for temperature and/or strain can be obtained from any point along the fibre. While classical configurations have practically a spatial resolution limited by the phonon lifetime to 1 meter, novel approaches have been demonstrated these past years that can overcome this limit. This can be achieved either by the prior activation of the acoustic wave by a long lasting pre-pumping signal, leading to the optimized configuration using Brillouin echoes, or by probing a classically generated steady acoustic wave using a ultra-short pulse propagating in the orthogonal polarization of a highly birefringent fibre. These novel configurations can offer spatial resolutions in the centimetre range, while preserving the full accuracy on the determination of temperature and strain.
Keywords: Fibre optics ; optical fibre sensor ; distributed fibre sensor ; stimulated Brillouin scattering ; nonlinear optics ; Stimulated Brillouin-Scattering ; Polarization-Maintaining Fiber ; Dynamic Grating Spectrum ; Optical-Fiber ; Continuous-Wave ; Gain ; Sensor ; Pulse ; Time ; Strain
Record created on 2011-01-10, modified on 2016-08-09