SELF-REFERENCED OPTICAL FIBRE SENSOR WITH STIMULATED BRILLOUIN SCATTERING

摘要

The invention pertains to the field of optical fibre sensors. The sensor of the invention is used for measuring a physical value. The sensor comprises at least: a measuring optical fibre (10) including at least one Bragg grating (12); an optical means (20) arranged so as to inject into the fibre a first pump wave at a first optical frequency and a second so-called probe wave at a second optical frequency, the second optical frequency being different from the first optical frequency, the Bragg grating being adapted so as to reflect the first and second optical waves, the optical power of the first wave being sufficient for providing, after interaction with the second wave reflected by stimulated Brillouin scattering, a so-called Stokes wave having a frequency representative of the physical value to be measured; a means (40) for analysing the frequency difference between the two optical pump and Stokes waves. The sensor can particularly be used as a hydrophone.