bivariate optical sensor based on Brillouin effect.

摘要

bivariate optical sensor based on Brillouin effect.; Optical sensor for measuring temperature and strain in a structure, comprising: an optical fluente (1) configured to emit an optical pump signal; at least one optical transducer (6) comprising a first waveguide (14) and a second waveguide (15) connected in series, wherein the first waveguide (14) is configured to provide a spectral response at a frequency Brillouin and the second waveguide (15) is configured to provide a spectral response to another-frequency Brillouin; -a optical input / output (10) to allow passage of the pump optical signal to said optical transducer (6) and to allow passage of an optical signal from said counter-propagating optical transducer (6) to a coupler optical (7). The at least one optical transducer (6), the optical input / output (10) and the optical coupler (7) form a resonant ring cavity. When the pump optical signal is injected into the transducer (6), it is generated in each of the waveguides (14, 15) having a Brillouin causing an optical signal centered at a respective Brillouin frequency. The optical coupler (7) is able to reinject into the optical cavity ring optical signals centered at these frequencies Brillouin. The measurement of these two frequencies ( nu {B1}, nu {B2}) discriminates the elongation and temperature of the structure.