Patent ID: 6878926
Filing Date: 2005-04-12
Classification: G01D,G01L

Abstract:
1. System for measuring at least one parameter, the system comprising: at least one optical sensor, each optical sensor comprising two Bragg gratings, the two Bragg gratings having respective sensitivities adjusted so that respective spectra of the two Bragg gratings have a relative spectral shift that depends on the at least one parameter to be measured, the two Bragg gratings being respectively provided in two optical waveguides; an optical source configured to supply light to the two optical waveguides to interrogate the two optical waveguides; means enabling the light to pass successively through the two Bragg gratings of a same optical sensor; photodetectors configured to measure a power level of light having passed only through one of the two optical waveguides and to measure a power level of light having passed successively through the two optical waveguides; and means for processing the power levels and supplying values of the at least one parameter measured.