Abstract
A new technique for the monitoring and multiplexing of fiber-Bragg-grating (FBG) sensors is described. The sensing elements - low-finesse Fabry-Perot interferometers formed with FBG pairs - are reflectively monitored with a linearly chirped Er:fiber laser. This reflected signal is convolved with a reference waveform which varies at a frequency proportional to the optical length of each sensor to 1) obtain a coarse measurement of FBG reflectance peak frequency and 2) refine this measurement using the phase of the convolved signal. Multiplexed sensors of different lengths are distinguished even though the reflectance spectra for the sensors may overlap or even coincide. A spectral resolution of 0.045 GHz (0.36 pm), corresponding to a temperature resolution of 0.035/spl deg/C, was achieved.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
