Fibre Bragg gratings subject to high strain at high frequencies

D. A. Jackson

doi:10.1117/12.884982

17 May 2011 Fibre Bragg gratings subject to high strain at high frequencies

D. A. Jackson

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 775374 (2011) https://doi.org/10.1117/12.884982
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

A simple optical interrogation scheme based on an erbium doped fibre super-fluorescent source and a high Finesse Fabry Perot driven at effective frequencies of 20 kHz over ~ 60nm range is used to recover the output signals from Fibre Bragg Gratings (FBG) that can be deployed in a serial array. The FBG were modulated at frequencies up to 10 kHz and strains up to ~4000μstrain. These signals were recovered in the time domain with a very high bandwidth digital scope using a two dimensional waterfall display consisting of a number of segments where the time between segments is equal to the inverse of the system scanning frequency; essentially the sequential 'x' axis tick markers in a conventional x-y graph format. The amplitude induced changes in the wavelength of the FBG are converted to different times and observed as sequential horizontal scans along the time axis of the waterfall, correspond to the variations in the wavelength of the FBG (y axis). Signals from serial FBG arrays appear at different time slices on the time axis enabling near simultaneous determination of the induced strain of each grating.

Citation Download Citation

D. A. Jackson "Fibre Bragg gratings subject to high strain at high frequencies", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 775374 (17 May 2011); https://doi.org/10.1117/12.884982

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