8 September 2010 Dynamic studies of fibre Bragg gratings
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Proceedings Volume 7653, Fourth European Workshop on Optical Fibre Sensors; 76530T (2010) https://doi.org/10.1117/12.864115
Event: (EWOFS'10) Fourth European Workshop on Optical Fibre Sensors, 2010, Porto, Portugal
The dynamic performance of standard fibre Bragg gratings (FBGs) is assessed. The interrogating system used for all the reported measurements was an all fibre optic Mach Zehnder interferometer which generated a fade free optical carrier to enable heterodyne processing to be exploited. The carrier frequency was selected for specific experimental configurations used to test the FBG performance; the carrier frequencies were in the range 5 kHz to 2 MHz. To assess the minimum detectable low frequency dynamic strain the grating was fixed between two points and subjected to a displacement corresponding to 1g over a frequency range of 100Hz to 1 kHz. The Strain resolution throughout the frequency range was ≥ 10-2 με. Experiments were performed to measure the spectra of FBGs subject to high frequency strains where the FBG is wrapped under tension on a PZT and modulated at frequencies up to 100 kHz; the optical carrier frequencies used were 1 and 2 MHz. A new approach for measuring large strains at low frequencies and high resolution is demonstrated by comparing the relative phase of a FBG subject to increasing strain to a reference FBG held under constant environmental conditions; resolutions of ~0.5 με were achieved.
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D. A. Jackson, D. A. Jackson, "Dynamic studies of fibre Bragg gratings", Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 76530T (8 September 2010); doi: 10.1117/12.864115; https://doi.org/10.1117/12.864115

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