16 May 2008 Ratiometric interrogation of dynamically strained fiber Bragg gratings
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Proceedings Volume 7004, 19th International Conference on Optical Fibre Sensors; 70040A (2008); doi: 10.1117/12.785595
Event: 19th International Conference on Optical Fibre Sensors, 2008, Perth, WA, Australia
Abstract
We demonstrate a new and highly flexible technique for high speed dynamic interrogation of fiber Bragg gratings [FBG]. The technique is based on a ratiometric measurement employing a pulsed broad band light source, a single detector and 2 filter FBGs. The filter FBGs are mounted on a temperature controlled cantilever where the strain of the filter FBGs can be adjusted to requirement. The technique can be used on multiplexed FBGs and has been demonstrated here at a frequency of 20kHz although much higher frequencies are possible with a light source of higher power. Sub micro-strain resolution of 0.6 με at 23 kHz is demonstrated and the noise for strain ε(=ΔL/L) is 5•10-9ε√Hz-1.
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Robert R. J. Maier, James S. Barton, Mathias Kuhn, "Ratiometric interrogation of dynamically strained fiber Bragg gratings", Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70040A (16 May 2008); doi: 10.1117/12.785595; https://doi.org/10.1117/12.785595
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