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Proceedings Paper

Ratiometric interrogation of dynamically strained fiber Bragg gratings
Author(s): Robert R. J. Maier; James S. Barton; Mathias Kuhn
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Paper 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.

Paper Details

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70040A (16 May 2008); doi: 10.1117/12.785595
Show Author Affiliations
Robert R. J. Maier, Heriot-Watt Univ. (United Kingdom)
James S. Barton, Heriot-Watt Univ. (United Kingdom)
Mathias Kuhn, Heriot-Watt Univ. (United Kingdom)
Univ. Würzburg (Germany)


Published in SPIE Proceedings Vol. 7004:
19th International Conference on Optical Fibre Sensors

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