Ratiometric interrogation of dynamically strained fiber Bragg gratings

R. R J Maier, James S. Barton, Mathias Kuhn

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 µe at 23 kHz is demonstrated and the noise for strain e(=?L/L) is 5·10-9 evHz-1.

Original languageEnglish
Title of host publication19th International Conference on Optical Fibre Sensors
Volume7004
DOIs
Publication statusPublished - 2008
Event19th International Conference on Optical Fibre Sensors - Perth, WA, Australia
Duration: 15 Apr 200818 Apr 2008

Conference

Conference19th International Conference on Optical Fibre Sensors
CountryAustralia
CityPerth, WA
Period15/04/0818/04/08

Keywords

  • Dynamic interrogation
  • Fiber Bragg grating
  • Ratiometric
  • Sensing

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