Abstract
A passive, interferometric wavelength demodulation technique has been extended to measure the absolute wavelengths of a multiplexed array of fiber Bragg grating sensors. The scheme retains its original strain resolution of 10 nε/√{Hz}. A proof-of-concept interrogation system was able to determine the absolute wavelength of Bragg peaks to within 20 pm (17 με). Static and dynamic Bragg grating strains were accurately demodulated in both absolute and relative wavelength measurement modes. This demonstration indicates that interferometric techniques are able to provide absolute, static and dynamic measurements of strain within a single platform.
| Original language | English |
|---|---|
| Pages (from-to) | 2897-2903 |
| Number of pages | 8 |
| Journal | Journal of Lightwave Technology |
| Volume | 31 |
| Issue number | 17 |
| Early online date | 2 Aug 2013 |
| DOIs | |
| Publication status | Published - 13 Sep 2013 |
Keywords
- bragg grating
- calibrations
- fibre optic sensors
- light interferometry
- static strain measurement
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Perry, M., Orr, P., Niewczas, P., & Johnston, M. (2013). High-speed interferometric FBG interrogator with dynamic and absolute wavelength measurement capability. Journal of Lightwave Technology, 31(17), 2897-2903. https://doi.org/10.1109/JLT.2013.2276391