Biomedical Imaging GroupSTI
English only   BIG > Publications > Fibre Bragg Grating

 Home Page
 News & Events
 Tutorials and Reviews
 Download Algorithms

 PDF not available
 PS not available
 All BibTeX References

High Resolution Fibre Bragg Grating Sensor Demodulation Using a Diffraction Grating Spectrometer and CCD Detection

A. Ezbiri, A. Muñoz Barrutia, S.E. Kanellopoulos, V.A. Handerek

Proceedings of the 1997/033 IEE Colloquium on Optical Techniques for SMART Structures and Structural Monitoring (OTSMARTSSM'97), London, United Kingdom, February 17, 1997, pp. 5/1-5/6.

In-fibre written Bragg gratings (FBGs) have been shown to offer many advantages over conventional interferometric and polarimetric sensors in particular for applications requiring embedded sensors. In certain implementations, robust readout systems are necessary requiring immunity to vibration and the ability to operate at changing temperatures and pressure levels. These requirements may sometimes rule out the use of established demodulation schemes, or the use of passive optical fibers that are inherently susceptible to temperature fluctuations. Another important parameter of signal processing techniques is the possibility of addressing more than one single sensor. In this article, a passive WDM multiplexed technique for high resolution detection of the wavelength of peak reflection from FBGs is reported. The approach is based on overcoming the low spectral resolution associated with inexpensive grating and linear array CCD detector combinations, which is typically 0.1 nm. Initial results obtained in our laboratories indicate that a resolution of 1 pm can easily be achieved. We also report a demodulation technique, based on curve fitting algorithms, that uses short broadband gratings and that can be used with low levels of light at the detector.

AUTHOR="Ezbiri, A. and Mu{\~{n}}oz Barrutia, A. and Kanellopoulos,
        S.E. and Handerek, V.A.",
TITLE="High Resolution Fibre {B}ragg Grating Sensor Demodulation
        Using a Diffraction Grating Spectrometer and {CCD} Detection",
BOOKTITLE="Proceedings of the 1997/033 {IEE} Colloquium on Optical
        Techniques for {SMART} Structures and Structural Monitoring
address="London, United Kingdom",
month="February 17,",

© 1997 IEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from IEE.
This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.