Autocorrelation demodulation technique for fiber Bragg grating sensor

In this letter, we describe a very accurate and simple demodulation technique for fiber Bragg grating sensors. The technique is suitable for both single and twin Bragg gratings. A twin grating is composed of two identical gratings located at different positions in the same single-mode fiber. Our dem...

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Bibliographic Details
Published in:IEEE photonics technology letters 2004-10, Vol.16 (10), p.2320-2322
Main Authors: Caucheteur, C., Chah, K., Lhomme, F., Blondel, M., Megret, P.
Format: Article
Language:English
Subjects:
Autocorrelation
Bragg gratings
Demodulation
Diffraction gratings
Fiber gratings
Fibers
Gratings (spectra)
Optical fiber sensors
Optical fiber testing
Reflection
Sensor phenomena and characterization
Sensors
Temperature sensors
Wavelength measurement
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Summary:In this letter, we describe a very accurate and simple demodulation technique for fiber Bragg grating sensors. The technique is suitable for both single and twin Bragg gratings. A twin grating is composed of two identical gratings located at different positions in the same single-mode fiber. Our demodulation technique evaluates the wavelength position of the reflection spectrum with respect to the spectrum of an undisturbed sensor. To calculate the spectrum shift, it computes the autocorrelation product between the two reflection spectra. The demodulation method, which is very fast, has been tested experimentally with temperature sensors. It gives absolute measurements and provides high accuracy compared to a conventional temperature probe.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2004.833106