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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 6 — Mar. 24, 2014
  • pp: 7099–7112

A novel fast phase correlation algorithm for peak wavelength detection of fiber Bragg grating sensors

A. Lamberti, S. Vanlanduit, B. De Pauw, and F. Berghmans  »View Author Affiliations


Optics Express, Vol. 22, Issue 6, pp. 7099-7112 (2014)
http://dx.doi.org/10.1364/OE.22.007099


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Abstract

Fiber Bragg Gratings (FBGs) can be used as sensors for strain, temperature and pressure measurements. For this purpose, the ability to determine the Bragg peak wavelength with adequate wavelength resolution and accuracy is essential. However, conventional peak detection techniques, such as the maximum detection algorithm, can yield inaccurate and imprecise results, especially when the Signal to Noise Ratio (SNR) and the wavelength resolution are poor. Other techniques, such as the cross-correlation demodulation algorithm are more precise and accurate but require a considerable higher computational effort. To overcome these problems, we developed a novel fast phase correlation (FPC) peak detection algorithm, which computes the wavelength shift in the reflected spectrum of a FBG sensor. This paper analyzes the performance of the FPC algorithm for different values of the SNR and wavelength resolution. Using simulations and experiments, we compared the FPC with the maximum detection and cross-correlation algorithms. The FPC method demonstrated a detection precision and accuracy comparable with those of cross-correlation demodulation and considerably higher than those obtained with the maximum detection technique. Additionally, FPC showed to be about 50 times faster than the cross-correlation. It is therefore a promising tool for future implementation in real-time systems or in embedded hardware intended for FBG sensor interrogation.

© 2014 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(070.4790) Fourier optics and signal processing : Spectrum analysis
(070.7145) Fourier optics and signal processing : Ultrafast processing

ToC Category:
Sensors

History
Original Manuscript: December 11, 2013
Revised Manuscript: February 12, 2014
Manuscript Accepted: February 16, 2014
Published: March 19, 2014

Citation
A. Lamberti, S. Vanlanduit, B. De Pauw, and F. Berghmans, "A novel fast phase correlation algorithm for peak wavelength detection of fiber Bragg grating sensors," Opt. Express 22, 7099-7112 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-6-7099


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