Efficient demodulation algorithm for fiber Bragg grating strain sensor

Dailin Li; Yi Ni; Yu Guo; Tao Yu; Jinghui Zhang

doi:10.1117/1.OE.56.11.117108

24 November 2017 Efficient demodulation algorithm for fiber Bragg grating strain sensor

Dailin Li, Yi Ni, Yu Guo, Tao Yu, Jinghui Zhang

Author Affiliations +

Optical Engineering, Vol. 56, Issue 11, 117108 (November 2017). https://doi.org/10.1117/1.OE.56.11.117108

Abstract

An accurate and efficient demodulation algorithm for a fiber Bragg grating (FBG) strain sensor has been proposed and demonstrated. An accurate demodulation can be achieved by scanning only the 0.15-nm reflection spectrum of the FBG sensor instead of scanning the complete reflection spectrum. The proposed algorithm was first used to calculate the integration of 15 regions (10 pm per region) to calculate the wavelength drift. This algorithm is good in that the demodulation time can be greatly reduced without degrading the demodulation accuracy. Hence, the efficient algorithm, which can support a short demodulation time of a low-cost demodulation system, is very suitable for high demodulation rate requirements of the high-speed sensing systems.

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Dailin Li, Yi Ni, Yu Guo, Tao Yu, and Jinghui Zhang "Efficient demodulation algorithm for fiber Bragg grating strain sensor," Optical Engineering 56(11), 117108 (24 November 2017). https://doi.org/10.1117/1.OE.56.11.117108

Received: 2 August 2017; Accepted: 9 November 2017; Published: 24 November 2017

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KEYWORDS

Demodulation

Fiber Bragg gratings

Sensors

MATLAB

Nickel

Error analysis

Light sources

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