Elimination of environmental noise in interferometric wavelength shift demodulation for dynamic fiber Bragg grating sensor array
✍ Scribed by Jun He; Fang Li; Lei Feng; Hao Xiao; Yuliang Liu
- Book ID
- 103874249
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 723 KB
- Volume
- 282
- Category
- Article
- ISSN
- 0030-4018
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✦ Synopsis
We present a novel reference compensation method for eliminating environmental noise in interferometric wavelength shift demodulation for dynamic fiber Bragg grating (FBG) sensors. By employing a shielded wavelength-division-multiplexed reference FBG in the system, the environmental noise is measured from the reference channel, and then subtracted from the demodulation result of each sensor channel. An approximate 40 dB reduction of the environmental noise has been experimentally achieved over a frequency range from 20 Hz to 2 kHz. This method is also suitable for the elimination of broadband environmental noise. The corresponding FBG sensor array system proposed in this paper has shown a wavelength resolution of 7 Â 10 À4 pm= ffiffiffiffiffiffi ffi Hz p .