
Proceedings Paper
Serial FBG sensor network allowing overlapping spectraFormat | Member Price | Non-Member Price |
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Paper Abstract
For structure or material monitoring low impact serial fiber Bragg grating (FBG) networks have attracted increasing
research interest. Common sensor networks using wavelength division multiplexing (WDM) for FBG interrogation are
limited in their efficiency by the spectral width of their light source, the FBG tuning range and the spectral guard bands.
Overlapping spectra are strictly forbidden in this case. Applying time division multiplexing (TDM) or active resonator
schemes may overcome these restrictions. However, they introduce other substantial disadvantages like signal roundtrip
dependency or sophisticated control of active resonating structures. Code division multiplexing (CDM) as a means of
FBG interrogation by simple autocorrelation of appropriate codes has been shown to be superior in this respect.
However, it came at the cost of a second spectrometer introducing additional equalization efforts. We demonstrate a new
serial FBG sensor network utilizing CDM signal processing for efficient sensor interrogation without the need of a
second spectrometer and additional state of polarization (SOP) controlling components. It allows overlapping spectra
even when all sensing FBGs are positioned at the same centre wavelength and it shows a high degree of insensitivity to
SOP. Sequence inversed keyed (SIK) serial signal processing utilizing quasi-orthogonal balanced codes ensures simple
and quick sensor interrogation with high signal-to-interference/noise ratio.
Paper Details
Date Published: 30 May 2016
PDF: 4 pages
Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99162G (30 May 2016); doi: 10.1117/12.2235279
Published in SPIE Proceedings Vol. 9916:
Sixth European Workshop on Optical Fibre Sensors
Elfed Lewis, Editor(s)
PDF: 4 pages
Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99162G (30 May 2016); doi: 10.1117/12.2235279
Show Author Affiliations
A. Ahrens, Hochschule Wismar (Germany)
B. Rehm, Hochschule Wismar (Germany)
B. Rehm, Hochschule Wismar (Germany)
Published in SPIE Proceedings Vol. 9916:
Sixth European Workshop on Optical Fibre Sensors
Elfed Lewis, Editor(s)
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