27 March 2013 An FBG sensor interrogation technique based on a precise optical recirculating frequency shifter driven by RF signals
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Abstract
Fiber Bragg grating (FBG) sensors have numerous advantages to sense multi-physical quantities such as the temperature and strain simultaneously by monitoring the shift of the returned “Bragg” wavelength resulting from changes in these quantities. Several FBG interrogation systems have been set up using photo detectors instead of an optical spectrum analyzer (OSA) to convert wavelength to time measurements. However, in those systems, it is necessary to use mechanical tuning components to generate fast-speed wavelength-swept light sources for high-precision FBG interrogation. In this paper, a low-cost and delicate wavelength-shift detection system, without any mechanical scanning parts, is proposed and demonstrated. The wavelength scanning system is a recirculating frequency shifter (RFS) which consists of an optical amplifier, an under test FBG sensor and an optical single-sideband (SSB) modulator driven by RF signals at 10 GHz. The measurement accuracy of this system is 0.08nm.
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Zifei Wang, Tianxin Yang, Dongfang Jia, Zhaoying Wang, Mei Sang, "An FBG sensor interrogation technique based on a precise optical recirculating frequency shifter driven by RF signals", Proc. SPIE 8624, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VI, 86240W (27 March 2013); doi: 10.1117/12.2001003; https://doi.org/10.1117/12.2001003
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