Ou Xu, Xiashan Fu. Temperature-Insensitive Method for Interrogating Fiber Grating Sensor Using Dual Phase-Shifted Fiber Grating and Optoelectronic Oscillator[J]. Laser & Optoelectronics Progress, 2019, 56(15): 150601
- Laser & Optoelectronics Progress
- Vol. 56, Issue 15, 150601 (2019)
Fig. 1. Schematic of interrogation system based on dual-phase-shifted fiber grating
Fig. 2. Principle of microwave photonic filter based on dual-phase-shifted fiber grating. (a) Reflection spectrum of fiber grating with two phase shifts;(b) power spectrum of microwave photonic filter based on phase-shifted fiber grating
Fig. 3. Operating principle of proposed interrogation system. (a) Original states; (b) when measurand changes are experienced by phase shift at central frequency of fp2; (c) when only ambient temperature changes; (d) when carrier frequency fluctuates
Fig. 4. Measured results. (a) Measured transmission spectrum of phase-shifted fiber grating; (b) measured frequency response of dual-passband microwave photonic filter
Fig. 5. Microwave signals produced after OEO is closed
Fig. 6. Measured output microwave frequency change of OEO when different strains are applied on one of two phase shifts in the dual-phase-shifted fiber grating
Fig. 7. Applied strain as a function of beat frequency measured in experiment (small blue squares represent experimental results and blue solid line represents linear fitting result)
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