Due to the limitations of structure and materials of the traditional F-P sensor, it is difficult to complete the measurement work under harsh and complex working conditions such as aero engines, and it is easy to brittle and fail under complex internal and external forces. In order to improve the reliability of the optical fiber F-P sensor under harsh working conditions, this paper proposes a new type of stainless steel/quartz nested composite F-P sensor, which can not only realize strain measurement, but also reduce the influence of the external harsh working environment on the fragile optical fiber and the capillary quartz tube, effectively reduce the impact of air flow on the sensing element in the working environment, and significantly improve the wind load resistance of the F-P sensor.
We use polarization-dependent gain in a twisted birefringent medium to realize a sub-megahertz linewidth optical feature. Our approach is loss-free, resonator-free, and cost-effective, offering high sensitivity and on-demand tunability.
We demonstrate a high spatial resolution multiplexing scheme for fiber Bragg grating (FBG) sensors based on single-arm frequency-shifted interferometry (SA-FSI). The SA-FSI system uses an incoherent broadband source, a slow detector, and an electro-optic modulator (EOM). By sweeping the frequency of EOM and taking the fast Fourier transform (FFT) of the interference signal, we resolved the locations of FBGs distributed both in parallel and in series along fiber links despite their reflection spectral overlap. Eighteen weak FBGs (~5% reflectivity) separated by ~0.1 m were clearly resolved experimentally, sweeping EOM modulation frequency in the range of 2-11 GHz.
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