研究目的
Investigating the resonant frequency of optical fiber vector sensors (OFVS) with different packages operating in water.
研究成果
The study found that the resonant frequency of OFVS differs with package types and mass, revealing double resonant frequencies not explained by existing models. It concludes that the performance of OFVS should consider the effect of the operating medium, suggesting the system be modeled as a two-degree-of-freedom mass-spring system. Further research is needed to explore these findings in more detail.
研究不足
The classical and improved models were found to be invalid for the OFVS system under study, as they could not predict the double resonant frequencies observed. The study suggests that the OFVS should be considered as a two-degree-of-freedom mass-spring system, indicating a need for more detailed theoretical and experimental research.
1：Experimental Design and Method Selection:
The study involved experimental investigation of the resonant frequency of OFVS in different packages (spherical and cylindrical) and with different masses. The setup included launching frequency modulated light into the OFVS, which was placed in a water-filled shielding housing to prevent environmental noise. The output interference light was detected and processed using phase generated carrier (PGC) demodulation technique.
2：Sample Selection and Data Sources:
Three three-axis accelerometers were established, two packaged in spherical shells of different masses (200g and 390g) and one in a cylindrical shell (1164g).
3：List of Experimental Equipment and Materials:
The experimental setup included a frequency modulated light source, OFVS, shielding housing, isolator, detector, and computer with PGC demodulation software.
4：Experimental Procedures and Operational Workflow:
The resonant frequency was obtained by measuring the phase noise spectrum of the OFVS, where the peak of the noise spectrum corresponded to the resonance of the OFVS.
5：Data Analysis Methods:
The noise spectrum was analyzed to identify resonant frequencies, comparing experimental results with theoretical predictions from classical and improved models.
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