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19 October 2016 Influence analysis of an asymmetrical suspension system on triaxial signals' phase differences of fiber optic vector hydrophones
Jing Zhu, Jun Wang, Xingshu Wang, Yanqun Wu, Zhengliang Hu, Yongming Hu
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Proceedings Volume 10152, High Power Lasers, High Energy Lasers, and Silicon-based Photonic Integration; 1015208 (2016) https://doi.org/10.1117/12.2243853
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China
Abstract
In asymmetrical suspension systems, triaxial signals' phase differences of fiber optic vector hydrophones are nonzero, which is a serious problem for direction of arrival (DOA) estimations of underwater acoustic signals. In this paper, an asymmetrical suspension system is described. Dynamics analysis of the suspension system is performed by using the analytic geometry method. Triaxial resonant frequencies of the suspension system are gotten, phase delays between the outer signals and the hydrophone's triaxial signals are derived, and influence of the suspension system on phase differences in low frequency zone is theoretically explained and simulated. Then frequency responses of the hydrophone in four suspension states are tested in a standing wave tube. The results indicate that both phase differences of xy axes and zy axes are large at resonant frequencies of the suspension system, which is approximately coincided with the theoretical analysis. Phase difference of zy axes at frequency higher than 500 Hz is obvious, which results from resonant responses of the fiber optic vector hydrophone. It proves that symmetry of the suspension system has great influence on phase differences of the fiber optic vector hydrophones.
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Jing Zhu, Jun Wang, Xingshu Wang, Yanqun Wu, Zhengliang Hu, and Yongming Hu "Influence analysis of an asymmetrical suspension system on triaxial signals' phase differences of fiber optic vector hydrophones", Proc. SPIE 10152, High Power Lasers, High Energy Lasers, and Silicon-based Photonic Integration, 1015208 (19 October 2016); https://doi.org/10.1117/12.2243853
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Fiber optics
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