25 October 2017 An interferometric fiber optic hydrophone with large upper limit of dynamic range
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Proceedings Volume 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications; 104641H (2017) https://doi.org/10.1117/12.2285277
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China
Abstract
Interferometric fiber optic hydrophone based on heterodyne detection is used to measure the missile dropping point in the sea. The signal caused by the missile dropping in the water will be too large to be detected, so it is necessary to boost the upper limit of dynamic range (ULODR) of fiber optic hydrophone. In this article we analysis the factors which influence the ULODR of fiber optic hydrophone based on heterodyne detection, the ULODR is decided by the sampling frequency fsam and the heterodyne frequency Δf. The sampling frequency and the heterodyne frequency should be satisfied with the Nyquist sampling theorem which fsam will be two times larger than Δf, in this condition the ULODR is depended on the heterodyne frequency. In order to enlarge the ULODR, the Nyquist sampling theorem was broken, and we proposed a fiber optic hydrophone which the heterodyne frequency is larger than the sampling frequency. Both the simulation and experiment were done in this paper, the consequences are similar: When the sampling frequency is 100kHz, the ULODR of large heterodyne frequency fiber optic hydrophone is 2.6 times larger than that of the small heterodyne frequency fiber optic hydrophone. As the heterodyne frequency is larger than the sampling frequency, the ULODR is depended on the sampling frequency. If the sampling frequency was set at 2MHz, the ULODR of fiber optic hydrophone based on heterodyne detection will be boosted to 1000rad at 1kHz, and this large heterodyne fiber optic hydrophone can be applied to locate the drop position of the missile in the sea.
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lei Zhang, Lei Zhang, Baoxi Kan, Baoxi Kan, Baichao Zheng, Baichao Zheng, Xuefeng Wang, Xuefeng Wang, Haiyan Zhang, Haiyan Zhang, Liangbin Hao, Liangbin Hao, Hailiang Wang, Hailiang Wang, Zhenxing Hou, Zhenxing Hou, Wenpeng Yu, Wenpeng Yu, } "An interferometric fiber optic hydrophone with large upper limit of dynamic range", Proc. SPIE 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications, 104641H (25 October 2017); doi: 10.1117/12.2285277; https://doi.org/10.1117/12.2285277
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