• Chinese Journal of Lasers
  • Vol. 45, Issue 3, 310001 (2018)
Tang Bo*, Huang Junbin, and Gu Hongcan
Author Affiliations
  • [in Chinese]
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    DOI: 10.3788/CJL201845.0310001 Cite this Article Set citation alerts
    Tang Bo, Huang Junbin, Gu Hongcan. Low Acceleration Sensitivity DFB Fiber Laser Hydrophone[J]. Chinese Journal of Lasers, 2018, 45(3): 310001 Copy Citation Text show less

    Abstract

    To reduce the influences of acceleration response of distributed feedback (DFB) fiber laser hydrophone on underwater acoustic detection, we design a DFB fiber laser hydrophone with sensitivity-enhanced structure through polyurethane end surface pulling. Firstly, we establish the acceleration sensitivity model of the designed hydrophone. Secondly, we theoretically analyze the relationship between the sleeve structure and the acceleration sensitivity. Thirdly, we simulate the relationship between elastic modulus, Poisson′s ratio, and height difference and acceleration sensitivity. Fourthly, we optimize the structure and materials parameters of hydrophone. At last, we fabricate and test the prototype samples of hydrophones and towed line array samples. The experimental results show that the acceleration sensitivity is less than 1.2 dB at each frequency point in the frequency range of 20-2000 Hz, which agrees well with theoretical results. The towed line array can form stable beam pointing with high noise-signal ratio during the variable speed motion phase of dynamic drag. The anti-acceleration performance of the hydrophone is effectively predicted and experimentally verified.
    Tang Bo, Huang Junbin, Gu Hongcan. Low Acceleration Sensitivity DFB Fiber Laser Hydrophone[J]. Chinese Journal of Lasers, 2018, 45(3): 310001
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