All-fiber towed hydrophone array, manufacturing method and hydrophone method

An all-fiber and hydrophone technology, which is applied in the direction of cladding optical fiber, grating fiber, multi-core optical fiber, etc., can solve the problem of difficult to achieve high-precision array self-correction, so as to avoid underwater electromagnetic pulse interference and improve the application performance and improve positioning accuracy

Active Publication Date: 2022-06-28
WUHAN UNIV OF TECH
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Problems solved by technology

[0006] In summary, the existing towed hydrophone array is difficult to achieve high-precision array self-calibration

Method used

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  • All-fiber towed hydrophone array, manufacturing method and hydrophone method
  • All-fiber towed hydrophone array, manufacturing method and hydrophone method
  • All-fiber towed hydrophone array, manufacturing method and hydrophone method

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments:

[0028] like Figures 1 to 4 The shown all-fiber towed hydrophone array includes an all-fiber attitude sensor 1, a hollow tube 2, a hollow mandrel 3 and a tight-packed grating array fiber 4. The all-fiber attitude sensor 1 (1 mm in diameter) consists of four The core grating array fiber 1.1 and the protective layer 1.2 covering the four-core grating array fiber 1.1 are composed. , the tight-packed grating array fiber 4 adopts the alternately dense and sparse winding method, and is wound on the hollow mandrel 3 with a constant tension, and the winding tension is maintained at 50-200g, which can be adjusted to improve the coupling between the tight-packed grating array fiber and the mandrel. Efficiency, to avoid slack in the tight-packed grating array fiber winding, which affects the measurement of sound pressure signals. Two adjacent g...

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Abstract

The invention discloses an all-fiber towed hydrophone array which comprises an all-fiber attitude sensor, a hollow tube, a hollow mandrel and a tightly-wrapped grating array fiber, the all-fiber attitude sensor is composed of a four-core grating array fiber and a protective layer wrapping the four-core grating array fiber, the hollow tube is coaxially sleeved outside the all-fiber attitude sensor, and the hollow tube is sleeved outside the hollow tube. The hollow core shaft is coaxially sleeved outside the hollow pipe, the tightly-wrapped grating array optical fiber is wound on the hollow core shaft with constant tension in a dense and sparse alternate winding mode, and two adjacent gratings in the tightly-wrapped grating array optical fiber form a sound pressure signal measuring area. Underwater sound pressure signal detection is realized by combining a grating array fiber with low bending loss with an interference type phase demodulation technology, and towed array shape correction is realized by combining a four-core grating array fiber with an optical frequency domain demodulation technology.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber sensing, in particular to an all-fiber towed hydrophone array, a manufacturing method and a hydrophone method. Background technique [0002] The towed hydrophone array is an effective technical means to implement long-range, low-frequency acoustic detection for weak and small underwater targets. However, due to the influence of its own gravity and the wake of the towed submarine, the hydrophone array is prone to bending deformation during the towing process, and it is difficult to maintain a linear shape, which makes the reconstructed sound field signal deviate in the spatial distribution, resulting in the target Positioning is not accurate. Therefore, it is necessary to correct the formation of the towed hydrophone array to improve the detection accuracy of underwater weak and small targets. [0003] The existing towed array formation correction techniques are mainly divided i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00G02B6/02G02B6/44
CPCG01H9/004G02B6/443G02B6/4479G02B6/02042G02B6/02057
Inventor 李政颖王昌佳桂鑫王一鸣高俊彭子健
Owner WUHAN UNIV OF TECH
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