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Distributed hydrophone based on super-high bending-resistant multi-core optical fiber flexible optical cable

A multi-core optical fiber and hydrophone technology, which is used in instruments, scientific instruments, seismic signal receivers, etc., can solve problems such as inability to apply to large-scale networking applications, unstable response to external acoustic waves, and blind spots of external acoustic signals. The effect of improved sensitivity, improved sensitivity, and low cost

Active Publication Date: 2019-11-15
ZHEJIANG LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sensitivity of this technology is very high, but its response to external sound waves is unstable, and packaging is difficult, and the cost remains high, so it cannot be applied to large-scale networking applications
[0006] In addition, the above-mentioned three hydrophones are all designed based on point sensors. Therefore, in the process of large-scale networking, due to the large interval between adjacent detection points, the perception of external acoustic signals by the system as a whole has an airspace. large blind spot

Method used

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  • Distributed hydrophone based on super-high bending-resistant multi-core optical fiber flexible optical cable
  • Distributed hydrophone based on super-high bending-resistant multi-core optical fiber flexible optical cable
  • Distributed hydrophone based on super-high bending-resistant multi-core optical fiber flexible optical cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] figure 1 It means that the ultra-strong bending-resistant multi-core optical fiber distributed hydrophone based on frequency division multiplexing can be divided into two parts, the first part is the main body of the distributed optical fiber hydrophone 201, and the other part is the super-strong bending resistant multi-core optical fiber flexible optical cable 101. The main body of the distributed optical fiber hydrophone 201 needs to be placed on the ship or on the shore, and the super-bending multi-core optical fiber flexible optical cable 101 needs to be towed or buried shallowly under water.

[0056] Such as figure 2 (a) and figure 2 As shown in (b), the frequency division multiplexing superbend-resistant multi-core fiber distributed hydrophone can be applied in two ways. The first application is like figure 2 As shown in (a), the underwater acoustic transducer 102 emits a sound wave of a specific wavelength. After encountering a target object, the object modulates...

Embodiment 2

[0068] Based on Example 1, the super-strong bending-resistant multi-core optical fiber flexible optical cable 101 of the present application is refined; suppose that the super-strong bending resistant multi-core optical fiber flexible optical cable 101 contains p multi-core optical fibers, and each multi-core optical fiber has q fibers core.

[0069] Figure 8 Shown here is a case where there are two multi-core optical fibers in the super-bending-resistant multi-core optical fiber flexible optical cable 101. Figure 8 (a) A schematic diagram showing the cross-section of the optical cable; Figure 8 (b) shows the longitudinal structure of the optical cable. Each multi-core optical fiber 803 in the optical cable (in this embodiment shows two multi-core optical fibers 8041 and 8042) is protected by a tight-wrapped sleeve 803 (this embodiment shows two tight-wrapped sleeves 8031 ​​and 8032). The center of the optical cable is supported by a central support layer 802, and the material...

Embodiment 3

[0076] Based on Embodiment 1, the distributed optical fiber hydrophone 201 system combining space division multiplexing and space division multiplexing of this application is refined, and the details are as follows:

[0077] The structure of the main body of the distributed optical fiber hydrophone 201 is as image 3 Shown. The system includes a laser 301, a pulse modulation module 302, a multiplexing module 303, a circulator unit 304, and an optical cable connection module 305 that are sequentially connected using a commercial single-mode optical fiber; the 3 ports of the circulator unit 304 also use commercial single-mode The optical fiber is connected to the demultiplexing module 306 and the photodetection module 307; the output end of the photodetection module 307 is connected to the sampling module 308 and the signal analysis module 309 in sequence with electrical signal transmission lines.

[0078] The laser 301 emits a single-frequency laser with high coherence and low phase...

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Abstract

The invention discloses a distributed hydrophone based on a super-high bending-resistant multi-core optical fiber flexible optical cable and relates to the fields of optical fiber sensing and hydrophones. The distributed hydrophone comprises a distributed optical fiber hydrophone and the super-high bending-resistant multi-core optical fiber flexible optical cable which are sequentially connected,wherein the optical cable comprises a central support layer, p multi-core optical fibers and an outer protection layer; each multi-core optical fiber comprises q fiber cores and is sleeved with a close wrap casing, and the p multi-core optical fibers spirally wind around the central support layer at equal intervals in the same direction; the distributed optical fiber hydrophone comprises a pulse modulation module, a demultiplexing module and a multiplexing module, and frequency division multiplexing is performed on each time division channel during space division multiplexing of signals in themultiple multi-core optical fibers. Space division multiplexing and frequency division multiplexing are combined, the frequency response range of the system for external acoustic waves is substantially increased to meet the demand of the hydrophone; the flexible optical cable substantially improves the sensitivity to external acoustic pressure; meanwhile, the distributed hydrophone has low cost and the same sensitivity in all positions and is applicable to long-distance monitoring and large-scale networking.

Description

Technical field [0001] The invention relates to the field of optical fiber sensing and hydrophones, in particular to a distributed hydrophone based on a super-bending multi-core optical fiber flexible optical cable. Background technique [0002] Sound signals are the only energy form that can travel long distances in seawater. Therefore, the use of sound waves as information carriers to monitor the acoustic characteristics of underwater targets has a wide range of applications in military, national defense, people's livelihood, scientific research and other fields. In the early days of World War II, hydrophones were quickly developed as an important tool for sensing marine information due to the needs of marine military. In the following less than 100 years, the principles and performance indicators of hydrophones have undergone many revolutionary developments, and they are still widely studied and paid attention to today. [0003] The early developed and widely used hydrophones u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/18G01H9/00
CPCG01H9/006G01V1/186
Inventor 饶云江傅芸
Owner ZHEJIANG LAB
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