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Distributed hydrophone based on ultra-bend-resistant multi-core optical fiber flexible 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: 2021-10-26
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 ultra-bend-resistant multi-core optical fiber flexible cable
  • Distributed hydrophone based on ultra-bend-resistant multi-core optical fiber flexible cable
  • Distributed hydrophone based on ultra-bend-resistant multi-core optical fiber flexible cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] figure 1 Indicates that the super-bend-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-bend-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-bend-resistant multi-core optical fiber flexible optical cable 101 needs to be towed or buried shallowly underwater.

[0058] Such as figure 2 (a) and figure 2 As shown in (b), there are two ways to apply the frequency-division multiplexing super-bend-resistant multi-core optical fiber distributed hydrophone. The first application method is as figure 2 As shown in (a), the underwater acoustic transducer 102 emits sound waves of a specific wavelength, and when encountering a target object, the objec...

Embodiment 2

[0072]Based on Embodiment 1, the ultra-strong bending-resistant multi-core optical fiber flexible optical cable 101 of the present application is refined; the ultra-strong bending-resistant multi-core optical fiber flexible optical cable 101 contains p multi-core optical fibers, and there are q fibers in each multi-core optical fiber core.

[0073] Figure 8 What is shown is the case where there are 2 multi-core optical fibers in the ultra-strong bending-resistant multi-core optical fiber flexible optical cable 101 . Figure 8 (a) shows the schematic 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 (this embodiment shows two multi-core optical fibers 8041 and 8042) is protected by a tight casing 803 (this embodiment shows two tight casing tubes 8031 ​​and 8032). The center of the optical cable is supported by a central support layer 802 made of cylindrical soft mat...

Embodiment 3

[0080] Based on embodiment 1, the distributed optical fiber hydrophone 201 system combining space division multiplexing and space division multiplexing of the present application is refined, and the details are as follows:

[0081] 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 sequentially connected by using a commercial single-mode optical fiber; The optical fiber connects the demultiplexing module 306 and the photodetection module 307; the output end of the photodetection module 307 is sequentially connected with the sampling module 308 and the signal analysis module 309 with an electric signal transmission line.

[0082] The laser 301 emits a high-coherence and low-phase-noise single-frequency laser input to the pulse modulation module 302 for modulation into a spe...

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Abstract

The invention discloses a distributed hydrophone based on a super-bending-resistant multi-core optical fiber flexible optical cable, which relates to the field of optical fiber sensing and hydrophones; it includes sequentially connected distributed optical fiber hydrophones and super-bending-resistant multi-core Optical fiber flexible optical cable; the above-mentioned optical cable includes a central support layer, p multi-core optical fibers and an outer sheath, each multi-core optical fiber includes q cores, the multi-core optical fiber is covered with a tight sleeve, and the p multi-core optical fibers are in the same direction, etc. The pitch is helically wound on the central support layer; the distributed optical fiber hydrophone includes a pulse modulation module, a demultiplexing module and a multiplexing module, and the signals in multiple multi-core optical fibers are space-division multiplexed at the same time Time-division channels adopt frequency-division multiplexing. The present invention combines space division multiplexing with frequency division multiplexing, and the frequency response range of the system to external sound waves is greatly improved to meet the needs of hydrophones; the flexible optical cable greatly increases the sensitivity to external sound pressure; at the same time, the cost is low and the sensitivity of each position Same, suitable for long-distance monitoring and large-scale networking.

Description

technical field [0001] The invention relates to the fields of optical fiber sensing and hydrophones, in particular to a distributed hydrophone based on a superbend-resistant multi-core optical fiber flexible optical cable. Background technique [0002] Acoustic signals are the only form of energy that can travel long distances in seawater. Therefore, using 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, due to the needs of marine military, hydrophones were rapidly developed as an important tool for sensing ocean information. In the following less than 100 years, the principles and performance indicators of hydrophones have experienced many revolutionary developments, and they are still widely studied and paid attention to today. [0003] Hydrophones, which were develope...

Claims

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Application Information

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