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Distributed sound-sensitive optical fiber sensor and manufacturing method thereof

An optical fiber sensor, distributed technology, applied in the direction of light guide, optics, instruments, etc., can solve the problems of insensitivity to sound and vibration, high cost, short detection distance, etc. Effect

Pending Publication Date: 2022-01-07
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the defects of insensitivity to sound and vibration, short detection distance and high cost of optical cables produced in the prior art, the present invention provides a distributed sound-sensitive optical fiber sensor and its manufacturing method

Method used

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  • Distributed sound-sensitive optical fiber sensor and manufacturing method thereof
  • Distributed sound-sensitive optical fiber sensor and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0032] A kind of distributed sound-sensitive optical fiber sensor structure of the present embodiment, such as figure 1 with 2 shown, where figure 1 The middle part is a schematic diagram of an internal cross-section, including a hollow metal or non-metal protective sleeve 1 , a metal or non-metal sheet 2 placed in the protective sleeve 1 , and an optical fiber 3 laid on the sheet 2 . Described optical fiber 3 is formed by high-purity quartz through high-temperature melting and drawing, and its own air or water pressure resistance is very strong. This embodiment is applied to high-pressure environments such as deep sea and pressure pipelines. Stainless steel sleeves and sheets are used to protect the optical fiber 3 from external force damage. The optical fiber 3 directly contacts other media such as water, and the sound or vibration transmitted through water It will directly propagate to the optical fiber 3, thereby improving the coupling efficiency between the sound or vib...

Embodiment 2

[0042] The difference between this embodiment and embodiment 2 is that it is used in a corrosive environment, so a protective sleeve 1 and a sheet 2 of non-metallic anti-corrosion material epoxy resin are used; and a hollowed-out protective sleeve 1 without an axial opening is adopted, and used The thin slice is implanted in the hollow protective casing 1 by traction.

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Abstract

The invention provides a distributed sound-sensitive optical fiber sensor and a manufacturing method thereof. The sensor comprises a hollow metal or non-metal protective sleeve and a metal or non-metal sheet arranged in the protective sleeve, and an optical fiber is laid on the sheet. According to the distributed sound-sensitive optical fiber sensor, the optical fiber is formed by melting and drawing high-purity quartz at a high temperature, the air or water pressure resistance of the optical fiber is very high, and the hollow protective sleeve is adopted instead of a loose sleeve of a conventional communication optical cable to protect the optical fiber, so that the air or water pressure resistance of the distributed sound-sensitive optical fiber sensor is greatly improved; the optical fiber is in direct contact with various media such as air or water, and sound or vibration transmitted through the air or the water can be directly transmitted to the optical fiber, so that the coupling efficiency between the sound or the vibration and the optical fiber is improved, and the distributed sound-sensitive optical fiber sensor is of great significance especially for deep sea long-distance large-range sound detection.

Description

technical field [0001] The invention relates to a distributed sound-sensitive optical fiber sensor and a manufacturing method thereof, and belongs to the field of optical fiber early warning using sound or vibration signal collection. Background technique [0002] Sound is an important physical quantity. By monitoring sound or vibration signals, abnormal events can be detected in time and safety warnings can be provided. According to the International Telecommunication Union and my country's national standards, when producing optical cables, it is necessary to use many layers of materials of different materials to protect the optical fibers from various external interferences. When this kind of communication optical cable is used to collect sound signals in a distributed manner, the sound or vibration signals need to pass through the outer sheath of the optical cable, plastic-coated corrugated steel strip and / or aluminum strip longitudinal cladding, non-woven wrapping tape, ...

Claims

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Application Information

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IPC IPC(8): G01H9/00G02B6/44
CPCG01H9/004G02B6/4459
Inventor 朱新民缪宏韩瑞华戴荣荣缪文韬冯少孔卢正超白喜亮巩维屏聂鼎黄涛马宝龙杨栋于帆肖俊淼杨璐菲
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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