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Mine safety early warning system based on multi-fiber-core optical fibers

A coal mine safety and early warning system technology, applied in mining equipment, mining equipment, earthwork drilling and mining, etc., to achieve the effects of saving communication bandwidth, avoiding system errors, and reducing costs and complexity

Inactive Publication Date: 2015-03-25
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] None of the above technologies and patents can realize the requirement of distributed comprehensive measurement of multiple parameters at the same time with one optical fiber. Based on this, the present invention proposes a multi-core optical fiber sensing technology to simultaneously measure downhole temperature, strain and vibration.

Method used

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  • Mine safety early warning system based on multi-fiber-core optical fibers
  • Mine safety early warning system based on multi-fiber-core optical fibers
  • Mine safety early warning system based on multi-fiber-core optical fibers

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Embodiment Construction

[0020] Such as figure 1 As shown, the present invention includes: a multi-core optical fiber, a multi-core fiber splitter, a light source module and a demodulation module; using different or the same light source modules, the light is coupled into the multi-core fiber through the multi-core fiber splitter Optical fiber and multi-core optical fiber splitter send different physical quantities to be monitored to the demodulation system for demodulation.

[0021] The overall structure of the system is shown in figure 2 shown. The optical fiber part in the middle section can be a standard single-mode optical fiber with 3 cores, 4 cores or more. According to the physical quantity to be monitored, the optical fiber core can be increased or decreased. The length of the optical fiber is generally 4 to 6 kilometers, and the length can be changed according to the specific monitoring requirements of the coal mine. The light from the light source system is connected to the sensing fibe...

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Abstract

The invention discloses a mine safety early warning system based on multi-fiber-core optical fibers. By means of the mine safety early warning system, the downhole temperature, strain and vibration are measured at the same time. Different fiber cores in one multi-fiber-core optical fiber are adopted to sense the temperature, the strain, the vibration and other physical quantities, and distributed real-time measurement of all the physical quantities is achieved through a multi-fiber-core beam splitter. According to the mine safety early warning system, the healthy condition of a coal mine downhole can be comprehensively evaluated in a multi-sensor fusion mode through one optical fiber, the optical cable installation cost is greatly saved, meanwhile only less bandwidth of a communication optical cable is occupied, and the mine safety early warning system is suitable for the monitoring requirement in a severe environment.

Description

technical field [0001] The invention relates to a system for full-fiber monitoring of coal mine safety by using multi-fiber-core optical fibers, which is used for real-time monitoring underground and alarming. Background technique [0002] Coal mine safety plays a vital role in the national economy. In recent years, safety accidents related to coal mines have emerged one after another, seriously affecting the interests of the country and the people, and bringing many negative social impacts. Therefore, it is very necessary to carry out all-round safety monitoring in coal mining area, especially underground. The environment in the coal mining area is complex, and the requirements for electromagnetic explosion protection are extremely high. Ordinary electrical sensors cannot meet the monitoring requirements. Using optical sensing to safely monitor the underground gas concentration, temperature change and other information can not be affected by electromagnetic interference, ...

Claims

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Application Information

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IPC IPC(8): E21F17/18
CPCE21F17/18
Inventor 李俊董凤忠孙苗汤玉泉杨爽
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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