CN104454007A - Mine safety early warning system based on multi-fiber-core optical fibers - Google Patents
Mine safety early warning system based on multi-fiber-core optical fibers Download PDFInfo
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- CN104454007A CN104454007A CN201410564044.7A CN201410564044A CN104454007A CN 104454007 A CN104454007 A CN 104454007A CN 201410564044 A CN201410564044 A CN 201410564044A CN 104454007 A CN104454007 A CN 104454007A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 33
- 239000000835 fiber Substances 0.000 claims abstract description 113
- 238000012544 monitoring process Methods 0.000 claims abstract description 41
- 239000003245 coal Substances 0.000 claims abstract description 36
- 230000003287 optical effect Effects 0.000 claims abstract description 30
- 238000005259 measurement Methods 0.000 claims abstract description 12
- 238000004891 communication Methods 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims description 11
- 230000008447 perception Effects 0.000 claims description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000005065 mining Methods 0.000 claims description 4
- 238000005530 etching Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000004927 fusion Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000002411 adverse Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009897 systematic effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000003862 health status Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000010117 shenhua Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
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
The present invention relates to a kind of multicore fiber that adopts and the system of all-fiber monitoring is carried out to safety of coal mines, report to the police for Real-Time Monitoring down-hole.
Background technology
Safety of coal mines life plays vital effect to national economy.Security incident relevant with colliery in recent years emerges in an endless stream, and badly influences the interests of the country and people, brings a lot of negative social to affect.Therefore, omnibearing safety monitoring is carried out to coal field, particularly down-hole very necessary.Bank circumstance complication, high to electromagnetism requirement of explosion proof, common electrical sensor cannot adapt to monitoring requirements.Adopt the means of optical sensing to fire damp concentration, the information such as variations in temperature situation carry out safety monitoring can accomplish that essential safety, is easy to networking, is applicable to the safety monitoring demand of coal industry not by electromagnetic interference influence.
Traditional optical monitoring means generally adopt the mode of point type sensing to measure in real time down-hole important physical amount.Existing utility model patent CN201320347593 proposes a kind of coal mine gas gas safety monitoring system based on optical fiber sensing technology, achieve the real time on-line monitoring of coal mine gas, there is higher precision, stability in use and higher safety factor, decrease dust and the moist impact on probe, and can automatic calibration.Shenhua Group Co proposes a kind of coal mine gob temperature monitoring system (application number: 201320477685.X).By guiding erecting device, the back production of hydraulic support is moved synchronously to carry out with the laying of goaf sensor fibre, utilize optical fiber temperature sensor technology Real-Time Monitoring goaf temperature, achieve the remote real time monitoring of the temperature to goaf.But Distributed Optical Fiber Sensing Techniques does not possess measuring tempeature simultaneously, the ability of the important physical amount that the down-holes such as strain and vibration are paid close attention to.Generally need multifiber to measure different physical quantitys respectively, virtually occupy the more fiber resources in optical cable, increase construction cost simultaneously.Multicore fiber is one of focus of academic research in recent years, is applied to Large Copacity optic communication of future generation, is significant for raising optic communication transmission bandwidth.Application on Fibre Optical Sensor is not also a lot of at present, and the people such as Edinburgh, Britain Univ Heriot Watt W.N.Macpherson etch fiber grating in multicore fiber, and successfully produce the multi-shaft acceleration transducer for adverse circumstances.Actually rare at the engineer applied of China's multicore fiber sensing.
Above technology and patent all fail to realize an optical fiber carries out Distributed Integration measurement simultaneously demand to multi-parameter, and based on this, the present invention proposes a kind of multicore fiber sensing technology and measures downhole temperature, strain, vibration simultaneously.Adopt fibre core perception different in a multicore fiber to physical quantitys such as temperature, strain and vibrations, realized the distributed real-time measurement of each physical quantity by many fibre cores beam splitter.Adopt the mode overall merit underground coal mine health status of an optical fiber and available Multi-sensor Fusion, greatly save fiber cable laying cost, only take the less bandwidth of communications optical cable simultaneously, be applicable to the detection requirement of adverse circumstances.
Summary of the invention
The technology of the present invention is dealt with problems: the deficiency taking more telecommunication optical fiber resource when overcoming the monitoring of prior art many reference amounts, a kind of coal mine safety prewarning system based on multicore fiber is provided, many physical parameters needed for mine monitoring are measured in real time with same sensor fibre, greatly improves the stability of measurement accuracy and system; Multicore fiber Coal Mine Safety Monitoring System can realize a fiber-optic monitoring simultaneously, greatly saves testing cost.
The technology of the present invention solution: a kind of based on multicore fiber coal mine safety prewarning system, comprising: for the multicore fiber of sensing, for connecting the multicore fiber beam splitter of sensor fibre and Transmission Fibers, light source module and demodulation module; Adopt similar and different light source module, by multicore fiber beam splitter, optically-coupled is entered multicore fiber, multicore fiber beam splitter is connected to sensor fibre; Sensor fibre, through coat and oversheath protection, is applied to coal field monitored area with the form of optical cable; When optical cable physical parameter along the line in mine monitoring district changes, the optical cable that the distortion in coal seam, optical cable place causes strains, micro-vibration of mining face under mine all by optical fiber perception, and by utilizing emitted light pulse with receive light pulse situation location physical quantity variation position; Finally, the physical quantity of the different fibre core collections of multicore fiber is sent to the different demodulating systems that design by many reference amounts information Real-time demodulation and SCN Space Cable Network transmission system by multi-core fiber beam splitter.
Described multicore fiber beam splitter adopts hydrofluoric acid by the method for many standard single-mode fibers of diameter 125 μm by etching, reaches the identical diameter of multicore fiber and is that is coupled after 125 μm, transmission light wave.
The interlude of the described multicore fiber for sensing draws through same preform when stranding and forms, homogenize material, Heat stability is good, compares have higher certainty of measurement and better stability with employing multifiber sensing.
The interlude of the described multicore fiber for sensing is divided into the standard single-mode fiber of 3 core 4 cores or more fibre core, and each fibre core monitors a physical quantity, and according to the number of the physical quantity of required monitoring, fiber cores changeable, does not take existing Coal Mine Communication resource.The length of optical fiber generally at 4 to 6 kilometers, according to the concrete monitoring requirements variable-length of underground coal mine.
Variations in temperature, the ore deposit at coal field monitoring point place shake, ore body structural strain event all can carry out real-time distributed measurement by sensing section multicore fiber.
The present invention's advantage is compared with prior art:
(1) Distributed Optical Fiber Sensing Techniques that the present invention is different from the past needs by optical fiber measurement physical quantity, replace, the present invention adopts the different fibre cores in an optical fiber can realize the distributed of multi-parameter or point measurement, according to sensing demand, combines flexible and changeable.Each fibre core in an optical fiber can measure a physical quantity, and locates the change location of this physical quantity on fiber lengths.In time monitoring physical quantity demand and be many, only need the number increasing fibre core when prepared by optical fiber can realize the distributed real-time measurement of multi-parameter.
(2) optical fiber structure adopting the present invention to propose carries out colliery measuring multiple parameters, and sensor information is all in an optical fiber, affected by environment little, at utmost avoids systematic error.
(3) the different fibre cores in same optical fiber can complete the distributed measurement of different monitoring variable, according to monitoring requirements, only need change light source and demodulating system, can change the physical quantity needing monitoring, flexibly and easily.
(4) integral sensors adopts an optical fiber to do transmission sensing medium, adopts less communication bandwidth to complete monitoring requirements, reduces cost and the complexity of fiber cable laying, has saved communication bandwidth.
Accompanying drawing explanation
Fig. 1 multicore fiber sensor-based system schematic diagram;
The multicore fiber end face shown under Fig. 2 microscope;
Fig. 3 underground optical cable lays schematic diagram;
Fig. 4 multicore fiber temperature-measuring results schematic diagram.
Detailed description of the invention
As shown in Figure 1, the present invention includes: multicore fiber, multicore fiber beam splitter, light source module and demodulation module; Adopt similar and different light source module, by multicore fiber beam splitter, optically-coupled is entered multicore fiber, multicore fiber beam splitter send demodulating system demodulation by needing the different physical quantities of monitoring.
The overall structure figure of system as shown in Figure 2.Interlude fiber section can be the standard single-mode fiber of 3 core 4 cores or more fibre core, according to the number of the physical quantity of required monitoring, and fiber cores changeable.The length of optical fiber generally at 4 to 6 kilometers, according to the concrete monitoring requirements variable-length of underground coal mine.The light of light-source system is connected to sensor fibre through too much fibre core beam splitter.Sensor fibre, through coat and oversheath protection, is applied to coal field monitored area with the form of optical cable.When optical cable physical parameter along the line in mine monitoring district changes, as the change of temperature, the optical cable that the distortion in coal seam, optical cable place causes strains, micro-vibration of mining face under mine etc. all can by optical fiber perception, and can locate the position of physical quantity variation by utilizing emitted light pulse with the situation receiving light pulse.Here the advantage adopting multi-core fiber to compare traditional distributed Fibre Optical Sensor is, all physical quantitys needing to measure can realize with an optical fiber distributed monitoring does not exist cross sensitivity simultaneously problem between each physical quantity.Sensing arrangement is compact, and integrated level is high, is conducive to improving the precision detected, and reduces systematic error.In addition, because underground construction is complicated, only adopt an optical fiber to be conducive to reducing difficulty of construction, raise the efficiency.Finally, the physical quantity of the different fibre core collections of multicore fiber is sent to the different demodulating systems that design by many reference amounts information Real-time demodulation and SCN Space Cable Network transmission system by multi-core fiber beam splitter.
Be illustrated in figure 3 a specific embodiments of the present invention: the interlude for sensor fibre is 4 core standard single-mode fibers, according to the number of the physical quantity of required monitoring, fiber cores changeable.Here, the cable length laid in goaf is 5 kilometers, according to the concrete monitoring requirements variable-length of underground coal mine.
The light that the light-pulse generator of 50ns sends is connected to sensor fibre with certain repetition rate through too much fibre core beam splitter.Sensor fibre, through coat and oversheath protection, is applied to coal field monitored area with the form of optical cable.When optical cable physical parameter along the line in mine monitoring district changes, as the change of temperature, the optical cable that the distortion in coal seam, optical cable place causes strains, micro-vibration of mining face under mine etc. all can by optical fiber perception, and can locate the position of physical quantity variation by utilizing emitted light pulse with the situation receiving light pulse.As shown in Figure 4, after carrying out heating constant temperature to 1100 meters to 1250 meters optical cables, utilize distributed satellite systems principle to record this place's temperature value is 85 DEG C to a typical temperature measurement result figure.If when the temperature in optical cable district and strain change, measured while same principle is applicable to the physical quantity such as temperature and strain simultaneously.Light phase in the different fibre cores of same optical cable place optical fiber will be subject to the modulation of temperature and strain respectively, and this signal is by the different fibre cores transmission in same optical fiber, and many fibre cores beam splitter can be sent into different demodulating system demodulation.Thus reduction measured parameter information locating., similar serpentine configuration can be adopted to carry out fiber cable laying to underground goaf here, this system of laying contributes to the situation of more comprehensively reacting goaf, is convenient to monitor the spontaneous fire that goaf causes due to the unexpected rising of coal seam temperature.Whole goaf needs monitoring length to be 1 kilometer, and cable length can increase to 4 to 6 kilometers.Fig. 4 is the distributed temperature monitoring experimental result picture that the core in a typical multicore fiber carries out.The optical fiber of 1000 to 1250 segment length 250 meters is placed in insulating box, and this portion temperature measured value is 80 DEG C.
Here the advantage adopting multi-core fiber to compare traditional distributed Fibre Optical Sensor is, all physical quantitys needing to measure can realize with an optical fiber distributed monitoring does not exist cross sensitivity simultaneously problem between each physical quantity.Sensing arrangement is compact, and integrated level is high, is conducive to improving the precision detected, and reduces systematic error.In addition, because underground construction is complicated, only adopt an optical fiber to be conducive to reducing difficulty of construction, raise the efficiency.Finally, the physical quantity of the different fibre core collections of multicore fiber is sent to the different demodulating systems that design by many reference amounts information Real-time demodulation and SCN Space Cable Network transmission system by multi-core fiber beam splitter.
In a word, the present invention adopts the mode overall merit underground coal mine health status of an optical fiber and available Multi-sensor Fusion, greatly saves fiber cable laying cost, only takies the less bandwidth of communications optical cable simultaneously, is applicable to the detection requirement of adverse circumstances.
Claims (5)
1. based on a coal mine safety prewarning system for multicore fiber, it is characterized in that comprising: for the multicore fiber of sensing, for connecting the multicore fiber beam splitter of sensor fibre and Transmission Fibers, light source module and demodulation module; Adopt similar and different light source module, by multicore fiber beam splitter, optically-coupled is entered multicore fiber, multicore fiber beam splitter is connected to sensor fibre; Sensor fibre, through coat and oversheath protection, is applied to coal field monitored area with the form of optical cable; When optical cable physical parameter along the line in mine monitoring district changes, the optical cable that the distortion in coal seam, optical cable place causes strains, micro-vibration of mining face under mine all by optical fiber perception, and by utilizing emitted light pulse with receive light pulse situation location physical quantity variation position; Finally, the physical quantity of the different fibre core collections of multicore fiber is sent to the different demodulating systems that design by many reference amounts information Real-time demodulation and SCN Space Cable Network transmission system by multi-core fiber beam splitter.
2. the coal mine safety prewarning system based on multicore fiber according to claim 1, it is characterized in that: described multicore fiber beam splitter adopts hydrofluoric acid by the method for many standard single-mode fibers of diameter 125 μm by etching, reach the identical diameter of multicore fiber to be that is coupled after 125 μm, transmission light wave.
3. the coal mine safety prewarning system based on multicore fiber according to claim 1, it is characterized in that: the interlude of the described multicore fiber for sensing draws through same preform when stranding and forms, homogenize material, Heat stability is good, compares with employing multifiber sensing and has higher certainty of measurement and better stability.
4. the coal mine safety prewarning system based on multicore fiber according to claim 1, it is characterized in that: the interlude of the described multicore fiber for sensing is divided into the standard single-mode fiber of 3 core 4 cores or more fibre core, each fibre core monitors a physical quantity, according to the number of the physical quantity of required monitoring, fiber cores changeable, does not take existing Coal Mine Communication resource; The length range of multicore fiber is 4 to 6 kilometers, according to the concrete monitoring requirements variable-length of underground coal mine.
5. the coal mine safety prewarning system based on multicore fiber according to claim 1, is characterized in that: variations in temperature, the ore deposit at coal field monitoring point place shake, ore body structural strain event all can carry out real-time distributed measurement by sensing section multicore fiber.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107452177A (en) * | 2017-04-14 | 2017-12-08 | 浙江省邮电工程建设有限公司 | A kind of communications optical cable safety pre-warning system |
| CN108534910A (en) * | 2018-03-19 | 2018-09-14 | 浙江师范大学 | A kind of distributed dual sampling method based on Asymmetric Twin-Core Fiber |
| CN109029832A (en) * | 2018-06-29 | 2018-12-18 | 中国矿业大学 | A method of aquifer water pressure is adopted based on the monitoring of incorporated light fiber sensor |
| CN109901272A (en) * | 2019-04-15 | 2019-06-18 | 武汉地震工程研究院有限公司 | A kind of multi-core optical fiber Intelligent Composite muscle, preparation method and safety monitoring method |
| CN109958056A (en) * | 2019-04-15 | 2019-07-02 | 武汉地震工程研究院有限公司 | Smart stay cable, smart stay cable preparation method and smart stay cable safe condition detection method |
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| CN110388948A (en) * | 2019-08-05 | 2019-10-29 | 长飞光纤光缆股份有限公司 | Distributed temperature, vibration while detection sensor based on multi-core optical fiber |
| CN110440838A (en) * | 2019-08-19 | 2019-11-12 | 武汉地震工程研究院有限公司 | A kind of many reference amounts Fibre Optical Sensor instrument and method for sensing based on multi-core optical fiber |
| CN110440837A (en) * | 2019-08-19 | 2019-11-12 | 武汉地震工程研究院有限公司 | A kind of synchronous sensing acquisition instrument of many reference amounts optical fiber and sensing acquisition method |
| CN112945123A (en) * | 2021-02-20 | 2021-06-11 | 深圳市沛元科技有限公司 | Double-grating rail surface appearance monitoring sensor |
| CN114826389A (en) * | 2022-04-27 | 2022-07-29 | 浙江广联有线电视传输中心 | Optical cable line security level evaluation method and evaluation system thereof |
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| CN107452177B (en) * | 2017-04-14 | 2023-05-23 | 浙江省邮电工程建设有限公司 | Communication optical cable safety precaution system |
| CN107452177A (en) * | 2017-04-14 | 2017-12-08 | 浙江省邮电工程建设有限公司 | A kind of communications optical cable safety pre-warning system |
| CN108534910A (en) * | 2018-03-19 | 2018-09-14 | 浙江师范大学 | A kind of distributed dual sampling method based on Asymmetric Twin-Core Fiber |
| CN109029832A (en) * | 2018-06-29 | 2018-12-18 | 中国矿业大学 | A method of aquifer water pressure is adopted based on the monitoring of incorporated light fiber sensor |
| CN109901272A (en) * | 2019-04-15 | 2019-06-18 | 武汉地震工程研究院有限公司 | A kind of multi-core optical fiber Intelligent Composite muscle, preparation method and safety monitoring method |
| CN109958056A (en) * | 2019-04-15 | 2019-07-02 | 武汉地震工程研究院有限公司 | Smart stay cable, smart stay cable preparation method and smart stay cable safe condition detection method |
| CN110007392A (en) * | 2019-04-15 | 2019-07-12 | 武汉地震工程研究院有限公司 | A kind of intelligent fiber plate of compound multi-core optical fiber and preparation method thereof |
| CN109901272B (en) * | 2019-04-15 | 2024-07-02 | 武汉地震工程研究院有限公司 | Multi-core optical fiber intelligent composite rib, preparation method and safety monitoring method |
| CN110388948A (en) * | 2019-08-05 | 2019-10-29 | 长飞光纤光缆股份有限公司 | Distributed temperature, vibration while detection sensor based on multi-core optical fiber |
| CN110440837A (en) * | 2019-08-19 | 2019-11-12 | 武汉地震工程研究院有限公司 | A kind of synchronous sensing acquisition instrument of many reference amounts optical fiber and sensing acquisition method |
| CN110440838A (en) * | 2019-08-19 | 2019-11-12 | 武汉地震工程研究院有限公司 | A kind of many reference amounts Fibre Optical Sensor instrument and method for sensing based on multi-core optical fiber |
| CN112945123A (en) * | 2021-02-20 | 2021-06-11 | 深圳市沛元科技有限公司 | Double-grating rail surface appearance monitoring sensor |
| CN114826389A (en) * | 2022-04-27 | 2022-07-29 | 浙江广联有线电视传输中心 | Optical cable line security level evaluation method and evaluation system thereof |
| CN114826389B (en) * | 2022-04-27 | 2024-04-19 | 浙江广联有线电视传输中心 | Optical cable line safety level assessment method and assessment system thereof |
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