CN114354546B - Mine gas concentration detection system based on optical fiber sensing - Google Patents
Mine gas concentration detection system based on optical fiber sensing Download PDFInfo
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- CN114354546B CN114354546B CN202111668577.6A CN202111668577A CN114354546B CN 114354546 B CN114354546 B CN 114354546B CN 202111668577 A CN202111668577 A CN 202111668577A CN 114354546 B CN114354546 B CN 114354546B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 58
- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 8
- 230000008878 coupling Effects 0.000 claims description 35
- 238000010168 coupling process Methods 0.000 claims description 35
- 238000005859 coupling reaction Methods 0.000 claims description 35
- 238000009423 ventilation Methods 0.000 claims description 14
- 239000000835 fiber Substances 0.000 claims description 6
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 4
- 239000003063 flame retardant Substances 0.000 claims description 4
- 238000005253 cladding Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000002265 prevention Effects 0.000 abstract description 12
- 238000004880 explosion Methods 0.000 abstract description 7
- 239000000428 dust Substances 0.000 abstract description 5
- 239000003245 coal Substances 0.000 description 7
- 230000007774 longterm Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a mine gas concentration detection system based on optical fiber sensing, which comprises an optical fiber, a light source device, a signal processing device, a plurality of grating sensing devices connected in series on the optical fiber, wherein the grating sensing devices comprise a base, an optical coupler, a Bragg grating sensor, an optical fiber elastic sheath and an explosion-proof sheath. The mine gas concentration detection system based on optical fiber sensing utilizes the plurality of grating sensing devices arranged along the roadway to detect the gas concentration, can master the gas concentration condition in the whole area of the mine roadway, has good functions of dust prevention, explosion impact prevention, fire prevention and high temperature prevention, and can ensure that the optical fiber Bragg grating sensor works stably for a long time in the complex environment of the mine.
Description
Technical Field
The invention relates to the technical field of mine disaster detection, in particular to a system for detecting mine gas concentration.
Background
Coal is an important strategic energy source, and as the high-quality shallow buried coal seam is completely exploited in coal mining, the coal mining enters the deep part, and the frequency of coal mine disasters is increased. The gas disaster is a main disaster of the coal mine, the post-disaster effect of the disaster causes the communication paralysis and the power interruption in the underground, and the gas concentration monitoring system taking the current inductive and point type monitoring as the main body loses the monitoring function due to the power interruption and cannot obtain the underground gas concentration distribution condition.
In the prior art, although the research of measuring the gas concentration by using the fiber bragg grating is available, the underground environment of the coal mine has much dust, the gas explosion can generate strong impact, and the long-term stable operation of the fiber bragg grating sensor in the underground severe environment is a technical problem.
Disclosure of Invention
Therefore, the invention aims to provide a mine gas concentration detection system based on optical fiber sensing, so as to solve the technical problems of underground gas concentration detection and ensuring long-term stable operation of an optical fiber Bragg grating.
The mine gas concentration detection system based on optical fiber sensing comprises an optical fiber, a light source device for emitting detection light pulses to the optical fiber, and a signal processing device for processing reflected light signals transmitted back by the optical fiber, wherein the mine gas concentration detection system based on optical fiber sensing also comprises a plurality of grating sensing devices connected in series on the optical fiber, and each grating sensing device comprises a base, an optical coupler, a Bragg grating sensor, an optical fiber elastic sheath and an explosion-proof shield;
the base is fixed on the roadway wall;
the optical coupler comprises a coupling seat fixed on a base, a coupling cover fixed on the coupling seat through a screw and a positioning pin for positioning the coupling seat and the coupling cover, wherein the coupling seat and the coupling cover are respectively provided with a left circular arc groove, a middle circular arc groove and a right circular arc groove which are coaxially arranged, the coupling seat and the coupling cover are also respectively provided with a ventilation slot hole, the ventilation slot holes are positioned between the middle circular arc groove and the left circular arc groove and between the middle circular arc groove and the right circular arc groove, and the optical coupler further comprises a dustproof ventilation layer which is shielded on the ventilation slot holes;
the Bragg grating sensor is arranged in the middle circular arc groove, and the end parts of the optical fibers which are optically connected with the two ends of the Bragg grating sensor are respectively arranged in the left circular arc groove and the right circular arc groove;
the two ends of the base are provided with convex blocks for fixing the optical fiber elastic sheath, and the end parts of the optical fibers which are optically connected with the two ends of the Bragg grating sensor respectively penetrate through the optical fiber elastic sheath and then are inserted into the left circular arc groove and the right circular arc groove;
the explosion-proof shield is fixed on the base, covers the optical coupler, and has U-shaped grooves clamped on the optical fiber elastic sheath at two ends.
Further, the cladding of the optical fiber is made of a high-temperature resistant and flame retardant material.
The invention has the beneficial effects that:
1. the mine gas concentration detection system based on optical fiber sensing utilizes a plurality of grating sensing devices arranged along the roadway to detect the gas concentration, and can master the gas concentration condition in the whole area of the mine roadway.
2. The optical fiber sensing-based mine gas concentration detection system has the advantages that the grating sensing device has good functions of dust prevention, explosion impact prevention, fire prevention and high temperature prevention, and long-term stable operation of the optical fiber Bragg grating sensor in a complex mine environment can be ensured.
Drawings
FIG. 1 is a schematic diagram of a mine gas concentration detection system based on optical fiber sensing;
FIG. 2 is a schematic perspective view of a grating sensor device;
FIG. 3 is a schematic perspective view of the coupling base disposed on the base;
FIG. 4 is a schematic perspective view of a Bragg grating sensor with an optical fiber end disposed in an optical coupler;
FIG. 5 is a schematic perspective view of the coupling cover attached to the coupling seat by screws;
fig. 6 is a schematic perspective view of a dust-proof air-permeable layer disposed on an optical coupler.
Detailed Description
The mine gas concentration detection system based on optical fiber sensing in the embodiment comprises an optical fiber 1 arranged along a mine roadway, a light source device 2 for emitting detection light pulses to the optical fiber, and a signal processing device 3 for processing reflected light signals returned by the optical fiber, wherein the signal processing device 3 is specifically an FBG fiber grating demodulation instrument in the embodiment. The mine gas concentration detection system based on optical fiber sensing in the embodiment further comprises a plurality of grating sensing devices 4 connected in series on the optical fibers, wherein each grating sensing device comprises a base 41, an optical coupler, a Bragg grating sensor 42, an optical fiber elastic sheath 43 and an explosion-proof shield 44.
The base is fixed on the roadway wall through an anchor bolt 5.
The optical coupler comprises a coupling seat 45 fixed on the base, a coupling cover 46 fixed on the coupling seat through screws and a positioning pin 47 for positioning the coupling seat and the coupling cover, wherein the coupling seat and the coupling cover are respectively provided with a left circular arc groove 48, a middle circular arc groove 49 and a right circular arc groove 410 which are coaxially arranged, the coupling seat and the coupling cover are respectively provided with a ventilation slot 411, the ventilation slot is positioned between the middle circular arc groove and the left circular arc groove and between the middle circular arc groove and the right circular arc groove, and the optical coupler further comprises a dustproof ventilation layer 412 which is shielded on the ventilation slot. In the concrete implementation, the dustproof breathable layer can be made of flame-retardant cloth with ventilation holes, and can be fixed on the coupling seat and the coupling cover in a mode of screw connection, bonding and the like, so that the performance of the Bragg grating sensor can be prevented from being influenced by dust through the dustproof breathable layer, and the reliability of long-term working of the Bragg grating sensor is ensured.
The Bragg grating sensor is arranged in the middle circular arc groove, and the end parts of the optical fibers which are optically connected with the two ends of the Bragg grating sensor are respectively arranged in the left circular arc groove and the right circular arc groove. The optical coupler is characterized in that the end parts of the Bragg grating sensor and the optical fiber are clamped and fixed through the coupling seat and the coupling cover of the optical coupler, so that reliable coupling of an optical path can be ensured.
The Bragg grating sensor and the dustproof ventilation layer in the embodiment can be conveniently replaced, and the maintenance is convenient.
The two ends of the base are provided with convex blocks for fixing the optical fiber elastic sheath, and the end parts of the optical fibers which are optically connected with the two ends of the Bragg grating sensor respectively penetrate through the optical fiber elastic sheath and then are inserted into the left circular arc groove and the right circular arc groove. The optical fiber end is protected through the optical fiber elastic sheath, and the optical fiber elastic sheath can protect the optical fiber from being broken and damaged when being subjected to explosion impact due to supporting and damping effects.
The explosion-proof shield is fixed on the base, covers the optical coupler, and has U-shaped grooves clamped on the optical fiber elastic sheath at two ends. The U-shaped groove also serves as an air inlet, so that the Bragg grating sensor can detect the change of the concentration of gas in the air. Of course, in the implementation, an air inlet can also be separately arranged on the explosion-proof shield. The explosion-proof shield can prevent the explosion from generating airflow impact to damage the optical coupler inside.
As an improvement on the embodiment, the cladding of the optical fiber is made of a high-temperature resistant flame-retardant material, and the improvement can prevent the optical fiber from being burnt by high-temperature gas under the condition of gas explosion of a mine.
The mine gas concentration detection system based on optical fiber sensing in the embodiment utilizes a plurality of grating sensing devices arranged along a roadway to detect gas concentration, so that the condition of gas concentration in the whole area of the mine roadway can be mastered. And the grating sensing device in the embodiment has good functions of dust prevention, explosion impact prevention, fire prevention and high temperature prevention, and can ensure that the grating sensing device works stably for a long time in a complex mine environment.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (1)
1. The utility model provides a mine gas concentration detecting system based on optical fiber sensing, includes the optic fibre that arranges along mine tunnel, to the light source device of optic fibre emission detection light pulse and the signal processing device who carries out processing to the reflected light signal that optic fibre returned, its characterized in that: the optical fiber explosion-proof device also comprises a plurality of grating sensing devices connected in series on the optical fiber, wherein each grating sensing device comprises a base, an optical coupler, a Bragg grating sensor, an optical fiber elastic sheath and an explosion-proof sheath;
the base is fixed on the roadway wall;
the optical coupler comprises a coupling seat fixed on a base, a coupling cover fixed on the coupling seat through a screw and a positioning pin for positioning the coupling seat and the coupling cover, wherein the coupling seat and the coupling cover are respectively provided with a left circular arc groove, a middle circular arc groove and a right circular arc groove which are coaxially arranged, the coupling seat and the coupling cover are also respectively provided with a ventilation slot hole, the ventilation slot holes are positioned between the middle circular arc groove and the left circular arc groove and between the middle circular arc groove and the right circular arc groove, and the optical coupler further comprises a dustproof ventilation layer which is shielded on the ventilation slot holes;
the Bragg grating sensor is arranged in the middle circular arc groove, and the end parts of the optical fibers which are optically connected with the two ends of the Bragg grating sensor are respectively arranged in the left circular arc groove and the right circular arc groove;
the two ends of the base are provided with convex blocks for fixing the optical fiber elastic sheath, and the end parts of the optical fibers which are optically connected with the two ends of the Bragg grating sensor respectively penetrate through the optical fiber elastic sheath and then are inserted into the left circular arc groove and the right circular arc groove;
the explosion-proof shield is fixed on the base, covers the optical coupler, and is provided with U-shaped grooves clamped on the optical fiber elastic sheath at two ends;
the cladding of the optical fiber is made of high-temperature-resistant flame-retardant material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111668577.6A CN114354546B (en) | 2021-12-31 | 2021-12-31 | Mine gas concentration detection system based on optical fiber sensing |
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| CN202111668577.6A CN114354546B (en) | 2021-12-31 | 2021-12-31 | Mine gas concentration detection system based on optical fiber sensing |
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| CN114354546A CN114354546A (en) | 2022-04-15 |
| CN114354546B true CN114354546B (en) | 2024-03-22 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200409223Y1 (en) * | 2005-12-05 | 2006-02-22 | 신화전자주식회사 | Connection Device of Fiber Optic Sensor for Fire Detection |
| CN1766570A (en) * | 2005-11-22 | 2006-05-03 | 重庆工学院 | Distributed microstructure optical fiber gas sensing system and sensing method |
| CN1940532A (en) * | 2006-09-25 | 2007-04-04 | 重庆工学院 | Microcavity double-grating and optical-fiber gas sensing system and method |
| CN101126711A (en) * | 2006-07-27 | 2008-02-20 | 山东省科学院激光研究所 | High-performance optical fiber gas sensor |
| CN105987885A (en) * | 2016-01-06 | 2016-10-05 | 山东省科学院激光研究所 | Fiber grating-based quasi-distributed gas sensing system |
| CN106290253A (en) * | 2016-11-02 | 2017-01-04 | 中国计量大学 | A kind of optical-fiber type sensor measuring relative humidity in air |
| CN107165677A (en) * | 2017-07-11 | 2017-09-15 | 中国矿业大学 | A kind of fiber grating monitoring system method for arranging for mine gas drainage |
| CN109668860A (en) * | 2018-12-10 | 2019-04-23 | 中国计量大学 | Long-period fiber grating hydrogen detector based on Mach-Zender interferometer |
| CN111812060A (en) * | 2020-06-19 | 2020-10-23 | 中国矿业大学 | Methane concentration detection system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8280202B2 (en) * | 2009-05-14 | 2012-10-02 | General Electric Company | Fiber-optic dynamic sensing modules and methods |
-
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- 2021-12-31 CN CN202111668577.6A patent/CN114354546B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1766570A (en) * | 2005-11-22 | 2006-05-03 | 重庆工学院 | Distributed microstructure optical fiber gas sensing system and sensing method |
| KR200409223Y1 (en) * | 2005-12-05 | 2006-02-22 | 신화전자주식회사 | Connection Device of Fiber Optic Sensor for Fire Detection |
| CN101126711A (en) * | 2006-07-27 | 2008-02-20 | 山东省科学院激光研究所 | High-performance optical fiber gas sensor |
| CN1940532A (en) * | 2006-09-25 | 2007-04-04 | 重庆工学院 | Microcavity double-grating and optical-fiber gas sensing system and method |
| CN105987885A (en) * | 2016-01-06 | 2016-10-05 | 山东省科学院激光研究所 | Fiber grating-based quasi-distributed gas sensing system |
| CN106290253A (en) * | 2016-11-02 | 2017-01-04 | 中国计量大学 | A kind of optical-fiber type sensor measuring relative humidity in air |
| CN107165677A (en) * | 2017-07-11 | 2017-09-15 | 中国矿业大学 | A kind of fiber grating monitoring system method for arranging for mine gas drainage |
| CN109668860A (en) * | 2018-12-10 | 2019-04-23 | 中国计量大学 | Long-period fiber grating hydrogen detector based on Mach-Zender interferometer |
| CN111812060A (en) * | 2020-06-19 | 2020-10-23 | 中国矿业大学 | Methane concentration detection system |
Non-Patent Citations (1)
| Title |
|---|
| 光纤光栅温度监测系统在矿井下的应用;韩超仲;周海燕;种越;谢庆博;;电脑知识与技术(第36期);全文 * |
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