CN103362552B - Distributed optical fiber grating anchor rod group stress monitoring system for coal mine roadway - Google Patents

Distributed optical fiber grating anchor rod group stress monitoring system for coal mine roadway Download PDF

Info

Publication number
CN103362552B
CN103362552B CN201310264029.6A CN201310264029A CN103362552B CN 103362552 B CN103362552 B CN 103362552B CN 201310264029 A CN201310264029 A CN 201310264029A CN 103362552 B CN103362552 B CN 103362552B
Authority
CN
China
Prior art keywords
fiber grating
stress monitoring
coal mine
monitoring
subsystem
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201310264029.6A
Other languages
Chinese (zh)
Other versions
CN103362552A (en
Inventor
方新秋
梁敏富
刘晓宁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China University of Mining and Technology CUMT
Original Assignee
China University of Mining and Technology CUMT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China University of Mining and Technology CUMT filed Critical China University of Mining and Technology CUMT
Priority to CN201310264029.6A priority Critical patent/CN103362552B/en
Publication of CN103362552A publication Critical patent/CN103362552A/en
Application granted granted Critical
Publication of CN103362552B publication Critical patent/CN103362552B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention discloses a distributed optical fiber grating anchor rod group stress monitoring system for a coal mine roadway, and belongs to anchor rod group stress monitoring systems for coal mine roadways. Each of a mining roadway anchor rod support stress monitoring subsystem, an excavation roadway anchor rod support stress monitoring subsystem and a working face open-off cut anchor rod support stress monitoring subsystem comprises one or more monitoring substations; the communication optical fibers of the three subsystems are connected with a mineral transmission optical cable through an optical fiber connecting box; the mineral transmission optical cable is connected with an input port of an optical fiber grating static demodulator; an output port of the optical fiber grating static demodulator is connected with a computer data processing system; processed monitoring data is shared with a ground computer through a server and a coal mine local area network, so that the online real-time anchor rod group stress monitoring system for the coal mine roadway is formed. An anchor rod group stress monitoring network taking anchor rods as sensing media and optical fibers as transmission carriers adopts a tandem structure; the anchor group stress is measured in a distributed way; the mounting operation is convenient; the labor, the time and the effort are saved; the monitoring expense is reduced.

Description

A kind of coal mine roadway distributed fiber grating Bolt Groups stress monitoring system
Technical field
The present invention relates to a kind of coal mine roadway Bolt Groups stress monitoring system, especially a kind of coal mine roadway distributed fiber grating Bolt Groups stress monitoring system.
Background technology:
In recent years, along with improving constantly of mining technique, China's coal-mine industry obtains better developing faster.As the basis of China's other industrial trades development, the raising of safety in production to social progress and national economy in colliery plays very important effect.But, along with the continuous increase of coal mining depth, the strata behaviors in colliery is more obvious, the disaster caused is also more and more serious, as the accidents such as roof collapse, roadway deformation, impulsion pressure frequently occur, become the key factor affecting Safety of Coal Mine Production, the production safety in colliery and the life security of practitioner in serious threat.In order to ensure the stable of the rear country rock of coal mine roadway excavation, prevent country rock large area caving or produce excessive deformation and affect Safety of Coal Mine Production, carry out after generally taking tunnelling supporting measure immediately in existing colliery; In recent years, anchor pole is as the main tool of roadway support, more and more extensive in the application of mining engineering field, is also given sufficient attention monitoring stressed in bolt support process.
Bolt support belongs to disguised engineering, and the bad roof caving, two that just may cause of supporting effect helps the generation of the roadway surrounding rock disaster such as slabbing, working face open-off cut eye.Therefore, bolt support construction after, must to rockbolt stress distribution and size is carried out comprehensively, the monitoring of system, judge degree of stability and the safety of roadway surrounding rock.At present, rockbolt stress monitoring is all carried out single anchor rod, monitoring means mostly is resistance-strain chip force-measuring anchor stock, fluid pressure type rock bolt extensometer, although size and the distribution of rockbolt stress can be measured, the coupled relation between adjacent Bolt Groups and country rock can not be reflected, moreover adopt artificial continued observations and collection, monitoring result is delayed and data error that is that obtain is larger, survey station breakpoint formula distributes, discontinuous, is subject to electromagnetic interference; Further, present coal mine roadway length is longer, carries out load-bearing monitor to single anchor rod, and workload is comparatively large, and inconvenient operation, when both taking a lot of work, uneconomical again, to realizing, the comprehensive on-line real time monitoring in coal mine tunnel is quite difficult.
Summary of the invention
The object of the invention is to provide that a kind of certainty of measurement is high, antijamming capability strong, can the continuous measurement Bolt Groups body of rod stressed, monitored data error is little, can the coal mine roadway distributed fiber grating Bolt Groups stress monitoring system of real time on-line monitoring.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of coal mine roadway distributed fiber grating Bolt Groups stress monitoring system, comprises roadway supported with bolts stress monitoring subsystem, digging laneway bolt support stress monitoring subsystem and working face open-off cut eye bolt support stress monitoring subsystem, above-mentioned three bolt support stress monitoring subsystems include several Monitor Sub-Station of Less, each Monitor Sub-Station of Less is all monitored roofbolt and two and is helped rockbolt stress, roofbolt and two in the Monitor Sub-Station of Less of each bolt support stress monitoring subsystem helps anchor pole to be cascaded by communication optical fiber, the exit communication optical fiber of three bolt support stress monitoring subsystems is connected with mining transmission cable by optical Fiber Closure, mining transmission cable is connected with the input port of the static (FBG) demodulator of fiber grating, the wavelength signals of input is demodulated into the signal of telecommunication by the static (FBG) demodulator of fiber grating, the output port of the static (FBG) demodulator of fiber grating is connected with computer data processing system, monitored data after process and ground-based computer are shared by server and colliery LAN by computer data processing system, form coal mine roadway Bolt Groups distribution of force formula, comprehensive on-line real time monitoring system.
Described Monitor Sub-Station of Less, according to the geological conditions in colliery and Mining technology condition quantification, arranges the quantity of anchor pole more in the place that geological conditions is poor.
Described roofbolt and two helps anchor pole to be fiber grating force-measuring anchor stock, the length of anchor pole is 180mm-240mm, one is carved deeply for 1.5mm, width are the groove of about 2mm in the bilateral symmetry of anchor rod body, by epoxy glue, fiber grating is fixed in groove, and draws connection line of optic fibre at the afterbody of anchor pole.
The method of attachment that described roofbolt and two helps anchor pole to be cascaded is that connection line of optic fibre is by optical fiber splicer welding or connected as one by fiber coupler.
The output port of the static (FBG) demodulator of described fiber grating passes through network interface or RS232 interface or USB interface and is connected with computer data processing system.
Described computer data processing system specifically comprises following subsystem:
(1) input subsystem, manually keys in the alarm threshold value arranging bolt design parameters and rockbolt stress according to mine situation;
(2) ADMINISTRATION SUBSYSTEM, to monitored data autostore, and can historical query and data information sharing;
(3) analyzing subsystem, carries out trend analysis to monitored data, parameter association analysis and comparative analysis;
(4) output subsystem, online Dynamic Announce monitoring parameter data, generate group financial statements and stress curve figure, export the dangerous integrated forecasting of tool and overload alarm situation, and have printing function.
Beneficial effect, owing to have employed such scheme, utilizes optical fiber by the side anchor pole in tunnel and roofbolt series connection, forms the grating anchor rod group stress monitoring network that sensing technology is in a distributed manner means.Utilize the fiber grating be pasted onto on anchor rod body as sensing element, realize the measurement of rockbolt stress.During surrouding rock deformation when between anchor pole location, because adhesion stress or frictional force make bolt deformation, the surrouding rock deformation of anchor pole constraint simultaneously, just makes anchor pole produce axial force, and the nut tension of anchor pole end produces again additional axial force in addition.Rockbolt stress will produce surperficial micro-strain, the pitch of the fiber grating be attached on anchor pole will be deformed with it, the reflection kernel wavelength of fiber grating will be caused to produce drift, the fiber bragg grating center wavelength value of each force-measuring anchor stock is all not identical, utilize the static (FBG) demodulator of fiber grating that different wavelength signals is demodulated into the signal of telecommunication, by computer data processing system, post-processed is carried out to the signal of telecommunication, interface Dynamic Announce Real-time Monitoring Data and rockbolt stress curve map, and carry out rockbolt stress trend analysis and overload alarm, realize coal mine roadway Bolt Groups stress real-time monitoring system, comprehensive understanding rockbolt stress situation, for the stability and safety that improve roadway surrounding rock provide foundation, ensure safety of coal mines High-efficient Production.
The present invention proposes coal mine roadway distributed fiber grating Bolt Groups stress monitoring system first, Bolt Groups stress monitoring network adopts the structure of series connection, fusion techniques or fiber coupler is utilized the fusion of the connection line of optic fibre of fiber grating force-measuring anchor stock to be integrated, decrease loss when fiber-optic signal is propagated, improve the degree of accuracy of rockbolt stress monitoring.The fiber grating that the present invention simultaneously utilizes is as sensing element, for on-the-spot non-active operation, essential safety, instead of traditional live line work sensor, improve the safety factor of coal mine working, system adopts all-fiber to carry out optical signal transmission, using optical signal as information carrier, reliability is high, and by the impact of colliery Zhong Shui, gas and other electromagnetic radiation, antijamming capability is strong.Long transmission distance, adapts to the long distance monitoring of coal mine roadway.System, to the comprehensive active monitoring of coal mine roadway Bolt Groups, decreases workload degree when monitoring single anchor rod, time saving and energy saving, easy for installation, reduces monitoring expense simultaneously, has far-reaching influence to realizing the comprehensive on-line real time monitoring in coal mine tunnel.
Accompanying drawing explanation
Fig. 1 is integral arrangement structure chart of the present invention.
Fig. 2 is computer data processing system functional block diagram of the present invention.
Fig. 3 is fiber grating force-measuring anchor stock structure chart of the present invention.
Fig. 4 is Bolt Groups connection layout in tunnel monitor substation of the present invention.
In figure, 1, anchor pole; 2, groove; 3, epoxy glue; 4, fiber grating; 5, connection line of optic fibre; 6, tunnel; 11, a side anchor pole; 12, No. two roofbolts; 13, No. three roofbolts; 14, No. four roofbolts; 15, No. five side anchor poles.
Detailed description of the invention
Below in conjunction with accompanying drawing, invention is further described:
Embodiment 1: in FIG, a kind of coal mine roadway distributed fiber grating Bolt Groups stress monitoring system, comprises roadway supported with bolts stress monitoring subsystem, digging laneway bolt support stress monitoring subsystem and working face open-off cut eye bolt support stress monitoring subsystem, above-mentioned three bolt support stress monitoring subsystems include several Monitor Sub-Station of Less, each Monitor Sub-Station of Less is all monitored roofbolt and two and is helped rockbolt stress, roofbolt and two in the Monitor Sub-Station of Less of each bolt support stress monitoring subsystem helps anchor pole to be cascaded by communication optical fiber, the exit communication optical fiber of three bolt support stress monitoring subsystems is connected with mining transmission cable by optical Fiber Closure, mining transmission cable is connected with the input port of the static (FBG) demodulator of fiber grating, the wavelength signals of input is demodulated into the signal of telecommunication by the static (FBG) demodulator of fiber grating, the output port of the static (FBG) demodulator of fiber grating is connected with computer data processing system, monitored data after process and ground-based computer are shared by server and colliery LAN by computer data processing system, form coal mine roadway Bolt Groups distribution of force formula, comprehensive on-line real time monitoring system.Described ground-based computer is the ground-based computer of colliery leader and desk work personnel manipulation.
Computer data processing system of the present invention as shown in Figure 2 specifically comprises following subsystem:
(1) input subsystem, manually keys in the alarm threshold value arranging bolt design parameters and rockbolt stress according to mine situation;
(2) ADMINISTRATION SUBSYSTEM, to monitored data autostore, and can historical query and data information sharing;
(3) analyzing subsystem, carries out trend analysis to monitored data, parameter association analysis and comparative analysis;
(4) output subsystem, online Dynamic Announce monitoring parameter data, generate group financial statements and stress curve figure, export the dangerous integrated forecasting of tool and overload alarm situation, and have printing function.
Fig. 3 is fiber grating force-measuring anchor stock, its structure is the length of anchor pole 1 is 180mm-240mm, carving one in the bilateral symmetry of anchor pole 1 body of rod is deeply the groove 2 that 1.5mm, width are about 2mm, is fixed in groove, and draws connection line of optic fibre 5 at the afterbody of anchor pole 1 by epoxy glue 3 by fiber grating 4.Fiber grating force-measuring anchor stock in use, the boring adapted with bolt diameter size is pierced in roadway surrounding rock, fiber grating force-measuring anchor stock is inserted in boring, and connection line of optic fibre is drawn boring outside, then pallet is put at the exposed junction of anchor pole successively, packing ring, nut screwing clamping, makes anchor pole be fixed in wall rock drill-hole.
Fig. 4 is Bolt Groups method of attachment in tunnel monitor substation, in a Monitor Sub-Station of Less in tunnel 6,5 fiber grating force-measuring anchor stocks are installed, are respectively side anchor pole 11, No. two roofbolts 12, No. three roofbolts 13, No. four roofbolts 14, No. five side anchor poles 15.Method of attachment is that a wherein connection line of optic fibre 5 of a side anchor pole 11 is fused by optical fiber splicer or by a wherein connection line of optic fibre of fiber coupler and No. two roofbolts 12, an other connection line of optic fibre of No. two roofbolts 12 and a wherein connection line of optic fibre of No. three roofbolts 13 are fused, be linked in sequence to a connection line of optic fibre of No. five side anchor poles 15 successively, an other connection line of optic fibre 5 of No. five side anchor poles 15 is connected with the connection line of optic fibre of the fiber grating force-measuring anchor stock in the next Monitor Sub-Station of Less in tunnel, Bolt Groups stress monitoring network in the tunnel of formation cascaded structure.

Claims (4)

1. a coal mine roadway distributed fiber grating Bolt Groups stress monitoring system, it is characterized in that: a kind of coal mine roadway distributed fiber grating Bolt Groups stress monitoring system, comprise roadway supported with bolts stress monitoring subsystem, digging laneway bolt support stress monitoring subsystem and working face open-off cut eye bolt support stress monitoring subsystem, above-mentioned three bolt support stress monitoring subsystems include several Monitor Sub-Station of Less, each Monitor Sub-Station of Less is all monitored roofbolt and two and is helped rockbolt stress, roofbolt and two in the Monitor Sub-Station of Less of each bolt support stress monitoring subsystem helps anchor pole to be cascaded by communication optical fiber, the exit communication optical fiber of three bolt support stress monitoring subsystems is connected with mining transmission cable by optical Fiber Closure, mining transmission cable is connected with the input port of the static (FBG) demodulator of fiber grating, the wavelength signals of input is demodulated into the signal of telecommunication by the static (FBG) demodulator of fiber grating, the output port of the static (FBG) demodulator of fiber grating is connected with computer data processing system, monitored data after process and ground-based computer are shared by server and colliery LAN by computer data processing system, form coal mine roadway Bolt Groups distribution of force formula, comprehensive on-line real time monitoring system,
The method of attachment that described roofbolt and two helps anchor pole to be cascaded is that connection line of optic fibre is by optical fiber splicer welding or connected as one by fiber coupler.
2. a kind of coal mine roadway distributed fiber grating Bolt Groups stress monitoring system according to claim 1, it is characterized in that: described roofbolt and two helps anchor pole to be fiber grating force-measuring anchor stock, the length of anchor pole is 180mm-240mm, one is carved deeply for 1.5mm, width are the groove of about 2mm in the bilateral symmetry of anchor rod body, by epoxy glue, fiber grating is fixed in groove, and draws connection line of optic fibre at the afterbody of anchor pole.
3. a kind of coal mine roadway distributed fiber grating Bolt Groups stress monitoring system according to claim 1, is characterized in that: the output port of the static (FBG) demodulator of described fiber grating passes through network interface or RS232 interface or USB interface and is connected with computer data processing system.
4. a kind of coal mine roadway distributed fiber grating Bolt Groups stress monitoring system according to claim 1, is characterized in that: described computer data processing system specifically comprises following subsystem:
(1) input subsystem, manually keys in the alarm threshold value arranging bolt design parameters and rockbolt stress according to mine situation;
(2) ADMINISTRATION SUBSYSTEM, to monitored data autostore, and can historical query and data information sharing;
(3) analyzing subsystem, carries out trend analysis to monitored data, parameter association analysis and comparative analysis;
(4) output subsystem, online Dynamic Announce monitoring parameter data, generate group financial statements and stress curve figure, export the dangerous integrated forecasting of tool and overload alarm situation, and have printing function.
CN201310264029.6A 2013-06-26 2013-06-26 Distributed optical fiber grating anchor rod group stress monitoring system for coal mine roadway Active CN103362552B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310264029.6A CN103362552B (en) 2013-06-26 2013-06-26 Distributed optical fiber grating anchor rod group stress monitoring system for coal mine roadway

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310264029.6A CN103362552B (en) 2013-06-26 2013-06-26 Distributed optical fiber grating anchor rod group stress monitoring system for coal mine roadway

Publications (2)

Publication Number Publication Date
CN103362552A CN103362552A (en) 2013-10-23
CN103362552B true CN103362552B (en) 2015-06-10

Family

ID=49364731

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310264029.6A Active CN103362552B (en) 2013-06-26 2013-06-26 Distributed optical fiber grating anchor rod group stress monitoring system for coal mine roadway

Country Status (1)

Country Link
CN (1) CN103362552B (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103510986B (en) * 2013-10-25 2015-05-20 中国矿业大学 Tunnel roof separation dynamic monitoring system based on fiber bragg grating and early-warning method thereof
CN103528732A (en) * 2013-10-25 2014-01-22 中国矿业大学 Coal mine goaf top plate strain monitoring system and method based on fiber bragg grating sensing
CN103528731B (en) * 2013-10-25 2015-10-21 中国矿业大学 A kind of coal mine paste filling on-line monitoring system based on optical fiber grating sensing
CN103696807A (en) * 2013-12-02 2014-04-02 姚舜才 Centralized and distributed wireless sensor network environment monitoring and control system for coal mine emergency shelters
CN104343466B (en) * 2014-10-15 2017-02-08 中国科学院合肥物质科学研究院 All-fiber coal mine safety monitoring system
CN105758565B (en) * 2016-03-03 2018-09-28 山东科技大学 Coal roadway tunneling is met head on stress determination method and risk assessment method
CN105888710B (en) * 2016-05-30 2017-12-19 辽宁工程技术大学 A kind of roadway bolt monitoring system
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
CN107246886A (en) * 2017-07-11 2017-10-13 中国矿业大学 Ore deposit pressure signal real-time visual demodulating system and demodulation method based on Fibre Optical Sensor
CN107356957A (en) * 2017-07-11 2017-11-17 中国矿业大学 A kind of Microseismic monitoring system and installation and monitoring method based on optical fibre grating acceleration sensor
CN109555562B (en) * 2018-11-26 2020-04-10 湘潭大学 Deep stope face roof surrounding rock monitoring system and method
CN110439618B (en) * 2019-08-16 2021-07-02 山东道宽智能科技有限公司 Mining optical fiber roof dynamic monitoring and crushing treatment system
CN112081627B (en) * 2020-09-02 2021-06-15 中国矿业大学 Mine distributed coal rock deformation point positioning method and device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10006197C1 (en) * 2000-02-11 2001-05-17 Rag Ag Anchor monitor at mining works has a fixed register with integrated movement sensors at the anchor head with coupling wires to detect movements through shifts in the rock formation
CN102140796A (en) * 2010-12-24 2011-08-03 大连理工大学 Intelligent fiber reinforced plastic (FRP) anchor rod
CN102174898A (en) * 2011-02-24 2011-09-07 江苏三恒科技集团有限公司 Mine ground pressure monitoring system
CN202033138U (en) * 2010-11-08 2011-11-09 昆明理工大学 Fiber Bragg grating distributed anchor pole force cell sensor
CN102720515A (en) * 2012-06-29 2012-10-10 山东大学 Fiber bragg grating prestress measurement anchor rod and application method thereof
CN102798492A (en) * 2012-08-30 2012-11-28 西安科技大学 Fiber bragg grating detection system device and method for detecting anchoring force of anchor rod

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10006197C1 (en) * 2000-02-11 2001-05-17 Rag Ag Anchor monitor at mining works has a fixed register with integrated movement sensors at the anchor head with coupling wires to detect movements through shifts in the rock formation
CN202033138U (en) * 2010-11-08 2011-11-09 昆明理工大学 Fiber Bragg grating distributed anchor pole force cell sensor
CN102140796A (en) * 2010-12-24 2011-08-03 大连理工大学 Intelligent fiber reinforced plastic (FRP) anchor rod
CN102174898A (en) * 2011-02-24 2011-09-07 江苏三恒科技集团有限公司 Mine ground pressure monitoring system
CN102720515A (en) * 2012-06-29 2012-10-10 山东大学 Fiber bragg grating prestress measurement anchor rod and application method thereof
CN102798492A (en) * 2012-08-30 2012-11-28 西安科技大学 Fiber bragg grating detection system device and method for detecting anchoring force of anchor rod

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
用光纤光栅传感监测系统对矿井井壁应变实施检测的研究;王青春等;《煤炭工程》;20141230(第8期);86-87 *

Also Published As

Publication number Publication date
CN103362552A (en) 2013-10-23

Similar Documents

Publication Publication Date Title
CN103362552B (en) Distributed optical fiber grating anchor rod group stress monitoring system for coal mine roadway
CN103362553B (en) Coal mine underground safety comprehensive monitoring system based on fiber grating sensors
CN203259281U (en) Coal mine downhole optical fiber raster multi-measuring point anchor pole stress measuring device
CN103454021B (en) Roadway surrounding rock stress monitoring device based on fiber bragg grating sensing
AU2017204543A1 (en) System for dynamically monitoring roadway roof separation based on fibre grating and pre-warning method
CN103454020B (en) Surrounding rock stress on-line monitoring system and method based on fiber bragg grating borehole stress meter
CN103364104B (en) System and method for sensing and monitoring temperature of fiber bragg grating in goaf of coal mine coalface
CN103528731B (en) A kind of coal mine paste filling on-line monitoring system based on optical fiber grating sensing
CN103527248B (en) Based on coal mine roof plate water barrier Stability Monitoring System and the method for fiber grating
CN201278201Y (en) Pipeline landslide monitoring pre-alarming system based on fiber grating
CN104142187A (en) Gob-side entry retaining pasty filler on-line detection method
CN103257009A (en) Working face mine pressure on-line monitoring system based on fiber grating sensing
CN103528732A (en) Coal mine goaf top plate strain monitoring system and method based on fiber bragg grating sensing
CN110439618B (en) Mining optical fiber roof dynamic monitoring and crushing treatment system
CN103528749B (en) Based on coal mine tunnel top board hydraulic pressure on-line monitoring system and the method for fiber grating
CN108195304A (en) A kind of Coal Face with Greater Mining Height coal wall caving depth assay method
CN103994846A (en) Device and method for testing surrounding rock stress field distribution
CN202417600U (en) Full-fiber temperature monitoring system in underground gob of coal mine
CN203642880U (en) Fiber bragg grating distributed displacement sensor monitoring inner deformation of side slope
CN102705012A (en) Monitoring system of coal roadway roof separation based on M-BUS
CN202690096U (en) Fiber bragg grating force-measuring anchor rod
CN203879550U (en) Monitoring device for coal mine tunnel based on fiber gratings
CN106401652A (en) Tandem type network construction method for tunnel remote on-line remote-measuring system
CN202648584U (en) External port free type convergence instrument
Wang et al. Research on Monitoring of Coal Mine Shaft Deformation Based on Fiber Grating Technology

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant