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CN104713490B - A kind of apparatus and method based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string - Google Patents

A kind of apparatus and method based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string Download PDF

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Publication number
CN104713490B
CN104713490B CN201510056789.7A CN201510056789A CN104713490B CN 104713490 B CN104713490 B CN 104713490B CN 201510056789 A CN201510056789 A CN 201510056789A CN 104713490 B CN104713490 B CN 104713490B
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China
Prior art keywords
flange
displacement meter
country rock
optical fiber
fiber grating
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Expired - Fee Related
Application number
CN201510056789.7A
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Chinese (zh)
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CN104713490A (en
Inventor
任大春
樊义林
王万顺
李秀文
汤国强
段杭
上官瑾
于胜利
柯传芳
胡旭阳
黄和平
毛艳平
孙建会
姜龙
朱赵辉
许源
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BEIJING IWHR Corp (BIC)
China Three Gorges Corp
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BEIJING IWHR Corp (BIC)
China Three Gorges Corp
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Priority to CN201510056789.7A priority Critical patent/CN104713490B/en
Publication of CN104713490A publication Critical patent/CN104713490A/en
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Abstract

The displacement meter being sequentially connected with is included based on apparatus and method of the Optical Fiber Grating Displacement Meter string based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string, described device the invention discloses a kind of;The displacement meter includes displacement induction mechanism and the signal switching mechanism connected by signal transmission mechanism;The displacement of the country rock of its installation site is changed into the signal that can be conveyed by signal transmission mechanism by the displacement induction mechanism, then according to displacement conversion dependent variable;The signal switching mechanism includes display screen;Methods described carries out following steps using the device:The measurement direction strained along country rock opens up mounting hole on country rock;According to the displacement meter of the length assembling respective numbers on detection direction;The device loading mounting hole based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string finished will be assembled;Slurries are poured into mounting hole, slurries harden the displacement induction mechanism and are combined into one with country rock.Beneficial effects of the present invention are:The big strain of continuous accurate measurement country rock.

Description

A kind of apparatus and method based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string
Technical field
The present invention relates to geological survey technical field, and in particular to one kind is big based on Optical Fiber Grating Displacement Meter string measurement country rock The apparatus and method of strain.
Background technology
Hydroelectric project underground chamber monitoring country rock strain monitoring is mainly using embedded unidirectional strain gauge or fiber grating at present Strain gauge is realized.The range of two kinds of strain gauges is generally 3000 μ ε (the wherein μ ε of stretching strain 2500, the μ ε of compressive strain 500), gauge length The 250mm measurable maximum distortion of strain gauge only 0.75mm.And underground rock cavern when being constructed Excavation blasting etc. influence, prop up Subregion deformation is even more big up to 10-20mm after shield.Although high using strain gauge measurement country rock strain precision, monitor Device easily fails, and is unable to reach monitoring purpose.
The content of the invention
It is an object of the invention to provide it is a kind of based on Optical Fiber Grating Displacement Meter string measurement the big strain of country rock apparatus and method, To overcome deficiencies of the prior art.
The purpose of the present invention is achieved through the following technical solutions:
A kind of device based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string, including the displacement meter being sequentially connected with;
The displacement meter includes displacement induction mechanism and the signal switching mechanism connected by signal transmission mechanism;
The displacement of the country rock of its installation site is changed into by the displacement induction mechanism can be defeated by signal transmission mechanism The signal sent;
The signal switching mechanism includes display screen, and the signal switching mechanism turns the signal from signal transmission mechanism It is changed into readable information.
Preferably, the displacement is calculated as Optical Fiber Grating Displacement Meter, and the signal transmission mechanism is optical cable, the optical cable along It is described based on Optical Fiber Grating Displacement Meter string measurement the big strain of country rock device it is axially arranged.
Preferably, the Optical Fiber Grating Displacement Meter is the Optical Fiber Grating Displacement Meter with temperature-compensating, the signal interpreter Structure is modulation /demodulation instrument.
Further, the displacement induction mechanism include be sequentially connected first flange, head rod, displacement sensing Device, bourdon tube, the second connecting rod and second flange;The first flange is connected with the second flange, and the optical cable connects successively Connect the displacement sensor.
Preferably, connected between the bourdon tube and second connecting rod by stainless steel measuring staff.
Preferably, it is arranged with protection between the first flange and second flange at same Optical Fiber Grating Displacement Meter both ends Pipe, the slurries for pouring into mounting hole to be isolated in the outside of the Optical Fiber Grating Displacement Meter;
The protecting tube includes the first protecting tube and the second protecting tube, and the quantity of first protecting tube is two, described The quantity of second protecting tube is one, and the first flange and the second flange are cylinder boss, and one of them described the One end of one protecting tube is airtightly fixed on the less face of cylinder of radius of the first flange, and the one of another protecting tube End is airtightly fixed on the less face of cylinder of second flange radius, and the other end of two first protecting tubes is airtightly It is fixed on the inwall of the second protecting tube.
Preferably, present invention additionally comprises steel wire;
The steel wire passed through for the steel wire is equipped with the first flange and the second flange and passes through hole, the steel wire The steel wire, which is sequentially passed through, along the axial direction of the measurement big strain of country rock passes through hole;
If the bird caging, into passive node, the node includes first flange node, second flange node and middle knot The quantity of point, the quantity of the first flange node and the second flange node is two;
Two first flange nodes are arranged on the dress based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string The both sides of the first flange of the one end put, and the first flange for being arranged on the end is fixed on two first flange nodes Between;
Two second flange nodes are arranged on the dress based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string The both sides of the second flange for the other end put, and the second flange for being arranged on the end is fixed on two second flange knots Between point;
The intermediate node is arranged on the first flange of mating connection and the both sides of second flange, and by mating connection First flange and second flange are stuck between two adjacent intermediate nodes.
Preferably, the optical cable positioned at mounting hole bottom curves annular shape, and is provided with the optical cable outer cover in annular shape Flexible pipe.
It is big using the measurement device country rock based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string of above-mentioned technical proposal The method of strain, this method comprise the following steps:
S1, the measurement direction strained along country rock open up mounting hole on country rock;
S2, formed according to the displacement meter of the length assembling respective numbers on detection direction and surveyed based on Optical Fiber Grating Displacement Meter string Measure the device of the big strain of country rock;
S3, the device that the big strain of country rock is measured based on Optical Fiber Grating Displacement Meter string for finishing assembling load mounting hole;
S4, slurries are poured into mounting hole, the displacement induction mechanism is combined into one with country rock after slurries hardening.
Further, the slurries in step S4 are cement grout.
Beneficial effects of the present invention are:
By the way that branched Optical Fiber Grating Displacement Meter is assembled into bunchiness, ring flange spacing (gauge length) is accurately positioned, utilizes what is measured Shift value can calculate the continuous strain value of country rock different depth.Even if a certain measuring point occurs outranging situation during monitoring, Other measuring points are not interfered with normally to monitor.The strained situation axial along whole piece survey line of country rock can be measured.
Solve the problems, such as that fiber grating strain meter and unidirectional strain gauge can not measure the big strain of country rock, and using band temperature The Optical Fiber Grating Displacement Meter of degree compensation can avoid temperature from influenceing.By the way that different Optical Fiber Grating Displacement Meter groups are connected into bunchiness, can connect It is continuous to measure the big strain of underground rock cavern.The invention is simple to operate, economical and practical, has good application prospect.
Brief description of the drawings
Fig. 1 is the structural representation of single branch Optical Fiber Grating Displacement Meter;
Fig. 2 is the sectional view of first flange;
Fig. 3 is sectional views of the Fig. 2 along A-A;
Fig. 4 is sectional views of the Fig. 2 along B-B;
Fig. 5 is sectional views of the Fig. 2 along C-C;
Fig. 6 is sectional views of the Fig. 2 along D-D;
Fig. 7 is the sectional view of second flange;
Fig. 8 is sectional views of the Fig. 7 along A-A;
Fig. 9 is sectional views of the Fig. 7 along B-B;
Figure 10 is sectional views of the Fig. 7 along C-C;
Figure 11 is sectional views of the Fig. 7 along D-D;
Figure 12 is the assembling schematic diagram of Optical Fiber Grating Displacement Meter.
In figure, 1, first flange;2nd, second flange;3rd, optical cable;4th, head rod;5th, fix bar;6th, displacement sensor; 7th, bourdon tube;8th, stainless steel measuring staff;9th, the second connecting rod;10th, the first groove;11st, the first screw;12nd, the second groove;13rd, One central through hole;14th, the second central through hole;15th, the first protecting tube;16th, the second protecting tube;17th, self-tapping screw;18th, steel wire.
Embodiment
Preferred embodiment
A kind of device based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string, including the displacement meter being sequentially connected with;
The displacement meter includes displacement induction mechanism and the signal switching mechanism connected by signal transmission mechanism;
The displacement of the country rock of its installation site is changed into by the displacement induction mechanism can be defeated by signal transmission mechanism The signal sent;
The signal switching mechanism includes display screen, and the signal switching mechanism turns the signal from signal transmission mechanism It is changed into readable information.
The displacement is calculated as Optical Fiber Grating Displacement Meter, and the signal transmission mechanism is optical cable 3, and the optical cable 3 is along described The axially arranged of the device of the big strain of country rock is measured based on Optical Fiber Grating Displacement Meter string.
The Optical Fiber Grating Displacement Meter is the Optical Fiber Grating Displacement Meter with temperature-compensating, and the signal switching mechanism is modulation (FBG) demodulator.
The displacement induction mechanism include be sequentially connected first flange 1, head rod 4, displacement transducer 6, spring Pipe 7, the second connecting rod 9 and second flange 2;The first flange 1 is connected with the second flange 2, and the optical cable 3 is sequentially connected The displacement sensor.
Connected between the bourdon tube 7 and second connecting rod 9 by stainless steel measuring staff 8.
Protecting tube is arranged between the first flange 1 and second flange 2 at same Optical Fiber Grating Displacement Meter both ends, to The slurries for pouring into mounting hole are isolated in the outside of the Optical Fiber Grating Displacement Meter;
The protecting tube includes the first protecting tube 15 and the second protecting tube 16, and the quantity of first protecting tube 15 is two Individual, the quantity of second protecting tube 16 is one, and the first flange 1 and the second flange 2 are cylinder boss, wherein One end of one first protecting tube 15 is airtightly fixed on the less face of cylinder of radius of the first flange 1, in addition One end of one protecting tube is airtightly fixed on the less face of cylinder of the radius of second flange 2, two first protecting tubes 15 other end is airtightly fixed on the inwall of the second protecting tube 16.
The present embodiment also includes steel wire 18;It is equipped with the first flange 1 and the second flange 2 for the steel wire 18 The steel wire passed through sequentially passes through the steel wire and passes through hole by hole, axial direction of the steel wire 18 along the measurement big strain of country rock; If the steel wire 18 is knotted into passive node, the node includes the node of first flange 1, the node of second flange 2 and intermediate node, institute It is two to state the quantity of the node of first flange 1 and the quantity of the node of the second flange 2;Two nodes of first flange 1 The both sides of the first flange 1 of one end of the device based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string are arranged on, and And the first flange 1 for being arranged on the end is fixed between two first flange nodes;Two nodes of second flange 2 The both sides of the second flange 2 of the other end of the device based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string are arranged on, And the second flange 2 for being arranged on the end is fixed between two second flange nodes;The intermediate node is arranged on The first flange 1 of mating connection and the both sides of second flange 2, and the first flange 1 of mating connection and second flange 2 are stuck in Between two adjacent intermediate nodes.
Optical cable 3 positioned at mounting hole bottom curves annular shape, and is provided with flexible pipe in the outer cover of optical cable 3 in annular shape.
It is big using the measurement device country rock based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string of above-mentioned technical proposal The method of strain, this method comprise the following steps:
S1, the measurement direction strained along country rock open up mounting hole on country rock;
S2, formed according to the displacement meter of the length assembling respective numbers on detection direction and surveyed based on Optical Fiber Grating Displacement Meter string Measure the device of the big strain of country rock;
S3, the device that the big strain of country rock is measured based on Optical Fiber Grating Displacement Meter string for finishing assembling load mounting hole;
S4, cement grout is poured into mounting hole, combined the displacement induction mechanism with country rock after cement grout hardening Integrally.
During single branch Optical Fiber Grating Displacement Meter assembling, as Figure 1-Figure 11, Fig. 1 show single branch Optical Fiber Grating Displacement Meter group Fill schematic diagram.The tail end of displacement sensor 6 is the threaded mother's M6 screws of deep 10mm, by the front end M6 screws of connecting rod 1 of design It is screwed into screw, then rotates first flange 1, the tail end of head rod 4 is screwed into the first central through hole 13 of flange.By The tail end screw of two connecting rod 9 is screwed into the M5 screws in stainless steel measuring staff 8, is rotated second flange 2, is made the front end of the second connecting rod 9 It is screwed into the second central through hole 14 of second flange 2.Prestretching 5mm rear flanges 1 keep 500mm with the both ends spacing of flange 2.Every group of light The head and the tail length of fine grating displacement meter optical cable 3 is different according to burial place, advance reservation.
Figure 12 show displacement meter string assembling schematic diagram.Incorporation engineering is actual, and each mounting hole can be with Embedded installation 20-30 Branch Optical Fiber Grating Displacement Meter, every Optical Fiber Grating Displacement Meter prestretching rear flange spacing can use 500mm-2000mm, using the present invention Device can measure the big strain of 15-30m depth country rocks.To realize the purpose of the measurement big strain of country rock, while ensure fiber grating The measurement accuracy of displacement meter, each displacement meter group are sequentially connected in series the optical cable of six Optical Fiber Grating Displacement Meters.In this example explanation Single branch Optical Fiber Grating Displacement Meter assembles prestretching 5mm latter two flange spacing 500mm, and the optical cable total length between flange is 400mm.Will Displacement meter group (having assembled connecting rod, the non-mounting flange) level connected is placed in a straight line.150mm is taken to grow first Protecting tube 15, on the circular arc away from its one end 6mm, equidistantly make a call to three holes, aperture 4mm.The first protection that two are processed Pipe 15, it is adjacent that two pipes do not punch one end;Two pipes are penetrated from displacement meter group bottom, make the perforate end position of two PVC-U pipes In the both ends of first displacement meter in displacement meter group bottom.Second protecting tube of 300mm 16 is taken, is being respectively 25mm away from its both ends Three holes, aperture 4mm equidistantly make a call in place.The second protecting tube 16 processed is penetrated from displacement meter group bottom, is located at two Among the first protecting tube of root 15.First flange 1 is rotated, the tail end of head rod 4 is screwed into the M6 screws 13 of first flange 1, First protecting tube 15 is inserted in the small cylinder of first flange 1, makes PVC-U pipes tapping and three second in first flange 1 Groove 12 is corresponding, and M4 screws are screwed into screw respectively, so that the first protecting tube 15 is fixed in first flange 1.Rotation the Two flanges 2, the front end of the second connecting rod 9 is screwed into the M5 screws 14 of second flange 2, the first protecting tube 15 is inserted in second flange 2 small cylinder, make PVC-U pipes tapping corresponding with three the second grooves 12 in second flange 2, respectively twist M4 screws Enter screw, so as to which the first protecting tube 15 is fixed in second flange 2.In the second protecting tube 16 close to the one end of first flange 1 PVC-U pipes tapping is screwed into self-tapping screw 17 successively, and it is 100mm to make distance of the end away from flange 1.Prestretching is carried out to displacement meter, Prestretching length 5mm, first flange 1 and the both ends spacing of second flange 2 are 500mm after prestretching.Then successively in the second protecting tube 16 PVC-U pipe tappings close to the one end of second flange 2 are screwed into self-tapping screw 17, and the second protecting tube 16 is fixed.Hereafter pacify every time PVC-U pipes are penetrated from displacement meter group top during dress, the second protecting tube 16 is worn after first wearing the first protecting tube 15, repeats five times.Will Second flange 2 on previous branch displacement meter and next screw connection of the first flange 1 with nut, are fixedly connected sequentially five It is secondary, six displacement meters are fixedly connected into one group.The contact position of different model PVC-U pipes is snarled with adhesive tape, when preventing grouting Cement enters in pipe.M4 screws are screwed into by the second flange 2 of every group of the 6th displacement meter and next group of first displacement meter first Flange 1 is fixedly connected (optical cable is not connected to), Embedment and installation after the different displacement meter groups assembling bunchiness of same mounting hole.
Weight is larger after being assembled due to multigroup Optical Fiber Grating Displacement Meter, is further fixing device, Optical Fiber Grating Displacement Meter Displacement meter after more strings are protected according to the design quantity in every hole is with band banding fixed on steel wire 18, and steel wire 18 is by every During individual flange, through the first screw 11 on the big cylinder of flange and knot.Monitored for ease of the later stage, often the light of string displacement meter group Cable needs to lead to factory's top observation anchor caverns.The optical cable of each displacement meter group passes through from protection pipe, when optical cable passes through flange It is absorbed in the first groove 10.To be damaged when avoiding the optical cable of displacement meter group bottom from bending, the protection of bottom cable sheath flexible pipe, circle is curved Ring-type.After instrument and optical cable colligation are good, displacement meter group is put into hole successively, enters during hole while is put into grout pipe.Decentralization During pay attention to protection instrument and optical cable, in order to avoid damage.It is observed during daily observation using portable (FBG) demodulator, it is possible to achieve Electrical measurement, it is more convenient.
During using the present invention, it is embedded in after improved Optical Fiber Grating Displacement Meter string is completed in mounting hole, backfill fills Device flange is combined closely by cement grout and surrounding rock of chamber after slurry.Monitoring obtains displacement variable at measuring point, due to displacement Meter gauge length is definite value, can show that country rock strains at measuring point by calculating.Incorporation engineering is actual, each mounting hole design and installation 20-30 branch displacement meters, ring flange spacing take 500mm-2000mm, are surveyed by connecting bunchiness and exporting whole piece branched displacement meter group Axial strain on line, it can continuously measure the country rock strain of complete opening depth.
The present invention is not limited to above-mentioned preferred forms, and anyone can show that other are various under the enlightenment of the present invention The product of form, however, make any change in its shape or structure, it is every that there is skill identical or similar to the present application Art scheme, is within the scope of the present invention.

Claims (4)

  1. A kind of 1. device based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string, it is characterised in that
    Including the displacement meter being sequentially connected with;
    The displacement meter includes displacement induction mechanism and the signal switching mechanism connected by signal transmission mechanism;
    The displacement of the country rock of its installation site is changed into what can be conveyed by signal transmission mechanism by the displacement induction mechanism Signal;
    The signal switching mechanism includes display screen, and the signal from signal transmission mechanism is changed into by the signal switching mechanism Readable information;
    The displacement is calculated as Optical Fiber Grating Displacement Meter, and the signal transmission mechanism is optical cable, and the optical cable is based on light along described Fine grating displacement meter string measures the axially arranged of the device of the big strain of country rock;
    The displacement induction mechanism include be sequentially connected first flange, head rod, displacement transducer, bourdon tube, second Connecting rod and second flange;The first flange is connected with the second flange, and the optical cable is sequentially connected the displacement sensing Device;
    Connected between the bourdon tube and second connecting rod by stainless steel measuring staff;Positioned at same Optical Fiber Grating Displacement Meter two Protecting tube is arranged between the first flange and second flange at end, the slurries for pouring into mounting hole are isolated in into the optical fiber light The outside of grid displacement meter;
    The protecting tube includes the first protecting tube and the second protecting tube, and the quantity of first protecting tube is two, and described second The quantity of protecting tube is one, and the first flange and the second flange are cylinder boss, and one of them is described first anti- One end of pillar is airtightly fixed on the less face of cylinder of radius of the first flange, one end gas of another protecting tube Thickly it is fixed on the less face of cylinder of second flange radius, the other end of two first protecting tubes is airtightly fixed On the inwall of the second protecting tube;
    Also include steel wire;
    The steel wire that passes through for the steel wire is equipped with the first flange and the second flange by hole, the steel wire is along institute The axial direction for stating the measurement big strain of country rock sequentially passes through the steel wire and passes through hole;
    If the bird caging includes first flange node, second flange node and intermediate node, institute into passive node, the node It is two to state the quantity of first flange node and the quantity of the second flange node;
    Two first flange nodes are arranged on the device based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string The both sides of the first flange of one end, and by the first flange for being arranged on the end be fixed on two first flange nodes it Between;
    Two second flange nodes are arranged on the device based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string The both sides of the second flange of the other end, and by the second flange for being arranged on the end be fixed on two second flange nodes it Between;
    The intermediate node is arranged on the first flange of mating connection and the both sides of second flange, and by the first of mating connection Flange and second flange are stuck between two adjacent intermediate nodes;
    Optical cable positioned at mounting hole bottom curves annular shape, and is provided with flexible pipe in the optical cable outer cover in annular shape.
  2. 2. the device according to claim 1 based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string, it is characterised in that The Optical Fiber Grating Displacement Meter is the Optical Fiber Grating Displacement Meter with temperature-compensating, and the signal switching mechanism is modulation /demodulation instrument.
  3. 3. it is a kind of measure the big strain of country rock method, it is characterised in that usage right require 1-2 any one of based on light The device of the fine grating displacement meter string measurement big strain of country rock, methods described comprise the following steps:
    S1, the measurement direction strained along country rock open up mounting hole on country rock;
    S2, formed according to the displacement meter of the length assembling respective numbers on detection direction and enclosed based on Optical Fiber Grating Displacement Meter string measurement The device of the big strain of rock;
    S3, the device that the big strain of country rock is measured based on Optical Fiber Grating Displacement Meter string for finishing assembling load mounting hole;
    S4, slurries are poured into mounting hole, the displacement induction mechanism is combined into one with country rock after slurries hardening.
  4. 4. the method for the measurement big strain of country rock according to claim 3, it is characterised in that the slurries in step S4 are cement Slurries.
CN201510056789.7A 2015-02-03 2015-02-03 A kind of apparatus and method based on the measurement big strain of country rock of Optical Fiber Grating Displacement Meter string Expired - Fee Related CN104713490B (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN109141265A (en) * 2018-07-12 2019-01-04 中国水利水电科学研究院 A kind of advanced monitoring device of tunnel excavation country rock overall process deformation curve and its implementation method

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CN108519072B (en) * 2018-05-11 2019-10-18 中国科学院武汉岩土力学研究所 Rock deformation measuring device and rock measuring equipment

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US4138196A (en) * 1977-07-06 1979-02-06 The United States Of America As Represented By The Secretary Of The Army Fiber interferometer rotary motion sensor
CN103454021A (en) * 2013-08-15 2013-12-18 中国矿业大学 Tunnel surrounding rock stress monitoring device based on fiber grating sensing
CN104006744A (en) * 2014-04-29 2014-08-27 昆明理工大学 Side slop optical fiber Bragg optical grating multi-point displacement sensor and using method thereof
CN204007519U (en) * 2014-08-20 2014-12-10 武汉光驰科技有限公司 Optical fiber optical grating sensing experiment instrument

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US4133612A (en) * 1977-07-06 1979-01-09 The United States Of America As Represented By The Secretary Of The Army Endless fiber interferometer rotary motion sensor
US4138196A (en) * 1977-07-06 1979-02-06 The United States Of America As Represented By The Secretary Of The Army Fiber interferometer rotary motion sensor
CN103454021A (en) * 2013-08-15 2013-12-18 中国矿业大学 Tunnel surrounding rock stress monitoring device based on fiber grating sensing
CN104006744A (en) * 2014-04-29 2014-08-27 昆明理工大学 Side slop optical fiber Bragg optical grating multi-point displacement sensor and using method thereof
CN204007519U (en) * 2014-08-20 2014-12-10 武汉光驰科技有限公司 Optical fiber optical grating sensing experiment instrument

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109141265A (en) * 2018-07-12 2019-01-04 中国水利水电科学研究院 A kind of advanced monitoring device of tunnel excavation country rock overall process deformation curve and its implementation method
CN109141265B (en) * 2018-07-12 2019-09-06 中国水利水电科学研究院 An advanced monitoring device and implementation method for the deformation curve of the surrounding rock in the whole process of tunnel excavation

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