CN209055073U - Crack width monitoring system based on fiber grating technology - Google Patents
Crack width monitoring system based on fiber grating technology Download PDFInfo
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- CN209055073U CN209055073U CN201822153896.3U CN201822153896U CN209055073U CN 209055073 U CN209055073 U CN 209055073U CN 201822153896 U CN201822153896 U CN 201822153896U CN 209055073 U CN209055073 U CN 209055073U
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- fiber grating
- crack
- displacement
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- fiber
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- 239000000835 fiber Substances 0.000 title claims abstract description 60
- 238000012544 monitoring process Methods 0.000 title claims abstract description 49
- 238000005516 engineering process Methods 0.000 title claims abstract description 17
- 238000006073 displacement reaction Methods 0.000 claims abstract description 73
- 239000011435 rock Substances 0.000 claims description 8
- 239000002689 soil Substances 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 4
- 239000013307 optical fiber Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 238000005065 mining Methods 0.000 abstract 2
- 239000003673 groundwater Substances 0.000 abstract 1
- 206010017076 Fracture Diseases 0.000 description 19
- 208000010392 Bone Fractures Diseases 0.000 description 15
- 239000002184 metal Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
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- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000010412 perfusion Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000010621 bar drawing Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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- 239000002002 slurry Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The utility model provides a crack width monitoring system based on fiber grating technique, including fiber grating displacement monitoring pole, transmission fiber grating demodulation appearance. Install fiber grating displacement monitoring pole in the monitoring area that ground crack is grown, measure fiber grating displacement sensor's displacement variation between a plurality of fiber grating displacement monitoring poles through wireless transmission fiber grating demodulator, through wireless data transmission module among the demodulator, with displacement data transmission to remote monitoring room, realize the wireless monitoring system of crack displacement. The utility model discloses combine two dot-line type, three point triangle form sensor's in the monitoring area arrangement technology, utilize crack deformation displacement computational formula, confirm the relative displacement and the absolute displacement variation volume that ground crack warp, solved mining subsidence area and groundwater and taken out ground crack measuring high accuracy requirements such as mining area.
Description
Technical field
It is especially a kind of based on Fiber Bragg Grating technology the utility model relates to the monitoring system of surface cracks deformed width
Fracture width monitors system.It is mainly used for the deformation monitoring of Rock And Soil crack or distress in concrete.
Background technique
Crack disaster be the lower ground deformation disaster generated is acted on by earth intrinsic and external motive, including Rock And Soil ground fractures,
Distress in concrete.The generation and development in these cracks, drastically influence engineering service life and social stability.Pass through the long-term of fracture
Deformation monitoring provides theoretical foundation for fracture development mechanism and improvement.
At present in terms of related fracture width monitoring method, the deformation that GPS and INSAR technology is applied to surface crack is supervised
It surveys, but the monitoring accuracy of above-mentioned technology is influenced by factors such as weather, ground obstacles and is difficult to meet high-precision, continuous monitoring is wanted
It asks.Test equipment based on resistance class or vibratory string class displacement sensor, humidity resistance is poor, durability is bad, for fracture width
The accuracy of long term monitoring, safety, stability etc. have certain limitation.
Summary of the invention
In view of the above shortcomings of the prior art, the utility model provides a kind of fracture width prison based on Fiber Bragg Grating technology
Examining system.
To achieve the above objectives, the present invention adopts the following technical solutions:
Fracture width based on Fiber Bragg Grating technology monitors system, including fiber grating displacement monitoring rod, fiber grating solution
Adjust instrument；The stay-supported optical fiber grating displacement sensor that the fiber grating displacement monitoring rod includes straight-bar, is mounted on straight-bar；Two
A fiber grating displacement monitoring rod is connected by wirerope, and one end of wirerope and the bracing wire of fiber grating displacement sensor connect
It connects, the other end is connect with straight-bar；Fiber grating displacement sensor is connected with fiber Bragg grating (FBG) demodulator by optical cable.
Further, the fiber grating displacement monitoring rod at least two are separately mounted to crack two sides, two optical fiber light
The line of grid displacement monitoring bar is perpendicular to fracture extension direction, and wherein at least one fiber grating displacement monitoring rod is installed on and splits
Stitch disturbing influence region；The straight-bar is vertical to be assigned into the Rock And Soil of crack side, and consistent with Rock And Soil compatibility of deformation.
Further, the fiber grating displacement monitoring rod has two, crack disturbing influence region is each attached to, to survey
Measure relative shift between two o'clock.
Further, the fiber grating displacement monitoring rod has two, and one is arranged in crack disturbing influence region, another
Root is arranged in outside the influence area of crack, to measure stratum absolute displacement amount.
Further, the fiber grating displacement monitoring rod has three, and cloth is distinguished perpendicular to fracture extension direction in two edges
Crack disturbing influence area fractures two sides are set, in addition one is arranged in outside the influence area of crack, and three straight-bars are not in same
On straight line.
Further, the fiber grating displacement sensor and wirerope are horizontal.
The utility model has the advantages that Fiber Bragg Grating FBG (Fiber Bragg Grating) the technology optical fiber completely new as one
Monitoring technology, good, electromagnetism interference and electricity are exhausted with high resolution and sensitivity for the displacement sensor based on Fiber Bragg Grating technology
Edge is good, is easily achieved many advantages, such as remote monitoring.The utility model has the following beneficial effects:
1, the fiber grating displacement monitoring rod of the utility model is easily installed fiber grating displacement sensor, is convenient for two light
The connection of fiber grating displacement sensor and straight-bar between fine pattern displacement monitoring rod；
2, fiber grating displacement monitoring rod is consistent with tested Rock And Soil compatibility of deformation, is capable of the deformation in accurate response crack；
3, the installation site of fiber grating displacement monitoring rod can flexible choice according to actual needs；
4, the relative displacement and absolute displacement measurement method of the utility model Fracture Deformation in combination, solves and adopts depression
The high-precision requirement of the ground fissures such as area and underground water extraction area measurement.
Detailed description of the invention
Fig. 1 is surface cracks wireless test system schematic diagram；
Fig. 2 is displacement monitoring bar drawing in side sectional elevation；
Fig. 3 is surface cracks monitoring point for displacement arrangement schematic diagram；
Figure label: 1, straight-bar；2, fiber Bragg grating (FBG) demodulator；3, fiber grating displacement sensor；4, optical cable；5, steel wire
Rope；6, metal hanger.
Specific embodiment
Further explanation is done to the utility model with reference to the accompanying drawings and examples.
Fracture width monitoring system provided by the utility model includes: fiber grating displacement monitoring rod, fiber grating demodulation
Instrument 2.Fiber grating displacement monitoring rod includes straight-bar 1, fiber grating displacement sensor 3, metal hanger 6.Two fiber grating positions
Monitoring rod is moved to connect by wirerope 5, one end of wirerope 5 is connect with the bracing wire of fiber grating displacement sensor 3, the other end and
Straight-bar 1 connects, and fiber grating displacement sensor 3 and wirerope 5 are horizontal.Fiber grating displacement monitoring rod and fiber grating solution
Instrument 2 is adjusted to connect by optical cable 4, fiber Bragg grating (FBG) demodulator 2 sends laser signal to fiber grating displacement sensor 3, and laser is through light
Fine grating displacement sensor 3 returns to fiber Bragg grating (FBG) demodulator 2 after reflecting, fiber Bragg grating (FBG) demodulator 2 is to from fiber grating displacement
The reflected laser of sensor 3 carries out demodulation process, and obtains the wavelength signals of reflection laser, then calculates fiber grating
The displacement variable of displacement sensor 3.
Straight-bar 1 uses stainless steel material, diameter 3-7cm, length 30-150cm；Apart from 1 top 5cm positional symmetry of measuring staff
Arrange four connection end points, the fixed fiber grating displacement sensor 3 of one of endpoint, the fixed metal hanger 6 of the other three endpoint；
The tapered shape in 1 bottom end of straight-bar will be buried within the scope of below ground certain depth and concrete perfusion is fixed.
Fiber grating displacement sensor 3 is stay-supported, and length 30-50cm, testing range 0-15cm, measuring accuracy is
0.015cm.Anchoring section is fixed on straight-bar 1, and fiber grating displacement sensor 3 is perpendicular to straight-bar 1.
Metal hanger 6 uses stainless steel material, and length 3-5cm does not occur bending and deformation under external force, is connected to
The specified endpoint of straight-bar 1.
Wirerope 5, diameter 0.2-0.5cm connect Fiber Bragg Grating Displacement Sensor in two fiber grating displacement monitoring rods
Device 3 and metal hanger 6, have the characteristics that creep resistant, anti-corrosion, meet the requirement that crack measures for a long time.
2 multi-channel parallel of fiber Bragg grating (FBG) demodulator acquires optic fiber grating wavelength information, comprising: laser beam emitting device is used for
Generate laser beam；Laser input/output port, for laser to be output in transmission cable；Laser demodulating equipment, for demodulating
The laser signal reflected；Wireless data output port, for data information to be radioed to monitoring room or client；Data
Processing subsystem, as data processing and logic judgment unit, for dividing information related with sensor wavelength variation
Analysis and judgement, obtain the offset variable of fiber grating displacement sensor.
The installation method of straight-bar 1 is, will be straight by the drilling that drilling machine digging diameter is 15-30cm, depth is 15-75cm
The vertical concrete perfusion slurries after being put into drilling of bar 1, it is ensured that straight-bar 1 and tested Rock And Soil or concrete deformation are harmonious.Or
Straight-bar 1 is previously placed at the biggish region of deformation in person's works or structures work progress, as engineering construction is by straight-bar 1
It is fixed.
The distribution method of straight-bar 1 is in test section, and according to the extending direction of surface cracks, main laying form has two o'clock straight
Wire type is laid and 3 triangular forms are laid.
(1) two-point defined line formula is laid, it is characterized in that, two straight-bars 1 and the extending direction in crack are arranged vertically；It is straight by two
Bar 1 is fixed on crack disturbing influence region, measures relative displacement between two o'clock；Or a straight-bar 1 is arranged in crack disturbing influence
Region, another straight-bar cloth 1 are set outside the influence area of crack, and absolute displacement between two o'clock is measured.
(2) three triangular forms are laid, it is characterized in that, two straight-bars 1 are respectively arranged along perpendicular to fracture extension direction
Crack disturbing influence area fractures two sides, another straight-bar 1 are arranged in outside the influence area of crack, but this 3 points not straight at one
On line.
It is laid finally, being laid according to 1 two-point defined line formula of straight-bar with 3 triangular forms, calculates the moving distance of straight-bar 1.
(1) when 1 two-point defined line of straight-bar is laid, the calculation formula of relative displacement or absolute displacement between straight-bar 1 is Δ L
=L'-L.L and L' is respectively the fracture width variation amount of moving forward and backward for passing through fiber grating displacement sensor 3 and being measured in formula.
(2) when 1 three triangles of straight-bar are laid, two edges are respectively arranged crack disturbance shadow perpendicular to fracture extension direction
Ring B point, the C point of area fractures two sides, another A point being arranged in outside the influence area of crack, the then movement of B point and C point straight-bar 1
Amount is
In formulaB ' point, C ' point are respectively that B point, C point are straight
Point after the mobile variation of bar 1, BB ' and CC ' are respectively the amount of movement of B point and C point straight-bar 1, and a, b, c are respectively that triangular arrangement is straight
Distance between BC, AC, AB in bar 1, b ', c ' are respectively the length of AC ' and the length of AB '.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as the protection scope of the utility model.
Claims (6)
1. the fracture width based on Fiber Bragg Grating technology monitors system, which is characterized in that including fiber grating displacement monitoring rod, light
Fine grating demodulation instrument；The stay-supported optical fiber grating displacement that the fiber grating displacement monitoring rod includes straight-bar, is mounted on straight-bar
Sensor；Two fiber grating displacement monitoring rods are connected by wirerope, one end of wirerope and fiber grating displacement sensor
Bracing wire connection, the other end connect with straight-bar；Fiber grating displacement sensor is connected with fiber Bragg grating (FBG) demodulator by optical cable.
2. the fracture width according to claim 1 based on Fiber Bragg Grating technology monitors system, which is characterized in that the light
Fine pattern displacement monitoring rod at least two are separately mounted to crack two sides, the lines of two fiber grating displacement monitoring rods perpendicular to
Fracture extension direction, and wherein at least one fiber grating displacement monitoring rod is installed on crack disturbing influence region；The straight-bar
It is vertical to assign into the Rock And Soil of crack side and consistent with Rock And Soil compatibility of deformation.
3. the fracture width according to claim 2 based on Fiber Bragg Grating technology monitors system, which is characterized in that the light
Fine pattern displacement monitoring rod has two, crack disturbing influence region is each attached to, to measure relative shift between two o'clock.
4. the fracture width according to claim 2 based on Fiber Bragg Grating technology monitors system, which is characterized in that the light
Fine pattern displacement monitoring rod has two, and one is arranged in crack disturbing influence region, and another is arranged in outside the influence area of crack,
To measure stratum absolute displacement amount.
5. the fracture width according to claim 2 based on Fiber Bragg Grating technology monitors system, which is characterized in that the light
Fine pattern displacement monitoring rod has three, and two edges are respectively arranged crack disturbing influence area fractures two perpendicular to fracture extension direction
Side, in addition one is arranged in outside the influence area of crack, and three straight-bars are not arranged on the same straight line.
6. -5 any fracture widths based on Fiber Bragg Grating technology monitor system according to claim 1, which is characterized in that
The fiber grating displacement sensor and wirerope are horizontal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822153896.3U CN209055073U (en) | 2018-12-21 | 2018-12-21 | Crack width monitoring system based on fiber grating technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822153896.3U CN209055073U (en) | 2018-12-21 | 2018-12-21 | Crack width monitoring system based on fiber grating technology |
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| Publication Number | Publication Date |
|---|---|
| CN209055073U true CN209055073U (en) | 2019-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822153896.3U Expired - Fee Related CN209055073U (en) | 2018-12-21 | 2018-12-21 | Crack width monitoring system based on fiber grating technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109556524A (en) * | 2018-12-21 | 2019-04-02 | 中国矿业大学 | Crack width monitoring system and method based on fiber grating technology |
| CN113295843A (en) * | 2021-04-08 | 2021-08-24 | 山东科技大学 | Monitoring device for mining ground crack of shallow coal seam |
| CN113739661A (en) * | 2021-08-24 | 2021-12-03 | 同济大学 | Measuring scale and method for detecting surface cracks of component |
-
2018
- 2018-12-21 CN CN201822153896.3U patent/CN209055073U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109556524A (en) * | 2018-12-21 | 2019-04-02 | 中国矿业大学 | Crack width monitoring system and method based on fiber grating technology |
| CN113295843A (en) * | 2021-04-08 | 2021-08-24 | 山东科技大学 | Monitoring device for mining ground crack of shallow coal seam |
| CN113295843B (en) * | 2021-04-08 | 2023-02-28 | 山东科技大学 | Monitoring device for mining ground crack of shallow coal seam |
| CN113739661A (en) * | 2021-08-24 | 2021-12-03 | 同济大学 | Measuring scale and method for detecting surface cracks of component |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190702 Termination date: 20211221 |