CN208606916U - Fiber Bragg grating type drag-line cable force monitoring sensor based on frequency method - Google Patents
Fiber Bragg grating type drag-line cable force monitoring sensor based on frequency method Download PDFInfo
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- CN208606916U CN208606916U CN201820698303.9U CN201820698303U CN208606916U CN 208606916 U CN208606916 U CN 208606916U CN 201820698303 U CN201820698303 U CN 201820698303U CN 208606916 U CN208606916 U CN 208606916U
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Abstract
The utility model relates to the fiber Bragg grating type drag-line cable force monitoring sensors based on frequency method, fiber Bragg grating type drag-line cable force monitoring sensor uses fiber Bragg grating type acceleration transducer, the fiber Bragg grating type acceleration transducer is formed by carving grating, fiber-optic signal outlet, cantilever arrangement and mass block in optical fiber, grating is carved in optical fiber to fix by cantilever arrangement level, and both ends extend to form fiber pigtail, it is drawn by the symmetrically arranged fiber-optic signal outlet in both ends, one end of cantilever arrangement is fixed with mass block by stop screw；Fiber Bragg grating type drag-line cable force monitoring sensor is mounted on drag-line surface by base used specially and stop screw, to capture inhaul cable vibration signal, and is equipped with Special visible application software, forms a set of long-term on-line monitoring system.The utility model has the advantages of convenient installation, adapts in complex environment and distant signal transmission, data stability is fine.
Description
[technical field]
The utility model relates to flexible cable load-bearing monitor technical field in civil engineering structure, a kind of specifically base
In the fiber Bragg grating type drag-line cable force monitoring sensor of frequency method.
[background technique]
Drag-line is the tensional element in structure, is the important composition portion of large span spatial structure, suspended-cable structure, slant-pull structure
Point.Drag-line is usually formed with high tensile steel wire twisting, can be divided into steel strand wires, steel tendon and wirerope, and both ends are solid using dedicated anchor head
It is fixed.
After structure drag-line is runed for a long time, Suo Li state need to be monitored, first is that judging that monitored Cable power is
No to be in safe work state, drag-line fails caused by the diseases such as early warning is because overloading, drag-line corrodes, anchor head corrosion, so as to timely
Handle measure is taken, guarantees safety；Second is that carrying out comprehensive analysis according to the Cable force data monitored, drag-line knot is corrected
Structure design parameter and inspection construction are pre-designed, it is ensured that the reasonability and economy of stayed structure design and construction.
For the cable force monitoring of structure drag-line, conventional method is in drag-line construction period, in the position integrated installation of anchorage
Compression chord formula cable tension sensor, once after stayed structure stretching construction, it can not install additional or replace in the bridge operation phase, it is special
Be not do not consider the construction stage installation stayed structure, it is subsequent also can not again removing anchorage device, install additional stress-type cable tension sensor.But
The fiber Bragg grating type cable tension sensor test method of this utility model is the frequency method test Cable based on Chord vibration theory
Power under the premise of not generating any damage to stayed structure without processes such as overhaul, disassemblies, can adopt during subsequent operation
Suo Li can be monitored by being installed on Cable body surface face with base used specially stickup.
[summary of the invention]
The purpose of this utility model is for there are no installed additional in the structure operation phase to be used for for a long time in real time currently on the market
The solution of monitoring, and designing one kind can the good fiber Bragg grating type sensor for carrying out drag-line cable force monitoring.
A kind of fiber Bragg grating type drag-line cable force monitoring sensor based on frequency method, which is characterized in that fiber Bragg grating type is drawn
Cable force monitors sensor and uses fiber Bragg grating type acceleration transducer, and the fiber Bragg grating type acceleration transducer is by optical fiber
It carves grating 1, fiber-optic signal outlet 2, cantilever arrangement 3 and mass block 4 to form, it is horizontal by cantilever arrangement 3 that grating 1 is carved in optical fiber
It is fixed, and both ends extend to form fiber pigtail, are drawn by the symmetrically arranged fiber-optic signal outlet 2 in both ends, cantilever arrangement 3
One end mass block 4 is fixed with by stop screw 5；Fiber Bragg grating type drag-line cable force monitoring sensor passes through base used specially and limit
Position screw is mounted on drag-line surface, to capture inhaul cable vibration signal, and is equipped with Special visible application software, is formed a set of long-term
On-line monitoring system.
Fiber Bragg grating type drag-line cable force monitoring sensor is installed on the midpoint in Cable body length direction, base used specially
For L shape, fiber Bragg grating type drag-line cable force monitoring sensor is fixed in mounting seat by 4 M3 screws, on the downside of mounting seat
Have the mounting hole of 2 7mm diameters, can be used for sensor integral locking, rear base long side position it is directly viscous using solid gum
It is affixed on Cable body surface face.
Fiber pigtail can random spreading, convenient for remotely reading sensing data using high frequency fiber Bragg grating type (FBG) demodulator,
The signal of sensor is drawn using tail optical fiber, multiple sensors can be used optical fiber depending on different wavelength range and connect, serial number
Amount should not be more than 6, and ordinary optic fibre is recycled to carry out spreading, lead to monitoring device.
The utility model has the advantage that built-in sensors volume compared with other principles test sensing technology in industry
Small, waterproof, corrosion-resistant, electrical insulation capability is good, anti-electromagnetic interference capability is strong, and overall volume is smaller after tooling, easy for installation, can fit
Should be in complex environment and distant signal transmission, data stability is fine, can run the phase in structure based on frequency method and add cloth
It sets.
[Detailed description of the invention]
Fig. 1 is the structure front elevation of the utility model；
Fig. 2 is the texture edge figure of the utility model；
Fig. 3 is the pedestal detail drawing of the utility model；
Fig. 4 is the frequency demarcating result of the utility model；
Specified Figure of abstract of the Fig. 1 as the utility model.
Description of symbols in figure:
Grating, 2 fiber-optic signal outlets, 3 cantilever arrangements, 4 mass blocks, 5 stop screws, 6L shape pedestal are carved in 1 optical fiber.
[specific embodiment]
The utility model is described in further detail with reference to the accompanying drawing, and specific embodiment described herein is only used to solve
The utility model is released, is not used to limit the utility model.
Embodiment 1
The basic fundamental thinking of the utility model is that fiber Bragg grating type cable tension sensor is mounted on drawing by base used specially
To capture inhaul cable vibration signal, the vibration characteristics and stress size of monitoring analysis drag-line form a set of long-term online prison on rope surface
Examining system.
(1) installation of Suo Liji: fiber Bragg grating type cable tension sensor is installed on the midpoint in Cable body length direction,
Base used specially is L shape, and cable tension sensor first is fixed in mounting seat by 4 M3 screws, has 2 on the downside of mounting seat
The mounting hole of 7mm diameter can be used for sensor integral locking, rear base long side position be directly adhered to draw using solid gum
Rustling sound body surface face.Accelerometer, which outranges, is easy to cause damage, so necessarily being in locking shape installing front limit screw
State, i.e., by the locking of sensor internal mass block make cantilever beam will not arbitrary deformation, and accelerometer to be enabled to work, it is necessary to will limit
Screw unscrews (rotation counterclockwise) 2~3 circle.There are measurement directions for accelerometer, and acceleration of gravity direction is tested when upright, is lain low
When testing level direction.The measurement direction of this specification product is vertical with fiber direction.
(2) line arrangement of Suo Liji: the signal of sensor is drawn using tail optical fiber, multiple sensors regard different wave length model
Enclosing can be used optical fiber and connects, and serial number should not be more than 6, recycle that ordinary optic fibre carries out spreading, lead to monitoring is set
It is standby.
(3) Suo Li counts monitoring:, can be simultaneously to multiple Suo Li using multi-channel fiber Bragg grating (FBG) demodulator in monitoring room
Photometric grid variable signal carries out demodulation analysis, and the program based on Fourier transform principle exploitation can be automatically analyzed by time-domain signal
Inhaul cable vibration characteristic, and it is specially equipped with visualizing application software, set of system is formed to monitor the force-bearing situation of drag-line.It surveys
Method for testing is based on frequency method, and drag-line can regard a Chord vibration as, be changed according to its both ends stress with the relationship of intrinsic frequency
Calculation obtains a kind of indirect measurement method of Suo Li, installs additional and adds to monitor Cable power in the operation phase suitable for old bridge.
In order to ensure Suo Li counts good working performance, designed cable tension sensor is tested under lab
Calibration.Since Suo Li counts main test vibration signal, when Laboratory Calibration on a vibration table by the installation of Suo Li meter, shake table is used
Standard signal source motivates Suo Li meter, is then compared with Suo Liji measured result.Comparison result shows Suo Li
It is fine in respect of linear and Repeatability in effect frequency domain section, illustrate that the design can satisfy actual operation requirements.
The utility model uses in certain structure Cable power monitoring works, is mounted with 20 such Suo Li in engineering altogether
Meter, in-site installation is easy, and sensing data realizes long-term long-range monitoring, has been truly reflected the change of structure operation state Cable power
Change situation, data precision is high, and stability is good, can satisfy engineering demand.
Principle is the cantilever arrangement that end sets a mass block inside fiber Bragg grating type cable tension sensor, and the top surface of cantilever beam is viscous
Test gratings are pasted, when mass block vibrates down, grating is elongated, and is measured lightwave signal wavelength and is become larger, when mass block up shakes
When dynamic, grating is compressed, and is measured lightwave signal wavelength and is become smaller, and when mass block reciprocating motion, then it is bent can to measure wavelength change time-histories
Line is fourier transformed analysis, can be obtained frequency-domain result.The cable tension sensor that stickup is mounted on Cable body surface face can lead to
Cross the self-vibration characteristic of above-mentioned principle test drag-line.
Cable tension sensor operating temperature is preferably -30 DEG C~80 DEG C, and raster center wavelength is 1510nm~1590nm, and frequency is rung
Answering range is 1Hz~40Hz, and Suo Li precision can reach 0.1KN.
It necessarily is in locking state installing front limit screw, i.e., the locking of sensor internal mass block is made into cantilever beam
Will not arbitrary deformation, and accelerometer to be enabled to work, it is necessary to which stop screw is unscrewed (rotation counterclockwise) 2~3 circle, accelerometer
There are measurement directions, and acceleration of gravity direction, testing level direction when lying low, the measurement direction of this specification product are tested when upright
It is vertical with fiber direction.
Claims (3)
1. a kind of fiber Bragg grating type drag-line cable force monitoring sensor based on frequency method, which is characterized in that fiber Bragg grating type drag-line
Cable force monitoring sensor uses fiber Bragg grating type acceleration transducer, and the fiber Bragg grating type acceleration transducer in optical fiber by carving
Grating (1), fiber-optic signal outlet (2), cantilever arrangement (3) and mass block (4) composition, interior carve grating (1) of optical fiber pass through cantilever
Device (3) is horizontal fixed, and both ends extend to form fiber pigtail, pass through the symmetrically arranged fiber-optic signal outlet (2) in both ends
It draws, one end of cantilever arrangement (3) is fixed with mass block (4) by stop screw (5)；Fiber Bragg grating type drag-line cable force monitoring passes
Sensor is mounted on drag-line surface by base used specially and stop screw.
2. a kind of fiber Bragg grating type drag-line cable force monitoring sensor based on frequency method as described in claim 1, feature exist
In fiber Bragg grating type drag-line cable force monitoring sensor is installed on the midpoint in Cable body length direction, base used specially L
Shape, fiber Bragg grating type drag-line cable force monitoring sensor are fixed in mounting seat by 4 M3 screws, are had on the downside of mounting seat
The mounting hole of 2 7mm diameters can be used for sensor integral locking, rear base long side position directly pasted using solid gum
In Cable body surface face.
3. a kind of fiber Bragg grating type drag-line cable force monitoring sensor based on frequency method as described in claim 1, feature exist
In, fiber pigtail can random spreading convenient for remotely reading sensing data using high frequency fiber Bragg grating type (FBG) demodulator utilize tail
Fibre draws the signal of sensor, and multiple sensors can be used optical fiber depending on different wavelength range and connect, and serial number is unsuitable
More than 6, ordinary optic fibre is recycled to carry out spreading, lead to monitoring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820698303.9U CN208606916U (en) | 2018-05-11 | 2018-05-11 | Fiber Bragg grating type drag-line cable force monitoring sensor based on frequency method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820698303.9U CN208606916U (en) | 2018-05-11 | 2018-05-11 | Fiber Bragg grating type drag-line cable force monitoring sensor based on frequency method |
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| CN208606916U true CN208606916U (en) | 2019-03-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110424227A (en) * | 2019-07-16 | 2019-11-08 | 湖北省城建设计院股份有限公司 | Mat formation the optical fiber sensing system of surface layer water permeability for assessing sponge urban water-through |
-
2018
- 2018-05-11 CN CN201820698303.9U patent/CN208606916U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110424227A (en) * | 2019-07-16 | 2019-11-08 | 湖北省城建设计院股份有限公司 | Mat formation the optical fiber sensing system of surface layer water permeability for assessing sponge urban water-through |
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Address after: 200032 1st floor, 75 Wanping South Road, Xuhui District, Shanghai Patentee after: SHANGHAI BUILDING SCIENCE RESEARCH INSTITUTE Co.,Ltd. Address before: 200032 1st floor, 75 Wanping South Road, Xuhui District, Shanghai Patentee before: SHANGHAI Research Institute OF BUILDING SCIENCES |
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| TR01 | Transfer of patent right |
Effective date of registration: 20230627 Address after: Room 1601, 238 JIANGCHANG Third Road, Jing'an District, Shanghai 200436 Patentee after: Shanghai Jianke Digital Innovation Intelligent Technology Co.,Ltd. Address before: 200032 1st floor, 75 Wanping South Road, Xuhui District, Shanghai Patentee before: SHANGHAI BUILDING SCIENCE RESEARCH INSTITUTE Co.,Ltd. |