CN110132160A - A kind of Measurement Methods Of Bridge Deflection using optical fiber source - Google Patents
A kind of Measurement Methods Of Bridge Deflection using optical fiber source Download PDFInfo
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- CN110132160A CN110132160A CN201910531456.3A CN201910531456A CN110132160A CN 110132160 A CN110132160 A CN 110132160A CN 201910531456 A CN201910531456 A CN 201910531456A CN 110132160 A CN110132160 A CN 110132160A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 60
- 238000000691 measurement method Methods 0.000 title claims abstract description 9
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 239000004065 semiconductor Substances 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 4
- 230000003447 ipsilateral effect Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 13
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 23
- 230000008859 change Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/167—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by projecting a pattern on the object
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
A kind of Measurement Methods Of Bridge Deflection using optical fiber source, it is related to deflection of bridge span detection technique field, light-reflecting components are installed on to the measured point of bridge bottom, single mode optical fiber light source emitter and light spot image receiving end are installed at the ground below bridge or on bridge pier；The single mode optical fiber light source emitter emits laser and after light-reflecting components reflects, and most receives afterwards through light spot image receiving end；Light beam that single mode optical fiber light source emitter emits to light-reflecting components and ground level angle are set as α, it is h that the light-reflecting components for being attached to bridge bottom are displaced in vertical direction, then after light-reflecting components reflect, beam center point is displaced in the plane vertical with reflected light pass direction is for the relational expression of d, d and hH value, i.e. deflection of bridge span value can be calculated by above formula.Easy to operate, measurement result is accurate, can provide condition for the building remote Multi-point deflection real time on-line monitoring of bridge.
Description
Technical field
The present invention relates to deflection of bridge span detection technique field more particularly to a kind of bridge deflection measurements using optical fiber source
Method.
Background technique
Bridge is the important component in traffic system, structure security relationship socio-economic development and people's person
Safety.The deflection data of its Bridge plays an important role for the health evaluating of bridge structure, can be straight by deflection data
Deformation situation of the ground reflection bridge under the external forces such as temperature and humidity, load, wind-force is seen, the bearing capacity of bridge, stress are damaged
Lose etc. also plays scale effect, also has directive function [1] to the maintenance work of bridge.
The method of measurement deflection of bridge span more commonly used at present has following several: (1) total station method [2]: this method utilizes three
Measurement of higher degree principle in angle places prism in bridge position to be measured, through measurement bridge before and after load between prism and total station
The variation of elevation angle calculate deflection value, this method needs using expensive total station, and reflecting prism and reception
End distance farther out when, spot size is larger, not can guarantee the measurement range and precision of amount of deflection；(2) inclinator method [3]: this method is
Inclinator is arranged at each position in bridge bottom, is constructed when deformation occurs for bridge by the collected inclination data in each position
The change of pitch angle curve of bed rearrangement bridge, to obtain the amount of deflection change curve of bridge, this method needs are arranged multiple on bridge
High-precision inclinometer is more difficult to get result when bridge inclination angle is smaller；(3) communicating pipe Dow process [4]: this method selects bridge both sides bridge
Pier is datum mark, default benchmark point height not with deflection of bridge span change and change, then between two datum marks every
Certain distance is laid with pipeline, and the variation by measuring liquid level height obtains deflection of bridge span numerical value, and this method can only measure bridge
Natural bow, be unable to measure bridge dynamic deflection；In addition, it is necessary to which the liquid in communicating pipe is not it is difficult to ensure that have when doing long term monitoring
It reduces；(4) dial gauge method [5]: this method is rotated using gear and amplifies the displacement signal of bridge, while will be in vertical direction
Change in displacement be changed into the angle rotation of pointer, deflection of bridge span is measured with this, this method usually requires manually to read, separately
Outside, measuring instrument can not be installed by bracket in many scenes；(5) GPS positioning method: this method is to install multi-section GPS locator
On each position of bridge, then a GPS locator is set in fixed base point as reference coordinate, is connect according to GPS receiver
The satellite positioning information received establishes the three-dimensional coordinate of bridge, its amount of deflection is asked to change, that there are precision is limited for this method, response when
Between relatively slow, higher cost the problems such as.
With the progress of image detection and processing technique, constantly have in recent years using photoelectric image method detection deflection of bridge span
It reports [6].Semiconductor emission light source usually is installed in bridge bottom when this method is implemented, in bridge pier or ground image sensing
The movement of device detection launch point hot spot；Can also will transmitting light be mounted on bridge pier or ground, bridge bottom install reflecting mirror or
It can show the target surface of hot spot, detection reflects or the hot spot on target surface is mobile.
Due to the photosensitive area usually only centimetres of imaging sensor, when bridge bottom deflection monitoring point connects with image
When receiving device distance farther out, reflecting or be incident upon the spot size on target surface from reflecting mirror can become very big, it is difficult to which satisfaction is scratched
Spend the requirement of measurement range and precision.On the other hand, directly from the light beam of semiconductor laser, hot spot is in lateral point
Cloth vulnerable to laser works state influence and change, for example, variation and the laser of laser cross mode
Environment temperature or operating temperature rise are likely to cause laser and the relative displacement of collimated system, and imaging sensor is caused to receive
The facula position arrived is mobile, causes measurement error.
Summary of the invention
It is an object of the invention to solve the above problem in the prior art, provides and a kind of scratched using the bridge of optical fiber source
Measurement method is spent, easy to operate, measurement result is accurate, can provide item for the building remote Multi-point deflection real time on-line monitoring of bridge
Part.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
A kind of bridge deflection measurement system using optical fiber source, including single mode optical fiber light source emitter, photo-emission part
Part and light spot image receiving end, the light-reflecting components are installed on the measured point of bridge bottom, the single mode optical fiber light source transmitting
Device and light spot image receiving end are installed at the ground below bridge or on bridge pier, wherein the single mode optical fiber light source transmitting
Device is for emitting laser and most receiving afterwards through light spot image receiving end after light-reflecting components reflect.
The single mode optical fiber light source emitter includes the laser, single mode optical fiber and collimation lens set gradually, described
The output end of the output end of the input terminal connecting laser of single mode optical fiber, single mode optical fiber corresponds to the center of collimation lens, single mode
The operation wavelength of optical fiber and laser it is Wavelength matched so that light wave is transmitted in single mode optical fiber with basic mode.
The laser uses semiconductor laser, solid state laser, gas laser or optical fiber laser.
In a technical solution, the light-reflecting components use plane mirror, the single mode optical fiber light source emitter
Positioned at the side on ground below plane mirror, light spot image receiving end is located at the other side on ground below plane mirror.
In another technical solution, the light-reflecting components use corner cube mirror, the single mode optical fiber light source transmitting dress
It sets and is installed on bridge pier with the ipsilateral setting in light spot image receiving end.
Using a kind of above-mentioned method of the bridge deflection measurement systematic survey deflection of bridge span using optical fiber source, single mode is set
The light beam and ground level angle that optical fiber source emitter emits to light-reflecting components are α, are attached to the photo-emission part of bridge bottom
Part is h in vertical direction displacement, then after light-reflecting components reflect, beam center point is put down in vertical with reflected light pass direction
Displacement is the relational expression of d, d and h on face are as follows:
H value, i.e. deflection of bridge span value can be calculated by above formula.
Compared with the existing technology, the beneficial effect that technical solution of the present invention obtains is:
The present invention using single mode optical fiber light source emitter as bridge moving, the light source of static deflection photodetector system,
Measurement result is accurate, thoroughly solves using semiconductor or other type lasers as transmitting light source spot size that may be present
The bad problem with stability.Meanwhile single mode optical fiber lead can be very long, single mode optical fiber transmitting terminal can pass through without power supply
Optical signal is divided into multichannel while emitted by optical splitter, therefore the present invention can exist in real time for the building remote Multi-point deflection of bridge
Line monitors offer condition.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention 1；
Fig. 2 is the structural schematic diagram of the embodiment of the present invention 2；
Fig. 3 is the structural schematic diagram of single mode optical fiber light source emitter.
Specific embodiment
In order to be clearer and more clear technical problems, technical solutions and advantages to be solved, tie below
Drawings and examples are closed, the present invention is described in further details.
There is following two scheme according to the difference of fibre optical transmission and receiving end installation site.
Embodiment 1
As shown in Figure 1, the embodiment of the present invention 1 includes single mode optical fiber light source emitter, light-reflecting components and light spot image
Receiving end；
The light-reflecting components use plane mirror, and the measured point that the plane mirror is installed on bridge bottom is (logical
Often selection is in the maximum span centre position of deflection of bridge span), the single mode optical fiber light source emitter is fixed below plane mirror
The side on ground adjusts the launch angle of single mode optical fiber light source emitter, issues single mode optical fiber light source emitter sharp
Light is emitted to other side ground by plane mirror, then installs light spot image receiving end in light beam position.
As shown in figure 3, the single mode optical fiber light source emitter includes the laser, single mode optical fiber and collimation set gradually
Lens, the output end of the input terminal connecting laser of the single mode optical fiber, the output end of single mode optical fiber are corresponding to collimation lens just
Center, the operation wavelength of single mode optical fiber and laser it is Wavelength matched so that light wave is transmitted in single mode optical fiber with basic mode.
In the present invention, according to the wavelength of laser, suitable single mode optical fiber is selected to make under operation wavelength light wave in single-mode optics
Basic mode transmits in fibre, and transverse direction field distribution is approximately Gaussian function when such light wave is emitted from fiber end face；Through adjusting single mode optical fiber
End face to the distance of collimation lens, light beam can be made minimum in light spot image receiving plane size.
Semiconductor laser, solid state laser, gas laser or optical fiber laser can be used in the laser.
Embodiment 2
For the application scenarios in ground light source transmitting and receiving end not easy to install, following technical solution can be used:
As shown in Fig. 2, the embodiment of the present invention 2 includes single mode optical fiber light source emitter, light-reflecting components and light spot image
Receiving end；
The single mode optical fiber light source emitter and embodiment 1 are identical, and the light-reflecting components use corner cube mirror, institute
State the measured point (being usually chosen in the maximum span centre position of deflection of bridge span) that corner cube mirror is installed on bridge bottom, the single mode
The ipsilateral setting of optical fiber source emitter and light spot image receiving end is installed on bridge pier, so that incident beam original direction returns.
Method using Example 1 and Example 2 of the present invention measurement deflection of bridge span is as follows:
Light beam that single mode optical fiber light source emitter emits to light-reflecting components and ground level angle are set as α, is attached to bridge
The light-reflecting components in beam bottom portion vertical direction displacement be h, then after light-reflecting components reflect, beam center point with reflected light
Displacement is the relational expression of d, d and h in the vertical plane of transmission direction are as follows:
H value, i.e. deflection of bridge span value can be calculated by above formula.
Claims (5)
1. a kind of Measurement Methods Of Bridge Deflection using optical fiber source, it is characterised in that: light-reflecting components are installed on bridge bottom
The measured point in portion, single mode optical fiber light source emitter and light spot image receiving end are installed at the ground below bridge or bridge pier
On；The single mode optical fiber light source emitter emits laser and after light-reflecting components reflects, most afterwards through light spot image receiving end
It receives；Light beam that single mode optical fiber light source emitter emits to light-reflecting components and ground level angle are set as α, is attached to bridge bottom
The light-reflecting components in portion vertical direction displacement be h, then after light-reflecting components reflect, beam center point with reflected light pass
Displacement is the relational expression of d, d and h in the vertical plane in direction are as follows:
H value, i.e. deflection of bridge span value can be calculated by above formula.
2. a kind of Measurement Methods Of Bridge Deflection using optical fiber source as described in claim 1, it is characterised in that: the single-mode optics
Fibre source emitter includes the laser, single mode optical fiber and collimation lens set gradually, and the input terminal of the single mode optical fiber connects
Connect the output end of laser, the output end of single mode optical fiber corresponds to the center of collimation lens, the operation wavelength of single mode optical fiber and swashs
Light device it is Wavelength matched so that light wave is transmitted in single mode optical fiber with basic mode.
3. a kind of Measurement Methods Of Bridge Deflection using optical fiber source as claimed in claim 2, it is characterised in that: the laser
Using semiconductor laser, solid state laser, gas laser or optical fiber laser.
4. a kind of Measurement Methods Of Bridge Deflection using optical fiber source as described in claim 1, it is characterised in that: the light reflection
Component uses plane mirror, and the single mode optical fiber light source emitter is installed on the side on ground below plane mirror, light
Spot image receiving end is installed on the other side on ground below plane mirror.
5. a kind of Measurement Methods Of Bridge Deflection using optical fiber source as described in claim 1, it is characterised in that: the light reflection
Component is corner cube mirror, and the ipsilateral setting of the single mode optical fiber light source emitter and light spot image receiving end is installed on bridge pier
On.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910531456.3A CN110132160B (en) | 2019-06-19 | 2019-06-19 | Bridge deflection measuring method adopting optical fiber light source |
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| CN201910531456.3A CN110132160B (en) | 2019-06-19 | 2019-06-19 | Bridge deflection measuring method adopting optical fiber light source |
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| CN110132160B CN110132160B (en) | 2024-03-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829783A (en) * | 2019-11-15 | 2020-02-21 | 安徽同兴科技发展有限责任公司 | Constant-speed permanent magnet synchronous linear motor and response equation derivation method thereof |
| CN111156904A (en) * | 2019-12-30 | 2020-05-15 | 浙江大学 | Non-contact bridge displacement sensing method based on flexible photoelectric sensing array |
| CN115183962A (en) * | 2022-07-11 | 2022-10-14 | 深圳大学 | Bridge deflection laser measuring method and system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829783A (en) * | 2019-11-15 | 2020-02-21 | 安徽同兴科技发展有限责任公司 | Constant-speed permanent magnet synchronous linear motor and response equation derivation method thereof |
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| CN111156904A (en) * | 2019-12-30 | 2020-05-15 | 浙江大学 | Non-contact bridge displacement sensing method based on flexible photoelectric sensing array |
| CN111156904B (en) * | 2019-12-30 | 2020-10-30 | 浙江大学 | Non-contact bridge displacement sensing method based on flexible photoelectric sensing array |
| CN115183962A (en) * | 2022-07-11 | 2022-10-14 | 深圳大学 | Bridge deflection laser measuring method and system |
| CN115183962B (en) * | 2022-07-11 | 2023-03-10 | 深圳大学 | Laser measurement method and system for bridge deflection |
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