CN210004967U - bridge deflection measuring system adopting optical fiber light source - Google Patents
bridge deflection measuring system adopting optical fiber light source Download PDFInfo
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- CN210004967U CN210004967U CN201920927363.8U CN201920927363U CN210004967U CN 210004967 U CN210004967 U CN 210004967U CN 201920927363 U CN201920927363 U CN 201920927363U CN 210004967 U CN210004967 U CN 210004967U
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Abstract
bridge deflection measuring system using optical fiber light source, relates to bridge deflection detecting technology field, including single mode optical fiber light source emitting device, light reflection component and facula image receiving end, the light reflection component is installed at the measured point of the bridge bottom, the single mode optical fiber light source emitting device and facula image receiving end are installed at the ground or on the bridge pier under the bridge, wherein, the single mode optical fiber light source emitting device is used to emit laser and receive by the facula image receiving end after reflected by the light reflection component, the single mode optical fiber light source emitting device includes the laser, single mode optical fiber and collimating lens which are set in turn, the input end of the single mode optical fiber is connected with the output end of the laser, the output end of the single mode optical fiber corresponds to the center of the collimating lens, the working wavelength of the single mode optical fiber matches with the wavelength of the laser, so that the light wave is transmitted in the single mode optical fiber by the fundamental mode, the structure is simple, the measuring result.
Description
Technical Field
The utility model relates to a bridge amount of deflection detects technical field, especially relates to bridge amount of deflection measurement systems who adopts fiber optic light source.
Background
The bridge is an important component in a traffic system, and the structural safety of the bridge is related to social and economic development and personal safety of people. The deflection data of the bridge plays an important role in health assessment of the bridge structure, the deformation condition of the bridge under the action of external forces such as temperature, humidity, load, wind power and the like can be intuitively reflected through the deflection data, the deflection data also plays a scale role in the aspects of bearing capacity, stress loss and the like of the bridge, and the deflection data also has a guiding effect on maintenance work of the bridge [1 ].
A method for measuring bridge deflection commonly used at present comprises the following steps of (1) a total station method [2] which uses a triangle elevation measurement principle to place a prism at a position to be measured of a bridge and calculates a deflection value by measuring the change of a height angle between the prism and the total station before and after loading the bridge, the method needs to use a high-price total station, when a reflecting prism is far away from a receiving end, the light spot size is large, the measurement range and the deflection precision cannot be guaranteed, (2) an inclinometer method [3] which arranges inclinometers at each position of the bottom of the bridge, when the bridge deforms, inclination angle data collected by each position are used for constructing an inclination angle change curve of the whole bridge, the deflection change curve of the bridge is obtained, the method needs to arrange a plurality of high-precision inclinometers on the bridge, when the inclination angle of the bridge is small, results are difficult to obtain, and (3) a pipeline connecting method [4] which selects two sides of the bridge as measurement datum points, defaults do not change along with the deflection change of the deflection of the bridge, then pipelines are laid at intervals of , pipelines are difficult to obtain results through a high-precision measurement coordinate reading method, a method which only needs to use a GPS positioning liquid level gauge to be used for measuring a GPS positioning instrument, the bridge, the method needs to obtain a constant-point, the displacement measuring method only needs to obtain a constant-point of a constant-point, a GPS positioning liquid-point measuring method, a GPS positioning instrument, a constant-point measuring method, a method which only needs to obtain a constant-point measuring method, a constant-point measuring method which needs to obtain a constant-point measuring method, a method which only needs to measure deflection-point measuring method which only needs to use a constant-.
With the progress of image detection and processing technology, reports of detecting bridge deflection by adopting a photoelectric image method are continuously reported in recent years [6 ]. When the method is implemented, a semiconductor emitting light source is usually arranged at the bottom of a bridge, and an image sensor is used for detecting the movement of light spots of an emitting point at a bridge pier or the ground; the emitted light can also be arranged on a pier or the ground, a reflector or a target surface capable of displaying the light spot is arranged at the bottom of the bridge, and the light spot movement reflected back or on the target surface is detected.
In addition, , the transverse distribution of the light spot of the light beam directly emitted from the semiconductor laser is easily affected by the working state of the laser, for example, the change of the transverse oscillation mode of the laser and the environmental temperature or the working temperature rise of the laser may cause the relative displacement of the laser and the lens collimation system, which causes the position movement of the light spot received by the image sensor, resulting in measurement errors.
Disclosure of Invention
An object of the utility model is to solve the above-mentioned problem among the prior art, provide kinds of bridge amount of deflection measurement systems that adopt optic fibre light source, simple structure, measuring result is accurate, can provide the condition for the real-time on-line monitoring of the remote multiple spot amount of deflection of construction bridge.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
bridge deflection measurement system using optical fiber light source, comprising a single mode optical fiber light source emission device, a light reflection component and a facula image receiving end, wherein the light reflection component is installed at the measured point at the bottom of the bridge, the single mode optical fiber light source emission device and the facula image receiving end are installed at the ground or on the bridge pier below the bridge, the single mode optical fiber light source emission device is used for emitting laser, and the laser is reflected by the light reflection component and then received by the facula image receiving end.
The single mode fiber light source transmitting device comprises a laser, a single mode fiber and a collimating lens which are sequentially arranged, the input end of the single mode fiber is connected with the output end of the laser, the output end of the single mode fiber corresponds to the positive center of the collimating lens, and the working wavelength of the single mode fiber is matched with the wavelength of the laser so that light waves are transmitted in the single mode fiber in a fundamental mode.
The laser adopts a semiconductor laser, a solid laser, a gas laser or a fiber laser.
In the technical solution, the light reflection component employs a plane mirror, the single-mode fiber light source emitting device is located at side of the ground below the plane mirror, and the light spot image receiving end is located at another side of the ground below the plane mirror.
In another technical solution, the light reflection component employs a right-angle reflector, and the single-mode fiber light source emitting device and the light spot image receiving end are installed on the same side of the bridge pier.
The methods for measuring the bridge deflection by the bridge deflection measuring system adopting the optical fiber light source set the included angle between the light beam emitted by the single-mode optical fiber light source emitting device to the light reflection component and the ground plane to be α, the displacement of the light reflection component attached to the bottom of the bridge in the vertical direction is h, after the light reflection component reflects the light beam, the displacement of the central point of the light beam on the plane vertical to the transmission direction of the reflected light is d, and the relational expression between d and h is as follows:
the h value, i.e. the bridge deflection value, can be calculated by the above formula.
Compared with the prior art, the utility model discloses technical scheme obtains beneficial effect is:
the utility model discloses a single mode fiber light source emitter moves as the bridge, static amount of deflection photoelectric detection system's light source, and measuring result is accurate, thoroughly solves the facula size and the not good problem of stability that adopts semiconductor or other type lasers to probably exist as the transmitting light source. Simultaneously, the single mode fiber lead wire can be very long, and the single mode fiber transmitting terminal need not the power supply, can fall into multichannel simultaneous emission with light signal through optical divider, consequently the utility model discloses can provide the condition for the real-time on-line monitoring of the remote multiple spot amount of deflection of construction bridge.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of a single-mode fiber light source emitting device.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention to be solved clearer and more obvious, the following description of the present invention with reference to the accompanying drawings and embodiments is made to steps.
There are the following two schemes according to the installation positions of the fiber transmitting and receiving ends.
Example 1
As shown in fig. 1, embodiment 1 of the present invention includes a single-mode fiber light source emitting device, a light reflection component, and a light spot image receiving end;
the light reflection part adopts a plane reflector, the plane reflector is arranged at a measured point at the bottom of the bridge (usually the midspan position with the largest deflection of the bridge is selected), the single-mode optical fiber light source emitting device is fixed at the side of the ground below the plane reflector, the emitting angle of the single-mode optical fiber light source emitting device is adjusted, laser emitted by the single-mode optical fiber light source emitting device is emitted to the ground at the other side through the plane reflector, and then a light spot image receiving end is arranged at the position of a light beam.
As shown in fig. 3, the single-mode fiber light source emitting device includes a laser, a single-mode fiber and a collimating lens, which are sequentially disposed, an input end of the single-mode fiber is connected to an output end of the laser, an output end of the single-mode fiber corresponds to a center of the collimating lens, and a working wavelength of the single-mode fiber is matched with a wavelength of the laser, so that light waves are transmitted in a fundamental mode in the single-mode fiber.
In the utility model, according to the wavelength of the laser, the proper single-mode fiber is selected to transmit the fundamental mode of the light wave in the single-mode fiber under the working wavelength, so that the transverse field distribution is approximate to a Gaussian function when the light wave is emitted from the fiber end face; the size of the light beam on the receiving surface of the spot image can be minimized by adjusting the distance between the end surface of the single-mode optical fiber and the collimating lens.
The laser can adopt a semiconductor laser, a solid laser, a gas laser or a fiber laser.
Example 2
For an application scene that a light source transmitting end and a light source receiving end are not easy to install on the ground, the following technical scheme can be adopted:
as shown in fig. 2, embodiment 2 of the present invention includes a single-mode fiber light source emitting device, a light reflection component, and a light spot image receiving end;
the single-mode fiber light source emitting device is the same as that in the embodiment 1, the light reflection part adopts a right-angle reflector, the right-angle reflector is installed at a measured point at the bottom of a bridge (usually, the midspan position with the largest deflection of the bridge is selected), and the single-mode fiber light source emitting device and the light spot image receiving end are arranged on a bridge pier at the same side so as to return the original direction of an incident light beam.
Adopt the utility model discloses embodiment 1 and embodiment 2 measure the method of bridge amount of deflection as follows:
set for the light beam and the ground plane contained angle of single mode fiber light source emitter to light reflection part transmission to be α, paste the light reflection part at the bridge bottom and be h at vertical direction displacement, then after the reflection of light reflection part, the displacement of light beam central point on the plane perpendicular with the reverberation transmission direction is d, and the relational expression of d and h is:
the h value, i.e. the bridge deflection value, can be calculated by the above formula.
Claims (5)
- The system is characterized by comprising a single-mode optical fiber light source emitting device, a light reflection component and a light spot image receiving end, wherein the light reflection component is arranged at a measured point at the bottom of a bridge, the single-mode optical fiber light source emitting device and the light spot image receiving end are arranged at the ground or on a bridge pier below the bridge, and the single-mode optical fiber light source emitting device is used for emitting laser, reflecting the laser by the light reflection component and finally receiving the laser by the light spot image receiving end.
- 2. The bridge deflection measuring system according to claim , wherein the single-mode fiber light source emitting device comprises a laser, a single-mode fiber and a collimating lens, the laser, the single-mode fiber and the collimating lens are sequentially disposed, an input end of the single-mode fiber is connected to an output end of the laser, an output end of the single-mode fiber corresponds to a center of the collimating lens, and an operating wavelength of the single-mode fiber is matched with a wavelength of the laser, so that the light wave is transmitted in the single-mode fiber in a fundamental mode.
- 3. The bridge deflection measuring system using fiber optic light source as claimed in claim 2, wherein said laser is semiconductor laser, solid laser, gas laser or fiber laser.
- 4. The bridge deflection measuring system using fiber optic light source, wherein the light reflection member is a plane mirror, the single-mode fiber optic light source emitting device is located at side of the ground below the plane mirror, and the light spot image receiving end is located at side of the ground below the plane mirror.
- 5. The bridge deflection measuring system according to claim 1 and using fiber optic light source, wherein the light reflecting member is a right angle reflector, and the single mode fiber optic light source emitting device and the spot image receiving end are mounted on the same side of the bridge pier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920927363.8U CN210004967U (en) | 2019-06-19 | 2019-06-19 | bridge deflection measuring system adopting optical fiber light source |
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| CN201920927363.8U CN210004967U (en) | 2019-06-19 | 2019-06-19 | bridge deflection measuring system adopting optical fiber light source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132160A (en) * | 2019-06-19 | 2019-08-16 | 厦门大学 | A kind of Measurement Methods Of Bridge Deflection using optical fiber source |
| CN111156904A (en) * | 2019-12-30 | 2020-05-15 | 浙江大学 | Non-contact bridge displacement sensing method based on flexible photoelectric sensing array |
-
2019
- 2019-06-19 CN CN201920927363.8U patent/CN210004967U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132160A (en) * | 2019-06-19 | 2019-08-16 | 厦门大学 | A kind of Measurement Methods Of Bridge Deflection using optical fiber source |
| CN110132160B (en) * | 2019-06-19 | 2024-03-29 | 厦门大学 | Bridge deflection measuring method adopting optical fiber light source |
| 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 |
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