Optical fiber sensing device for bridge pier vibration monitoring
Through the optical fiber sensing technology, real -time monitoring of the small vibration of the bridge pier solves the problem of inaccurate monitoring in the existing technologies, heavy equipment, and long -distance transmission signal attenuation, and realizes high accuracy, stability and anti -interference. Essence
Patent Information
- Application Number
- CN202420767029.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-15
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-04-15
AI Technical Summary
The existing bridge pier vibration monitoring methods are difficult to meet the needs of long-term and real-time monitoring, and the traditional monitoring methods have problems such as bulky equipment, complex wiring, poor stability and long-distance transmission signal attenuation.
The optical fiber sensing technology is used to wrap it on the bridge pier through sensor optical fiber spirals, combined with narrow bandwidth laser sources, optical fiber demoders, and monitoring hosts to capture the tiny vibration of the bridge pier in real time, and transmit it through the light signal.
The accurate and real -time monitoring of the pier vibration is realized, the errors in the traditional monitoring methods are reduced, the monitoring process is simplified, the stability and anti -interference ability are improved, and the problem of the attenuation of the long -distance transmission signal is solved.
Smart Images
Figure CN222419257U_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of optical fiber sensing, and more specifically, to an optical fiber sensing device for monitoring bridge pier vibration. Background Art
[0002] Bridges are buildings that span large obstacles, rivers, and gullies, and are an important part of transportation. For bridge piers, which are important components of bridges, damage caused by vibration during the service life of the bridge is one of the important factors affecting bridge safety. At present, bridge pier vibration monitoring usually uses sensors for measurement, which is difficult to meet the needs of long-term and real-time monitoring. Sensing optical fibers are widely used in the field of bridge monitoring because of their easy installation, high sensitivity, good stability, and ability to achieve long-distance transmission. Utility Model Content
[0003] The main purpose of the utility model is to solve the shortcomings of the existing bridge pier vibration monitoring method and provide an optical fiber sensing device for bridge pier vibration monitoring, which is characterized by being able to monitor the vibration of the bridge pier in real time.
[0004] The utility model provides an optical fiber sensing device for monitoring bridge pier vibration, the optical fiber sensing device comprising an optical fiber component, a measuring component and a hanging basket;
[0005] The optical fiber assembly is a sensing optical fiber, and the sensing optical fiber is uniformly spirally wound on the bridge pier;
[0006] The measuring component comprises a narrow bandwidth laser source, an optical fiber demodulator and a monitoring host. The narrow bandwidth laser source and the optical fiber demodulator are respectively arranged at two ends of the sensing optical fiber and are both electrically connected to the sensing optical fiber.
[0007] The hanging basket includes a first side panel, a second side panel, a third side panel, a drainage hole, a wire trough, screws, a metal rod, and a bottom plate. The first side panel, the second side panel, and the third side panel are arranged around the bottom plate and connected to the bottom plate by welding. The metal rod is welded to the side of the bottom plate.
[0008] Furthermore, the manufacturing process of the optical fiber assembly is: wrapping a 5mm thick polyethylene protective layer outside the bare optical fiber.
[0009] Furthermore, the protective layer of the optical fiber assembly also includes a plurality of spaced apart fixing members, the fixing members including screws and ferrules for fixing the protective layer, one end of the screw is fixed to the ferrule, and the other end is fixed to the pier.
[0010] Furthermore, the ferrule is made of metal material.
[0011] Furthermore, the ferrules are evenly spaced and arranged outside the sensing optical fiber.
[0012] Furthermore, a hanging basket is installed on the top of the pier, and the hanging basket is fixed to the pier by screws, and the hanging basket is placed coaxially and parallel to the pier.
[0013] Furthermore, the first side panel and the third side panel are respectively provided with wire grooves for routing the sensing optical fiber.
[0014] Furthermore, when the sensing optical fiber is installed, it is connected to the optical fiber demodulator through a wire groove on the side of the hanging basket.
[0015] Furthermore, the bottom of the hanging basket is evenly covered with drainage holes for drainage.
[0016] Furthermore, the drainage hole is configured to be in a constricted shape.
[0017] Furthermore, the monitoring host is electrically connected to the optical fiber demodulator through a wire groove on the side of the hanging basket.
[0018] The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:
[0019] The utility model applies optical fiber sensing technology to the vibration monitoring of bridge piers. Compared with traditional monitoring methods, this new technology can more accurately capture the tiny vibrations of bridge piers, thereby effectively reducing the errors that may be generated in traditional monitoring methods. The use of optical fiber sensing technology not only improves the accuracy of monitoring, but also overcomes many shortcomings of traditional monitoring methods.
[0020] Traditional monitoring methods often bring many inconveniences due to bulky equipment and complicated wiring. However, the new fiber optic sensing technology greatly simplifies the monitoring process and reduces the difficulty of operation through lightweight fiber optic sensors and flexible wiring methods. In addition, traditional monitoring methods often have the problem of poor stability and are easily affected by environmental interference.
[0021] The high anti-interference ability and strong stability effectively avoid this problem.
[0022] More importantly, fiber optic sensing technology solves the problem of long-distance transmission of traditional monitoring methods. Traditional monitoring signal transmission methods often cause signal attenuation or distortion due to long distances, while fiber optic sensing technology uses optical signals for transmission, which has the advantages of low loss and long transmission distance, so that monitoring data can be accurately and real-time transmitted to the monitoring center, providing a strong guarantee for the safety monitoring of bridges.
[0023] In summary, the fiber optic sensing technology adopted in the utility model has brought changes to the vibration monitoring of bridge piers, which not only improves the accuracy and stability of monitoring, but also simplifies the monitoring process, solves the problem of long-distance transmission, and provides more reliable technical support for the safe monitoring and maintenance of bridges. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a structural schematic diagram of a fiber optic sensor device for monitoring bridge pier vibration in use state provided in an embodiment of the present application.
[0025] Figure 2 It is a schematic diagram of the hanging basket provided in the embodiment of the present application.
[0026] Figure 3 It is a structural diagram of the sensing optical fiber and the protective layer provided in the embodiment of the present application.
[0027] Figure 4 It is a structural diagram of a ferrule provided in an embodiment of the present application.
[0028] Explanation of the reference numerals: 1. Sensing optical fiber; 2. Hanging basket; 3. Optical fiber demodulator; 4. Ferrule; 5. Bridge pier; 6. Narrow bandwidth laser source; 7. Monitoring host; 8. Drain hole; 9. Wire trough; 10. Protective layer; 11. Screw; 12. Bare optical fiber; 13. First side panel; 14. Second side panel; 15. Third side panel; 16. Metal rod; 17. Bottom panel. DETAILED DESCRIPTION
[0029] The following is combined with Figure 1-4 Further explanation of the present application. The following will be combined with the drawings in the embodiments of the present utility model to clearly and completely describe the technical solutions in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.
[0030] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The following is an explanation of the embodiments of the present utility model based on the overall structure of the present utility model.
[0031] Example:
[0032] Reference Figure 1 The core component of the embodiment of this application is the sensing optical fiber 1, which can capture every tiny vibration of the bridge pier 5. It is spirally wound on the outside of the bridge pier 5 to ensure that every dynamic of the bridge pier 5 can be accurately captured. In addition, there are key equipment such as narrow bandwidth laser source 6, optical fiber demodulator 3 and monitoring host 7. The hanging basket 2 is used to hold them. It is hung on the top of the bridge pier and is coaxial with the bridge pier to ensure the stable monitoring work.
[0033] The monitoring process is simple and efficient. First, we connect one end of the sensing fiber 1 to the narrow bandwidth laser source 6, and the other end to the fiber demodulator 3 through the cable trough 9. Then, the narrow bandwidth laser source 6 injects optical signals into the sensing fiber 1. When these optical signals propagate in the sensing fiber 1, they are affected by the vibration of the pier 5 and interfere. The fiber demodulator 3 captures these interference signals and measures the vibration frequency of the pier 5 in real time through interferometric optical time domain reflection technology and Fourier transform. This data is then transmitted to the monitoring host 7 for detailed analysis and processing.
[0034] Reference Figure 2The hanging basket 2 includes a first side panel 13, a second side panel 14, a third side panel 15, a drainage hole 8, a wire groove 9, a screw 11, a metal rod 16, and a bottom plate 17. The first side panel 13, the second side panel 14, and the third side panel 15 are arranged on the bottom plate 17 and welded to the bottom plate 17. The metal rod 16 is connected to the side of the bottom plate 17 by welding. At the same time, in order to meet the wiring requirements of the sensing optical fiber 1, wire grooves for the wiring of the sensing optical fiber 1 are respectively provided on the first side panel 13 and the third side panel 15. Furthermore, in order to avoid water accumulation in the hanging basket 2 and damage to the optical fiber demodulator 3, drainage holes 8 for drainage are evenly arranged on the bottom plate 17 in a shrinking shape.
[0035] Reference Figure 3 , showing the detailed structure of the sensing optical fiber 1, which is made of a 5 mm thick polyethylene material wrapped around a bare optical fiber 12. Such a design not only enhances the durability of the optical fiber, but also protects it from interference from the external environment, ensuring the accuracy of the monitoring data.
[0036] at last, Figure 4 The structure diagram of the ferrule 4 is shown. The ferrule 4 is made of metal material, and its main function is to fix and protect the sensing optical fiber 1, ensuring that its winding on the bridge pier 5 is more stable and reliable.
[0037] The technical principle of this embodiment is that when the bridge vibrates vertically or horizontally, the optical fiber will be disturbed, which will cause its refractive index to change. This change in refractive index further affects the phase of the light wave at the disturbed part, causing it to change. Subsequently, the change in the phase of the light wave will act on the intensity of the Rayleigh scattered light, causing its intensity to change accordingly. Through precise analysis of the law of change in the intensity of the Rayleigh scattered light, we can convert this information into time domain information and perform in-depth processing through the monitoring host. Finally, the monitoring host will automatically output the vibration frequency to achieve effective monitoring of the bridge vibration.
Claims
1. An optical fiber sensing device for monitoring bridge pier vibration, characterized in that: The optical fiber sensing device comprises an optical fiber component, a measuring component and a hanging basket (2); The optical fiber assembly is a sensing optical fiber (1), and the sensing optical fiber (1) is uniformly spirally wound on the bridge pier (5); The measuring component comprises a narrow bandwidth laser source (6), an optical fiber demodulator (3), and a monitoring host (7); the narrow bandwidth laser source (6) and the optical fiber demodulator (3) are respectively arranged at two ends of the sensing optical fiber (1), and are both electrically connected to the sensing optical fiber (1); The hanging basket (2) comprises a first side plate (13), a second side plate (14), a third side plate (15), a drainage hole (8), a wire groove (9), a screw (11), a metal rod (16), and a bottom plate (17); the first side plate (13), the second side plate (14), and the third side plate (15) are arranged around the bottom plate (17) and connected to the bottom plate (17) by welding; and the metal rod (16) is welded to the side of the bottom plate (17).
2. The optical fiber sensing device for monitoring bridge pier vibration according to claim 1, characterized in that: The monitoring host (7) can monitor the vertical and lateral vibrations of the bridge pier (5).
3. The optical fiber sensing device for monitoring bridge pier vibration according to claim 1, characterized in that: The sensing optical fiber (1) is made of a bare optical fiber (12) wrapped with a polyethylene material with a thickness of 5 mm.
4. The optical fiber sensing device for monitoring bridge pier vibration according to claim 1, characterized in that: The sensing optical fiber (1) also includes a plurality of fixing parts arranged at intervals.
5. The optical fiber sensing device for monitoring bridge pier vibration according to claim 4, characterized in that: The fixing member comprises a screw (11) and a ferrule (4) for fixing the sensing optical fiber (1); one end of the screw (11) is fixed to the ferrule (4), and the other end is fixed to the bridge pier (5).
6. The optical fiber sensing device for monitoring bridge pier vibration according to claim 5, characterized in that: The ferrule (4) is made of metal material.
7. The optical fiber sensing device for monitoring bridge pier vibration according to claim 5, characterized in that: The ferrules (4) are arranged at even intervals outside the sensing optical fiber (1).
8. The optical fiber sensing device for monitoring bridge pier vibration according to claim 1, characterized in that: A hanging basket (2) is fixed on the top of the bridge pier (5), and the hanging basket (2) is placed coaxially and parallel to the bridge pier (5).
9. The optical fiber sensing device for monitoring bridge pier vibration according to claim 1, characterized in that: The hanging basket (2) and the bridge pier (5) are connected by screws (11).
10. The optical fiber sensing device for monitoring bridge pier vibration according to claim 1, characterized in that: Drain holes (8) for drainage are evenly distributed on the bottom of the hanging basket (2).
11. The optical fiber sensing device for monitoring bridge pier vibration according to claim 1, characterized in that: The drainage hole (8) is configured to be in a constricted shape.
12. The optical fiber sensing device for monitoring bridge pier vibration according to claim 1, characterized in that: The first side plate (13) and the third side plate (15) are respectively provided with wire grooves (9) for routing the sensing optical fiber (1).
13. The optical fiber sensing device for monitoring bridge pier vibration according to claim 9, characterized in that: When the sensing optical fiber (1) is installed, it is connected to the optical fiber demodulator (3) through the wire groove (9) on the side of the hanging basket (2).