CN213579858U

CN213579858U - Fiber grating anchor cable force cell sensor made of all-toughened glass

Info

Publication number: CN213579858U
Application number: CN202022518821.8U
Authority: CN
Inventors: 胡仲春; 郭永兴; 张健; 马振珠
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-04
Filing date: 2020-11-04
Publication date: 2021-06-29
Anticipated expiration: 2030-11-04

Abstract

The utility model discloses a fiber grating anchor cable force cell sensor made of all toughened glass, which comprises a force cell elastomer, a cladding shell, a sealing ring, an optical fiber and a fiber grating; the force-measuring elastic body is of a large circular ring structure, and the anchor cable penetrates through the hollow part in the middle of the large circular ring of the force-measuring elastic body; the coating shell is a round coating shell and is fixed outside the force measuring elastic body; the sealing ring is of a ring body structure and is used for filling a gap below the coating shell; the optical fibers are arranged between the force measuring elastic body and the coating shell, comprise a plurality of optical fibers, are uniformly distributed along the circumferential direction and are arranged along the direction parallel to the central axis; and each optical fiber is fixed with an optical fiber grating which is positioned in the middle of the force-measuring elastic body in the axial direction. The utility model discloses a full toughened glass of all spare parts of sensor makes, has overcome present force cell sensor quality poor, corrosion resisting ability weak, the precision is low, the leakproofness is poor and metal material elastic modulus is big wait defect.

Description

Fiber grating anchor cable force cell sensor made of all-toughened glass

Technical Field

The utility model belongs to the technical field of photoelectron encapsulation and fiber grating sensing, concretely relates to fiber grating anchor rope force cell sensor of full toughened glass manufacturing.

Background

A bridge (bridge) refers to a building constructed for a road to cross a natural or artificial obstacle, and is erected on rivers, lakes and seas to enable vehicles, pedestrians and the like to smoothly pass through. The bridge generally consists of an upper structure, a lower structure and an auxiliary structure, wherein the upper structure mainly refers to a bridge span structure and a support system; the lower structure comprises a bridge abutment, a bridge pier and a foundation; the auxiliary structures refer to bridge end butt straps, tapered revetments, diversion works and the like. The bridge is divided according to a structural system and comprises four basic systems, namely a beam bridge, an arch bridge, a rigid bridge and a suspension cable bearing (a suspension bridge and a cable-stayed bridge).

Cable bearing bridges (cable-stayed and suspension bridges) are the best design for constructing bridges with very large spans. The road or railway deck is suspended in the air by steel cables, and the cables are suspended between the pylons. The main span of the cable-stayed bridge can reach 890m, and the suspension bridge can reach 1991 m.

In the use process of the bridge body, factors such as the manufacturing mode of the bridge body component, the external structure, the vehicle load, the use environment, sudden natural disasters and the like cause damage and aging of the bridge body in different degrees, inevitably cause damage accumulation and material resistance attenuation of the bridge body component, lead the whole structure to be lower than the designed service life to cause the early damage of the bridge body, even cause the occurrence of sudden events and bring serious economic loss. Therefore, in order to ensure the normal stress of the core of the structure and the use of the whole structure, a sensing technology capable of monitoring indexes such as stress, strain and the like of the structure (member) in real time is developed, and the method is particularly important in the current bridge safety guarantee. The guy cable of large-span cable-stayed bridge, suspension bridge and arch bridge is the key atress component of bridge system, often leads to the life of guy cable to shorten even fracture because local fatigue is caused such as corruption, wind vibration and vehicle pass, and serious meeting leads to the bridge to collapse. Therefore, the change condition of the anchor cable is monitored for a long time, and the method has important significance for guaranteeing the operation safety of the bridge.

The main problems in the prior art include:

the prior anchor cable force transducer technology has the following problems: (1) the sensor is mostly made of metal alloy materials, and when the force of the cable to be measured is small, the deformation quantity of the metal diaphragm is small due to the large elastic modulus of the metal materials, so that the force measuring accuracy of the sensor is low. (2) In the assembly process of the sensor, gaps are difficult to avoid, the sealing performance is poor, and sensitive elements such as internal fiber gratings are easily polluted by external substances and damaged. (3) The metal matrix material used by the sensor has poor corrosion resistance, and is easy to corrode in the long-term outdoor anchor cable force monitoring process, so that the performance is influenced.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned problem that exists among the prior art, the utility model provides a fiber grating anchor rope force cell sensor that full toughened glass made has realized the full toughened glass of all spare parts of sensor and has made, has overcome present force cell sensor quality poor, corrosion resisting capability weak, the precision is low, the leakproofness is poor and metal material elastic modulus is big wait defect.

Therefore, the utility model adopts the following technical scheme:

a fiber grating anchor cable force cell sensor made of all toughened glass comprises a force cell elastomer, a coating shell, a sealing ring, an optical fiber and a fiber grating; the force-measuring elastic body is of a large circular ring structure, and the anchor cable penetrates through the hollow part in the middle of the large circular ring of the force-measuring elastic body; the coating shell is a round coating shell and is fixed outside the force measuring elastic body; the sealing ring is of a ring body structure and is used for filling a gap below the coating shell; the optical fibers are arranged between the force measuring elastic body and the coating shell, comprise a plurality of optical fibers, are uniformly distributed along the circumferential direction and are arranged along the direction parallel to the central axis; and each optical fiber is fixed with an optical fiber grating which is positioned in the middle of the force-measuring elastic body in the axial direction.

Preferably, two circular ring bulges, namely an upper circular ring bulge and a lower circular ring bulge, are symmetrically distributed on the periphery of the large circular ring body of the force measuring elastic body from top to bottom; an inner bulge is arranged inside the coating shell and is in contact with the upper end of the upper circular ring bulge; the two ends of the optical fiber are respectively fixed on the upper circular ring bulge and the lower circular ring bulge, and the fiber bragg grating is positioned on the optical fiber between the upper circular ring bulge and the lower circular ring bulge.

Preferably, the upper part of the cladding shell is provided with a plurality of second fiber outlet holes, and the number of the second fiber outlet holes is equal to the number of the optical fibers and is used for leading out the optical fibers; the sealing ring is provided with a plurality of first fiber outlet holes, and the number of the first fiber outlet holes is equal to that of the optical fibers and used for leading out the optical fibers.

Preferably, the first fiber outlet hole and the second fiber outlet hole are concentric.

Preferably, the number of the optical fibers is 4, and the optical fibers are uniformly distributed at intervals of 90 degrees along the circumferential direction.

Preferably, the fiber grating is written in the core of the optical fiber by using a phase mask method.

Preferably, the force measuring elastic body, the cladding shell and the sealing ring are all made of toughened glass, and the optical fiber is a glass optical fiber made of silicon dioxide.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the fiber grating element is packaged by glass which is made of the same material as the fiber grating element, is packaged into a full glass body, is corrosion-resistant and has no aging, and the defects of parameter change and service life shortening of the fiber grating sensor caused by aging of manufacturing materials and packaging materials are overcome.

(2) Compared with an anchor cable force transducer prepared from a traditional metal material, the glass material is stronger in corrosion resistance, longer in service life and better in using effect in some severe monitoring environments.

(3) Compared with the anchor cable force cell sensor prepared by the traditional metal material, the glass material can have lower elastic modulus under the condition of the same strength, so that the deformation of the glass material is larger than that of the metal material when the glass material is subjected to pressure, and the glass material has higher precision when the pressure to be measured is lower.

Drawings

Fig. 1 is a schematic view of a cross-sectional structure of a fiber grating anchor cable force sensor made of all tempered glass according to the present invention.

Fig. 2 is a schematic view of a three-dimensional structure of a fiber grating anchor cable force cell sensor made of all tempered glass according to the present invention.

FIG. 3 is a schematic cross-sectional view of a force-measuring elastomer.

Fig. 4 is a schematic cross-sectional view of the cladding case.

Fig. 5 is a schematic sectional view of the seal ring.

Description of reference numerals: 1. a force measuring elastic body; 2. coating the shell; 3. a seal ring; 4. an optical fiber; 5. a fiber grating; 1-1, arranging a circular bulge; 1-2, the lower ring is convex; 2-1, inward bulge; 2-2, a second fiber outlet hole; 3-1, a first fiber outlet hole.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are only used for explaining the present invention, but not for limiting the present invention.

A fiber grating anchor cable force cell sensor made of fully tempered glass, comprising:

the force-measuring elastic body 1 is an elastic element made of toughened glass and structurally comprises a large circular ring body, and an anchor cable penetrates through the hollow part in the middle of the large circular ring body of the force-measuring elastic body 1. Two circular ring bulges are symmetrically distributed on the periphery of the large circular ring body from top to bottom, and comprise an upper circular ring bulge 1-1 and a lower circular ring bulge 1-2. The reason for this design is that let pressure effect on the big ring of dynamometry elastomer 1, bear pressure with big ring, and upper ring arch 1-1 and lower ring arch 1-2 that the upper and lower symmetry distributes are used for the fixed circumference interval 4 groups of optic fibre that 90 degrees distributed.

The coating shell 2 is made of toughened glass and is a round coating shell in appearance. It has an inner protrusion 2-1 inside. When the force measuring elastic body 1 is installed, the inner bulge 2-1 is contacted with the upper end of the circular bulge 1-1 on the outer part of the force measuring elastic body 1, so that the coating shell 2 is accurately fixed on the force measuring elastic body 1. After the fixation, the lower opening is used for installing the sealing ring 3. Thereby hermetically preserving the entire measuring device. 4 second fiber outlet holes 2-2 are symmetrically distributed on the upper part of the cladding shell 2 at intervals of 90 degrees and are respectively used for leading out 4 groups of optical fibers arranged on the force measuring elastic body 1. The second fiber outlet 2-2 is used for leading out the optical fiber 4 so as to facilitate the transmission and analysis of the optical signal.

The sealing ring 3 is a ring body made of toughened glass. For filling the void under the covering shell 2 and thus protecting and sealing the measuring elastomer 1. 4 first fiber outlet holes 3-1 are distributed around the sealing ring 3 at intervals of 90 degrees and are respectively used for leading out 4 groups of optical fibers arranged on the force measuring elastic body 1. The first fiber outlet hole 3-1 is used for leading out the optical fiber 4 so as to facilitate the transmission and analysis of the optical signal.

The optical fiber 4 is a silica glass optical fiber. Two sides of the optical fiber 4 are fixed on an upper circular ring bulge 1-1 and a lower circular ring bulge 1-2 which are distributed on the periphery of the force measuring elastic body 1, and then two ends of the optical fiber 4 are led out from a second fiber outlet hole 2-2 on the coating shell 2 and a first fiber outlet hole 3-1 on the sealing ring 3, so that transmission and analysis of optical signals are facilitated. Otherwise, the other three sets of optical fibers are mounted in the same manner as described above.

And the fiber grating 5 is inscribed in the fiber core of the optical fiber 4 by adopting a phase mask method and is positioned on the optical fiber 4 between the upper circular ring bulge 1-1 and the lower circular ring bulge 1-2.

The working principle is as follows: after all the components are installed, the fiber grating anchor cable force measuring sensor is installed at the anchor head of the inhaul cable, and when the inhaul cable is stressed, pressure is applied to the force measuring elastic body 1, so that the force measuring elastic body 1 generates strain. According to hooke's law, elastomer strain is linear with the pressure to which it is subjected. The deformation of the force-measuring elastic body 1 is transmitted to the fiber grating 5 on the optical fiber 4 through the upper circular ring bulge 1-1 and the lower circular ring bulge 1-2, so that the fiber grating 5 is deformed. The fiber grating 5 is affected by strain and its center wavelength shifts. The wavelength signal of the fiber grating 5 is input into the fiber grating demodulator for analysis through the second fiber outlet hole 2-2 via the optical fiber 4, so as to obtain the change condition of the wavelength.

Examples

As shown in fig. 1 and 2, the utility model provides a fiber grating anchor cable force cell sensor that full toughened glass encapsulation was made, include: the force measuring device comprises a force measuring elastic body 1, a coating shell 2, a sealing ring 3, an optical fiber 4 and an optical fiber grating 5.

The force-measuring elastic body 1 is made of tempered glass as shown in fig. 3, and the glass in a molten state is poured into a mold under a high temperature condition, solidified and cooled, and then cast into the force-measuring elastic body 1. As shown in figure 1, the outer wall of the force-measuring elastic body 1 and the upper end of the upper circular ring bulge 1-1 are contacted with an inner bulge 2-1 of the cladding shell 2 when being installed, and the contacted parts are welded together in a high-voltage discharge mode. Removing coating layers from two ends of the optical fiber 4, pre-stretching, respectively fixing the optical fiber 4 on two sides of the optical fiber grating 5 on an upper circular ring bulge 1-1 and a lower circular ring bulge 1-2 distributed on the periphery of the force-measuring elastic body 1 through high-voltage discharge, and totally installing 4 groups, wherein each group of optical fibers 4 are distributed at intervals of 90 degrees along the circumferential direction of the force-measuring elastic body 1.

The coating shell 2 is made of toughened glass, the glass in a molten state is poured into a mould under a high temperature condition, and the coating shell 2 is cast after solidification and cooling. Four second fiber outlet holes 2-2 are distributed around the cladding shell 2, and the second fiber outlet holes 2-2 are marked in figure 4. An inner protrusion 2-1 is formed inside the sheathing case 2. When the force measuring elastic body 1 is installed, the inner bulge 2-1 is contacted with the upper end of the circular bulge 1-1 on the outer part of the force measuring elastic body 1, so that the coating shell 2 is accurately fixed on the force measuring elastic body 1. After the fixation, the parts contacted with each other are welded together by high-voltage discharge. 4 groups of optical fibers mounted on the upper circular ring bulge 1-1 and the lower circular ring bulge 1-2 are led out from 4 second fiber outlet holes 2-2 on the cladding shell 2 respectively, and a schematic diagram of two groups is given in fig. 1: the optical fiber 4 is led out from the second fiber outlet hole 2-2.

The sealing ring 3 is made of toughened glass, the glass in a molten state is poured into a mould under a high temperature condition, and the sealing ring 3 is cast after solidification and cooling. 4 first fiber outlet holes 3-1 are symmetrically distributed on the sealing ring 3 at intervals of 90 degrees, and the 4 first fiber outlet holes 3-1 are respectively concentric with 4 second fiber outlet holes 2-2 on the cladding shell 2. In the installation process, 4 groups of optical fibers 4 are led out from 4 first fiber outlet holes 3-1 on a sealing ring 3, then the outer wall and the inner wall of the sealing ring 3 are respectively contacted with a coating shell 2 and a force measuring elastic body 1 according to the figure 1, and the contacted positions are welded together in a high-voltage discharge mode.

The optical fiber 4 is a silica glass optical fiber.

And the fiber grating 5 is inscribed in the fiber core of the optical fiber 4 by adopting a phase mask method.

As shown in FIG. 3, the sectional structure of the force-measuring elastic body 1 includes an upper circular protrusion 1-1 and a lower circular protrusion 1-2.

As shown in fig. 4, the cross-sectional structure of the covering shell 2 includes an inner protrusion 2-1 and a second fiber outlet 2-2.

As shown in FIG. 5, the cross-sectional structure of the seal ring 3 includes a first fiber outlet hole 3-1.

The fiber bragg grating anchor cable force measuring sensor is installed at the anchor head of the inhaul cable, and when the inhaul cable is stressed, pressure is applied to the force measuring elastic body 1, so that the force measuring elastic body 1 generates strain. According to hooke's law, elastomer strain is linear with the pressure to which it is subjected. The deformation of the force-measuring elastic body 1 is transmitted to the optical fiber 4 and the fiber grating 5 through the upper circular ring bulge 1-1 and the lower circular ring bulge 1-2, so that the fiber grating 5 is deformed. The fiber grating 5 is affected by strain and its center wavelength shifts. Wavelength signals of the fiber bragg grating 5 are input into the fiber bragg grating demodulator from the second fiber outlet hole 2-2 through the optical fiber 4 for analysis, and the relational expression of pressure and wavelength can be determined through a pressure calibration experiment.

The above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalent replacements, and improvements made within the spirit and principle scope of the present invention should be included within the protection scope of the present invention.

Claims

1. The utility model provides a fiber grating anchor rope force cell sensor that full toughened glass made which characterized in that: comprises a force measuring elastic body (1), a coating shell (2), a sealing ring (3), an optical fiber (4) and an optical fiber grating (5); the force-measuring elastic body (1) is of a large circular ring structure, and the anchor cable penetrates through the hollow part in the middle of the large circular ring of the force-measuring elastic body (1); the coating shell (2) is a round coating shell and is fixed outside the force measuring elastic body (1); the sealing ring (3) is of a ring body structure and is used for filling the gap below the coating shell (2); the optical fibers (4) are arranged between the force measuring elastic body (1) and the coating shell (2), comprise a plurality of optical fibers, are uniformly distributed along the circumferential direction and are arranged along the direction parallel to the central axis; each optical fiber (4) is fixed with an optical fiber grating (5), and the optical fiber grating (5) is positioned in the middle of the force measuring elastic body (1) in the axial direction.

2. The fiber grating anchor cable load cell of claim 1, wherein the fiber grating anchor cable load cell comprises: two circular ring bulges, namely an upper circular ring bulge (1-1) and a lower circular ring bulge (1-2), are symmetrically distributed on the periphery of the large circular ring body of the force measuring elastic body (1) from top to bottom; an inner bulge (2-1) is arranged inside the coating shell (2), and the inner bulge (2-1) is contacted with the upper end of the upper circular bulge (1-1); the two ends of the optical fiber (4) are respectively fixed on the upper circular ring bulge (1-1) and the lower circular ring bulge (1-2), and the optical fiber grating (5) is positioned on the optical fiber (4) between the upper circular ring bulge (1-1) and the lower circular ring bulge (1-2).

3. The fiber grating anchor cable load cell of claim 1, wherein the fiber grating anchor cable load cell comprises: the upper part of the cladding shell (2) is provided with a plurality of second fiber outlet holes (2-2), the number of the second fiber outlet holes (2-2) is equal to that of the optical fibers (4), and the second fiber outlet holes are used for leading out the optical fibers (4); the sealing ring (3) is provided with a plurality of first fiber outlet holes (3-1), and the number of the first fiber outlet holes (3-1) is equal to that of the optical fibers (4) and used for leading out the optical fibers (4).

4. The fiber grating anchor cable load cell of claim 3, wherein the fiber grating anchor cable load cell comprises: the first fiber outlet hole (3-1) and the second fiber outlet hole (2-2) are concentric.

5. The fiber grating anchor cable load cell of claim 1, wherein the fiber grating anchor cable load cell comprises: the number of the optical fibers (4) is 4, and the optical fibers are uniformly distributed at intervals of 90 degrees along the circumferential direction.

6. The fiber grating anchor cable load cell of claim 1, wherein the fiber grating anchor cable load cell comprises: the fiber grating (5) is inscribed in the core of the optical fiber (4) by adopting a phase mask method.

7. The fiber grating anchor cable load cell of any one of claims 1-6, wherein: the force-measuring elastic body (1), the cladding shell (2) and the sealing ring (3) are all made of toughened glass, and the optical fiber (4) is made of silicon dioxide glass optical fiber.