CN106679574B - Rock mass displacement testing device and system based on fiber bragg grating - Google Patents
Rock mass displacement testing device and system based on fiber bragg grating Download PDFInfo
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- CN106679574B CN106679574B CN201710152229.0A CN201710152229A CN106679574B CN 106679574 B CN106679574 B CN 106679574B CN 201710152229 A CN201710152229 A CN 201710152229A CN 106679574 B CN106679574 B CN 106679574B
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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
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
Abstract
The invention relates to the technical field of testing, in particular to a rock mass displacement testing device and system based on fiber bragg gratings. The rock mass displacement testing system based on the fiber bragg grating comprises a rock mass displacement testing device based on the fiber bragg grating, and the rock mass displacement testing device based on the fiber bragg grating comprises a conical body, an elastic sheet, an ejector pin, a protection cavity, a connecting block, a first spring, a dowel bar, a protection pipe and an anchor head. When the dowel bar is stressed, the connecting block and the conical body move along the stress direction of the dowel bar, the elastic sheet moves up and down relative to the conical body when the ejector pin moves, the grating pitch changes when the elastic sheet moves up and down, the change of the grating pitch changes the reflection wavelength of light, and the change of the rock mass displacement is obtained.
Description
Technical Field
The invention relates to the technical field of testing, in particular to a rock mass displacement testing device and system based on fiber bragg gratings.
Background
The geological environment of rock engineering is complex, landslide and rockburst disasters in the large-scale engineering construction process are the most critical factors influencing the engineering construction safety and operation, and construction equipment damage and major casualty accidents are caused by engineering accidents. The occurrence of the disasters usually reflects the displacement change in the rock mass firstly, and the early warning and control of the disasters can be effectively realized through directly acquiring or evolving displacement information on site, so that the displacement monitoring in the rock mass becomes one of the most important contents for the research of the rock engineering disasters.
Disclosure of Invention
In view of the above, the present invention provides a rock mass displacement testing device based on fiber bragg gratings, which includes a conical body, an elastic sheet, an ejector pin, a protection cavity, a connection block, a first spring, a dowel bar, a protection tube, and an anchor head, wherein a grating is disposed on the elastic sheet, and changes in reflection wavelength of detection light passing through the grating are detected to obtain changes in the position of a rock mass.
The invention also aims to provide a rock mass displacement testing system based on the fiber bragg grating, which is characterized in that a plurality of rock mass displacement testing devices based on the fiber bragg grating, which comprise a conical body, an elastic sheet, an ejector pin, a protection cavity, a connecting block, a first spring, a dowel bar, a protection pipe and an anchor head, are arranged, and a fiber bragg grating wavelength demodulator is used for monitoring the size of the reflection wavelength in the fiber optic line in real time to obtain the change of the position of the rock mass.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
a rock mass displacement testing device based on fiber bragg gratings comprises a force measuring portion and a force transmitting portion, wherein the force measuring portion is connected with the force transmitting portion.
The force measuring part comprises a conical body, an elastic sheet, an ejector pin and a protection cavity, and the force transmission part comprises a connecting block, a first spring, a force transmission rod, a protection pipe and an anchor head.
The conical body passes through the connecting block with the dowel steel is connected, the protection cavity has spacing portion, first spring housing is located dowel steel and card are located the connecting block with between the spacing portion, dowel steel one end is passed protection cavity, the other end with the anchor head is connected, protection tube housing is located dowel steel and one end with the protection cavity is connected the other end with the anchor head is connected, the protection cavity is close to conical body department is provided with the opening, the shell fragment set up in the opening part, the thimble set up in the shell fragment with between the conical body, the upper surface and/or the lower surface of shell fragment are provided with the grating.
The anchor head is stressed and transmitted to the dowel bar, the connecting block and the conical body move along the stress direction of the dowel bar, the grating pitch of the elastic sheet changes when the thimble moves up and down relative to the conical body, and the reflection wavelength of light in the optical fiber line changes accordingly.
Optionally, in above-mentioned rock mass displacement testing arrangement based on fiber grating, spacing portion includes first spacing portion and the spacing portion of second, first spacing portion and the spacing portion of second set up respectively in the protection cavity is located the both sides of connecting block, first spacing portion is close to the dowel steel, first spring set up in first spacing portion with between the connecting block, the portion of biography power still includes the second spring, the second spring set up in the spacing portion of second with between the connecting block, the conical body with the second spring is close to the one end of the spacing portion of second is connected.
Optionally, in the above rock mass displacement testing apparatus based on fiber grating, the force transmission portion further includes a connecting rod, the connecting rod is connected between the connecting block and the conical body, and the second spring is sleeved on the connecting rod and is arranged between the second limiting portion and the connecting block.
Optionally, in the device for testing rock mass displacement based on fiber bragg grating, the cone includes a thick end and a thin end, the thin end of the cone is connected with the connecting block, and the thick end of the cone extends out of the protection cavity.
Optionally, in the device for testing rock mass displacement based on fiber grating, the grating is a fiber grating sheet, the elastic sheet is a metal elastic sheet, and the fiber grating sheet is attached to the upper surface and the lower surface of the metal elastic sheet.
Optionally, in the device for testing rock mass displacement based on fiber bragg grating, a protection cylinder is disposed at one end of the protection cavity close to the opening, the protection cavity is sleeved with the protection cylinder, and the protection cavity and the protection cylinder are hollow cylinders.
Optionally, in the device for testing rock mass displacement based on fiber bragg grating, the radius of the protection cavity is greater than the sum of the radius of the protection cylinder and the length of the thimble.
Optionally, in the device for testing rock mass displacement based on fiber bragg grating, the anchor head is in threaded connection with the dowel bar.
Optionally, in the device for testing rock mass displacement based on fiber bragg grating, the cone, the thimble, the protection cavity and the dowel bar are made of metal materials, and the protection tube is made of PVC materials.
The invention also provides a rock mass displacement testing system based on the fiber grating, which comprises a fiber grating wavelength demodulator and a plurality of rock mass displacement testing devices based on the fiber grating, wherein the fiber grating wavelength demodulator is respectively connected with each rock mass displacement testing device based on the fiber grating.
The invention provides a rock mass displacement testing device and system based on fiber bragg gratings, wherein the rock mass displacement testing system based on the fiber bragg gratings comprises the rock mass displacement testing device based on the fiber bragg gratings, the rock mass displacement testing device based on the fiber bragg gratings is provided with a conical body, an elastic sheet, an ejector pin, a protection cavity, a connecting block, a first spring, a force transmission rod, a protection pipe and an anchor head, the elastic sheet is provided with the gratings, and the change of the rock mass position is obtained by detecting the change of the reflection wavelength after light passes through the gratings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention, and for those skilled in the art, other related drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a rock mass displacement testing device based on fiber bragg gratings according to an embodiment of the present invention.
Fig. 2 is another schematic structural diagram of a rock mass displacement testing device based on fiber bragg gratings according to an embodiment of the present invention.
Fig. 3 is a structural block diagram of a rock mass displacement testing system based on fiber bragg gratings according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a rock mass displacement testing system based on fiber bragg gratings according to an embodiment of the present invention.
Icon: 10-a rock mass displacement testing device based on fiber bragg gratings; 30-fiber grating wavelength demodulator; 50-a terminal device; 70-a protective cover; 100-a force measuring part; 110-cone; 120-spring plate; 140-a thimble; 150-a protective cavity; 152-a first limit portion; 154-a second stop; 156-an opening; 160-a protective cylinder; 200-a force transfer portion; 210-connecting block; 220-a first spring; 230-dowel bar; 240-a second spring; 250-a connecting rod; 260-protective tube; 270-anchor head.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
As shown in fig. 1, the invention provides a rock mass displacement testing device 10 based on fiber bragg grating, which comprises a force measuring part 100 and a force transmitting part 200, wherein the force measuring part 100 is connected with the force transmitting part 200.
The force measuring part 100 comprises a conical body 110, an elastic sheet 120, a thimble 140 and a protection cavity 150, and the force transmission part 200 comprises a connecting block 210, a first spring 220, a force transmission rod 230, a protection tube 260 and an anchor head 270.
The conical body 110 is connected with the dowel bar 230 through the connecting block 210, the protection cavity 150 is provided with a limiting part, the dowel bar 230 is sleeved with the first spring 220 and clamped between the connecting block 210 and the limiting part, one end of the dowel bar 230 penetrates through the protection cavity 150, the other end of the dowel bar is connected with the anchor head 270, the dowel bar 230 is sleeved with the protection tube 260, one end of the dowel bar is connected with the protection cavity 150, the other end of the dowel bar is connected with the anchor head 270, an opening 156 is formed in the position, close to the conical body 110, of the protection cavity 150, the elastic sheet 120 is arranged at the opening 156, the thimble 140 is arranged between the elastic sheet 120 and the conical body 110, and the upper surface and/or the lower surface of the elastic sheet 120 are/or provided with gratings.
The protective cavity 150 may be, but is not limited to, a square cylinder, a hexagonal cylinder, or a hollow cylindrical cylinder. In this embodiment, the protection cavity 150 is a hollow cylinder, and the connection block 210 may be, but not limited to, a square, a rectangular parallelepiped, or a cylinder. In this embodiment, the protection cavity 150 is a hollow cylinder, the connection block 210 is a cylinder, and the inner diameter of the hollow cylinder may be larger than the diameter of the cylinder or equal to the diameter of the cylinder, as long as the connection block 210 can slide in the hollow cylinder, which is not limited specifically herein. The limiting part may be a limiting block or a limiting ring, as long as the limiting part can limit the spring, and is not specifically limited herein.
In this embodiment, the cross-sectional area of the anchor head 270 is greater than the cross-sectional area of the dowel bar 230. The shape and size of the anchor head 270 are not particularly limited, and may be set according to actual conditions. Through setting up anchor head 270 makes when fiber grating-based rock mass displacement testing arrangement 10 sets up in the pore of rock mass, the area of atress increases, and then changes more obviously when taking place the displacement to the testing result accuracy of fiber grating-based rock mass displacement testing arrangement 10 has been increased. The connection mode of the anchor head 270 and the dowel bar 230 can be welding or threaded connection, and the connection mode can be set according to actual conditions. In this embodiment, the anchor head 270 is threadably coupled to the dowel bar 230.
The protection tube 260 may be made of metal or hard plastic, as long as the protection tube 260 can protect the dowel bar 230. In the present embodiment, the protection tube 260 is made of PVC material.
The aperture of the protection cavity 150 is larger than the diameter of any part of the cone 110, and the diameter of the protection cavity 150 is also larger than the diameter of the first spring 220 and the diameter of the dowel bar 230. The cone 110, the connecting block 210, the dowel 230 and the first spring 220 can move in the protection cavity 150 through the above arrangement.
When a displacement test is carried out, the anchor head 270 is stressed and transmitted to the dowel bar 230, the connecting block 210 and the conical body 110 move along the stress direction of the dowel bar 230, the spring plate 120 moves up and down when the thimble 140 moves relative to the conical body 110, the grating pitch changes when the spring plate 120 moves up and down, the reflection wavelength of light changes due to the change of the grating pitch, and then the change of the rock mass displacement is obtained.
It should be noted that, in order to make the test result of the fiber grating-based rock mass displacement testing apparatus 10 more accurate, in this embodiment, the thimble 140 is disposed near the center of the elastic sheet 120, and when the conical body 110 moves relative to the protection cavity 150, the thimble 140 does not move along the moving direction of the conical body 110. In an initial state, the middle of the cone 110 contacts the thimble 140, and the resilient piece 120 is separated from the protection cavity 150. The number of the thimbles 140 may be one or more. In this embodiment, the number of the ejector pins 140 is one.
In order to ensure that the rock mass displacement testing device 10 based on the fiber bragg grating is not easily damaged in the displacement testing process. In this embodiment, the cone 110, the thimble 140, the protection cavity 150 and the dowel bar 230 may be made of hard metal materials.
Optionally, the grating is a fiber grating sheet, the elastic sheet 120 is a metal elastic sheet, and the fiber grating sheet is attached to the upper surface and the lower surface of the metal elastic sheet. The testing result of the rock mass displacement testing device 10 based on the fiber bragg grating is more accurate by simultaneously testing the grating pitch of the fiber bragg grating on the upper surface and the lower surface of the metal elastic sheet.
It should be noted that, by providing the first spring 220, when the force transmission rod 230 is subjected to a large force or undergoes an axial sudden change, the movement speed of the force transmission rod 230 is too fast, so that the thimble 140 and/or the elastic sheet 120 are damaged due to the sudden excessive force, thereby damaging the fiber bragg grating-based rock mass displacement testing device 10.
Please refer to fig. 2, in order to further avoid the axial sudden change of the fiber grating-based rock mass displacement testing device 10 during the axial displacement of the dowel bar 230, so that the testing result of the fiber grating-based rock mass displacement testing device 10 is more accurate. In this embodiment, the position-limiting portion includes a first position-limiting portion 152 and a second position-limiting portion 154, the first position-limiting portion 152 and the second position-limiting portion 154 are respectively disposed on the protection cavity 150 and located at two sides of the connection block 210, the first position-limiting portion 152 is close to the dowel bar 230, the first spring 220 is disposed between the first position-limiting portion 152 and the connection block 210, the dowel bar 200 further includes a second spring 240, the second spring 240 is disposed between the second position-limiting portion 154 and the connection block 210, and the conical body 110 is connected to one end of the second spring 240 close to the second position-limiting portion 154.
Optionally, the force transmission portion 200 further includes a connection rod 250, the connection rod 250 is connected between the connection block 210 and the conical body 110, the second spring 240 is sleeved on the connection rod 250 and is disposed between the second limiting portion 154 and the connection block 210, and the length of the connection rod 250 is greater than that of the second spring 240.
The cone 110 comprises a thick end and a thin end, and the manner of connecting the cone 110 with the connecting block 210 may be: the thin end of the cone 110 is connected to the connection block 210, or the thick end of the cone 110 is connected to the connection block 210. In this embodiment, the thin end of the cone 110 is connected to the connection block 210, and the thick end of the cone 110 extends out of the protection cavity 150. Specifically, the thin end of the conical body 110 is connected to the connecting block 210 through the connecting rod 250.
In order to avoid the problem that the axial position of the elastic sheet 120 changes in the up-and-down moving process or the elastic sheet 120 deforms due to stress to cause inaccurate test results in the test process of the fiber grating-based rock mass displacement test device 10. In this embodiment, a protection cylinder 160 is disposed at one end of the protection cavity 150 close to the opening 156, the protection cylinder 160 is sleeved on the protection cavity 150, and the protection cylinder 160 is a hollow cylinder.
The length of the protective cylinder 160 may be the same as the length of the opening 156 or may be greater than the length of the opening 156. In this embodiment, the length of the protective cylinder 160 is the same as the length of the opening 156. The axis of the protection cylinder 160 and the axis of the protection cavity 150 may be located on the same straight line or different straight lines. In this embodiment, the axis of the protection cylinder 160 and the axis of the protection cavity 150 are located on the same straight line. The sum of the radius of the protection cylinder 160, the radius of the protection cavity 150, and the length of the thimble 140 may be in any relationship, as long as a gap exists between the elastic sheet 120 and the protection cylinder 160 when the thimble 140 moves up and down. In this embodiment, the radius of the protection cylinder 160 is greater than the sum of the radius of the protection cavity 150 and the length of the thimble 140. Through the arrangement, the accuracy of displacement test of the rock mass displacement testing device 10 based on the fiber bragg grating is effectively guaranteed.
With reference to fig. 3 and 4, on the basis of the above, the present invention further provides a fiber grating-based rock mass displacement testing system, which includes a fiber grating wavelength demodulator 30 and a plurality of the fiber grating-based rock mass displacement testing devices 10, where the fiber grating wavelength demodulator 30 is connected to each of the fiber grating-based rock mass displacement testing devices 10 respectively. Optionally, the fiber grating-based rock mass displacement testing system further includes a terminal device 50, the terminal device 50 is connected to the fiber grating wavelength demodulator 30, and the terminal device 50 can calculate the displacement change of the fiber grating-based rock mass displacement testing device 10 according to the data in the fiber grating wavelength demodulator 30.
By adopting the fiber grating-based rock mass displacement testing system, the fiber grating wavelength demodulator 30 and the terminal equipment 50 can simultaneously obtain the distance measured by each fiber grating-based rock mass displacement testing device 10, and each fiber grating-based rock mass displacement testing device 10 can be arranged at the same position to realize combined testing and can also be arranged at different positions to test the rock mass displacement at different positions.
For example, when a plurality of the fiber grating-based rock mass displacement testing devices 10 are used for a combined test, each of the fiber grating-based rock mass displacement testing devices 10 is disposed in a borehole of the same rock mass, the anchor head 270 of each of the fiber grating-based rock mass displacement testing devices 10 is located at different depths of the through hole, the force measuring part 100 of each of the fiber grating-based rock mass displacement testing devices 10 may be located outside the rock mass or inside the rock mass, and in order to prevent the force measuring part 100 from being damaged in the using process, in this embodiment, optionally, the force measuring part 100 of each of the fiber grating-based rock mass displacement testing devices 10 is disposed inside the protective cover 70. When the rock mass displacement is measured, the grouting is carried out in the through holes, and after the grout is finally set, the anchor head 270 is tightly anchored with the surrounding rock mass, so that the detection of the rock mass displacement at different depths can be completed.
Because the fiber grating-based rock mass displacement testing system comprises the fiber grating-based rock mass displacement testing device 10, the fiber grating-based rock mass displacement testing system has all the characteristics of the fiber grating-based rock mass displacement testing device 10, and detailed description is omitted here.
In summary, the fiber grating-based rock mass displacement testing device 10 and system provided by the embodiment of the present invention includes the fiber grating-based rock mass displacement testing device 10 and the fiber grating wavelength demodulator 30, and the fiber grating-based rock mass displacement testing device 10 implements displacement testing by arranging the conical body 110, the elastic piece 120, the thimble 140, the protection cavity 150, the connection block 210, the dowel bar 230, the protection tube 260 and the anchor head 270, and arranging the grating on the elastic piece 120. Further, the first spring 220 and the second spring 240 are arranged to effectively prevent the thimble 140 and/or the elastic sheet 120 from being damaged due to sudden stress when the dowel bar 230 is moved at an excessively high speed when the dowel bar 230 is subjected to a large force or undergoes an axial sudden change, so that the fiber grating-based rock mass displacement testing device 10 is damaged. Further, the accuracy of the test result of the fiber grating-based rock mass displacement testing device 10 is effectively guaranteed by arranging the protection cylinder 160, and the situation that the fiber grating-based rock mass displacement testing device 10 is damaged in the test process is avoided.
It is noted that, herein, relational terms such as "first," "second," and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, article, or apparatus that comprises the element.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A rock mass displacement testing device based on fiber bragg gratings is characterized by comprising a force measuring part and a force transmission part, wherein the force measuring part is connected with the force transmission part;
the force measuring part comprises a conical body, an elastic sheet, a thimble and a protection cavity, and the force transmission part comprises a connecting block, a first spring, a force transmission rod, a protection tube and an anchor head;
the conical body is connected with the dowel bar through the connecting block, the protection cavity is provided with a limiting part, the first spring is sleeved on the dowel bar and clamped between the connecting block and the limiting part, one end of the dowel bar penetrates through the protection cavity, the other end of the dowel bar is connected with the anchor head, the protection tube is sleeved on the dowel bar, one end of the dowel bar is connected with the protection cavity, the other end of the dowel bar is connected with the anchor head, an opening is formed in the protection cavity close to the conical body, the spring plate is arranged at the opening, the thimble is arranged between the spring plate and the conical body, and the upper surface and/or the lower surface of the spring plate is/are provided with a grating;
the anchor head is stressed and transmitted to the dowel bar, the connecting block and the conical body move along the stress direction of the dowel bar, the grating pitch of the optical fiber is changed when the ejector pin moves up and down relative to the conical body, and the reflection wavelength of light in the optical fiber line is changed;
wherein the cross-sectional area of the anchor head is greater than the cross-sectional area of the force transfer rod.
2. The fiber grating-based rock mass displacement testing device of claim 1, wherein the limiting portion comprises a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion are respectively arranged in the protection cavity and located on two sides of the connecting block, the first limiting portion is close to the dowel bar, the first spring is arranged between the first limiting portion and the connecting block, the dowel portion further comprises a second spring, the second spring is arranged between the second limiting portion and the connecting block, and the conical body is connected with one end, close to the second limiting portion, of the second spring.
3. The fiber grating-based rock mass displacement testing device of claim 2, wherein the force transmission part further comprises a connecting rod, the connecting rod is connected between the connecting block and the conical body, and the second spring is sleeved on the connecting rod and arranged between the second limiting part and the connecting block.
4. The fiber grating-based rock mass displacement testing device of claim 1, wherein the cone comprises a thick end and a thin end, the thin end of the cone is connected with the connecting block, and the thick end of the cone extends out of the protection cavity.
5. The fiber grating-based rock mass displacement testing device of claim 1, wherein the grating is a fiber grating sheet, the elastic sheet is a metal elastic sheet, and the fiber grating sheet is attached to the upper surface and the lower surface of the metal elastic sheet.
6. The fiber grating-based rock mass displacement testing device of claim 1, wherein a protection cylinder is arranged at one end of the protection cavity close to the opening, the protection cylinder is sleeved on the protection cavity, and the protection cavity and the protection cylinder are hollow cylinders.
7. The fiber grating-based rock mass displacement testing device of claim 6, wherein the radius of the protection cavity is larger than the sum of the radius of the protection cylinder and the length of the thimble.
8. The fiber grating-based rock mass displacement testing device of claim 1, wherein the anchor head is in threaded connection with the dowel bar.
9. The fiber grating-based rock mass displacement testing device of claim 8, wherein the cone, the thimble, the protection cavity and the dowel bar are made of metal materials, and the protection tube is made of PVC materials.
10. A rock mass displacement test system based on fiber grating is characterized by comprising a fiber grating wavelength demodulator and a plurality of rock mass displacement test devices based on fiber grating according to any one of claims 1 to 9, wherein the fiber grating wavelength demodulator is respectively connected with each rock mass displacement test device based on fiber grating.
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| CN107632389B (en) * | 2017-09-20 | 2024-01-19 | 濮阳光电产业技术研究院 | Multi-wavelength fine tuning meter based on fiber grating |
| CN110940843A (en) * | 2019-11-15 | 2020-03-31 | 国网山西省电力公司大同供电公司 | High-frequency current demodulation device for fiber grating current sensor |
| CN111678448A (en) * | 2020-06-17 | 2020-09-18 | 江苏南水科技有限公司 | Miniaturized pop-up fiber bragg grating joint meter and packaging method |
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| CN206724889U (en) * | 2017-03-15 | 2017-12-08 | 中国科学院武汉岩土力学研究所 | Rock displacement test device and system based on fiber grating |
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