CN112345129A - Optical fiber transverse stress detector - Google Patents
Optical fiber transverse stress detector Download PDFInfo
- Publication number
- CN112345129A CN112345129A CN202011348326.5A CN202011348326A CN112345129A CN 112345129 A CN112345129 A CN 112345129A CN 202011348326 A CN202011348326 A CN 202011348326A CN 112345129 A CN112345129 A CN 112345129A
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- optical fiber
- transverse stress
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- connector
- stress detector
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 55
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 230000001681 protective effect Effects 0.000 claims description 13
- 230000035882 stress Effects 0.000 abstract description 44
- 238000012544 monitoring process Methods 0.000 abstract description 15
- 238000009434 installation Methods 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000032683 aging Effects 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000011900 installation process Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000000253 optical time-domain reflectometry Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The invention relates to an optical fiber transverse stress detector which comprises a plurality of assembly units connected in sequence from top to bottom; the assembling units are cylindrical, the upper surfaces of the assembling units are provided with grooves, the lower surfaces of the assembling units are provided with convex parts, and the convex parts and the grooves of the adjacent assembling units are matched with each other; the periphery of the assembly unit is provided with a plurality of longitudinal notches for mounting optical fibers. The bellying of an equipment unit cooperatees with the recess of another equipment unit, assemble in proper order and form detector overall structure, the periphery of equipment unit is equipped with a plurality of vertical notches, the outside of detector overall structure forms the vertical notch that link up with installation test optic fibre, when monitoring external environment, can insert the detector in the mounting hole that needs monitor transverse stress, when monitoring environment production swing, optic fibre transverse stress detector can high accuracy and high ageing production deformation.
Description
Technical Field
The invention belongs to the field of optical fiber sensing, and particularly relates to an optical fiber transverse stress detector.
Background
Rescue environment monitoring is an important work in safety monitoring, and has the characteristics of large scale, large emergency rescue environment difference, real-time dynamic monitoring and the like, so that some conventional point-type monitoring means cannot meet the requirements. The optical time domain reflectometer works through a backward Rayleigh scattering signal generated in a measured optical fiber, so that the optical time domain reflectometer can react to the transverse stress of the light and further can measure the loss of the optical fiber due to bending.
In the prior art, the optical fiber is usually installed by adopting a method of directly burying the optical fiber, and the optical fiber needs great transverse stress and displacement to generate obvious visible loss, so that the problem that the transverse stress change reaction is insensitive and untimely exists in an actual monitoring environment.
Therefore, it is desirable to provide an optical fiber transverse stress detector which can effectively solve the problem that the optical fiber is insensitive and untimely to the transverse stress change by embedding the optical fiber.
Disclosure of Invention
The invention aims to provide an optical fiber transverse stress detector, which solves the problems that in the prior art, an optical fiber is insensitive and untimely to transverse stress change in a mode of embedding the optical fiber.
In order to achieve the above object, the present invention provides an optical fiber transverse stress detector, comprising a plurality of assembly units connected in sequence from top to bottom;
the assembling units are cylindrical, grooves are formed in the upper surfaces of the assembling units, protruding parts are formed in the lower surfaces of the assembling units, and the protruding parts of the adjacent assembling units are matched with the grooves; the periphery of the assembly unit is provided with a plurality of longitudinal notches, and the longitudinal notches are used for installing optical fibers.
Optionally, a through hole is formed in the center of the assembly unit;
the optical fiber transverse stress detector further comprises a connector, the length of the connector is larger than the total height of the assembling units, and the connector can be inserted into the through holes of the assembling units to connect the assembling units.
Optionally, the connector is tubular;
the optical fiber transverse stress detector further comprises a collimation mounting rod, the length of the collimation mounting rod is larger than that of the connector, and the collimation mounting rod can be inserted into the connector.
Optionally, the grooves of the assembly unit are arranged parallel or perpendicular with respect to the protrusions.
Optionally, in two adjacent assembly units, the groove of one assembly unit is arranged in parallel with respect to the protrusion thereof, and the groove of the other assembly unit is arranged perpendicularly with respect to the protrusion thereof.
Optionally, the protective cap is disposed at one end of the plurality of assembly units connected in sequence.
Optionally, the protective cap is a soft rubber protective cap.
Optionally, the connector is a resilient connector.
Optionally, the groove and the protrusion are both strip-shaped and are arranged along the radial direction through the center of the circle of the assembly unit.
Optionally, the longitudinal slots of the plurality of assembly units are aligned with each other after assembly to form a through slot running from top to bottom for mounting the optical fiber.
The invention has the beneficial effects that:
in the equipment unit assembling process, the bellying of an equipment unit cooperatees with the recess of another equipment unit, assemble in proper order and form detector overall structure, the periphery of equipment unit is equipped with a plurality of vertical notches, the outside of the detector overall structure who assembles can form the vertical notch that link up with installation test optic fibre, when monitoring external environment, can insert the detector in the hole that needs monitoring transverse stress, when monitoring environment production transverse stress, optic fibre transverse stress detector can produce obvious high ageing deformation because of sliding, the problem that the mode through burying optic fibre underground makes optic fibre insensitive and untimely to transverse stress change reaction has effectively been solved. Meanwhile, the rod-shaped detector is convenient to install.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a schematic structural diagram of an optical fiber transverse stress detector according to an embodiment of the present invention.
FIG. 2 shows a bottom view of an assembled unit of a fiber transverse stress detector according to one embodiment of the invention.
FIG. 3 shows a side view of the groove of the assembled unit of the fiber transverse stress detector in parallel arrangement with respect to its boss according to one embodiment of the present invention.
Fig. 4 shows a schematic structural view of the groove of the assembly unit of the optical fiber transverse stress detector according to one embodiment of the invention in parallel arrangement with respect to the boss thereof.
FIG. 5 shows a side view of the groove of the assembled unit of the fiber transverse stress detector in a perpendicular arrangement with respect to its boss according to one embodiment of the present invention.
Fig. 6 shows a schematic structural view of the groove of the assembly unit of the optical fiber transverse stress detector according to one embodiment of the present invention, which is vertically arranged with respect to the boss thereof.
1. An assembly unit; 11. a groove; 12. a boss portion; 13. a longitudinal slot; 14 through holes; 2. a connector; 3. a collimating mounting bar; 4. protective cap
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
The invention relates to an optical fiber transverse stress detector which comprises a plurality of assembly units connected in sequence from top to bottom;
the assembling units are cylindrical, the upper surfaces of the assembling units are provided with grooves, the lower surfaces of the assembling units are provided with convex parts, and the convex parts and the grooves of the adjacent assembling units are matched with each other; the periphery of the assembly unit is provided with a plurality of longitudinal notches for mounting optical fibers.
Specifically, in the equipment unit assembling process, the bellying of an equipment unit cooperatees with the recess of another equipment unit, assemble in proper order and form detector overall structure, the periphery of equipment unit is equipped with a plurality of vertical notches, the outside of the detector overall structure who assembles forms the vertical notch that link up is with installation test optic fibre, when monitoring external environment, can insert the detector in the hole that needs monitoring transverse stress, when monitoring environment production is swung, can produce horizontal stress, optic fibre transverse stress detector can high accuracy and high ageing production deformation, effectively solved through burying the mode of burying optic fibre underground make optic fibre insensitive and untimely problem of transverse stress change reaction.
In one example, the center of the assembly unit is provided with a through hole;
the optical fiber transverse stress detector also comprises a connector, the length of the connector is greater than the total height of the assembling units, and the connector can be inserted into the through holes of the assembling units so as to connect the assembling units;
the connector is an elastic connector.
Specifically, the connector is a hollow straight rod with certain elasticity, all the assembling units are assembled into a whole through the through holes of the assembling units, and the connector is used for shape preservation and sensitivity control of the assembling units after installation;
furthermore, the number of the assembly units can be flexibly selected according to actual conditions, and the assembly units with different numbers can be assembled according to the required length of the detector.
In one example, the connector is tubular;
the optical fiber transverse stress detector further comprises a collimation mounting rod, the length of the collimation mounting rod is larger than that of the connector, and the collimation mounting rod can be inserted into the connector.
Specifically, the alignment mounting rod is arranged in the connector before the assembly unit is mounted, and the alignment mounting rod can provide integral rigidity for the detector in the process of mounting the detector; in other embodiments, the assembly unit may also have a dual-bore configuration, in which case the alignment mounting rods and connectors may be separately mounted in different bores, in which case the connectors are not tubular, which configuration may keep the fiber transverse stress detector from significantly bending during installation.
In one example, the grooves of the assembly unit are arranged in parallel or perpendicular with respect to the protrusions;
in two adjacent assembly units, the groove of one assembly unit is arranged in parallel relative to the lug boss of the other assembly unit, and the groove of the other assembly unit is arranged vertically relative to the lug boss of the other assembly unit.
Specifically, in the actual installation process, the protruding portion of one assembly unit is inserted into the groove of the adjacent assembly unit, after splicing, the protruding portion can axially slide in the groove, and the sensitivity of the detector can be influenced due to the fact that the stress direction and the sliding direction are different.
In one example, the protective cap is arranged at one end of the plurality of assembly units which are connected in sequence.
In particular, the protective cap is arranged at one end of a plurality of assembly units which are connected in sequence, the protective cap is inserted into the hole downwards in the actual installation process, the use of the protective cap is favorable for reducing the light loss caused by the excessive stress on the optical fiber caused by the bending of the head of the detector, and the damage of the detection optical fiber caused by the insertion of the detector into the installation hole can also be prevented.
In one example, the groove and the protrusion are both bar-shaped and are arranged in a radial direction through a center of the assembly unit.
Specifically, recess and bellying are the strip, and set up along radial direction through the centre of a circle of equipment unit, and this kind of structural design makes the installation of equipment unit more convenient, can directly insert the bellying of an equipment unit in the recess of adjacent equipment unit during the installation, and easy operation is convenient, effectively uses manpower sparingly cost.
In one example, the longitudinal slots of a plurality of assembly units are aligned with one another after assembly, forming a through slot running through from top to bottom for mounting optical fibers.
Specifically, the detector is laterally provided with a vertical through slot, the detection optical fiber is arranged in the vertical slot, and the detection optical fiber can be fixed in an adhesion or seal mode. This optical routing is much more sensitive to transverse stresses than the optical fiber winding.
Further, each assembly unit is preferably four longitudinal slots arranged on average.
Examples
As shown in fig. 1 and 2, an optical fiber transverse stress detector according to the present invention includes a plurality of assembly units 1 connected in sequence from top to bottom; the assembling units 1 are cylindrical, the upper surfaces of the assembling units are provided with grooves 11, the two grooves are vertical to each other, the lower surfaces of the assembling units are provided with convex parts 12, and the convex parts 12 of the adjacent assembling units 1 are matched with the grooves 11; the outer periphery of the assembly unit 1 is provided with a plurality of longitudinal notches 13, the longitudinal notches 13 of the plurality of assembly units 1 are aligned with each other to form a through groove penetrating from top to bottom, and the longitudinal notches 13 are used for installing optical fibers. The center of the assembly unit is provided with a through hole 14. The optical fiber transverse stress detector further comprises a connector 2, the length of the connector 2 is greater than the total height of the assembling units 1, and the connector 2 can be inserted into the through hole 14 of the assembling unit 1 to connect the assembling units 1; the connector 2 is tubular. The optical fiber transverse stress detector further comprises a collimation mounting rod 3, the length of the collimation mounting rod 3 is larger than that of the connector 2, and the collimation mounting rod 3 can be inserted into the connector 2. The optical fiber transverse stress detector further comprises a protective cap 4, and the protective cap 4 is arranged at one end of the plurality of assembly units 1 which are connected in sequence.
As shown in fig. 3 to 6, there are two sets of grooves 11 of the assembly unit 1, which are arranged in parallel and perpendicular to the protrusions 12, so as to facilitate the unification of the assembly unit; in two adjacent assembly units 1, the groove 11 of one assembly unit 1 is arranged in parallel relative to the convex part 12 thereof, and the groove 11 of the other assembly unit 1 is arranged vertically relative to the convex part 12 thereof. The grooves 11 and the protrusions 12 are both strip-shaped and are arranged along the radial direction through the center of the assembly unit 1.
In conclusion, in the assembling process of the assembling units, the protruding part of one assembling unit is matched with the groove of the other assembling unit to sequentially assemble the probe integral structure, the periphery of the assembling unit is provided with a plurality of longitudinal notches, and the outer side of the probe integral structure is provided with a through longitudinal notch to install the test optical fiber.
In the installation process, an installation hole is drilled in an area needing to monitor the transverse stress change, the diameter of the installation hole is slightly larger than that of the sensing detector, the whole sensor and the collimation installation rod are inserted into the installation hole needing to monitor the transverse stress change, and the sensor integrally enters the installation hole by virtue of the rigidity of the collimation installation rod; and pouring diluted fine mortar into the holes to fill the redundant space, then pulling out the collimation mounting rod, accessing the detector into an optical fiber network, and monitoring by using OTDR.
When the monitoring environment generates oscillation, the optical fiber transverse stress detector can generate deformation with high precision and high aging, and the problems that the optical fiber is insensitive and untimely to transverse stress change in a mode of embedding the optical fiber are effectively solved.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. The optical fiber transverse stress detector is characterized by comprising a plurality of assembly units which are sequentially connected from top to bottom;
the assembling units are cylindrical, grooves are formed in the upper surfaces of the assembling units, protruding parts are formed in the lower surfaces of the assembling units, and the protruding parts of the adjacent assembling units are matched with the grooves; the periphery of the assembly unit is provided with a plurality of longitudinal notches, and the longitudinal notches are used for installing optical fibers.
2. The optical fiber transverse stress detector according to claim 1, wherein the center of the assembly unit is provided with a through hole;
the optical fiber transverse stress detector further comprises a connector, the length of the connector is larger than the total height of the assembling units, and the connector can be inserted into the through holes of the assembling units to connect the assembling units.
3. The fiber transverse stress detector of claim 2, wherein said connector is tubular;
the optical fiber transverse stress detector further comprises a collimation mounting rod, the length of the collimation mounting rod is larger than that of the connector, and the collimation mounting rod can be inserted into the connector.
4. The optical fiber transverse stress detector according to claim 1, wherein the groove of the assembly unit is disposed in parallel or perpendicular with respect to the protrusion.
5. The optical fiber transverse stress detector according to claim 4, wherein the grooves of one of the two adjacent assembly units are arranged in parallel with respect to the protruding portion thereof, and the grooves of the other assembly unit are arranged perpendicularly with respect to the protruding portion thereof.
6. The transverse fiber stress sensor of claim 1, further comprising a protective cap disposed at one end of the plurality of sequentially connected assembly units.
7. The optical fiber transverse stress detector according to claim 6, wherein the protective cap is a soft rubber protective cap.
8. The fiber optic transverse stress detector of claim 2, wherein said connector is an elastomeric connector.
9. The optical fiber transverse stress detector according to claim 1, wherein the groove and the protrusion are both bar-shaped and arranged in a radial direction through a center of the assembly unit.
10. The fiber optic transverse stress detector of claim 1, wherein the longitudinal slots of the plurality of assembled units are aligned with one another after assembly to form a top-to-bottom through slot for mounting an optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011348326.5A CN112345129A (en) | 2020-11-26 | 2020-11-26 | Optical fiber transverse stress detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011348326.5A CN112345129A (en) | 2020-11-26 | 2020-11-26 | Optical fiber transverse stress detector |
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| Publication Number | Publication Date |
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| CN112345129A true CN112345129A (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011348326.5A Pending CN112345129A (en) | 2020-11-26 | 2020-11-26 | Optical fiber transverse stress detector |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454021A (en) * | 2013-08-15 | 2013-12-18 | 中国矿业大学 | Tunnel surrounding rock stress monitoring device based on fiber grating sensing |
| CN107328370A (en) * | 2017-06-23 | 2017-11-07 | 中国科学院武汉岩土力学研究所 | The fiber grating aperture deformation-sensor of long-term measurement surrouding rock stress |
| CN207197457U (en) * | 2017-09-15 | 2018-04-06 | 北京为韵科技有限公司 | A kind of distribution type fiber-optic dough deformation sensor |
| US20190192124A1 (en) * | 2009-05-04 | 2019-06-27 | Intelligent Fiber Optic Systems, Inc. | Steerable Shape Sensing Biopsy Needle |
| CN110044526A (en) * | 2019-05-10 | 2019-07-23 | 吉林大学 | A kind of optical fiber optical grating stress sensor and its processing and scaling method |
| CN110657905A (en) * | 2019-08-27 | 2020-01-07 | 山东大学 | Tunnel surrounding rock internal stress distributed monitoring device, construction method and monitoring method |
| CN111157161A (en) * | 2020-01-03 | 2020-05-15 | 中国矿业大学 | In-situ multipoint coal rock mass three-dimensional stress monitoring system and monitoring method |
| CN213336580U (en) * | 2020-11-26 | 2021-06-01 | 唐山市智明电子科技有限公司 | Optical fiber transverse stress detector |
-
2020
- 2020-11-26 CN CN202011348326.5A patent/CN112345129A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190192124A1 (en) * | 2009-05-04 | 2019-06-27 | Intelligent Fiber Optic Systems, Inc. | Steerable Shape Sensing Biopsy Needle |
| CN103454021A (en) * | 2013-08-15 | 2013-12-18 | 中国矿业大学 | Tunnel surrounding rock stress monitoring device based on fiber grating sensing |
| CN107328370A (en) * | 2017-06-23 | 2017-11-07 | 中国科学院武汉岩土力学研究所 | The fiber grating aperture deformation-sensor of long-term measurement surrouding rock stress |
| CN207197457U (en) * | 2017-09-15 | 2018-04-06 | 北京为韵科技有限公司 | A kind of distribution type fiber-optic dough deformation sensor |
| CN110044526A (en) * | 2019-05-10 | 2019-07-23 | 吉林大学 | A kind of optical fiber optical grating stress sensor and its processing and scaling method |
| CN110657905A (en) * | 2019-08-27 | 2020-01-07 | 山东大学 | Tunnel surrounding rock internal stress distributed monitoring device, construction method and monitoring method |
| CN111157161A (en) * | 2020-01-03 | 2020-05-15 | 中国矿业大学 | In-situ multipoint coal rock mass three-dimensional stress monitoring system and monitoring method |
| CN213336580U (en) * | 2020-11-26 | 2021-06-01 | 唐山市智明电子科技有限公司 | Optical fiber transverse stress detector |
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