CN111856677A - Four-core optical cable capable of measuring bending radius and bending direction simultaneously - Google Patents
Four-core optical cable capable of measuring bending radius and bending direction simultaneously Download PDFInfo
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- CN111856677A CN111856677A CN202010881571.6A CN202010881571A CN111856677A CN 111856677 A CN111856677 A CN 111856677A CN 202010881571 A CN202010881571 A CN 202010881571A CN 111856677 A CN111856677 A CN 111856677A
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- optical cable
- optical fibers
- core
- bending
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
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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
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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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
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/255—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring radius of curvature
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/44384—Means specially adapted for strengthening or protecting the cables the means comprising water blocking or hydrophobic materials
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
A four-core optical cable capable of measuring bending radius and bending direction simultaneously belongs to the field of optical fiber sensing. The optical cable consists of a central reinforced core, 4 special optical fibers, a loose tube, cable core fillers, an inner sheath and an outer sheath. The 4 special optical fibers have the same structure and are leakage multi-layer gully optical fibers with high-refractive index and low-refractive index rings distributed alternately and gaps in outer-layer low-refractive index gullies, and the gaps in the outer-layer gullies of the 4 optical fibers face to be vertical and face to four directions of 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively. Due to gaps in the low-refractive-index grooves of the optical fibers, when the optical cable is bent along the gap direction, the optical fiber loss is obviously increased, the bending direction can be determined by combining the loss comparison of the adjacent 3 optical fibers, and the bending radius can be calculated according to the loss. The optical cable has great significance in the field of bridge and tunnel monitoring.
Description
Technical Field
The invention relates to a four-core optical cable capable of measuring bending radius and bending direction simultaneously, and belongs to the field of optical fiber sensing.
Background
The optical fiber bending sensor becomes one of the widely used optical fiber sensors, and has the advantages of no influence of an electromagnetic field, good insulation, high sensitivity, small volume and the like. The optical fiber bending sensor is a key device for realizing long-term and real-time online structure health monitoring, and has extremely important significance for ensuring the safety of large facilities and preventing and treating malignant and catastrophic accidents.
The current mainstream optical fiber bending sensor is an optical fiber bending sensor based on an optical fiber Bragg grating, the realization scheme is that the optical fiber Bragg grating is fixed on a certain measured piece needing to measure bending, the bending sensing is realized by utilizing the principle that the bending of the measured piece stretches or extrudes the optical fiber Bragg grating so as to generate measurable reflection wavelength drift, and the bending sensing method has the defect that one sensor can only obtain bending curvature information but cannot simultaneously obtain bending direction information. Other fiber bending sensors based on FP cavity, fiber coupling effect and other principles can only obtain bending curvature information at present, and cannot identify the bending direction.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a four-core optical cable capable of measuring the bending radius and the bending direction simultaneously.
The technical scheme of the invention is as follows:
the four-core optical cable capable of measuring the bending radius and the bending direction simultaneously comprises a central reinforced core, 4 leaked multi-layer gully optical fibers, a loose tube, cable core fillers, an inner sheath and an outer sheath.
The 4 leaky multi-layer ravine optical fibers have the same structure, high refractive index and low refractive index are distributed alternately, and gaps are formed in the outer layer of the ravine with low refractive index.
The low-refractive-index gapless inner ring of the 4 leaky multi-layer ravine optical fibers has 1 layer, and the low-refractive-index gapless outer ring has 1 to 2 layers.
The angle of the gap of the outer layer gully of the 4 leaked multi-layer gully optical fibers is 5-20 degrees.
The gaps of the outer layer of the 4 leaked multi-layer-gully optical fibers are vertical and face four directions of 0 degree, 90 degrees, 180 degrees and 270 degrees respectively.
The cable core filler is made of water-blocking ointment.
The inner jacket material is a double-sided plastic-aluminum tape.
The outer sheath material is polyethylene.
The beneficial effects of the invention are as follows: a four-core optical cable capable of measuring the bending radius and the bending direction simultaneously is designed, and when the optical cable is bent, the bending direction can be determined by combining the loss comparison of 2-3 adjacent optical fibers; then, based on the magnitude of the loss, the bend radius can be calculated. The optical cable has great significance in the field of bridge and tunnel monitoring.
Drawings
Fig. 1 is a schematic cross-sectional view of a refractive index profile of a leaky 3-layer-gully fiber optic cable according to an embodiment of the invention.
Fig. 2 is a cross-sectional view of a leakage 3-layer ravine refractive index optical fiber cable according to an embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view of a leakage 2-layer ravine refractive index profile of an optical fiber cable according to an embodiment of the present invention.
Fig. 4 is a cross-sectional view of a leakage 2-layer ravine fiber optic cable refractive index according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example one
The 3-layer leakage gully fiber four-core optical cable with the bending radius and the bending direction can be measured simultaneously, and the method is shown in figures 1 and 2.
The center of the optical cable is a reinforced core 1, 4 leaky 3-layer gully optical fibers 2, 3, 4 and 5 with the same structure, a loose tube 6, a cable core filler 7, an inner sheath 8 and an outer sheath 9 are uniformly distributed around the reinforced core 1.
The 4 leaky multi-layer ravine optical fibers 2, 3, 4 and 5 have the same structure, high refractive index and low refractive index are distributed alternately, and gaps are formed in the outer layer of the ravine with low refractive index.
The 4 leaky multi-layer-ravine optical fibers 2, 3, 4, 5 include a high- index core 10, 1 low-index un-notched inner ring 11, and 2 low-index notched outer rings 12.
The angle of the gaps of the outer layer gully of the 4 leaked multi-layer gully optical fibers 2, 3, 4 and 5 is 15 degrees.
The gaps of the outer layer ravines of the 4 leaked multilayer ravine optical fibers 2, 3, 4 and 5 are vertical and face to four directions of 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively.
The cable core filler 7 is made of water-blocking ointment.
The inner sheath 8 is made of a double-sided plastic-aluminum tape.
The outer sheath 9 is made of polyethylene.
Example two
The leakage 2-layer ravines of the bend radius and bend direction of the fiber optic quad-core cable can be measured simultaneously, see fig. 3 and 4.
The center of the optical cable is a reinforced core 1, 4 leaky 3-layer gully optical fibers 2, 3, 4 and 5 with the same structure, a loose tube 6, a cable core filler 7, an inner sheath 8 and an outer sheath 9 are uniformly distributed around the reinforced core 1.
The 4 leaky multi-layer ravine optical fibers 2, 3, 4 and 5 have the same structure, high refractive index and low refractive index are distributed alternately, and gaps are formed in the outer layer of the ravine with low refractive index.
The 4 leaky multi-layer-ravine optical fibers 2, 3, 4, 5 include a high- index core 10, 1 low-index un-notched inner ring 11, and 1 low-index notched outer ring 12.
The angle of the gaps of the outer layer gully of the 4 leaked multi-layer gully optical fibers 2, 3, 4 and 5 is 15 degrees.
The gaps of the outer layer ravines of the 4 leaked multilayer ravine optical fibers 2, 3, 4 and 5 are vertical and face to four directions of 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively.
The cable core filler 7 is made of water-blocking ointment.
The inner sheath 8 is made of a double-sided plastic-aluminum tape.
The outer sheath 9 is made of polyethylene.
Claims (8)
1. A four-core optical cable capable of measuring a bending radius and a bending direction simultaneously, characterized in that: the optical cable consists of a central reinforced core, 4 leaky multi-layer gully optical fibers, a loose tube, cable core fillers, an inner sheath and an outer sheath.
2. A four-core optical cable capable of simultaneously measuring a bending radius and a bending direction according to claim 1, wherein: the 4 leaky multi-layer ravine optical fibers have the same structure, high refractive index and low refractive index are distributed alternately, and gaps are formed in the outer layer of the ravine with low refractive index.
3. A four-core optical cable capable of simultaneously measuring a bending radius and a bending direction according to claim 1, wherein: the low-refractive-index gapless inner ring of the 4 leaky multi-layer ravine optical fibers has 1 layer, and the low-refractive-index gapless outer ring has 1 to 2 layers.
4. A four-core optical cable capable of simultaneously measuring a bending radius and a bending direction according to claim 1, wherein: the angle of the gap of the outer layer gully of the 4 leaked multi-layer gully optical fibers is 5-20 degrees.
5. A four-core optical cable capable of simultaneously measuring a bending radius and a bending direction according to claim 1, wherein: the gaps of the outer layer of the 4 leaked multi-layer-gully optical fibers are vertical and face four directions of 0 degree, 90 degrees, 180 degrees and 270 degrees respectively.
6. A four-core optical cable capable of simultaneously measuring a bending radius and a bending direction according to claim 1, wherein: the cable core filler is made of water-blocking ointment.
7. A four-core optical cable capable of simultaneously measuring a bending radius and a bending direction according to claim 1, wherein: the inner jacket material is a double-sided plastic-aluminum tape.
8. A four-core optical cable capable of simultaneously measuring a bending radius and a bending direction according to claim 1, wherein: the outer sheath material is polyethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010881571.6A CN111856677A (en) | 2020-08-28 | 2020-08-28 | Four-core optical cable capable of measuring bending radius and bending direction simultaneously |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010881571.6A CN111856677A (en) | 2020-08-28 | 2020-08-28 | Four-core optical cable capable of measuring bending radius and bending direction simultaneously |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111856677A true CN111856677A (en) | 2020-10-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010881571.6A Pending CN111856677A (en) | 2020-08-28 | 2020-08-28 | Four-core optical cable capable of measuring bending radius and bending direction simultaneously |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111856677A (en) |
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2020
- 2020-08-28 CN CN202010881571.6A patent/CN111856677A/en active Pending
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