CN214067452U - 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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- CN214067452U CN214067452U CN202021828236.1U CN202021828236U CN214067452U CN 214067452 U CN214067452 U CN 214067452U CN 202021828236 U CN202021828236 U CN 202021828236U CN 214067452 U CN214067452 U CN 214067452U
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- 238000005452 bending Methods 0.000 title claims abstract description 44
- 230000003287 optical effect Effects 0.000 title claims abstract description 21
- 239000013307 optical fiber Substances 0.000 claims abstract description 42
- 239000000945 filler Substances 0.000 claims abstract description 10
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000002674 ointment Substances 0.000 claims description 4
- -1 polyethylene Polymers 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 description 6
- 230000007547 defect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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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 (5)
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 multilayer gully optical fibers, a loose sleeve, cable core fillers, an inner sheath and an outer sheath from inside to outside; a loose tube is nested outside the 4 leaky multi-layer gully optical fibers, the inner side of the loose tube is jointed with the central reinforced core, and the outer side of the loose tube is jointed with the inner sheath; the cable core filler is filled in the gap between the loose tube and the central reinforced core and the inner sheath; the outer sheath is embedded outside the inner sheath; 4 leaky multi-layer gully optical fibers are identical in size and structure and are uniformly arranged on the outer side of the central reinforced core, high refractive index and low refractive index are alternately distributed, and gaps are formed in outer-layer low refractive index gullies; the low-refractive-index gapless inner ring of the 4 leaky multi-layer gully optical fibers is provided with 1 layer, and the low-refractive-index gapless outer ring is provided with 1 to 2 layers; 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; determining the bending direction by combining the loss comparison of 2-3 adjacent optical fibers; and calculating the bending radius according to the loss.
2. 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.
3. 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.
4. 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.
5. 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 |
|---|---|---|---|
| CN202021828236.1U CN214067452U (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 |
|---|---|---|---|
| CN202021828236.1U CN214067452U (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 |
|---|---|
| CN214067452U true CN214067452U (en) | 2021-08-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021828236.1U Expired - Fee Related CN214067452U (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) | CN214067452U (en) |
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2020
- 2020-08-28 CN CN202021828236.1U patent/CN214067452U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210827 |