CN116974022A - Towed acoustic sensitive optical cable - Google Patents
Towed acoustic sensitive optical cable Download PDFInfo
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- CN116974022A CN116974022A CN202310905744.7A CN202310905744A CN116974022A CN 116974022 A CN116974022 A CN 116974022A CN 202310905744 A CN202310905744 A CN 202310905744A CN 116974022 A CN116974022 A CN 116974022A
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- acoustic sensing
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- 230000003287 optical effect Effects 0.000 title claims abstract description 44
- 239000013307 optical fiber Substances 0.000 claims abstract description 91
- 239000012792 core layer Substances 0.000 claims abstract description 63
- 239000010410 layer Substances 0.000 claims abstract description 32
- 239000003292 glue Substances 0.000 claims abstract description 31
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 14
- 238000005452 bending Methods 0.000 claims description 13
- 238000012856 packing Methods 0.000 claims description 9
- 238000005253 cladding Methods 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 7
- 239000011247 coating layer Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims 1
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- 238000000576 coating method Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 23
- 230000035945 sensitivity Effects 0.000 abstract description 19
- 238000013461 design Methods 0.000 description 9
- 229920001971 elastomer Polymers 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 4
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
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- 230000008023 solidification Effects 0.000 description 3
- 229920002943 EPDM rubber Polymers 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 241000251730 Chondrichthyes Species 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 206010070834 Sensitisation Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
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- 239000000806 elastomer Substances 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
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- 229920000915 polyvinyl chloride Polymers 0.000 description 1
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- 230000008313 sensitization Effects 0.000 description 1
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Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
-
- 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
- G02B6/4407—Optical cables with internal fluted support member
Abstract
The invention discloses a towed acoustic sensitive optical cable, and relates to the field of optical cables. The invention provides a drag type sound sensitive optical cable which comprises a cable core layer and an elastic sheath layer from inside to outside, wherein a groove is spirally formed in the outer peripheral surface of the cable core layer; an acoustic sensing optical fiber is arranged in the groove; elastic glue is filled between the groove and the acoustic sensing optical fiber; the Young modulus M5 of the elastic glue after curing is 0.56 Gpa-0.85 Gpa; the elastic modulus of the acoustic sensing optical fiber is 0.5 Gpa-0.8 Gpa; the elastic modulus of the cable core layer is 0.55 Gpa-0.95 Gpa. The transmission distance of the towed acoustic sensitive optical cable is longer, and the acoustic pressure sensitivity is better.
Description
Technical Field
The invention relates to the field of optical cables, in particular to a towed acoustic sensitive optical cable.
Background
The backscattering characteristics of the optical fiber are subject to changes in external physical quantities, and changes in wavelength, power or phase occur. The distributed optical fiber sensing technology utilizes the characteristics and is matched with a proper sensing optical fiber to realize continuous sensing along the length direction of the optical fiber. Compared with other optical fiber sensing technologies, the sensor in the distributed optical fiber sensing technology has only one optical fiber for simultaneously sensing and transmitting light, and the sensing part has simple structure and convenient use; the information acquisition cost in unit length is greatly reduced, and the cost performance is high.
The distributed optical fiber sensing technology is widely applied to the fields of perimeter security protection, distributed temperature sensing, structural monitoring and the like at present, and is particularly suitable for safety monitoring of natural gas, petroleum pipelines and the like and early warning monitoring of civil facilities such as bridges, large buildings and the like in civil engineering. Further progress in distributed fiber optic acoustic sensing technology is relatively slow and one of the important reasons impeding its development is the lack of a sensing element that is sensitive to high sound.
In order to solve the above problems, chinese patent publication No. CN111007606a discloses an acoustic sensitive optical fiber cable and a method for manufacturing the same, wherein the acoustic sensitive optical fiber cable comprises a supporting mandrel, an optical fiber and an outer protective sleeve, and is characterized in that: the supporting mandrel is polysulfone, polycarbonate, polyurethane, polyolefin, polyvinyl chloride or rubber, the optical fiber is a single-mode optical fiber, the single-mode optical fiber is tightly wound on the supporting mandrel at equal intervals to realize the acoustic sensitization of the optical fiber cable, and the rigidity of the mandrel and the whole optical cable is greatly reduced through reasonable material selection and structural design, so that the supporting mandrel generates higher deformation than the common optical cable under the same vibration excitation, and the acoustic sensing performance of the optical cable is improved; however, the position of the single-mode optical fiber tightly wound on the support mandrel at equal intervals in the Chinese patent cannot be fixed, and the wound optical fiber is easy to displace during use, so that the propagation loss of the conducted acoustic signal is larger, and the acoustic pressure sensitivity of the acoustic-sensitive optical fiber cable is reduced; however, by adopting the conventional method for fixing the position of the single-mode fiber, the sound pressure sensitivity and the transmission distance of the sound-sensitive optical cable are still poor.
Accordingly, the applicant has improved an acoustically-sensitive optical fiber cable to obtain an acoustically-sensitive optical fiber cable having a longer transmission distance and better acoustic pressure sensitivity to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the existing technical problems. The invention provides a drag type sound sensitive optical cable which comprises a cable core layer and an elastic sheath layer from inside to outside, wherein a groove is spirally formed in the outer peripheral surface of the cable core layer; an acoustic sensing optical fiber is arranged in the groove; elastic glue is filled between the groove and the acoustic sensing optical fiber; the Young modulus M5 of the elastic glue after curing is 0.56 Gpa-0.85 Gpa; the elastic modulus of the acoustic sensing optical fiber is 0.5 Gpa-0.8 Gpa; the elastic modulus of the cable core layer is 0.55 Gpa-0.95 Gpa. The grooves are spirally formed in the outer peripheral surface of the cable core layer, so that the tightly wound positions of the tightly wound acoustic sensing optical fibers on the outer peripheral surface of the cable core layer can be fixed, the tightly wound acoustic sensing optical fibers are prevented from moving, the tightly wound pitch is changed, and the sensing precision is affected; elastic glue is filled between the grooves and the acoustic sensing optical fibers, so that the acoustic sensing optical fibers are in full close contact with the cable core layer, loss and distortion of acoustic sensing signals between the acoustic sensing optical fibers and the cable core layer are reduced, and acoustic sensing sensitivity is improved; after the elastic glue is solidified, the Young modulus M5 is 0.56 Gpa-0.85 Gpa, the elastic modulus of the acoustic sensing optical fiber is 0.5 Gpa-0.8 Gpa, the elastic modulus of the cable core layer is 0.55 Gpa-0.95 Gpa, the elastic modulus of the cable core layer, the elastic glue and the elastic modulus of the acoustic sensing optical fiber are matched to form a modulus gradient from large to small in sequence, the sound pressure sensitivity and the transmission length are improved, and the signal transmission effectiveness of acoustic sensing is further enhanced.
Further, the ratio of the length of the helically arranged grooves to the length of the cable core layer is not more than 10:1.
Further, the cable core layer is made of a blend of polypropylene with the hardness H1 of 75A-85A and ethylene propylene diene monomer; the hardness H1 of the cable core layer is 75A-85A, so that the vibration resonance of sound waves in the cable core layer can be conducted, the transmission waveform of the sound waves is maintained, meanwhile, the transmission speed of the sound waves can be increased, the transmission distance is enhanced, the problem that the sensing optical fiber is not tightly contacted with the cable core layer due to the fact that the cable core layer is too hard, and the sensing performance is reduced is solved, and therefore better sound sensing characteristics can be achieved, and the fidelity and the transmission distance of sound sensing are enhanced.
Further, the cable core layer is of a solid cylinder structure; the diameter D4 of the cable core layer is 10-25 mm; the diameter of the cable core layer is smaller, the overall structural design of the light-weight dragging type acoustic sensitive optical cable can be realized, the volume and the weight of the overall optical cable are reduced, and the dragging and releasing convenience is improved.
Further, the grooves are square grooves; the depth D3 of the square groove is 0.5-1.2 mm, and the width T3 is 0.5-1.2 mm, wherein the size relation between the width T3 and the depth D3 is as follows: t3> D3.
Further, the acoustic sensing optical fiber comprises a high bending resistance low-loss optical fiber and a tight packing material layer from inside to outside;
furthermore, the high bending resistance low loss optical fiber adopts a single mode optical fiber, and comprises a core layer, a glass cladding layer and an outer coating layer from inside to outside; the numerical aperture NA of the high bending resistance low loss optical fiber is 0.16-0.21; the diameter D22 of the outer coating layer is 0.165-0.245 mm; the diameter D22 of the glass cladding is 0.07 mm-0.125 mm; the bending resistance of the flexible ultra-fine acoustic sensing optical fiber is enhanced, more acoustic sensing optical fibers can be wound at a smaller pitch, the sensitivity of the dragging type acoustic sensing optical cable is improved, and the transmission distance of the dragging type acoustic sensing optical cable is increased.
Further, the tightly packed material layer is made of thermoplastic polyurethane rubber with the hardness H21 of 73A-81A; the diameter D21 of the tight packing material layer is 0.4 mm-1.1 mm;
further, the dimensional relationship between the diameter D21 of the tight packing material layer and the depth D3 and width T3 of the square groove is as follows: t3> D21> D3,0.8 x D21> D3>0.55 x D21; the depth D3 of the groove meets the design of 0.8D21 > D3> 0.55D21, so that the acoustic sensing optical fiber is incompletely wrapped by the groove, part of the acoustic sensing optical fiber can be exposed out of the groove to be in contact with the elastic sheath layer, the acoustic sensing optical fiber is further in close contact with the cable core layer and the elastic sheath layer, and the detection sensitivity of the towed acoustic sensing optical cable is increased.
Furthermore, the elastic glue is made of epoxy resin with the viscosity V5 of 1200 mPas-1300 mPas before curing, so that the fluidity of the glue is enhanced, and bubbles in the gaps of the grooves are eliminated.
Further, the elastic sheath layer is made of thermoplastic polyurethane rubber with the hardness of 73A-81A; the thickness T1 of the elastic sheath layer is 1.5 mm-3.5 mm.
After the technical scheme is adopted, the invention has the following beneficial effects:
(1) According to the drag type acoustic sensitive optical cable, the grooves are spirally formed in the outer peripheral surface of the cable core layer, and elastic glue with the Young modulus M5 of 0.56 Gpa-0.85 Gpa after solidification is adopted between the grooves and the acoustic sensing optical fibers for filling, so that the acoustic sensing optical fibers can be spirally fixed on the outer peripheral surface of the cable core layer, and the influence on the sensing precision of the drag type acoustic sensitive optical cable due to the change of the tight winding pitch caused by the movement of the positions of the acoustic sensing optical fibers is prevented; the elastic glue tightly contacts the acoustic sensing optical fiber and the cable core layer, so that loss and distortion of acoustic sensing signals between the acoustic sensing optical fiber and the cable core layer are reduced, acoustic sensing sensitivity is improved, young modulus M5 of the elastic glue after solidification is 0.56 Gpa-0.85 Gpa, elastic modulus of the acoustic sensing optical fiber is 0.5 Gpa-0.8 Gpa, elastic modulus of the cable core layer is 0.55 Gpa-0.95 Gpa, elastic modulus of the cable core layer, elastic glue and elastic modulus of the acoustic sensing optical fiber are matched, modulus gradient from large to small is formed sequentially, sound pressure sensitivity and transmission length are improved, and signal transmission effectiveness of acoustic sensing is further improved.
(2) The hardness H1 of the cable core layer is 75A-85A, so that the vibration resonance of sound waves in the cable core layer can be conducted, the transmission waveform of the sound waves is maintained, meanwhile, the transmission speed of the sound waves can be increased, the transmission distance is increased, the problems that the sensing optical fiber is not tightly contacted with the cable core and the sensing performance is reduced due to the fact that the cable core layer is too hard are avoided, and therefore better sound sensing characteristics can be achieved, and the fidelity and the transmission distance of sound sensing are enhanced.
(3) The diameter D4 of the cable core layer is 10-25 mm; the diameter of the cable core layer is smaller, the overall structural design of the light-weight dragging type acoustic sensitive optical cable can be realized, the volume and the weight of the overall optical cable are reduced, and the dragging and releasing convenience is improved.
(4) The numerical aperture NA of the high bending resistance low-loss optical fiber is 0.16-0.21, the diameter D22 of the outer coating layer is 0.165-0.245 mm, the diameter D22 of the glass cladding layer is 0.07-0.125 mm, the bending resistance of the flexible ultra-fine acoustic sensing optical fiber is enhanced, more acoustic sensing optical fibers can be wound at a smaller pitch, the sensitivity of the towed acoustic sensing optical fiber is improved, and the transmission distance of the towed acoustic sensing optical fiber is prolonged.
(5) The depth D3 of the groove meets the design of 0.8D 21> D3> 0.55D 21, so that the acoustic sensing optical fiber is incompletely wrapped by the groove, part of the acoustic sensing optical fiber can be exposed out of the groove to be contacted with the elastic sheath layer, the acoustic sensing optical fiber is further closely contacted with the cable core layer and the elastic sheath layer, and the detection sensitivity of the towed acoustic sensing optical cable is increased.
(6) The viscosity V5 of the elastic glue before curing is 1200 mPas-1300 mPas, the fluidity of the glue is enhanced, bubbles at the gaps of the grooves are eliminated, and the elastic glue, the acoustic sensing optical fiber and the cable core layer are closely contacted together, so that the acoustic sensing sensitivity is improved.
Drawings
FIG. 1 is a schematic view of an optical cable according to one embodiment of the present invention;
FIG. 2 is a schematic side view of an optical cable according to one embodiment of the present invention;
FIG. 3 is a schematic illustration of an acoustic sensing fiber positioned within a groove in accordance with one embodiment of the present invention;
the reference numerals are: the optical fiber cable comprises an elastic sheath layer 1, an acoustic sensing optical fiber 2, a tight packing material layer 21, a high bending resistance low loss optical fiber 22, a groove 3, a cable core layer 4 and elastic glue 5.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. 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 invention, as 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 made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present invention, it should be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on those shown in the drawings, or those conventionally put in place when the inventive product is used, or those conventionally understood by those skilled in the art, merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the embodiments of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Referring to fig. 1, the drag type acoustic sensitive optical cable of the embodiment comprises a cable core layer 4 and an elastic sheath layer 1 from inside to outside, wherein a groove 3 is spirally arranged on the peripheral surface of the cable core layer 4; an acoustic sensing optical fiber 2 is arranged in the groove 3; elastic glue 5 is filled between the groove 3 and the acoustic sensing optical fiber 2; the Young modulus M5 of the elastic glue 5 after curing is 0.56 Gpa-0.85 Gpa; the elastic modulus of the acoustic sensing optical fiber 2 is 0.5 Gpa-0.8 Gpa; the elastic modulus of the cable core layer 4 is 0.55 Gpa-0.95 Gpa. The grooves are spirally formed in the outer peripheral surface of the cable core layer 4, so that the tightly wound positions of the tightly wound acoustic sensing optical fibers on the outer peripheral surface of the cable core layer 4 can be fixed, the tightly wound acoustic sensing optical fibers are prevented from moving, the tightly wound pitch is changed, and the sensing precision is influenced; elastic glue 5 is filled between the groove 3 and the acoustic sensing optical fiber 2, so that the acoustic sensing optical fiber is in full close contact with the high-density elastomer columnar cable core layer, loss and distortion of acoustic sensing signals are reduced, and acoustic sensing sensitivity is improved; after the elastic glue 5 is solidified, the Young modulus M5 is 0.56 Gpa-0.85 Gpa, and is matched with the elastic modulus of the flexible ultra-fine acoustic sensing optical fiber and the high-density elastic body columnar cable core layer, so that the signal transmission effectiveness of acoustic sensing is enhanced.
The cable core layer 4 of the embodiment is made of a blend of polypropylene with the hardness H1 of 75A-85A and ethylene propylene diene monomer; the hardness H1 of the cable core layer 4 is 75A-85A, so that vibration resonance of sound waves in the cable core layer can be conducted, transmission waveforms of the sound waves are maintained, meanwhile, the transmission speed of the sound waves can be increased, the transmission distance is enhanced, the problem that the sensing optical fiber is not tightly contacted with the cable core due to the fact that the cable core layer is too hard, and the sensing performance is reduced is solved, and therefore excellent sound sensing characteristics can be achieved, and the fidelity and the transmission distance of sound sensing are enhanced.
The cable core layer 4 of the embodiment is of a solid cylinder structure; the diameter D4 of the cable core layer 4 is 10-25 mm; the diameter of the cable core layer 4 is smaller, the overall structural design of the light-weight dragging type acoustic sensitive optical cable can be realized, the volume and the weight of the overall optical cable are reduced, and the dragging and releasing convenience is improved.
The color of the cable core layer 4 of the embodiment adopts blue, and forms obvious color difference contrast with the acoustic sensing optical fiber 2, thereby being convenient for identification.
The groove 3 in this embodiment is a square groove; the depth D3 of the square groove is 0.5-1.2 mm, and the width T3 is 0.5-1.2 mm, wherein the size relation between the width T3 and the depth D3 is as follows: t3> D3; wherein the ratio of the length of the groove 3 to the length of the cable core layer is not more than 10:1.
The acoustic sensing optical fiber 2 of the embodiment comprises a high bending resistance low-loss optical fiber 22 and a tight packing material layer 21 from the inside to the outside;
the high bending resistance low loss optical fiber 22 of the present embodiment adopts a single mode fiber, and comprises a core layer, a glass cladding layer and an outer coating layer from inside to outside; the numerical aperture NA of the high bending resistance low loss optical fiber 22 is 0.16-0.21; the diameter D22 of the outer coating layer is 0.165-0.245 mm; the diameter D22 of the glass cladding is 0.07 mm-0.125 mm; the bending resistance of the flexible ultra-fine acoustic sensing optical fiber is enhanced, more acoustic sensing optical fibers 2 can be wound at a smaller pitch, the sensitivity of the towing type acoustic sensing optical cable is improved, and the transmission distance of the towing type acoustic sensing optical cable is increased.
The material of the tight packing material layer 21 of the present embodiment is thermoplastic polyurethane rubber with the hardness H21 of 73A to 81A; the diameter D21 of the tight packing material layer 21 is 0.4 mm-1.1 mm;
the dimensional relationship between the diameter D21 of the tight packing material layer 21 and the depth D3 and width T3 of the square groove in this embodiment is as follows: t3> D21> D3,0.8 x D21> D3>0.55 x D21; the depth D3 of the groove meets the design of 0.8D21 > D3> 0.55D21, so that the acoustic sensing optical fiber 2 is incompletely wrapped by the groove, part of the acoustic sensing optical fiber 2 can be exposed out of the groove to be in contact with the elastic sheath layer 1, the acoustic sensing optical fiber 2 is in close contact with the cable core layer and the elastic sheath layer 1, and the detection sensitivity of the towed acoustic sensing optical cable is improved.
The elastic glue 5 is made of epoxy resin; the viscosity V5 of the elastic glue 5 before solidification is 1200 mPas-1300 mPas, so that the fluidity of the glue is enhanced, and bubbles in the gaps of the grooves are eliminated.
The elastic sheath layer 1 is made of thermoplastic polyurethane rubber with polyurethane hard chain segments and polyester or polyether soft chain segments which are mutually combined in a blocking way, wherein the polyurethane hard chain segments react with isocyanate; the hardness of the elastic sheath layer 1 is 73A-81A; the thickness T1 of the elastic sheath layer 1 is 1.5 mm-3.5 mm; the color of the elastic sheath layer 1 adopts orange, so that the biting of sharks can be prevented in the sea.
The following Table one shows a part of design parameters of the drag-type acoustic-sensitive optical cables of examples 1 to 8 of the present invention
The following Table II shows another design parameter table II of the drag-type acoustic-sensitive optical cables of examples 1-8 of the present invention
The following Table III shows the performance parameters of the drag-type acoustic-sensitive cables of examples 1-8 of the present invention
From the first, second and third tables, it can be found that the transmission distance of the towed acoustic sensitive optical cables of examples 1 to 8 is longer, and the acoustic pressure sensitivity is better; comparison of comparative examples 1-3 with examples 4 and 5 shows that the epoxy resin with the Young's modulus M5 of 0.56 Gpa-0.85 Gpa after curing is adopted as the elastic glue, the elastic moduli of the cable core layer, the elastic glue and the acoustic sensing optical fiber can be matched, and the modulus gradient from large to small is formed in sequence, so that the transmission distance of the obtained drag type acoustic sensing optical cable is longer, and the acoustic pressure sensitivity is better; comparative examples 4 to 5 were compared with example 7, and it was found that the transmission distance of the obtained drag type acoustic sensitive optical cable was longer and the acoustic pressure sensitivity was better by using the cable core layer having a hardness H1 of 75A to 85A.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (8)
1. The drag type sound sensitive optical cable comprises a cable core layer (4) and an elastic sheath layer (1) from inside to outside, and is characterized in that a groove (3) is spirally arranged on the peripheral surface of the cable core layer (4); an acoustic sensing optical fiber (2) is arranged in the groove (3); elastic glue (5) is adopted to fill and fix the groove (3) and the acoustic sensing optical fiber (2); the Young modulus M5 of the elastic glue (5) after curing is 0.56 Gpa-0.85 Gpa; the elastic modulus of the acoustic sensing optical fiber (2) is 0.5 Gpa-0.8 Gpa; the elastic modulus of the cable core layer (4) is 0.55 Gpa-0.95 Gpa.
2. A towed acoustically sensitive optical cable according to claim 1, characterized in that said cable core layer (4) is of solid cylindrical structure; the diameter D4 of the cable core layer (4) is 10-25 mm.
3. A towed acoustically sensitive optical cable according to claim 1, characterized in that said core layer (4) has a hardness H4 of 75-85A.
4. A towed acoustically sensitive optical cable according to claim 1, characterized in that said grooves (3) are square grooves; the depth D3 of the square groove is 0.5-1.2 mm, the width T3 is 0.5-1.2 mm, and the dimensional relation between the width T3 and the depth D3 is as follows: t3> D3.
5. The towed acoustic sensitive optical cable according to claim 1, characterized in that said acoustic sensing fiber (2) comprises, from inside and outside, a high-bending-resistance low-loss fiber (22), a tight-wrapping material layer (21); the high bending resistance low loss optical fiber (22) is a single mode optical fiber; the numerical aperture NA of the high bending resistance low loss optical fiber (22) is 0.16-0.21; the high bend resistant low loss optical fiber (22) includes a glass cladding and an outer coating; the diameter D22 of the outer coating layer is 0.165-0.245 mm; the diameter D22 of the glass cladding is 0.07 mm-0.125 mm.
6. A towed acoustically sensitive optical cable according to claim 5, characterized in that said tight-wrapping material layer (21) has a diameter D21 of 0.4 mm-1.1 mm; the diameter D21 of the tight packing material layer (21) is related to the depth D3 and the width T3 of the square groove in the following size manner: t3> D21> D3,0.8 x D21> D3>0.55 x D21.
7. The towed acoustically sensitive optical cable of claim 5, wherein the pre-cure viscosity V5 of the elastomeric glue (5) is 1200 mPa-s to 1300 mPa-s.
8. A towed acoustically sensitive optical cable according to claim 1, characterized in that said elastic glue (5) is filled between the groove (3) and the acoustic sensing fiber (2) by means of an on-line glue brushing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310905744.7A CN116974022A (en) | 2023-07-24 | 2023-07-24 | Towed acoustic sensitive optical cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310905744.7A CN116974022A (en) | 2023-07-24 | 2023-07-24 | Towed acoustic sensitive optical cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116974022A true CN116974022A (en) | 2023-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310905744.7A Pending CN116974022A (en) | 2023-07-24 | 2023-07-24 | Towed acoustic sensitive optical cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116974022A (en) |
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2023
- 2023-07-24 CN CN202310905744.7A patent/CN116974022A/en active Pending
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