CN115657241B - Ribbon optical fiber sensing optical cable - Google Patents
Ribbon optical fiber sensing optical cable Download PDFInfo
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- CN115657241B CN115657241B CN202211432652.3A CN202211432652A CN115657241B CN 115657241 B CN115657241 B CN 115657241B CN 202211432652 A CN202211432652 A CN 202211432652A CN 115657241 B CN115657241 B CN 115657241B
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Abstract
The invention belongs to the technical field of communication optical cables, and provides a strip-shaped optical fiber sensing optical cable which comprises a central reinforcing member and an optical fiber unit layer outside the central reinforcing member, wherein the optical fiber unit layer comprises at least 1 flat strip-shaped optical fiber unit which is continuously and spirally wound around the central reinforcing member; compared with bare fiber winding, the optical fiber ribbon is additionally provided with the substrate, the filling unit and the curing resin on the upper side and the lower side, so that the mechanical strength is improved, the broken fibers in the winding process are reduced, meanwhile, the size is smaller under the condition of the same fiber containing quantity, no air gap exists because the optical fibers are filled with the resin, and the sensitivity of signal detection is improved; the bare fibers are distributed in the resin in a continuous sinusoidal manner, so that the length of the optical fiber in unit optical cable length is further improved, the detectable range is further widened, and the detection sensitivity is improved.
Description
Technical Field
The application relates to the technical field of communication optical cables, in particular to a ribbon optical fiber sensing optical cable.
Background
With the development of optical fiber technology, optical fibers are no longer limited to the function of communication media, and the optical fiber sensing technology is rapidly developed along with the development of the optical fiber communication technology, and is a novel sensing technology which takes light waves as carriers and optical fibers as media and senses and transmits external detected signals. In the future, an optical cable product based on distributed optical fiber sensing can be well connected to an optical communication network, has the characteristics of economy, flexibility, continuity, long distance, high precision and real-time monitoring, and can be widely applied to detection and security in the fields of power cables, petroleum pipelines, tunnel roadbeds, building bridges, structural health, geotechnical engineering, dam hydrology, ocean exploration and the like.
The existing sensing optical cable is used as a carrier of an optical fiber distributed sensing system, optical fibers in the optical cable are mostly directly placed in the actual application process, and when the optical fibers are directly placed, the length of a single sensing optical fiber distributed in the unit optical cable length is limited, so that the detection sensitivity is not high. In addition, influenced by the application scene, the sensing optical cable needs to have certain mechanical strength, such as tensile and lateral pressure resistance, so that the optical cable is prevented from being damaged in the laying process, and the test signal is prevented from being interrupted.
Disclosure of Invention
In view of this, an object of the present application is to provide a ribbon optical fiber sensing cable, which solves the problems in the background art.
The embodiment of the application provides a ribbon optical fiber sensing optical cable, which comprises a central reinforcing member and an optical fiber unit layer outside the central reinforcing member, wherein the central reinforcing member is an elastomer or a thermoplastic elastic material with metal or nonmetal elements nested inside, and the optical fiber unit layer comprises at least 1 flat ribbon optical fiber unit which is spirally wound around the central reinforcing member continuously; the flat ribbon optical fiber unit comprises a flat ribbon upper substrate, a flat ribbon lower substrate, a middle bare fiber, a filling unit and resin cured and filled between the upper substrate and the lower substrate; the resin bonds the upper substrate, the lower substrate, the bare optical fiber and the filling unit into a whole; the substrate is a polyimide film, and the resin is at least one of polyacrylic resin, epoxy resin and single-component silicon rubber; the filling units and the bare fibers are uniformly spaced in the flat ribbon-shaped optical fiber unit and are continuously distributed along the length direction of the optical fiber unit, and the bare fibers are continuously distributed in the flat ribbon shape of the optical fiber unit in a sine shape along the length direction of the optical fiber unit.
In some embodiments, the width of the optical fiber unit is not less than twice the minimum macrobend loss diameter of the optical fiber unit.
In some embodiments, the optical fiber unit includes two filling units on both sides and at least one bare optical fiber between the two filling units.
In some embodiments, the central strength member surface is provided with a continuous groove in which the optical fiber unit is received.
In some embodiments, an inner armor layer is further disposed between the central strength member and the fiber unit layers.
In some embodiments, a first wrapping tape and a first outer protective layer are sequentially wrapped outside the optical fiber unit layer from inside to outside, and a reinforcing element is arranged in the first outer protective layer, wherein the reinforcing element is a metal element or Fiber Reinforced Plastic (FRP).
In some embodiments, the optical fiber unit layer is further sequentially wrapped with a first wrapping tape, a first outer protective layer, an outer armor layer, a second wrapping tape and a second outer protective layer from inside to outside.
The beneficial effect that this application can reach.
The application provides a ribbon optical fiber sensing optical cable which comprises a central reinforcing part and an optical fiber unit layer outside the central reinforcing part, wherein the optical fiber unit layer comprises at least 1 flat ribbon optical fiber unit which is continuously and spirally wound around the central reinforcing part, and the optical fiber unit with a flat ribbon structure can be better attached to the surface of the central reinforcing element or an inner armor layer, so that the gap is reduced, and the sensitivity of a detection signal is improved; meanwhile, the flat ribbon-shaped optical fiber unit comprises a flat ribbon-shaped upper substrate, a flat ribbon-shaped lower substrate, a bare fiber and a filling unit in the middle, and resin cured and filled between the upper substrate and the lower substrate, and compared with bare fiber winding, the optical fiber ribbon is added with a substrate protection layer, the mechanical strength is improved, and fiber breakage in the winding process is reduced; a filling unit (for example, the filling unit is nylon, steel wire or fiber reinforced plastic) is also arranged in the optical fiber unit of the flat ribbon structure, so that the mechanical strength of the ribbon optical fiber is further enhanced, and the tensile and lateral pressure resistance of the optical cable is enhanced; meanwhile, compared with the structure of the tight-sleeved optical fiber and the loose-sleeved optical fiber, the optical fiber has smaller size under the same fiber containing quantity, and the optical fibers are filled with resin without air gaps, so that the sensitivity of signal detection is improved. In addition, the optical fiber ribbon can also comprise a plurality of bare fibers, the number of optical fiber cores is increased, and a test signal channel is improved by accommodating the plurality of bare fibers; in addition, the bare fibers are distributed in the resin in a continuous sinusoidal manner, so that the length of the optical fiber in unit optical cable length is further increased, the detectable range is further widened, and the detection sensitivity is improved.
On the other hand, in some embodiments of the present application, through the structural design that the sensing optical cable sequentially includes the central reinforcement, the inner armor layer, the optical fiber unit layer, the first wrapping band, and the first outer protective layer from inside to outside, the overall strength of the sensing optical cable is enhanced, and the bending resistance, the lateral pressure resistance, and the tensile strength are enhanced.
On the other hand, the sensing optical cable of anti side pressure in some embodiments of this application includes the center reinforcement from inside to outside in proper order, interior armor, the optic fibre unit layer, first around the band, first outer jacket, outer armor, the second is around the band, the structural design of the outer sheath of second, two-layer armor has been set up inside and outside, two-layer inside and outside around the band, two-layer inside and outside outer jacket, the holistic intensity of sensing optical cable has further been strengthened, and the bending resistance ability of sensing optical cable has been strengthened, anti side pressure performance, tensile strength, satisfy the demand that the optical cable laid.
In order to make the aforementioned objects, features and advantages of the present application more 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 application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic diagram showing a first configuration of a ribbon fiber sensing cable according to the present application;
FIG. 2 is a schematic diagram showing a spiral winding of a flat ribbon fiber unit of a ribbon fiber sensing cable according to the present application;
FIG. 3 is a schematic view of a first flat ribbon fiber unit of a ribbon fiber optic sensing cable according to the present application;
FIG. 4 is a schematic diagram of a second structure of a flat ribbon fiber unit of a ribbon fiber sensing cable according to the present application;
FIG. 5 is a schematic structural diagram of a ribbon fiber sensing cable according to the present application;
fig. 6 shows a schematic structural diagram three of a ribbon optical fiber sensing cable according to the present application.
Wherein: the cable comprises, by weight, 1-a central reinforcement, 2-an optical fiber unit layer, 3-a first wrapping tape, 4-a first outer protective layer, 5-a tearing rope, 6-a reinforcing element, 7-an optical fiber unit, 10-a bare optical fiber, 11-an upper side substrate, 12-resin, 13-an inner armor layer, 14-a filling unit, 15-an outer armor layer, 16-a second wrapping tape, 17-a second outer protective layer and 18-a lower side substrate.
Detailed Description
The terms "comprising," "including," or "containing" in the description and claims of this application and the accompanying drawings are synonymous with "including," "containing," or "characterized by," and are inclusive or open-ended and do not exclude additional unrecited elements or method steps. "comprising" is a term of art used in claim language and means that the recited elements are present but that other elements may be added and still form a structure or method within the scope of the recited claims.
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, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance. The term "about" in this application is meant to encompass minor variations (up to +/-10%) in the stated value.
The existing sensing optical cable is used as a carrier of an optical fiber distributed sensing system, optical fibers in the optical cable are mostly directly placed in the actual application process, and when the optical fibers are directly placed, the length of a single sensing optical fiber distributed in the unit optical cable length is limited, so that the detection sensitivity is not high. In addition, influenced by the application scene, the sensing optical cable needs to have certain mechanical strength, such as tensile and lateral pressure resistance, so that the optical cable is prevented from being damaged in the laying process, and the test signal is prevented from being interrupted.
Based on the above, the embodiment of the present invention provides a ribbon optical fiber sensing cable, which includes a central reinforcing member and an optical fiber unit layer outside the central reinforcing member, wherein the central reinforcing member is an elastomer or a thermoplastic elastomer material with metal or nonmetal elements nested inside, and the optical fiber unit layer includes at least 1 flat ribbon optical fiber unit which is continuously and spirally wound around the central reinforcing member; the flat ribbon optical fiber unit comprises a flat ribbon upper substrate, a flat ribbon lower substrate, a middle bare fiber, a filling unit and resin cured and filled between the upper substrate and the lower substrate; the substrate is a polyimide film, and the resin is at least one of polyacrylic resin, epoxy resin and single-component silicon rubber; the filling units and the bare fibers are uniformly spaced in the flat ribbon-shaped optical fiber unit and are continuously distributed along the length direction of the optical fiber unit, and the bare fibers are continuously distributed in a sine shape along the length direction of the optical fiber unit in the flat ribbon shape of the optical fiber unit.
The continuous spiral winding around central reinforcer of flat ribbon optical fiber unit in this application has following advantage: (1) the number of optical cable cores is increased conveniently, and a test signal channel is improved by accommodating a plurality of bare fibers; for example, in some embodiments, the flat ribbon fiber unit can include a plurality of bare optical fibers; (2) the flat belt-shaped structure can be better attached to the surface of the central reinforcing element, so that the gap is reduced, and the sensitivity of a detection signal is improved; (3) compared with bare fiber winding, the optical fiber ribbon is additionally provided with the protective layer, the upper and lower substrates and the middle resin layer, and the filling units are arranged, so that the mechanical strength is improved, and fiber breakage in the winding process is reduced; meanwhile, compared with the structure of the tight-sleeved optical fiber and the loose-sleeved optical fiber, the optical fiber has smaller size under the condition of the same fiber containing quantity, and the optical fibers are filled with resin without air gaps, so that the sensitivity of signal detection is improved; (4) the bare fibers are distributed in the resin in a continuous sinusoidal manner, so that the length of the optical fiber in unit optical cable length is further improved, the detectable range is further widened, and the detection sensitivity is improved.
According to some embodiments of the application, the structural design that the sensing optical cable sequentially comprises the central reinforcing part, the inner armor layer, the optical fiber unit layer, the first wrapping band and the first outer protective layer from inside to outside is adopted, so that the overall strength of the sensing optical cable is enhanced, and the bending resistance, the lateral pressure resistance and the tensile resistance are enhanced.
In some embodiments of this application, anti side pressure's multicore sensing optical cable includes central reinforcement, interior armor, optic fibre unit layer from inside to outside in proper order, and is first around the band, first outer jacket, outer armor, the second is around the band, the structural design of second outer jacket, set up inside and outside two-layer armor, inside and outside two-layer around the band, inside and outside two-layer outer jacket, the holistic intensity of sensing optical cable has further been strengthened to and the resistant bending property ability of sensing optical cable has been strengthened, anti side pressure performance, tensile strength.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
Example 1
In this embodiment 1, a ribbon optical fiber sensing cable is provided, as shown in fig. 1, and includes, from inside to outside, a central reinforcement 1, an optical fiber unit layer 2, a polyimide film (PI film) first wrapping tape 3, and a first outer protective layer 4 in sequence. The layer of optical fibre units 2 comprises at least 1 flat ribbon-shaped optical fibre unit 7 continuously helically wound around the central strength member 1, as shown in fig. 2, in the present embodiment the optical fibre unit 7 in the sensing cable is helically wound around the central strength member 1.
The PI film is a film insulating material and is formed by polycondensation, casting and imidization of pyromellitic dianhydride (PMDA) and diaminodiphenyl ether (ODA) in a strong polar solvent. Yellow and transparent, and the relative density is 1.39-1.45. The polyimide film has excellent high and low temperature resistance, electric insulation, adhesion, radiation resistance and medium resistance, can be used for a long time in the temperature range of-269-280 ℃, and can reach the high temperature of 400 ℃ in a short time.
The central reinforcement 1 is an elastomer, for example, a thermoplastic polyolefin elastomer (TPO), a thermoplastic polyester elastomer (TPEE), a thermoplastic vulcanizate (TPV), for example, one or a combination of a polyethylene elastomer, a polyolefin elastomer, a polypropylene elastomer, for example, a thermoplastic polyurethane elastomer rubber (TPU).
In other embodiments, central strength member 1 is a thermoplastic elastomer material with nested metallic or non-metallic elements inside, which can strengthen the cable without loss of measurement sensitivity. Thermoplastic elastomers such as thermoplastic polyolefin elastomer (TPO), thermoplastic polyester elastomer (TPEE), thermoplastic polyurethane elastomer rubber (TPU), or thermoplastic vulcanizate (TPV), among others. The metal element may be, for example, a steel wire. The non-metallic elements may be Fiber Reinforced Plastics (FRP), such as glass fiber reinforced plastic rods, aramid fiber reinforced plastic rods, carbon fiber reinforced plastic rods, and the like.
The first outer protective layer 4 can be made of thermoplastic elastic materials such as TPU, TPV, TPO, TPEE and the like, and the materials can be used as sound absorption materials, have better sound absorption effect and can improve the sensitivity of the optical cable to sound wave signal detection; meanwhile, the thermoplastic elastomer material can improve the flexibility and elasticity of the forming unit and ensure better oil resistance, water resistance, cold resistance and mildew resistance.
In other embodiments, such as in a more demanding application, such as an oil well, fluoroplastic may be used for first outer jacket 4 to improve the temperature rating of the cable.
The first outer protective layer 4 is provided with a reinforcing element 6, the reinforcing element 6 can be Fiber Reinforced Plastics (FRP), or can be a metal element, such as a phosphated steel wire, a galvanized steel strand or a copper-plated steel strand, and the like, and the bending resistance of the optical cable is further enhanced by the arrangement of the reinforcing element 6.
A tearing rope 5 is buried between the first outer protective layer 4 and the PI film, the tearing rope 5 is parallel to the axis of the optical cable, and at least one tearing rope 5 is arranged. In other embodiments there are at least two ripcords 5 and the at least two ripcords 5 are evenly distributed along the circumference of the cable. The setting of tearing the rope has made things convenient for opening of optical cable to shell, has made things convenient for the maintenance and the maintenance in optical cable laying back later stage.
The optical fiber unit 7 in the present embodiment has a ribbon shape, and as shown in fig. 3, includes an upper substrate 11 having a flat ribbon shape, a lower substrate 18 having a flat ribbon shape, a bare fiber 10 and a filling unit 14 in the middle, and a resin 12 filled between the upper and lower substrates. The substrate is divided into an upper layer and a lower layer, both are polyimide films, and the thickness is less than or equal to 0.15mm. Resin 12 is filled between the polyimide film substrates for fixing the optical fiber, and the upper and lower polyimide film substrates are bonded to form a whole. The resin is at least one of polyacrylic resin, epoxy resin and single-component silicon rubber.
In the present embodiment, the flat ribbon-shaped optical fiber unit further has a filler unit 14 therein, and as shown in fig. 3, the filler unit 14 is located in the resin between the substrates on both sides of the flat ribbon-shaped optical fiber unit, and is arranged in parallel with the bare fibers 10. The optical fiber unit includes two filling units 14 at both sides and at least one bare fiber 10 between the two filling units. The filling units 14 and the bare fibers 10 are uniformly spaced within the flat ribbon-shaped optical fiber unit and are continuously distributed along the length direction of the optical fiber unit. The filling unit 14 is nylon, steel wire or Fiber Reinforced Plastic (FRP). The addition of the filling units strengthens the tensile property of the flat ribbon optical fiber, reduces fiber breakage in the winding process, facilitates mechanical and automatic manufacture of the optical cable, and improves the overall tensile property of the sensing optical cable.
In some embodiments, the optical fiber unit 7 is a flat ribbon structure with a width W not less than twice the minimum macrobend loss diameter d of the optical fiber Minimum macrobend of optical fiber I.e. W.gtoreq.2 d Minimum macrobend of optical fiber (ii) a The thickness is more than 0.25 and less than or equal to 0.8mm. Wherein the minimum macrobend loss diameter d of the optical fiber unit Minimum macrobend of optical fiber The minimum diameter of the optical fiber unit is equal to or less than 0.02dB at 1550nm macrobending loss when the optical fiber unit is wound for 1 circle.
In some embodiments, the number of the bare fibers 10 is more than or equal to 1 core, and the bare fibers 10 are continuously distributed along the length direction of the optical fiber unit 7 at uniform intervals in the flat ribbon shape.
In some embodiments, the bare fibers 10 are distributed between the polyimide films in a continuous sinusoidal distribution along the length direction of the optical fiber unit, as shown in FIG. 4, and the number of bare optical cores is ≧ 1 core. The continuous sinusoidal distribution of the bare fiber in the resin further improves the fiber length in unit optical cable length, further widens the detectable range and improves the detection sensitivity.
The filling units may be distributed in a continuous sinusoidal manner along the length direction of the optical fiber unit within the resin between the substrates on both sides of the flat ribbon-shaped optical fiber unit, as shown in fig. 4. In other embodiments, the filling units may be linearly distributed on both sides of the bare fiber along the length direction of the optical fiber unit within the resin between the substrates on both sides of the flat ribbon-shaped optical fiber unit.
The optical fiber unit in this embodiment is in the form of an optical fiber ribbon. The n optical fibers in the optical fiber ribbon may be distributed continuously along the length direction of the optical fiber ribbon at uniform intervals, and the bare fibers 10 are distributed in a continuous sinusoidal manner along the length direction of the optical fiber unit in the flat ribbon shape of the optical fiber unit, as shown in fig. 4.
The optical fiber unit 7 in this embodiment is spirally wound around the central strength member 1 at a constant pitch. In other embodiments, the optical fiber unit can be densely wound with variable pitch, and the dense winding ratio of the optical fiber unit is in the detection regionThe optical cable with different optical fiber tight winding ratios can be laid according to different detection scenes, the sensing optical cable resource with limited length is utilized to the maximum extent, and the optical cable sensitivity of the detected position is improved. If different detected points are distributed on a continuous detection path at intervals, the optical cable position corresponding to a larger close winding ratio can be ensured to be just positioned at a required detection point position by changing the close winding pitch and the close winding number of the optical fiber units in the optical cable, and other detection points are not required, and the arrangement of the optical fiber units can be realized by reducing the close winding ratio. Optical fiber close-winding ratio K = optical fiber length/optical cable length = L in the present application Optical fiber /L Optical cable (in this application the length of the unwound optical fiber is not counted at L Optical cable Inner, i.e. only calculating the fiber length and cable length from the 1 st to the nth turn).
In some embodiments, the central strength member surface may have a helical groove running along its length, the width and depth of the helical groove being sized to accommodate and ensure compactness with respect to the length and width of the cross-section of the optical fiber unit. The flat ribbon-shaped optical fiber unit 7 is filled in the spiral groove and continuously spirally wound around the circumference of the central reinforcing part 1, so that compared with the case that the optical fiber unit is directly spirally wound on the surface of the central reinforcing part, the gap between the central reinforcing part and the protective layer is reduced, the resistance of air in the gap to sound waves is reduced, and the sensitivity of sound wave signal detection is improved.
In the sensing optical cable in the embodiment, the optical fiber units in the optical cable are spirally wound and distributed, so that the stable transmission performance of the optical cable is ensured, the optical fiber length in unit optical cable length is increased, the detectable range is further widened, and the detection sensitivity is improved; meanwhile, the central reinforcing part is made of a sensitization material, so that the external transmission energy loss can be reduced, and the detection sensitivity of the sensing optical cable is improved. The outer sheath and the reinforcing element therein protect the optical cable, so that the overall strength and bending resistance of the sensing optical cable are enhanced. The PI film has the characteristics of excellent high and low temperature resistance, electric insulation, adhesion, radiation resistance, medium resistance and the like, and also plays a certain role in protecting the optical fiber unit.
In this embodiment, the design of the optical fiber unit 7 structure of the ribbon optical fiber sensing cable is newly proposed, and the following advantages are also provided:
(1) the number of optical cable cores is increased, and a test signal channel is improved by accommodating a plurality of bare fibers;
(2) the flat belt-shaped structure can be better attached to the surface of the central reinforcing element, so that the gap is reduced, and the sensitivity of a detection signal is improved;
(3) compared with bare fiber winding, the optical fiber ribbon is additionally provided with the protective layer, the substrate, the filling element and the coated resin layer on the upper side and the lower side are added, the mechanical strength is improved, and fiber breakage in the winding process is reduced; meanwhile, compared with the structure of the tight-sleeved optical fiber and the loose-sleeved optical fiber, the optical fiber has smaller size under the condition of the same fiber containing quantity, and the optical fibers are filled with resin without air gaps, so that the sensitivity of signal detection is improved.
(4) The bare fibers are distributed in the resin in a continuous sinusoidal manner, so that the length of the optical fiber in unit optical cable length is further improved, the detectable range is further widened, and the detection sensitivity is improved.
Example 2
Another optical fiber ribbon sensing cable is provided in this embodiment 2, and the main difference between the optical cable in embodiment 2 and the optical cable in embodiment 1 is the structural design of the optical cable, especially the design of the armored reinforcing structure. As shown in fig. 5, the optical fiber cable comprises a central reinforcing member 1, an inner armor layer 13, an optical fiber unit layer 2, a first wrapping tape 3 and a first outer protective layer 4 from inside to outside in sequence. The flat ribbon optical fiber unit 7 is continuously spirally wound around the inner sheath 13 outside the inner sheath 13.
The central reinforcement 1 is an elastomer, for example, a thermoplastic polyolefin elastomer (TPO), a thermoplastic polyester elastomer (TPEE), a thermoplastic vulcanizate (TPV), for example, one or a combination of a polyethylene elastomer, a polyolefin elastomer, a polypropylene elastomer, for example, a thermoplastic polyurethane elastomer rubber (TPU). In other embodiments, the central stiffener 1 is a thermoplastic elastomer with nested metallic or non-metallic elements inside. Thermoplastic elastomers such as thermoplastic polyolefin elastomer (TPO), thermoplastic polyester elastomer (TPEE), thermoplastic polyurethane elastomer rubber (TPU), or thermoplastic vulcanizate (TPV), among others. The metal element may be, for example, a steel wire. The non-metallic elements may be Fiber Reinforced Plastics (FRP), such as glass fiber reinforced plastic rods, aramid fiber reinforced plastic rods, carbon fiber reinforced plastic rods, and the like.
The first outer protective layer 4 can be made of thermoplastic elastic materials such as TPU, TPV, TPO, TPEE and the like, and the materials can be used as sound absorption materials, have better sound absorption effect and can improve the sensitivity of the optical cable to sound wave signal detection; meanwhile, the thermoplastic elastomer material can improve the flexibility and elasticity of the forming unit and ensure better oil resistance, water resistance, cold resistance and mildew resistance. In other embodiments, such as for use in a more demanding environment, such as an oil well, fluoroplastic may be used for first outer jacket 4 to improve the temperature resistance of the cable.
The central stiffener 1 has an inner armour layer 13 around it. The inner armor layer 13 may be steel wire or Fiber Reinforced Plastic (FRP), such as a glass fiber reinforced plastic rod, an aramid fiber reinforced plastic rod, a carbon fiber reinforced plastic rod, or the like.
First 3 can be polyimide film (PI membrane), non-woven fabrics, the cloth that blocks water, polyester tape (wheat draw area), polypropylene around band, non-woven fabrics around band, polyvinyl chloride around band, polytetrafluoroethylene area (PTFE), glass fiber cloth, mica tape etc.. First playing buffering and liner effect around band 3, can protecting inside optic fibre unit layer 2, according to the selection of different materials, play different effects such as waterproof, thermal-insulated, anticorrosive or anti-aging respectively simultaneously.
The first outer protective layer 4 is provided with a reinforcing element 6, the reinforcing element 6 can be Fiber Reinforced Plastics (FRP), or can be a metal element, such as a phosphatized steel wire, a galvanized steel strand, or a copper-plated steel strand, and the like, and the bending resistance of the optical cable is further enhanced by the arrangement of the reinforcing element 6.
A tearing rope 5 is buried between the first outer protective layer 4 and the first wrapping tape 3, the tearing rope 5 is parallel to the axis of the optical cable, and the tearing rope 5 is at least provided with one. In other embodiments there are at least two ripcords 5 and the at least two ripcords 5 are evenly distributed along the circumference of the cable. The arrangement of the tearing rope facilitates the stripping of the optical cable, and the later maintenance and repair of the laid optical cable are facilitated.
The rest is described in example 1, and the description is not repeated here.
In this embodiment, the structural design that the sensing optical cable sequentially includes the central reinforcement 1, the inner armor layer 13, the optical fiber unit layer 2, the first wrapping tape 3 and the first outer protective layer 4 from inside to outside enhances the overall strength of the sensing optical cable, enhances the bending resistance, the lateral pressure resistance and the tensile strength, and can even meet the laying requirements under severe conditions.
Example 3
In the present embodiment 3, a lateral pressure resistant sensing optical cable is provided, and as shown in fig. 6, the main difference of the embodiment 3 from the optical cable in the above embodiment 1 lies in the structural design of the optical cable, particularly the design of the reinforcing member and the protective layer.
As shown in fig. 6, the optical fiber cable comprises a central reinforcing member 1, an inner armor layer 13, an optical fiber unit layer 2, a first wrapping tape 3, a first outer protective layer 4, an outer armor layer 15, a second wrapping tape 16 and a second outer protective layer 17 from inside to outside in sequence.
The central reinforcement 1 is an elastomer, for example, a thermoplastic polyolefin elastomer (TPO), a thermoplastic polyester elastomer (TPEE), a thermoplastic vulcanizate (TPV), for example, one or a combination of a polyethylene elastomer, a polyolefin elastomer, a polypropylene elastomer, for example, a thermoplastic polyurethane elastomer rubber (TPU). In other embodiments, the central stiffener 1 is a thermoplastic elastomer with metallic or non-metallic elements nested inside. Thermoplastic elastomers such as thermoplastic polyolefin elastomer (TPO), thermoplastic polyester elastomer (TPEE), thermoplastic polyurethane elastomer rubber (TPU), or thermoplastic vulcanizate (TPV), among others. The metal element may be, for example, a steel wire. The non-metallic elements may be Fiber Reinforced Plastics (FRP), such as glass fiber reinforced plastic rods, aramid fiber reinforced plastic rods, carbon fiber reinforced plastic rods, and the like.
The central stiffener 1 has an inner armour layer 13 around it. An outer armor layer 15 is arranged outside the first outer protective layer 4. The inner armor layer 13 and the outer armor layer 15 may be steel wires or Fiber Reinforced Plastics (FRP), such as glass fiber reinforced plastic rods, aramid fiber reinforced plastic rods, carbon fiber reinforced plastic rods, and the like. The double-layer armor layer increases the tensile and lateral pressure resistance of the sensing optical cable, so that the sensing optical cable is more suitable for being buried and laid.
The first outer protective layer 4 and the second outer protective layer 17 can be made of thermoplastic elastic materials, such as TPU, TPV, TPO, TPEE and the like, and the materials can be used as sound absorption materials, have a good sound absorption effect and can improve the sensitivity of the optical cable to sound wave signal detection; meanwhile, the thermoplastic elastomer material can improve the flexibility and elasticity of the forming unit and ensure better oil resistance, water resistance, cold resistance and mildew resistance. In other embodiments, such as in a more demanding application, such as an oil well, fluoroplastic may be used for first outer jacket 4 or second outer jacket 17 to improve the temperature resistance of the cable.
First can be for polyimide film (PI membrane), non-woven fabrics, water blocking cloth, polyester area (Mylar area), polypropylene around band 3 and second around band 16, non-woven fabrics around band, polyvinyl chloride around band, polytetrafluoroethylene area (PTFE), glass fiber cloth, mica tape and so on. First around band 3 and second around band 16 play buffering and liner effect, first can also protect inside optic fibre unit layer 2 around band 3, simultaneously according to the selection of different materials, play different effects such as waterproof, thermal-insulated, anticorrosive or anti-aging respectively.
The optical fiber unit layer adopts at least 1 flat ribbon optical fiber unit 7 to be continuously and spirally densely wound along the inner armor layer 13.
The rest is described in example 1, and the description is not repeated here.
In this embodiment, a side pressure resistant ribbon fiber sensing optical cable, from inside to outside include central reinforcement 1 in proper order, interior armor 13, optical fiber unit layer 2, first around band 3, first outer jacket 4, outer armor 15, the second is around band 16, the structural design of second outer jacket 17, two-layer armor inside and outside having set up, two-layer inside and outside around the band, two-layer inside and outside outer jacket, the holistic intensity of sensing optical cable has further been strengthened, and the bending resistance ability of sensing optical cable has been strengthened, side pressure resistant performance, tensile strength, satisfy the demand that the optical cable laid the construction.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (6)
1. A ribbon fiber sensing cable, comprising a central strength member and a fiber unit layer outside the central strength member, wherein the central strength member is an elastomer or a thermoplastic elastomer with a metal or nonmetal element nested inside, and the fiber unit layer comprises at least 1 flat ribbon fiber unit which is continuously and spirally wound around the central strength member; the width of the optical fiber unit is not less than twice the minimum macrobend loss diameter of the optical fiber unit;
the optical fiber unit comprises a flat banded upper substrate, a flat banded lower substrate, a bare fiber and a filling unit between the upper substrate and the lower substrate, and resin solidified and filled between the upper substrate and the lower substrate, wherein the upper substrate, the lower substrate, the bare fiber and the filling unit are bonded into a whole by the resin; the substrate is a polyimide film, and the resin is at least one of polyacrylic resin, epoxy resin and single-component silicon rubber; the filling unit and the bare fibers are continuously distributed in the optical fiber unit along the length direction of the optical fiber unit, and the bare fibers are continuously distributed in a sine shape in the flat ribbon shape of the optical fiber unit along the length direction of the optical fiber unit.
2. The ribbon fiber sensing optical cable of claim 1, wherein the optical fiber unit includes two filling units on both sides and at least one bare fiber between the two filling units.
3. A ribbon fiber sensing cable according to claim 1, wherein said central strength member surface is provided with a continuous groove, and said optical fiber unit is received in said continuous groove.
4. A ribbon fiber sensing cable according to any one of claims 1-2, wherein an inner armor layer is further disposed between the central strength member and the fiber unit layers.
5. The ribbon fiber sensing optical cable according to any one of claims 1 to 3, wherein a first wrapping tape and a first outer sheath are sequentially wrapped outside the optical fiber unit layer from inside to outside, and a reinforcing element is disposed in the first outer sheath, and the reinforcing element is a metal element or Fiber Reinforced Plastic (FRP).
6. The ribbon fiber sensing optical cable according to any one of claims 1 to 3, wherein the optical fiber unit layer is further covered with a first wrapping tape, a first outer sheath, an outer armor layer, a second wrapping tape, and a second outer sheath from inside to outside in sequence.
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| CN202211432652.3A CN115657241B (en) | 2022-11-16 | 2022-11-16 | Ribbon optical fiber sensing optical cable |
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| CN202211432652.3A CN115657241B (en) | 2022-11-16 | 2022-11-16 | Ribbon optical fiber sensing optical cable |
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| CN115657241B true CN115657241B (en) | 2023-03-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09101210A (en) * | 1995-10-03 | 1997-04-15 | Ishikawajima Harima Heavy Ind Co Ltd | Optical fiber sensor for temperature measurement |
| DE19738651A1 (en) * | 1997-09-04 | 1999-03-11 | Alsthom Cge Alcatel | Device for determining the temperature of an object and method for producing such a device |
| JP4706475B2 (en) * | 2005-12-28 | 2011-06-22 | 日立電線株式会社 | Measuring method using optical sensor |
| CN105093450B (en) * | 2015-07-21 | 2018-10-12 | 江苏通光海洋光电科技有限公司 | A kind of intelligent submarine optical fiber cable being embedded in sensing element in cable core insulating layer |
| WO2021232026A1 (en) * | 2020-05-14 | 2021-11-18 | Ctc Global Corporation | Composite strength members for overhead electrical cables and methods for interrogation of same |
| CN112504306A (en) * | 2020-10-30 | 2021-03-16 | 电子科技大学 | Close-wound optical fiber type hypersensitive oil well sensing optical cable |
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