A lightweight coaxial variable-diameter deep-sea optical fiber hydrophone array

Abstract

The invention belongs to the technical field of light sensing detection systems, and discloses a light coaxial variable-diameter deep-sea optical fiber hydrophone array, comprising an optical cable component and an optical fiber hydrophone array element, wherein a first connecting optical fiber of an optical fiber twisted layer in the optical cable component is twisted outside a central tensile layer, a plurality of armored sheath layers are sequentially and spacedly sleeved on the outer side of the optical fiber twisted layer to form a neutral position, a sound-transmitting sheath component is sleeved on the neutral position, a hydrophone probe component is connected to the first connecting optical fiber in the sound-transmitting sheath component, a sealing skeleton component is end-to-end docked with the hydrophone probe component in the sound-transmitting sheath component, and a clamping space for the optical fiber twisted layer to pass through and a sealed cabin space for accommodating optical devices of the hydrophone probe component are formed, the first connecting optical fiber can extend into the sealed cabin space to be connected to a sensing optical fiber of the hydrophone probe component, which plays a role in reducing the bending radius, reducing the outer diameter and reducing the weight, and is conducive to the rapid and convenient deployment of the array in the deep sea.

Description

Technical Field

[0001] The invention belongs to the technical field of light sensing detection systems, and in particular relates to a light coaxial variable-diameter deep-sea optical fiber hydrophone array. Background Art

[0002] Fiber optic hydrophone is an underwater acoustic signal sensor based on optical fiber and optoelectronic technology. It converts underwater acoustic vibration into optical signals through highly sensitive optical coherence detection, and transmits the optical fiber to the signal processing system to extract the acoustic signal information. It has the characteristics of high sensitivity and good frequency response characteristics, and because it uses optical fiber as an information carrier, it is suitable for long-distance and large-scale monitoring.

[0003] At present, fiber optic hydrophone arrays are becoming a research hotspot, especially in deep-sea applications. Deep-sea fiber optic hydrophone arrays need to meet both deep-sea environmental use requirements and fiber optic hydrophone array sensing and detection requirements. However, existing deep-sea fiber optic hydrophone arrays usually follow the shallow-sea fiber optic hydrophone array structure, and only improve the pressure-resistant sealing performance on this basis. Specifically, multiple fiber optic hydrophones are connected by optical fibers and encapsulated through an outer sheath to form a cable-like structure with the same outer diameter. In order to meet the array's lateral pressure resistance performance, an armor layer, load-bearing steel wire or Kevlar rope, various support frames and filling glue are provided in the outer sheath. Due to the presence of a large number of support frames and filling glue, the array has a large outer diameter, heavy weight and a large bending radius, which makes it difficult to achieve fast and convenient deployment in the deep sea, and also causes high costs and poor economic benefits. Summary of the invention

[0004] In view of the above defects or shortcomings, the present invention provides a lightweight coaxial variable diameter deep-sea fiber optic hydrophone array, aiming to solve the technical problems of existing deep-sea fiber optic hydrophone arrays, such as large array outer diameter, heavy weight and large bending radius.

[0005] To achieve the above-mentioned purpose, the present invention provides a lightweight coaxial variable-diameter deep-sea optical fiber hydrophone array, wherein the lightweight coaxial variable-diameter deep-sea optical fiber hydrophone array comprises an optical cable component and an optical fiber hydrophone array element, the optical cable component comprises a central tensile layer, an optical fiber twisted layer and an armored jacket layer, the optical fiber twisted layer comprises at least two first connecting optical fibers, the at least two first connecting optical fibers are twisted on the outside of the central tensile layer and extend along the length direction of the central tensile layer, the number of armored jacket layers is multiple, the multiple armored jacket layers are sleeved on the outside of the optical fiber twisted layer and are sequentially spaced along the length direction of the optical fiber twisted layer, so that a vacant position where the optical fiber twisted layer is exposed is formed between two adjacent armored jacket layers; and an optical fiber hydrophone array element is correspondingly arranged at each vacant position The optical fiber hydrophone array element includes a sound-transmitting sheath component, a hydrophone probe component and a sealing frame component. The sound-transmitting sheath component is sleeved on the outer side of the optical fiber twisted layer in a neutral position. The two ends of the sound-transmitting sheath component are respectively sealed and connected with the corresponding armored sheath layers. The hydrophone probe component is placed in the sound-transmitting sheath component and connected with the first connecting optical fiber. The sealing frame component is placed in the sound-transmitting sheath component and docked with the end side of the hydrophone probe component. The sealing frame component can be assembled to form a clamping space for the optical fiber twisted layer to pass through. The surrounding side of the sealing frame component also forms a sealable sealed cabin space. The optical device of the hydrophone probe component is placed in the sealed cabin space. The first connecting optical fiber can extend into the sealed cabin space to be connected with the sensing optical fiber of the hydrophone probe component.

[0006] In the embodiment of the present invention, the sealing frame assembly is provided with a first cabin penetration sealing nozzle through which the sensing optical fiber of the hydrophone probe assembly can extend into the sealed cabin space.

[0007] In an embodiment of the present invention, there are two first connecting optical fibers that are disconnected in the neutral position of the optical fiber twisted layer, and two second cabin penetration sealing nozzles are provided at both ends of the sealing skeleton assembly. The two second cabin penetration sealing nozzles can allow the two disconnected first connecting optical fibers to extend into the sealed cabin space one by one and be connected to the sensing optical fiber respectively.

[0008] In the embodiment of the present invention, a probe protection cover is also provided on the outer side of the sound-transparent sheath assembly corresponding to the hydrophone probe assembly.

[0009] In the embodiment of the present invention, the two ends of the sound-transparent sheath assembly are respectively sealed and connected with the corresponding armored sheath layer through an injection-molded connecting layer. The sound-transparent sheath assembly includes a sound-transparent sheath body and two plugging cores. The sound-transparent sheath body is sleeved on the outer side of the optical fiber twisted layer in a neutral position. The two plugging cores are respectively arranged at the two ends of the sound-transparent sheath body and are oppositely spliced. The large end of the plugging core is expanded and stretched into the sound-transparent sheath body, and the small end of the plugging core can be clamped on the outer side of the optical fiber twisted layer. The injection-molded connecting layer is sequentially injected on the outer side of the armored sheath layer and the plugging core.

[0010] In the embodiment of the present invention, a glue injection hole is formed on the peripheral wall of the plugging core, one end of the glue injection hole is opened on the outer peripheral side of the plugging core, and the other end is opened on the end side extending into the sound-permeable sheath body.

[0011] In an embodiment of the present invention, the injection-molded connecting layer includes an inclined section and a straight section which are arranged in sequence, the inclined section extends from the armored sheath layer toward the plugging core, and the outer ring diameter of the inclined section is gradually expanded in the extension direction, and the straight section is arranged on the outside of the plugging core and extends to abut against the end side of the sound-transparent sheath body.

[0012] In an embodiment of the present invention, a crimping sheath assembly is further provided on the outer side of the injection molded connection layer, and the crimping sheath assembly includes a crimping sheath body and two end crimping rings. The crimping sheath body is sleeved on the outer side of the injection molded connection layer, and both ends of the crimping sheath body extend out of the injection molded connection layer and are respectively and one-to-one sleeved on the armor sheath layer and the sound-transparent sheath body, and the two end crimping rings are respectively and one-to-one crimped on the outer sides of the two ends of the crimping sheath body.

[0013] In an embodiment of the present invention, the fiber optic hydrophone array element further comprises a support frame, which is disposed in the sound-transparent sheath assembly and is formed with support vias, through which the fiber twisted layer can pass and provide support to the fiber twisted layer.

[0014] In an embodiment of the present invention, the optical fiber twisted layer also includes a second connecting optical fiber, the second connecting optical fiber and at least two first connecting optical fibers are twisted on the outside of the central tensile layer and extend along the length direction of the central tensile layer, and the first connecting optical fiber is used to connect at least two hydrophone probe assemblies in the subarray, each subarray is arranged corresponding to a different first connecting optical fiber, and the second connecting optical fiber is used to connect to the first connecting optical fiber between subarrays.

[0015] In an embodiment of the present invention, the optical fiber twisted layer further includes twisted metal wires, and the twisted metal wires, the second connecting optical fibers and at least two first connecting optical fibers are twisted outside the central tensile layer and extend along the length direction of the central tensile layer.

[0016] In an embodiment of the present invention, the central tensile layer includes a central tensile metal wire and at least two peripheral tensile metal wires, and the at least two peripheral tensile metal wires are twisted outside the central tensile metal wire and extend along the length direction of the central tensile metal wire.

[0017] In the embodiment of the present invention, the armored sheath layer includes an optical cable outer sheath and an inner armor layer, and the inner armor layer is placed between the optical fiber twisted layer and the optical cable outer sheath.

[0018] Through the above technical solution, the lightweight coaxial variable diameter deep-sea optical fiber hydrophone array provided by the present invention has the following beneficial effects:

[0019] When the above-mentioned lightweight coaxial variable-diameter deep-sea fiber-optic hydrophone array is used, since it includes an optical cable component and an optical fiber hydrophone array element, at least two first connecting optical fibers of the optical fiber twisted layer of the optical cable component are twisted on the outside of the central tensile layer and extended along the length direction of the central tensile layer, and multiple armor sheath layers are sequentially and spacedly sleeved on the outside of the optical fiber twisted layer along the length of the optical fiber twisted layer, so that a gap position where the optical fiber twisted layer is exposed is formed between two adjacent armor sheath layers, the optical fiber hydrophone array element is arranged corresponding to the gap position, and the sound-transparent sheath assembly of the optical fiber hydrophone array element is sleeved on the outside of the optical fiber twisted layer at the gap position, the hydrophone probe assembly is placed in the sound-transparent sheath assembly and connected to the first connecting optical fiber, the sealing skeleton assembly is placed in the sound-transparent sheath assembly and docked with the end side of the hydrophone probe assembly, and the sealing skeleton assembly can be spliced ​​and clamped on the optical fiber twisted layer and on the circumferential side. A sealable cabin space is formed, the optical device of the hydrophone probe assembly is placed in the sealed cabin space, and the first connecting optical fiber can extend into the sealed cabin space to be connected with the sensing optical fiber of the hydrophone probe assembly. Compared with the optical fiber hydrophone array in the prior art which only uses optical fiber for connection, the deep-sea optical fiber hydrophone array provided in the present invention connects all the optical fiber hydrophone array elements in series through an optical cable member with a central tensile layer, which plays a tensile role and can effectively reduce the bending radius of the array. At the same time, due to the existence of the optical cable member, it is not necessary to set a supporting skeleton and filling glue on the entire length of the array like the optical fiber hydrophone array structure in the prior art, so that the outer diameter size and weight can be reduced, which is conducive to the rapid and convenient deployment of the array in the deep sea, is convenient for construction, and the cost is further reduced, and it is easy to form an array quickly and on a large scale, with good economic benefits. In addition, the addition of a sealed skeleton assembly can, on the one hand, provide support for the optical fiber twisted layer by clamping it, and, by docking with the hydrophone probe assembly, can stably install the hydrophone probe assembly on the optical cable component; on the other hand, it can also protect the optical devices in the hydrophone probe assembly from the influence of deep-sea high pressure through the sealed cabin space, thus having higher reliability.

[0020] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative work. In the accompanying drawings:

[0022] Figure 1 is a schematic structural diagram of a lightweight coaxial variable-diameter deep-sea optical fiber hydrophone array according to an embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of an optical cable component according to an embodiment of the present invention;

[0024] Figure 3 is a schematic structural diagram of an optical fiber hydrophone array element in a neutral position according to an embodiment of the present invention;

[0025] Figure 4 is a schematic structural diagram of a hydrophone probe assembly and a sealing frame assembly from a cross-sectional perspective according to an embodiment of the present invention;

[0026] Figure 5 is a structural schematic diagram of another cross-sectional view of a hydrophone probe assembly and a sealing skeleton assembly according to an embodiment of the present invention;

[0027] Figure 6 is a schematic cross-sectional structural diagram of a plug core, an injection-molded connecting layer and a crimping sheath assembly according to an embodiment of the present invention;

[0028] Figure 7 2 is a schematic diagram of the structure of a probe protection cover according to an embodiment of the present invention.

[0029] Description of reference numerals:

[0030] 100, optical cable component; 110, central tensile layer; 111, central tensile metal wire; 112, peripheral tensile metal wire; 113, tensile strand matrix; 120, optical fiber strand layer; 121, first connecting optical fiber; 122, second connecting optical fiber; 123, stranded metal wire; 124, optical unit sheath body; 130, armored sheath layer; 131, optical cable outer sheath; 132, inner armor layer; 200, optical fiber hydrophone array element; 210, sound-transparent sheath assembly; 211, sound-transparent sheath body; 212, plugging core; 213, glue injection hole; 220, hydrophone probe assembly; 221, probe sensor mounting tube; 230, injection molding connection layer; 231, inclined section; 232, straight section; 240, sealing skeleton assembly; 241, skeleton clamping body; 242, sealing cover plate; 243, clamping space; 244, sealed cabin space; 245, first cabin sealing nozzle; 246, second cabin sealing nozzle; 250, probe protection cover; 260, buckling sleeve assembly; 261, buckling sleeve body; 262, end buckling ring; 263, middle buckling ring; 270, supporting skeleton. DETAILED DESCRIPTION

[0031] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0032] The lightweight coaxial variable-diameter deep-sea optical fiber hydrophone array of the present invention will be described below with reference to the accompanying drawings.

[0033] like Figures 1 to 3 As shown, the present invention provides a lightweight coaxial variable diameter deep-sea optical fiber hydrophone array, wherein the lightweight coaxial variable diameter deep-sea optical fiber hydrophone array comprises:

[0034] The optical cable component 100 includes a central tensile layer 110, an optical fiber twisted layer 120 and an armored jacket layer 130. The optical fiber twisted layer 120 includes at least two first connecting optical fibers 121. The at least two first connecting optical fibers 121 are twisted outside the central tensile layer 110 and extend along the length direction of the central tensile layer 110. There are multiple armored jacket layers 130. The multiple armored jacket layers 130 are sleeved on the outside of the optical fiber twisted layer 120 and are sequentially spaced along the length direction of the optical fiber twisted layer 120, so that a gap position where the optical fiber twisted layer 120 is exposed is formed between two adjacent armored jacket layers 130.

[0035] The optical fiber hydrophone array element 200 is correspondingly arranged at each neutral position. The optical fiber hydrophone array element 200 includes a sound-transmitting sheath component 210 and a hydrophone probe component 220. The sound-transmitting sheath component 210 is sleeved on the outer side of the optical fiber twisted layer 120 at the neutral position. The two ends of the sound-transmitting sheath component 210 are respectively sealed and connected to the corresponding armored sheath layer 130. The hydrophone probe component 220 is placed in the sound-transmitting sheath component 210 and connected to the first connecting optical fiber 121.

[0036] When the above-mentioned lightweight coaxial variable-diameter deep-sea optical fiber hydrophone array is used, since it includes an optical cable component 100 and an optical fiber hydrophone array element 200, at least two first connecting optical fibers 121 of the optical fiber twisted layer 120 of the optical cable component 100 are twisted on the outside of the central tensile layer 110 and extend along the length direction of the central tensile layer 110, and a plurality of armored jacket layers 130 are sequentially and spacedly sleeved on the outside of the optical fiber twisted layer 120 along the length of the optical fiber twisted layer 120, so that a neutral position where the optical fiber twisted layer 120 is exposed is formed between two adjacent armored jacket layers 130, and the optical fiber hydrophone array element 200 is arranged corresponding to the neutral position, and the sound-transparent jacket component 210 of the optical fiber hydrophone array element 200 is sleeved on the outside of the optical fiber twisted layer 120 at the neutral position, and the two ends of the sound-transparent jacket component 210 are respectively connected to the correspondingly arranged armored jacket layers 130. 0 is sealed and connected, the hydrophone probe assembly 220 is placed in the sound-transparent sheath assembly 210 and connected to the first connecting optical fiber 121. Compared with the optical fiber hydrophone array in the prior art that only uses optical fibers for connection, the deep-sea optical fiber hydrophone array provided in the present invention connects all the optical fiber hydrophone array elements 200 in series through the optical cable member 100 with the central tensile layer 110, which plays a tensile role, thereby effectively reducing the bending radius of the array. At the same time, due to the existence of the optical cable member 100, it is not necessary to set a supporting skeleton 270 and a filling glue on the entire length of the array like the optical fiber hydrophone array structure in the prior art, thereby reducing the outer diameter and reducing the weight, which is conducive to the rapid and convenient deployment of the array in the deep sea, is convenient for construction, and the cost is further reduced, and it is easy to quickly and large-scale array, with good economic benefits.

[0037] Specifically, the optical cable assembly 100 may be manufactured by first providing an armored jacket layer 130 over the entire length of the optical fiber twisted layer 120, and then sequentially stripping off multiple sections of the armored jacket layer 130 at intervals to expose the optical fiber twisted layer 120; of course, the present invention is not limited thereto, and multiple armored jacket layers 130 may also be directly provided sequentially at intervals over the entire length of the optical fiber twisted layer 120. In addition, in order to connect the first connecting optical fiber 121 in the optical fiber twisted layer 120 with the hydrophone probe assembly 220, it is necessary to cut off the first connecting optical fiber 121 at the idle position to connect the hydrophone probe assembly 220.

[0038] See also Figures 3 to 5In the embodiment of the present invention, the optical fiber hydrophone array element 200 further includes a sealing skeleton assembly 240 disposed in the sound-transparent sheath assembly 210 and docked with the end side of the hydrophone probe assembly 220. The sealing skeleton assembly 240 can be assembled to form a clamping space 243 for the optical fiber twisted layer 120 to pass through. A sealable sealed cabin space 244 is also formed on the peripheral side of the sealing skeleton assembly 240. A first cabin penetration sealing nozzle 245 is provided on the sealing skeleton assembly 240 for allowing the sensing optical fiber of the hydrophone probe assembly 220 to extend into the sealed cabin space 244. The optical devices (e.g., Faraday rotator, optical fiber coupler) of the hydrophone probe assembly 220 are all disposed in the sealed cabin space 244, and the first connecting optical fiber 121 can extend into the sealed cabin space 244 to be connected with the sensing optical fiber of the hydrophone probe assembly 220. The addition of the sealing skeleton assembly 240, on the one hand, can support the splicing and clamping of the optical fiber twisted layer 120 through the clamping space 243, and stably install the hydrophone probe assembly 220 on the optical cable assembly 100; on the other hand, the optical devices in the hydrophone probe assembly 220 can be protected from the influence of deep-sea high pressure through the sealing cabin space 244, and have higher reliability.

[0039] Specifically, the hydrophone probe assembly 220 has a probe sensor mounting tube 221 that is docked with the sealing skeleton assembly 240. The sensing optical fiber of the hydrophone probe assembly 220 is wound on the probe sensor mounting tube 221 and extends from the first cabin sealing nozzle 245 into the sealed cabin space 244. The radial dimension of the inner cavity space of the probe sensor mounting tube 221 is greater than the outer diameter dimension of the armored jacket layer 130 of the optical cable component 100. During assembly, the inner cavity space of the probe sensor mounting tube 221 can allow the optical cable component 100 to pass through, so that the hydrophone probe assembly 220 is placed in a neutral position. At the same time, the sealing skeleton assembly 240 includes a sealing cover plate 242 and two skeleton clamping bodies 241. The two skeleton clamping bodies 241 are placed on both sides of the optical fiber twisted layer 120 and clamp and splice the optical fiber twisted layer 120. The spliced ​​ends of the two skeleton clamping bodies 241 extend into the inner cavity space of the probe sensor mounting tube 221 for docking. A sealed cabin space 244 can be opened on one of the skeleton clamping bodies 241. The sealing cover plate 242 is used to cover the sealed cabin space 244 and can be detachably arranged on the corresponding skeleton clamping body 241.

[0040] In the embodiment of the present invention, there are two first connection optical fibers 121 in the optical fiber twisting layer 120 in the neutral position, and both ends of the sealing skeleton assembly 240 are provided with two second cabin penetration sealing nozzles 246, and the two second cabin penetration sealing nozzles 246 can be used for the two disconnected first connection optical fibers 121 to extend into the sealed cabin space 244 one by one to connect with the sensing optical fiber respectively. Selecting two first connection optical fibers 121 to be disconnected and connecting the sensing optical fiber between the two first connection optical fibers 121 will make each first connection optical fiber 121 have only one connection position with the sensing optical fiber, which obviously makes the connection length more sufficient and the processing more convenient compared to the scheme of connecting the sensing optical fiber to a single first connection optical fiber 121 with two connection positions. In addition, the first connection optical fiber 121 is extended into the sealed cabin space 244 to connect with the sensing optical fiber, so that the connection point can be located in the sealed cabin space 244, and the connection point is not affected by the high pressure of the deep sea.

[0041] Specifically, the first connecting optical fiber 121 and the sensing optical fiber can be connected by fusion splicing, that is, the connection point between the two is the fusion splicing point. At the same time, the two first connecting optical fibers 121 can be disconnected in the middle section of the sealing skeleton assembly 240, and one end of the first connecting optical fiber 121 close to the hydrophone probe assembly 220 is stripped from the optical fiber twisting layer 120, and is extended from the corresponding second cabin penetration sealing nozzle 246 into the sealed cabin space 244 to connect with the sensing optical fiber, and the other end of the first connecting optical fiber 121 away from the hydrophone probe assembly 220 is stripped from the optical fiber twisting layer 120, and is extended from the corresponding second cabin penetration sealing nozzle 246 into the sealed cabin space 244 to connect with the sensing optical fiber.

[0042] It should be particularly noted that, within a sub-array, the sensing optical fibers of all the hydrophone probe assemblies 220 in the sub-array can be connected via the two first connecting optical fibers 121 .

[0043] See also Figures 3 to 5 ,as well as Figure 7 In the embodiment of the present invention, the outer side of the sound-transmitting sheath assembly 210 is also covered with a probe protection cover 250 corresponding to the hydrophone probe assembly 220. The addition of the probe protection cover 250 can improve the performance of the array in resisting lateral pressure. Specifically, the probe protection cover 250 extends from the hydrophone probe assembly 220 to an end of the sealing frame assembly 240 away from the hydrophone probe assembly 220, and the probe protection cover 250 can be made of titanium alloy material.

[0044] See also Figure 3 and Figure 6In the embodiment of the present invention, the two ends of the sound-transmitting sheath assembly 210 are respectively sealed and connected with the corresponding armored sheath layer 130 through the injection-molded connecting layer 230. The sound-transmitting sheath assembly 210 includes a sound-transmitting sheath body 211 and two plugging cores 212. The sound-transmitting sheath body 211 is sleeved on the outside of the optical fiber twisted layer 120 in a neutral position. The two plugging cores 212 are respectively arranged at the two ends of the sound-transmitting sheath body 211 and are both arranged opposite to each other. The large end of the plugging core 212 is sealed and fitly extended into the sound-transmitting sheath body 211, and the small end of the plugging core 212 can be clamped on the outside of the optical fiber twisted layer 120. The injection-molded connecting layer 230 is sequentially injected on the outside of the armored sheath layer 130 and the plugging core 212. Furthermore, the sound-transmitting sheath body 211 is made of polyether polyurethane material to play a role in sound-transmitting sealing, and the addition of the plug 212 can seal the end of the sound-transmitting sheath assembly 210 and the optical fiber twisted layer 120 before injection molding, so as to enhance the connection strength and facilitate subsequent injection molding. Furthermore, the injection molding connection layer 230 can be formed by injection molding using vulcanized rubber to vulcanize and seal the gap between the armored sheath layer 130 and the plug 212.

[0045] In the embodiment of the present invention, a glue injection hole 213 is formed on the peripheral wall of the plug core 212, and one end opening of the glue injection hole 213 is arranged on the peripheral side of the plug core 212, and the other end opening is arranged on the end side extending into the sound-permeable sheath body 211. By opening the glue injection hole 213 on the plug core 212, it is convenient to inject the filling glue into the sound-permeable sheath body 211. Specifically, the glue injection hole 213 is L-shaped and includes a vertical section extending radially from the opening on the peripheral side of the plug core 212 and a transverse section extending axially from the end side. It can be understood that the glue injection operation can be performed before the injection molding connection layer 230 is formed, so that the opening on the peripheral side can be sealed by the injection molding connection layer 230 later.

[0046] In the embodiment of the present invention, the injection molding connection layer 230 includes an inclined section 231 and a straight section 232 which are arranged in sequence, the inclined section 231 extends from the armor jacket layer 130 toward the plug core 212, and the outer diameter of the inclined section 231 is gradually expanded in the extension direction, and the straight section 232 is arranged outside the plug core 212 and extends to abut against the end side of the sound-transmitting jacket body 211. That is, by setting the inclined section 231, the injection molding connection layer 230 can have a gradually expanded diameter-changing section, so as to facilitate the sound-transmitting jacket body 211 with an outer diameter larger than that of the armor jacket layer 130 to be connected to the armor jacket layer 130 as a whole.

[0047] In an embodiment of the present invention, a crimping sleeve assembly 260 is further provided on the outer side of the injection molding connection layer 230. The crimping sleeve assembly 260 includes a crimping sleeve body 261 and two end crimping rings 262. The crimping sleeve body 261 is sleeved on the outer side of the injection molding connection layer 230, and both ends of the crimping sleeve body 261 extend out of the injection molding connection layer 230 and are respectively and one-to-one sleeved on the armored sleeve layer 130 and the sound-transparent sleeve body 211. The two end crimping rings 262 are respectively and one-to-one crimped on the outer sides of the two ends of the crimping sleeve body 261. By adding the buckle sheath assembly 260, the injection molding connection layer 230 can be protected to enhance the sealing connection performance of the injection molding connection layer 230, and the two ends of the buckle sheath body 261 extend to the armored sheath layer 130 and the sound-transmitting sheath body 211, and the end buckle rings 262 are respectively provided at both ends to buckle and press the buckle sheath body 261, which can further ensure the sealing performance. In addition, the buckle sheath assembly 260 also includes a middle buckle ring 263, which is used to buckle the straight section 232 of the injection molding connection layer 230 on the plug 212.

[0048] Please see again Figure 3 In the embodiment of the present invention, the optical fiber hydrophone array element 200 further includes a support frame 270, which is disposed in the sound-transparent sheath assembly 210 and is formed with a support via hole, and the support via hole allows the optical fiber twisted layer 120 to pass through and provide support to the optical fiber twisted layer 120. The addition of the support frame 270 can provide structural support for the optical cable assembly 100 in the sound-transparent sheath assembly 210, thereby ensuring the overall stability and durability of the optical fiber hydrophone array. Specifically, the number of the support frames 270 is at least two, and at least two support frames 270 are disposed on both sides of the hydrophone probe assembly 220 and the sealing frame assembly 240.

[0049] See also Figure 2In the embodiment of the present invention, the optical fiber twisting layer 120 further includes a second connecting optical fiber 122. The second connecting optical fiber 122 and at least two first connecting optical fibers 121 are twisted outside the central tensile layer 110 and extend along the length direction of the central tensile layer 110. The first connecting optical fiber 121 is used to connect at least two hydrophone probe assemblies 220 in the subarray. Different subarrays are provided corresponding to different second connecting optical fibers 122. The second connecting optical fiber 122 is used to connect with the first connecting optical fiber 121 between subarrays. It can be understood that the optical fiber hydrophone array provided by the present invention includes a plurality of subarrays, each of which has at least two optical fiber hydrophone array elements 200. The hydrophone probe assemblies 220 in all the optical fiber hydrophone array elements 200 in each subarray are connected through the first connecting optical fiber 121. Different subarrays can be connected using different first connecting optical fibers 121. Then, the second connecting optical fiber 122 is used to connect the first connecting optical fibers 121 of the plurality of subarrays.

[0050] In the embodiment of the present invention, the optical fiber twisted layer 120 further includes a twisted metal wire 123, and the twisted metal wire 123, the second connecting optical fiber 122 and at least two first connecting optical fibers 121 are twisted outside the central tensile layer 110 and extend along the length direction of the central tensile layer 110. The twisted metal wire 123 is added to the optical fiber twisted layer 120, which can not only play the role of twisted filling, but also play the role of improving the lateral pressure resistance performance. Further, the twisted metal wire 123 includes but is not limited to galvanized steel wire, and the optical fiber twisted layer 120 also includes an optical unit sheath body 124, which is formed by injection molding after the twisted metal wire 123, the second connecting optical fiber 122 and the first connecting optical fiber 121 are twisted, so that the twisted metal wire 123, the second connecting optical fiber 122 and the first connecting optical fiber 121 can be buried in the optical unit sheath body 124. Of course, in the neutral position, the optical unit sheath body 124 can be destroyed to expose the first connecting optical fiber 121, or the optical unit sheath body 124 is not provided in the neutral position, and the optical unit sheath body 124 can be made of TPU (thermoplastic polyurethane elastomer) material to improve the overall lateral pressure resistance and sealing performance. Further, the number of the first connecting optical fiber 121 can be five, the number of the second connecting optical fiber 122 can be two, the number of the twisted metal wires 123 can be seven, and two adjacent twisted metal wires 123 are arranged with one connecting optical fiber spaced apart.

[0051] Please see again Figure 2In the embodiment of the present invention, the central tensile layer 110 includes a central tensile metal wire 111 and at least two peripheral tensile metal wires 112, and the at least two peripheral tensile metal wires 112 are twisted outside the central tensile metal wire 111 and extend along the length direction of the central tensile metal wire 111. The central tensile metal wire 111 plays a main tensile role at the central position, and the peripheral tensile metal wires 112 play a role in improving the lateral pressure resistance performance. The central tensile layer 110 is continuous and uninterrupted in the array to ensure reliable tensile performance. Specifically, the central tensile metal wire 111 and the peripheral tensile metal wire 112 include but are not limited to high-strength galvanized steel strands, the number of the peripheral tensile metal wires 112 can be 6, and the central tensile layer 110 also includes a tensile strand matrix 113, which is formed by injection molding after at least two peripheral tensile metal wires 112 are twisted, so that the central tensile metal wire 111 and the peripheral tensile metal wire 112 are both buried in the tensile strand matrix 113.

[0052] In the embodiment of the present invention, the armored sheath layer 130 includes an optical cable outer sheath 131 and an inner armor layer 132, and the inner armor layer 132 is disposed between the optical fiber twisted layer 120 and the optical cable outer sheath 131. The inner armor layer 132 uses steel belt longitudinally wrapped welded corrugated armor, and the optical cable outer sheath 131 uses HDPE (high-density polyethylene) material to meet the sealing requirements of long-term deep-sea work.

[0053] Therefore, the present invention provides a light coaxial variable diameter deep-sea fiber optic hydrophone array, which uses a layer-twisted optical cable component to connect the fiber optic hydrophone array elements in series to form a deep-sea fiber optic hydrophone array. Specifically, the optical cable component can be peeled off to form the idle position required for the array element installation, and the individual fiber optic hydrophone array elements are packaged to form a variable outer diameter fiber optic hydrophone array, the diameter of the array element position is slightly larger, and the optical cable component between the two adjacent array elements is slightly smaller in diameter. Compared with the conventional deep-sea fiber optic hydrophone array, the deep-sea fiber optic hydrophone array of this structure has a smaller overall outer diameter, lighter weight, and a smaller bending radius, which is conducive to the rapid and convenient deployment of the deep-sea array and is easy to construct. In addition, this array eliminates a certain number of structures such as skeletons, sheaths, sound-permeable glue, load-bearing ropes, and external armored steel wires between the conventional array elements. The array is light, low-cost, simple to produce, and has a short production cycle. It is easy to quickly and large-scale arrays and has good economic benefits.

[0054] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0057] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A lightweight coaxial variable diameter deep-sea optical fiber hydrophone array, characterized in that: include: An optical cable component (100) comprises a central tensile layer (110), an optical fiber twisted layer (120) and a plurality of armored jacket layers (130), wherein the optical fiber twisted layer (120) comprises at least two first connecting optical fibers (121), wherein the at least two first connecting optical fibers (121) are twisted outside the central tensile layer (110) and extend along the length direction of the central tensile layer (110), and the plurality of armored jacket layers (130) are sleeved outside the optical fiber twisted layer (120) and are sequentially spaced along the length direction of the optical fiber twisted layer (120), so that a neutral position where the optical fiber twisted layer (120) is exposed is formed between two adjacently arranged armored jacket layers (130), and the first connecting optical fibers (121) in the optical fiber twisted layer (120) are disconnected at the neutral position; A fiber optic hydrophone array element (200), wherein each of the neutral positions is provided with the fiber optic hydrophone array element (200), the fiber optic hydrophone array element (200) comprising a sound-transmitting sheath assembly (210), a hydrophone probe assembly (220) and a sealing skeleton assembly (240), wherein the sound-transmitting sheath assembly (210) is sleeved on the outer side of the optical fiber twisted layer (120) at the neutral position, and the two ends of the sound-transmitting sheath assembly (210) are respectively sealed and connected to the correspondingly provided armored sheath layer (130), and the hydrophone probe assembly (220) is placed in the sound-transmitting sheath assembly (210) and connected to the first connecting optical fiber (121). The sealing skeleton component (240) is placed in the sound-transparent sheath component (210) and docked with the end of the hydrophone probe component (220); the sealing skeleton component (240) can be assembled to form a clamping space (243) for the optical fiber twisted layer (120) to pass through; the sealing skeleton component (240) is also formed with a sealable sealed cabin space (244) on the circumference; the optical device of the hydrophone probe component (220) is placed in the sealed cabin space (244); the first connecting optical fiber (121) can extend into the sealed cabin space (244) to be connected with the sensing optical fiber of the hydrophone probe component (220).

2. The lightweight coaxial variable diameter deep-sea optical fiber hydrophone array according to claim 1 is characterized in that: The sealing frame assembly (240) is provided with a first cabin penetration sealing nozzle (245) for allowing the sensing optical fiber of the hydrophone probe assembly (220) to extend into the sealed cabin space (244).

3. The lightweight coaxial variable diameter deep-sea optical fiber hydrophone array according to claim 2 is characterized in that: The optical fiber twisted layer (120) has two first connecting optical fibers (121) that are disconnected in the neutral position, and two second cabin penetration sealing nozzles (246) are respectively and correspondingly arranged at the two ends of the sealing skeleton assembly (240), and the two second cabin penetration sealing nozzles (246) can allow the two disconnected first connecting optical fibers (121) to extend into the sealed cabin space (244) one by one and be connected to the sensing optical fiber respectively.

4. The lightweight coaxial variable diameter deep-sea optical fiber hydrophone array according to claim 1, characterized in that: The outer side of the sound-transmissive sheath component (210) is also provided with a probe protection cover (250) corresponding to the hydrophone probe component (220).

5. The lightweight coaxial variable diameter deep-sea optical fiber hydrophone array according to claim 1, characterized in that: The two ends of the sound-transmitting sheath component (210) are respectively sealed and connected to the corresponding armored sheath layer (130) through an injection-molded connection layer (230). The sound-transmitting sheath component (210) comprises a sound-transmitting sheath body (211) and two plugging cores (212). The sound-transmitting sheath body (211) is sleeved on the outer side of the optical fiber twisted layer (120) at the neutral position. The two plugging cores (212) are respectively arranged at the two ends of the sound-transmitting sheath body (211) and are arranged opposite to each other. The large ends of the plugging cores (212) are sealed and fit into the sound-transmitting sheath body (211), and the small ends of the plugging cores (212) can be clamped on the outer side of the optical fiber twisted layer (120). The injection-molded connection layer (230) is sequentially injection-molded on the outer sides of the armored sheath layer (130) and the plugging cores (212).

6. The lightweight coaxial variable diameter deep-sea optical fiber hydrophone array according to claim 5, characterized in that: A glue injection hole (213) is formed on the peripheral wall of the plugging core (212), one end of the glue injection hole (213) is opened on the outer peripheral side of the plugging core (212), and the other end is opened on the end side extending into the sound-transmitting sheath body (211); And / or, the injection-molded connecting layer (230) comprises an inclined section (231) and a straight section (232) which are arranged in sequence, the inclined section (231) extends from the armored jacket layer (130) toward the plugging core (212), and the outer ring diameter of the inclined section (231) is gradually expanded in the extension direction, and the straight section (232) is arranged on the outside of the plugging core (212) and extends to abut against the end side of the sound-transparent jacket body (211).

7. The lightweight coaxial variable diameter deep-sea optical fiber hydrophone array according to claim 5, characterized in that: A buckling sheath assembly (260) is also provided on the outer side of the injection molding connection layer (230), and the buckling sheath assembly (260) comprises a buckling sheath body (261) and two end buckling rings (262). The buckling sheath body (261) is sleeved on the outer side of the injection molding connection layer (230), and both ends of the buckling sheath body (261) extend out of the injection molding connection layer (230) and are respectively sleeved on the armored sheath layer (130) and the sound-transmitting sheath body (211) in a one-to-one correspondence, and the two end buckling rings (262) are respectively buckled on the outer sides of the two ends of the buckling sheath body (261) in a one-to-one correspondence.

8. The lightweight coaxial variable diameter deep-sea optical fiber hydrophone array according to any one of claims 1 to 7, characterized in that: At least two of the optical fiber hydrophone array elements (200) form a subarray, the number of the subarrays is multiple, the optical fiber twisted layer (120) further includes a second connecting optical fiber (122), the second connecting optical fiber (122) and at least two of the first connecting optical fibers (121) are twisted outside the central tensile layer (110) and extend along the length direction of the central tensile layer (110), and the first connecting optical fiber (121) is used to connect at least two of the hydrophone probe assemblies (220) in the subarray, each of the subarrays is arranged corresponding to a different first connecting optical fiber (121), and the second connecting optical fiber (122) is used to connect the first connecting optical fibers (121) arranged corresponding to different subarrays between subarrays.

9. The lightweight coaxial variable diameter deep-sea optical fiber hydrophone array according to claim 8, characterized in that: The optical fiber twisted layer (120) also includes a twisted metal wire (123), and the twisted metal wire (123), the second connecting optical fiber (122) and at least two of the first connecting optical fibers (121) are twisted on the outside of the central tensile layer (110) and extend along the length direction of the central tensile layer (110).

10. The lightweight coaxial variable diameter deep-sea optical fiber hydrophone array according to any one of claims 1 to 7, characterized in that: The central tensile layer (110) comprises a central tensile metal wire (111) and at least two peripheral tensile metal wires (112), wherein the at least two peripheral tensile metal wires (112) are twisted outside the central tensile metal wire (111) and extend along the length direction of the central tensile metal wire (111); And / or, the armored jacket layer (130) comprises an optical cable outer jacket (131) and an inner armor layer (132), and the inner armor layer (132) is disposed between the optical fiber twisted layer (120) and the optical cable outer jacket (131).

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