Solid shore-based optical fiber hydrophone array section structure and optical fiber hydrophone array assembly

Abstract

The invention relates to the related technical field of optical fiber hydrophones, and provides a solid-state shore-based optical fiber hydrophone array section structure and an optical fiber hydrophone array assembly.The array section structure comprises an array section body and two connector units, and the array section body comprises a transmission optical cable, an optical fiber hydrophone node section and a supporting section; the two connector units are located at the two opposite ends of the array section body respectively, each connector unit at least comprises a watertight connector, and the watertight connectors are connected with a transmission optical cable; wherein the array section main body is provided with an armored protective layer, and the armored protective layer is used for wrapping the transmission optical cable, the optical fiber hydrophone node section, the supporting section and the watertight connector. The watertight connectors are arranged at the two ends of the array section main body, so that the watertight performance of the array section structure is improved; the armored protective layer is arranged outside the array segment main body, so that the lateral pressure resistance of the optical fiber hydrophone node segment of the array segment structure is ensured, the protective capability and the mechanical strength of the array segment structure are enhanced, and it is ensured that signals received by the optical fiber hydrophone node segment in all directions are kept consistent.

Description

Technical Field

[0001] The present invention relates to the technical field related to optical fiber hydrophones, and in particular to a solid-state shore-based optical fiber hydrophone array segment structure and an optical fiber hydrophone array component. Background Art

[0002] Fiber optic hydrophone is an underwater acoustic signal sensor based on optical fiber and optoelectronic technology. It converts water acoustic vibration into optical signal through high-sensitivity optical coherence detection, and transmits it to the signal processing system through optical fiber to extract the acoustic signal information. It has the characteristics of high sensitivity and good frequency response characteristics. It uses optical fiber as an information carrier and is suitable for long-distance and large-scale detection. Fiber optic hydrophone is mainly used in the study of acoustic ship characteristics, noise, reverberation, seabed acoustic characteristics, target acoustic characteristics, etc. in the marine acoustic environment. It is an advanced detection method for modern naval anti-submarine warfare, underwater weapon testing, marine oil exploration and marine geological surveys.

[0003] In the solid-state shore-based fiber-optic hydrophone array of the related technology, the fiber-optic hydrophone signal is connected and transmitted through a transmission optical cable. However, due to the limited length margin of the optical cable inside the array and the lack of reliable protection, the extrusion and twisting during the packaging and recovery and deployment process can easily lead to fiber breakage of the optical cable, thereby causing signal loss of a large area of ​​fiber-optic hydrophone array elements and poor reliability.

[0004] In addition, the transmission optical cable is compatible with the load-bearing unit and the signal transmission unit. The fiber-optic hydrophone array element and the transmission optical cable are plugged in at the side to achieve signal transmission through the main cable. However, due to the structural influence of the transmission main cable, it is difficult to ensure that the signals received by the fiber-optic hydrophone array element in all directions remain consistent, which has an adverse effect on signal processing. At the same time, the outer diameter of the side plug-in position is larger than that of other positions. During the recovery and deployment process, the squeezing and torsion of the side plug-in position increase the difficulty of construction, and the reliability is average. Therefore, a highly reliable, large-aperture, long-distance transmission, and easy-to-assemble array method is an issue that needs to be urgently addressed in the current engineering process. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a solid shore-based optical fiber hydrophone array segment structure, which is highly reliable, can complete large-aperture long-distance transmission, and is easy to assemble.

[0006] The present invention provides a solid-state shore-based optical fiber hydrophone array segment structure, comprising: An array segment body, the array segment body comprising a transmission optical cable, an optical fiber hydrophone node segment and a support segment, the optical fiber hydrophone node segment and the support segment are both arranged on the transmission optical cable along the length direction of the transmission optical cable, and the transmission optical cable is connected to the optical fiber hydrophone node segment signal for transmission; Two connector units, the two connector units are respectively located at two opposite ends of the array segment body, the connector units at least include a watertight connector, and the watertight connector is connected to the transmission optical cable; Among them, an armored protective layer is provided on the array segment body, and the armored protective layer is used to cover the transmission optical cable, the optical fiber hydrophone node segment, the supporting segment and the watertight connector.

[0007] According to a solid-state shore-based optical fiber hydrophone array segment structure provided by the present invention, the joint unit further comprises an armored joint box, a part of the structure of the armored joint box is connected to the transmission optical cable, and another part of the structure is connected to the armored protective layer; Wherein, the opposite ends of two adjacent array segment bodies are correspondingly connected through the armored joint boxes arranged thereon.

[0008] According to a solid-state shore-based optical fiber hydrophone array segment structure provided by the present invention, the armored joint box comprises: An armored connector installed on the transmission optical cable; A bending limiter, a part of the structure of the bending limiter is connected to the armor joint, and another part is connected to the armor protective layer.

[0009] According to a solid-state shore-based optical fiber hydrophone array segment structure provided by the present invention, the array segment body comprises: A fiber optic hydrophone array element, which is installed on the transmission optical cable and connected to the transmission optical cable signal for transmission; A plurality of lateral pressure resistant support frames, wherein the plurality of lateral pressure resistant support frames are installed on the transmission optical cable along the length direction of the transmission optical cable; A plurality of glue-filling joints, wherein the plurality of glue-filling joints are installed on the transmission optical cable along the length direction of the transmission optical cable, and the glue-filling joints are provided with glue-filling ends for glue-filling; An outer sheath, the outer sheath is disposed on the transmission optical cable, the optical fiber hydrophone array element, the plurality of lateral pressure-resistant support frames and the partial structure of the plurality of glue-potting joints, the outer sheath is arranged to avoid the glue-potting end, and the glue-potting end is connected to the interior of the outer sheath, so as to form a potting glue layer inside the outer sheath; Wherein, a second buckling ring for locking the outer sheath and each of the glue potting joints is provided at the corresponding positions of the two, and part of the lateral pressure-resistant support skeleton, part of the glue potting joint, part of the outer sheath and part of the potting glue layer cooperate to form the support section; at least the fiber optic hydrophone array element, another part of the lateral pressure-resistant support skeleton, another part of the glue potting joint, another part of the outer sheath, another part of the potting glue layer and another part of the second buckling ring cooperate to form the fiber optic hydrophone node section.

[0010] According to a solid-state shore-based optical fiber hydrophone array segment structure provided by the present invention, the optical fiber hydrophone array element comprises: A fiber optic hydrophone component, the fiber optic hydrophone component is installed on the transmission optical cable, and the fiber optic hydrophone component is connected to the transmission optical cable signal for transmission; A storage bin is used to store optical components. The storage bin is installed on the transmission optical cable. The optical components in the storage bin are connected to the optical fiber hydrophone component to form a multiplexed optical link.

[0011] According to a solid-state shore-based optical fiber hydrophone array segment structure provided by the present invention, the transmission optical cable comprises: Central load-bearing unit; A plurality of pre-branching optical signal units, wherein the plurality of pre-branching optical signal units are arranged around the central load-bearing unit; A protective sleeve unit is coated on the outside of the plurality of pre-branching optical signal units.

[0012] According to a solid-state shore-based optical fiber hydrophone array segment structure provided by the present invention, a first buffer layer is provided between the central load-bearing unit and the pre-branching optical signal unit.

[0013] According to a solid-state shore-based optical fiber hydrophone array segment structure provided by the present invention, a reinforcing member and a water-blocking adhesive layer are provided between two adjacent pre-branching optical signal units.

[0014] According to a solid-state shore-based fiber optic hydrophone array segment structure provided by the present invention, the protective sleeve unit includes a PET isolation tape layer, a second buffer layer, a corrugated armor layer and a protective jacket layer, and the PET isolation tape layer, the second buffer layer, the corrugated armor layer and the protective jacket layer are sequentially arranged in a direction from close to to away from the pre-branching optical signal unit.

[0015] The present invention also provides a fiber optic hydrophone array assembly, comprising a plurality of the above-mentioned solid-state shore-based fiber optic hydrophone array segment structures, wherein the plurality of array segment bodies are sequentially connected via the connector unit.

[0016] The solid-state shore-based optical fiber hydrophone array segment structure provided by the present invention improves the watertight performance of the array segment structure by providing watertight connectors at both ends of the array segment body; in addition, an armored protective layer is provided on the outside of the array segment body to ensure the side pressure tolerance performance of the optical fiber hydrophone node segment of the array segment structure, and enhance the protection capability and mechanical strength of the array segment structure, which is conducive to ensuring that the signals received by the optical fiber hydrophone node segment in all directions remain consistent, and is convenient for signal processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the solid-state shore-based optical fiber hydrophone array segment structure provided by the present invention.

[0019] Figure 2 It is a schematic diagram of the exploded structure of the solid-state shore-based optical fiber hydrophone array segment provided by the present invention.

[0020] Figure 3 It is a cross-sectional schematic diagram of the transmission optical cable provided by the present invention.

[0021] Figure 4 The figure is a schematic diagram of the internal structure of the solid-state shore-based optical fiber hydrophone array segment structure provided by the present invention.

[0022] Figure 5 It is a schematic diagram of the structure of the transmission optical cable and the optical fiber hydrophone node segment provided by the present invention.

[0023] Figure 6 It is a schematic structural diagram of the distance L between two adjacent fiber optic hydrophone node segments provided by the present invention.

[0024] Figure 7 It is a simplified schematic diagram of the structure of the storage bin and optical components provided by the present invention.

[0025] Figure 8 The figure is a schematic diagram of the installation of the lateral pressure resistant support frame provided by the present invention.

[0026] Fig. 9 The present invention provides a schematic diagram of the installation of a watertight connector, a transmission optical cable, an optical fiber hydrophone node section and a support section.

[0027] Fig.10 It is a schematic diagram of the structure of the armored joint box provided by the present invention, wherein the figure shows the matching state of two armored joint boxes at opposite ends of the array segment body of two array segment structures.

[0028] Reference numerals: 110, transmission optical cable; 111, central load-bearing unit; 112, pre-branching optical signal unit; 113, first buffer layer; 114, reinforcement; 115, water-blocking adhesive layer; 116, PET isolation tape layer; 117, second buffer layer; 118, corrugated armor layer; 119, protective sheath layer; 120, fiber optic hydrophone node segment; 130, support segment; 140, fiber optic hydrophone array element; 141, fiber optic hydrophone component; 142, storage compartment; 143, fiber optic coupler; 144, Faraday rotator mirror; 150, lateral pressure-resistant support frame; 160, glue-potting joint; 170, outer sheath; 180, potting adhesive layer; 190, second buckle ring; 210, watertight connector; 220, armored joint box; 221, armored joint; 222, bending limiter; 300, armored protective layer; 400, hydrogen-blocking fiber paste. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the related technology, fiber optic hydrophones can be divided into interference type, intensity type and grating type. Interference type fiber optic hydrophones are becoming more and more mature. They are mainly based on the principle of Michelson interferometer. The laser emitted by the laser is divided into two paths through the 3dB fiber coupler 143; one path constitutes the sensor arm of the fiber optic interferometer, which receives the modulation of the sound source, and the other path constitutes the reference arm, which provides the reference phase. The two beams are reflected by the rear reflective film and return to the fiber coupler 143, where interference occurs. The interfering light signal is converted into an electrical signal by the photodetector, and the sound wave information can be picked up after signal processing. The fiber optic hydrophone array uses modular design and multiplexing technology to multiplex the fiber optic hydrophone array segments into an array, complete the acquisition of sound field signals, obtain detailed information of the target, realize the positioning of underwater targets, and use fewer components to form a large-aperture distributed fiber optic hydrophone linear array, reducing the complexity of maintenance.

[0031] The fiber optic hydrophone array includes shore-based fixed array, surface towed array, submerged buoy and side array, etc., and the related applications cover sea areas shallower than 4000m. The solid shore-based array has high mechanical strength and good watertightness. The main array formation methods are: 1. Based on most of the existing towed array structures, the array is composed of aramid rope or steel wire rope as the load-bearing unit, and the fiber optic hydrophone and each optical device storage unit and the array support are fixed on the aramid rope or steel wire rope. The fiber optic hydrophone signal is connected and transmitted through the transmission optical cable 110. The array outer sheath 170 is filled with sound-permeable liquid or sound-permeable glue, and the overall density can be made very large. However, due to the limited length margin of the optical cable inside the array and the lack of reliable protection, the extrusion and twisting during the packaging and recovery and deployment process can easily lead to fiber breakage of the optical cable, which in turn causes the signal loss of a large area of ​​the fiber optic hydrophone array element 140, and the reliability is poor. 2. The transmission optical cable 110 is compatible with the load-bearing unit and the signal transmission unit. The optical fiber hydrophone array element 140 and the transmission optical cable 110 are plugged in at the side to achieve signal transmission through the main cable. However, due to the structural influence of the transmission main cable, it is difficult to ensure that the signals received by the optical fiber hydrophone array element 140 in all directions remain consistent, which has an adverse effect on signal processing. At the same time, the outer diameter of the side plug-in position is larger than that of other positions. During the recovery and deployment process, the extrusion and torsion of this position increase the difficulty of construction, and the reliability is average.

[0032] Therefore, high reliability, large aperture, long-distance transmission, and easy assembly array are issues that need to be urgently addressed in the current engineering process.

[0033] Combine the following Figure 1-Figure 10 The present invention describes a solid-state shore-based optical fiber hydrophone array segment structure and an optical fiber hydrophone array assembly.

[0034] It is understandable that, referring to Figure 1 , Figure 2 , Figure 4 and Fig. 9 The present invention provides a solid-state shore-based optical fiber hydrophone array segment structure, including an array segment body and two joint units, the array segment body includes a transmission optical cable 110, an optical fiber hydrophone node segment 120 and a support segment 130, the optical fiber hydrophone node segment 120 and the support segment 130 are both arranged on the transmission optical cable 110 along the length direction of the transmission optical cable 110, and the transmission optical cable 110 is connected to the optical fiber hydrophone node segment 120 for signal transmission; the two joint units are respectively located at opposite ends of the array segment body, the joint unit at least includes a watertight connector 210, and the watertight connector 210 is connected to the transmission optical cable 110; Among them, an armored protective layer 300 is provided on the array segment body, and the armored protective layer 300 is used to cover the transmission optical cable 110, the optical fiber hydrophone node segment 120, the support segment 130 and the watertight connector 210.

[0035] The solid-state shore-based fiber optic hydrophone array segment structure provided by the present invention improves the watertight performance of the array segment structure by providing watertight connectors 210 at both ends of the array segment body; in addition, an armored protective layer 300 is provided on the outside of the array segment body to ensure the side pressure tolerance performance of the fiber optic hydrophone node segment 120 of the array segment structure, and to enhance the protection capability and mechanical strength of the array segment structure, which is beneficial to ensure that the signals received by the fiber optic hydrophone node segment 120 in all directions remain consistent, facilitating signal processing.

[0036] It should be noted that, in the embodiment of the present invention, the number of layers of the armor protection layer 300 is configured as a single layer or multiple layers. Selecting a suitable single-layer or multi-layer configuration can achieve a better protection effect. Specifically, in this embodiment, when the armor protection layer 300 is a single-layer armor, its twisting direction is S direction; when the armor protection layer 300 is a double-layer armor, the inner armor protection layer 300 is twisted in the S direction, and the outer armor protection layer 300 is twisted in the Z direction.

[0037] It should also be noted that in the embodiment of the present invention, the outer wall of the above-mentioned armor protective layer 300 is also wrapped with an outer armor steel belt and a first buckling ring. After the outer wall of the armor protective layer 300 is wrapped with the outer armor steel belt, the first buckling ring is buckled at a certain interval to fix the armor protective layer 300 and the outer armor steel belt to avoid loosening under external force conditions, so as to further improve the structural strength and stability of the armor protective layer 300.

[0038] It is understandable that, referring to Fig.10 In an embodiment of the present invention, the fiber optic hydrophone array assembly includes a plurality of the above-mentioned solid-state shore-based fiber optic hydrophone array segment structures, wherein the plurality of array segment bodies are sequentially connected through a connector unit.

[0039] Specifically, in this embodiment, the array segment bodies of multiple array segment structures can be connected in series through the watertight connector 210 of the connector unit, thereby increasing the aperture of the fiber optic hydrophone array, implementing long-distance deployment, and improving the information collection capacity. It should be noted that the above-mentioned fiber optic hydrophone array aperture can be understood as the increase in the detection range due to the increase in the detection length.

[0040] Of course, in other embodiments of the present invention, referring to Figure 1 , Figure 2 , Figure 4 and Fig.10The joint unit also includes an armored joint box 220, a part of which is connected to the transmission optical cable 110, and another part of which is connected to the armored protective layer 300; wherein, the opposite ends of two adjacent array segment bodies are correspondingly connected through the armored joint boxes 220 arranged thereon. It can be understood that after the array segment structure with the armored joint box 220 is installed, the adjacent array segment structures can be serially connected through the armored joint box 220, thereby increasing the aperture of the optical fiber hydrophone array, implementing long-distance deployment, and improving the information collection capacity.

[0041] Specifically, refer to Figure 4 and Fig.10 In this embodiment, the armored joint box 220 includes an armored joint 221 and a bending limiter 222. The armored joint 221 is installed on the transmission optical cable 110. A part of the structure of the bending limiter 222 is connected to the armored joint 221, and the other part is connected to the armored protective layer 300. It can be understood that after the outer wall of the array segment body is assembled with the armored protective layer 300, the armored joint 221 can be assembled with the transmission optical cable 110. After the assembly is completed, one end of the bending limiter 222 is assembled on a part of the structure of the armored joint 221, and the other part of the structure of the armored joint 221 is exposed to the bending limiter 222. The other end of the bending limiter 222 is assembled on the outside of the armored protective layer 300, thereby improving the structural stability and structural strength of the armored joint box 220, limiting the bending degree at the connection position of the two adjacent array segment structures, improving the convenience of assembly, reducing the construction difficulty during the recovery and deployment process, and having high reliability.

[0042] It should be noted that in this embodiment, adjacent array segment structures can be serially connected through corresponding armored joints 221; the cross-section of the array segment structure is cylindrical, and the cylindrical shape is suitable for most offshore recovery and deployment devices, reducing the difficulty of construction; through the armored joints 221 and the bending limiter 222, each fiber optic hydrophone array segment structure is connected in sequence through the corresponding joint unit. The fiber optic hydrophone array segment structure of a certain length is connected to the fiber optic hydrophone array structure of the required length through the joint unit, and the joint unit can also be used for the connection between the array segment and the transmission optical cable 110.

[0043] It should also be noted that, in the embodiment of the present invention, the armored joint 221 is made of 316L, duplex stainless steel or titanium alloy; the bending limiter 222 is made of rubber or stainless steel, titanium alloy, and its shape is spindle-shaped or bamboo-shaped; in this embodiment, the armored joint 221 and the bending limiter 222 are split structures. Of course, in some embodiments, an integrated structure can also be formed by injection molding or other methods.

[0044] It is understandable that, referring to Figure 2 , Figures 4 to 9In the embodiment of the present invention, the array segment body includes a fiber optic hydrophone array element 140, a plurality of lateral pressure resistant support skeletons 150, a plurality of glue-filling joints 160 and an outer sheath 170. The fiber optic hydrophone array element 140 is installed on the transmission optical cable 110, and is connected to the transmission optical cable 110 for signal transmission; the plurality of lateral pressure resistant support skeletons 150 are installed on the transmission optical cable 110 along the length direction of the transmission optical cable 110; the plurality of glue-filling joints 160 are installed on the transmission optical cable 110 along the length direction of the transmission optical cable 110, and the glue-filling joints 160 are provided with glue-filling ends for glue-filling; the outer sheath 170 is disposed on the transmission optical cable 110, the fiber optic hydrophone array element 140, the plurality of lateral pressure resistant support skeletons 150 and the plurality of glue-filling joints 160. The structure is as follows: the outer sheath 170 is arranged to avoid the glue pouring end, and the glue pouring end is connected to the inside of the outer sheath 170, so that a potting glue layer 180 is formed inside the outer sheath 170; wherein, the outer sheath 170 and each glue pouring joint 160 are provided at corresponding positions thereof with a second buckling ring 190 for locking the two, and part of the lateral pressure-resistant support skeleton 150, part of the glue pouring joint 160, part of the outer sheath 170 and part of the potting glue layer 180 cooperate to form the support section 130; at least the optical fiber hydrophone array element 140, another part of the lateral pressure-resistant support skeleton 150, another part of the glue pouring joint 160, another part of the outer sheath 170, another part of the potting glue layer 180 and another part of the second buckling ring 190 cooperate to form the optical fiber hydrophone node section 120.

[0045] The above structure further improves the protection of the transmission optical cable 110 and the optical fiber hydrophone array element 140; by providing a potting joint 160 and forming a potting glue layer 180 in the outer sheath 170, the potting glue layer 180 seals and protects the optical fiber hydrophone array element 140, multiple lateral pressure-resistant support skeletons 150 and the transmission optical cable 110, thereby improving the sealing performance. At the same time, multiple lateral pressure-resistant support skeletons 150 are provided, so that the structure has a strong tensile strength, improves the lateral pressure resistance performance, and can be used in harsh deep-sea environments for a long time, especially suitable for marine monitoring environments with heavy sea surface moisture and high seabed pressure.

[0046] It should be noted that, refer to Figure 8 In an embodiment of the present invention, a plurality of lateral pressure-resistant support skeletons 150 are serially and evenly distributed on the transmission optical cable 110; the lateral pressure-resistant support skeleton 150 is made of ABS, low-density composite material, 7075 aluminum alloy or 316L stainless steel; the glue-filled joint 160 is made of 316L stainless steel, aluminum alloy or TC4 titanium alloy; the outer sheath 170 is made of PE, PU or a PU material hose filled with 316L stainless steel wire, wherein the diameter of the 316L stainless steel wire is 0.5 mm to 1.0 mm; the watertight connector 210, the first buckling ring and the second buckling ring 190 are all made of 316L stainless steel or TC4 titanium alloy.

[0047] In this embodiment, a potting material such as polyether polyurethane or gel is filled inside the outer sheath 170 through a potting joint 160 to form a potting glue layer 180 .

[0048] It can be understood that, in the embodiment of the present invention, the array segment body also includes a hydrophone protective cover, which is sleeved on the outside of the outer sheath 170 and corresponds to the position of the optical fiber hydrophone array element 140. It can be understood that the hydrophone protective cover is located directly above the optical fiber hydrophone array element 140 to further improve the protection performance of the optical fiber hydrophone array element 140. Specifically, in this embodiment, the hydrophone protective cover can be made of plastic, metal and other materials, and the appearance of the hydrophone protective cover is straight or spindle-shaped, and the sound-permeable hole can be designed and processed according to the requirements of the hydrophone array.

[0049] It is understandable that, referring to Figures 4 to 7 as well as Fig. 9 In the embodiment of the present invention, the fiber optic hydrophone array element 140 includes a fiber optic hydrophone component 141 and a storage bin 142. The fiber optic hydrophone component 141 is installed on the transmission optical cable 110, and the fiber optic hydrophone component 141 is connected to the transmission optical cable 110 for signal transmission; the storage bin 142 is used to store optical components, and the storage bin 142 is installed on the transmission optical cable 110. The optical components in the storage bin 142 are connected to the fiber optic hydrophone component 141 to form a multiplexed optical link. With the above structure, the transmission optical cable 110 is connected at the fiber optic hydrophone node section 120 through the fiber optic hydrophone component 141 and the storage bin 142, which provides enhanced protection of mechanical strength.

[0050] It should be noted that, refer to Figure 7 In this embodiment, the storage bin 142 is provided with optical components such as an optical fiber coupler 143, a Faraday rotator mirror 144 and a wavelength division multiplexer. At the same time, the storage bin 142 is filled with a hydrogen-blocking fiber paste 400. The optical fiber hydrophone array element 140 collects and transmits signals through the transmission optical cable 110 using time division, wavelength division and space division multiplexing. The optical fiber hydrophone and the storage bin 142 are connected as a whole by load-bearing screws. The storage bin 142 is made of 7075 aluminum alloy, stainless steel or titanium alloy.

[0051] It can be understood that, in this embodiment, the number of array segments is n, and the number of fiber optic hydrophone node segments 120 is n, which is a positive integer. Figure 2 , Figure 4 , Figure 6 and Fig. 9In each array segment structure, there are two groups of fiber optic hydrophone node segments 120 and one group of support segments 130, and the two groups of fiber optic hydrophone node segments 120 are respectively located at opposite ends of the support segment 130. Specifically, in this embodiment, the spacing between the two groups of fiber optic hydrophone node segments 120 is L, which can be understood as being determined by the detection frequency, with a minimum of 0.75 m and a maximum of 200 m. The spacing L between the fiber optic hydrophone node segments 120 refers to the distance between the acoustic centers of adjacent fiber optic hydrophone components 141.

[0052] It is understandable that, referring to Figure 3 In an embodiment of the present invention, the transmission optical cable 110 includes a central load-bearing unit 111, a plurality of pre-branching optical signal units 112 and a protective sleeve unit. The plurality of pre-branching optical signal units 112 are arranged around the central load-bearing unit 111, and the protective sleeve unit is covered on the outside of the plurality of pre-branching optical signal units 112.

[0053] With the above structure, the central load-bearing unit 111 provides overall support and tension, the pre-branching optical signal unit 112 is responsible for transmitting signals, and the protective sleeve unit protects the optical cable structure. Through the covering of the protective sleeve unit, the pre-branching optical signal unit 112 is protected, thereby extending the service life of the optical cable; different parts of the units perform their respective functions, realizing the division of labor between signal transmission and structural protection, and improving reliability and stability.

[0054] Specifically, refer to Figure 3 In this embodiment, a first buffer layer 113 is provided between the central load-bearing unit 111 and the pre-branching optical signal unit 112. The first buffer layer 113 can reduce the impact of vibration and impact on the optical cable structure during transmission. When external force is applied to the optical cable, the first buffer layer 113 can absorb part of the energy, reduce the interference of the transmission signal, help maintain the integrity of the optical cable structure, and reduce the possibility of damage caused by changes in the external environment.

[0055] Specifically, refer to Figure 3 In this embodiment, a reinforcement member 114 and a water-blocking adhesive layer 115 are provided between two adjacent pre-branching optical signal units 112, which can provide structural stability, waterproof protection, isolation and protection, and maintain signal quality, thereby enhancing the reliability and durability of the optical cable system.

[0056] Specifically, refer to Figure 3 In this embodiment, the protective sleeve unit includes a PET isolation tape layer 116, a second buffer layer 117, a corrugated armor layer 118 and a protective sleeve layer 119. The PET isolation tape layer 116, the second buffer layer 117, the corrugated armor layer 118 and the protective sleeve layer 119 are sequentially arranged from close to to far away from the pre-branching optical signal unit 112.

[0057] With the above configuration, the presence of the PET isolation tape layer 116 can provide a layer of isolation and protection in the structure of the protective sheath unit, which helps to maintain the integrity and safety of the internal pre-branching optical signal unit 112; the configuration of the second buffer layer 117 can provide additional buffering and shock absorption effects, protecting the internal structure from external vibration and impact; the corrugated armor layer 118 is used to provide the tensile performance of the optical cable, enhance the tensile strength and durability of the transmission optical cable 110, and help protect the internal pre-branching optical signal unit 112 from external forces, and the protective sheath layer 119 is the outermost layer of the optical cable, providing the final protection and resistance to external environmental influences, and can be waterproof, dustproof, and moisture-proof, protecting the entire transmission optical cable 110. Therefore, the sequential set configuration of the PET isolation tape layer 116, the second buffer layer 117, the corrugated armor layer 118, and the protective sheath layer 119 can provide multi-level protection and isolation effects, protect the internal pre-branching optical signal unit 112, and enhance the overall stability and durability of the transmission optical cable 110.

[0058] Of course, in some embodiments, the protective sleeve unit includes a PET isolation tape layer 116 , a second buffer layer 117 and a protective sleeve layer 119 , which is not limited herein.

[0059] It should be noted that, in the embodiment of the present invention, the first buffer layer 113 and the second buffer layer 117 are both made of polyolefin material; the corrugated armor layer 118 is made of stainless steel, copper or aluminum material through a longitudinal wrapping welding process; the protective sheath layer 119 is made of HDPE or TPU material; and the reinforcement 114 is a high-strength galvanized steel wire.

[0060] Specifically, in the embodiment of the present invention, the central load-bearing unit 111 is made of steel wire with an adaptive strength; the number of pre-branching optical signal units 112 increases or decreases according to the optical path structure of the fiber optic hydrophone array segment, and the pre-branching optical signal unit 112 includes a steel pipe and an optical fiber arranged in the steel pipe. The steel pipe is made of 316L stainless steel material, and the interior of the steel pipe is filled with hydrogen-blocking fiber paste 400; in each array segment structure, the pre-branching optical signal unit 112 of the transmission optical cable 110 is connected to the signal through the fiber optic hydrophone component 141 and the storage bin 142 of the fiber optic hydrophone array element 140 at the fiber optic hydrophone node segment 120, and the signal multiplexing of each fiber optic hydrophone array element 140 is relatively independent. The failure of an individual fiber optic hydrophone array element 140 does not affect the performance of other fiber optic hydrophone array elements 140, thereby improving the reliability of the array segment structure.

[0061] It should be noted that, in the embodiment of the present invention, the armor material can be made of stainless steel wire, galvanized steel wire, FRP and the like alone, or can be mixed and used in combination with PE coating.

[0062] It can be understood that, in the embodiment of the present invention, the assembly method of the above array segment structure is as follows: First: the first buffer layer 113, the reinforcement 114, the water-blocking adhesive layer 115, the PET isolation tape layer 116, the second buffer layer 117, the corrugated armor layer 118 and the protective sheath layer 119 of the transmission optical cable 110 are stripped off at every interval L, the designated pre-branching optical signal unit 112 is disconnected, and the internal transmission optical fiber is led out.

[0063] The distance between the acoustic centers of adjacent optical fiber hydrophone acoustic components is L, and the designated pre-branch optical signal is disconnected and led out of the transmission optical fiber every L distance. When the number of optical fiber hydrophone node segments 120 is 2, the number of disconnected pre-branch optical signal units 112 is 1, and when the number of optical fiber hydrophone node segments 120 is greater than 2, the minimum number of disconnected pre-branch optical signal units 112 is 2.

[0064] Second: fix the pre-branching optical signal unit 112 of the lead-out transmission optical fiber into the storage bin 142 through a gasket and a sealing O-ring for connection of the transmission optical path.

[0065] Third: fix the fiber optic hydrophone component 141 to one side of the storage compartment 142 by means of load-bearing screws, and fix the pigtail of the fiber optic hydrophone component 141 in the storage compartment 142 for connection of the transmission optical path.

[0066] Fourth: Install optical components such as the fiber coupler 143 and the Faraday rotator mirror 144 into the storage bin 142, and use a fiber fusion splicing device in the storage bin 142 to fusion-splice the components and the fiber optic hydrophone's pigtails to form a multiplexed optical link.

[0067] Fifth: straighten out the pigtails of the optical components that have been fused and debugged and coil them into the storage bin 142, then fill them with hydrogen-blocking fiber paste 400, install the sealing cover, install an O-ring at the bottom of the sealing cover, and fasten them with screws on both sides.

[0068] Sixth: Install the lateral pressure resistant support frame 150 on the transmission optical cable 110. The frame material and the frame spacing can be adjusted according to the weight and density requirements of the optical fiber hydrophone array segment structure.

[0069] Seventh: Assemble the second crimping ring 190 and the hydrophone protective cover on the outer sheath 170; Assemble the outer sheath 170 to the outside, i.e., the upper part, of the lateral pressure-resistant support frame 150 in the optical fiber hydrophone array segment structure, with both ends of the outer sheath 170 at the position of the glue potting joint 160; Use a tube shrinking machine to crimp the second crimping ring 190 and the end of the outer sheath 170 to the specified size position of the glue potting joint 160.

[0070] Eighth: Use a two-component vacuum glue potting machine to pour the potting glue into the outer sheath 170 through the glue potting joint 160 to ensure that there is no defect such as empty glue and bubbles at the position of the optical fiber hydrophone node section 120.

[0071] Ninth: two watertight connectors 210 are respectively mounted on the head and tail sides of the fiber optic hydrophone array segment structure to connect the transmission optical cable 110 or other fiber optic hydrophone array segment structures, thereby forming a complete seafloor array detection link.

[0072] Tenth: The complete optical fiber hydrophone array is subjected to rotational twisting of the armored protective layer 300 by using a cage twisting machine. In the case of single-layer armor, the twisting direction is S direction; in the case of double-layer armor, the inner layer is twisted in S direction and the outer layer is twisted in Z direction; the array after the armor twisting is completed is wrapped with the outer armor steel tape through the wrapping head. In the case of single-layer armor, the wrapping direction is Z direction, and in the case of double-layer armor, the wrapping direction is S direction.

[0073] Eleventh: The array segment structure completed by wrapping the outer armor steel belt is buckled with the first buckling ring at a certain interval to fix the armor protection layer 300 and the outer armor steel belt to avoid loosening under external force conditions.

[0074] Twelfth: Assemble the armored joint box 220 at both ends of the armored segment structure, that is, install the armored joint 221 and the bend limiter 222 at the end of the transmission optical cable 110 and cooperate with the armored protective layer 300.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A solid-state shore-based optical fiber hydrophone array segment structure, characterized in that: include: An array segment body, the array segment body comprising a transmission optical cable (110), an optical fiber hydrophone node segment (120) and a support segment (130), the optical fiber hydrophone node segment (120) and the support segment (130) being arranged on the transmission optical cable (110) along the length direction of the transmission optical cable (110), and the transmission optical cable (110) and the optical fiber hydrophone node segment (120) being connected to each other for signal transmission; Two joint units, the two joint units are respectively located at two opposite ends of the array segment body, the joint units at least comprising a watertight connector (210), the watertight connector (210) being connected to the transmission optical cable (110); Wherein, an armored protective layer (300) is provided on the array segment body, and the armored protective layer (300) is used to cover the transmission optical cable (110), the optical fiber hydrophone node segment (120), the support segment (130) and the watertight connector (210).

2. The solid-state shore-based optical fiber hydrophone array segment structure according to claim 1 is characterized in that: The joint unit further comprises an armored joint box (220), a part of the structure of the armored joint box (220) being connected to the transmission optical cable (110), and another part of the structure being connected to the armored protective layer (300); Wherein, the opposite ends of two adjacent array segment bodies are correspondingly connected via the armored joint boxes (220) arranged thereon.

3. The solid-state shore-based optical fiber hydrophone array segment structure according to claim 2 is characterized in that: The armored joint box (220) comprises: An armored joint (221), the armored joint (221) being installed on the transmission optical cable (110); A bending limiter (222), wherein a portion of the structure of the bending limiter (222) is connected to the armor joint (221), and another portion is connected to the armor protection layer (300).

4. The solid-state shore-based optical fiber hydrophone array segment structure according to claim 1, characterized in that: The array segment body comprises: A fiber optic hydrophone array element (140), the fiber optic hydrophone array element (140) being installed on the transmission optical cable (110) and connected to the transmission optical cable (110) for signal transmission; A plurality of lateral pressure resistant support frames (150), wherein the plurality of lateral pressure resistant support frames (150) are installed on the transmission optical cable (110) along the length direction of the transmission optical cable (110); A plurality of glue-pouring joints (160), wherein the plurality of glue-pouring joints (160) are installed on the transmission optical cable (110) along the length direction of the transmission optical cable (110), and the glue-pouring joints (160) are provided with glue-pouring ends for glue-pouring; an outer sheath (170), the outer sheath (170) being disposed on a portion of the transmission optical cable (110), the optical fiber hydrophone array element (140), the plurality of lateral pressure-resistant support skeletons (150), and the plurality of glue-potting joints (160); the outer sheath (170) being arranged to avoid the glue-potting end, and the glue-potting end being in communication with the interior of the outer sheath (170), so as to form a potting glue layer (180) inside the outer sheath (170); A second buckling ring (190) for locking the outer sheath (170) and each of the glue-potting joints (160) is provided at a corresponding position of the outer sheath (170) and each of the glue-potting joints (160); a portion of the lateral pressure-tolerant support frame (150), a portion of the glue-potting joint (160), a portion of the outer sheath (170) and a portion of the sealing glue layer (180) cooperate to form the support section (130); and at least the optical fiber hydrophone array element (140), another portion of the lateral pressure-tolerant support frame (150), another portion of the glue-potting joint (160), another portion of the outer sheath (170), another portion of the sealing glue layer (180) and another portion of the second buckling ring (190) cooperate to form the optical fiber hydrophone node section (120).

5. The solid-state shore-based optical fiber hydrophone array segment structure according to claim 4 is characterized in that: The optical fiber hydrophone array element (140) comprises: an optical fiber hydrophone component (141), the optical fiber hydrophone component (141) being installed on the transmission optical cable (110), and the optical fiber hydrophone component (141) and the transmission optical cable (110) being connected to each other for signal transmission; A storage bin (142) is used to store optical components; the storage bin (142) is installed on the transmission optical cable (110); the optical components located in the storage bin (142) are connected to the optical fiber hydrophone component (141) to form a multiplexed optical link.

6. The solid-state shore-based optical fiber hydrophone array segment structure according to any one of claims 1 to 5, characterized in that: The transmission optical cable (110) comprises: Central load-bearing unit (111); A plurality of pre-branching optical signal units (112), wherein the plurality of pre-branching optical signal units (112) are arranged around the central force-bearing unit (111); A protective sleeve unit, the protective sleeve unit covering the outside of the plurality of pre-branching optical signal units (112).

7. The solid-state shore-based optical fiber hydrophone array segment structure according to claim 6, characterized in that: A first buffer layer (113) is provided between the central load-bearing unit (111) and the pre-branching optical signal unit (112).

8. The solid-state shore-based optical fiber hydrophone array segment structure according to claim 6, characterized in that: A reinforcing member (114) and a water-blocking adhesive layer (115) are provided between two adjacent pre-branching optical signal units (112).

9. The solid-state shore-based optical fiber hydrophone array segment structure according to claim 6, characterized in that: The protective sleeve unit comprises a PET isolation tape layer (116), a second buffer layer (117), a corrugated armor layer (118) and a protective sleeve layer (119); the PET isolation tape layer (116), the second buffer layer (117), the corrugated armor layer (118) and the protective sleeve layer (119) are sequentially arranged in a direction from close to to far from the pre-branching optical signal unit (112).

10. A fiber optic hydrophone array assembly, characterized in that: include: A solid-state shore-based fiber optic hydrophone array segment structure as described in any one of claims 1 to 9, wherein a plurality of said array segment bodies are connected in sequence via said connector unit.

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