Stealth underwater detection photoelectric cable and manufacturing method

Abstract

The application relates to a stealth underwater detection photoelectric cable and a manufacturing method, which comprises a cable core, a protective sleeve arranged on the outer periphery of the cable core, a protective inner ring and a deformation layer in an integrated structure, the deformation layer is composed of annularly-distributed deformation protrusions, the deformation protrusions are spirally arranged on the outer periphery of the protective inner ring, and the radial cross-sectional shape of the deformation protrusions continuously changes. The outer periphery of the protective sleeve of the application is arranged with the SZ spiral deformation protrusions, which have different reflection surfaces at different positions. If a stealth coating is further coated on the outer surface of the deformation protrusions of the protective sleeve, the reflection surfaces of electromagnetic waves and shock waves in different directions and areas are formed, the electromagnetic waves and shock waves emitted by competitors are dispersed through the reflection surfaces of the stealth coating on the two sides of the deformation protrusions, the strength of the reflection echo of the detection cable is greatly reduced, and the effective reflection area of the cable is greatly reduced.

Description

Technical Field

[0001] This invention belongs to the field of optical cable technology, and relates to a stealthy underwater detection optical cable and its manufacturing method. Background Technology

[0002] Underwater optical cables used in marine applications typically consist of insulated wires, optical fiber units, water-sealing materials, reinforcing components, and protective sheaths. If underwater detection capabilities are added, additional electronic components, photoelectric and acoustic sensors, etc., are also incorporated internally or at joints. Their basic function is to provide power via insulated wires, transmit communication via optical fibers, and use gratings, electronic components, and photoelectric sensors to receive specific detection signals such as electromagnetic and acoustic signals transmitted underwater. The most commonly used protective sheaths for these underwater optical cables are made of polymer materials such as polyurethane and polyolefin sheaths. The sheath structure is primarily tubular, with several regularly arranged longitudinal arc-shaped strips added to the outer circumference for ease of handling.

[0003] Typical underwater fiber optic cables have a regular shape and contain metal conductors or reinforcements and electronic components. After being laid and networked on the seabed, they present a challenge: competitors can use various methods to detect their cables from a distance, while the provider can accurately locate and detect the cables when needed. This creates a technical conflict between the two sides regarding the stealth and counter-surveillance capabilities of the cables and the need for precise detection and location. On the one hand, competitors need to lay their cables stealthily on the seabed to make them difficult to detect; on the other hand, the provider needs to be able to easily detect the precise location of the cables.

[0004] In stealth technology for aircraft, ships, and submersibles, there are two basic principles and main technical approaches. One is to modify the design of the object's shape and structure, transforming large flat surfaces into small reflective surfaces in multiple directions to reduce the reflection area of ​​electromagnetic sound waves and vibration shock waves. The other is to cover the surface of the reflective surface with a stealth coating to reduce the intensity of signals emitted or reflected by the target itself, or to reduce the signal contrast between the target and the environment, making it lower than the detector's threshold; or to disrupt the contrast pattern between the target and the environment, making it difficult to identify the target's geometry. Different stealth coatings, due to their different materials, have good wave absorption performance within a specific frequency range. One type of detection method commonly used underwater by ships and submersibles is sonar; another type, used for underwater detection of terrain and the properties and distribution of surrounding objects, employs vibration shock waves similar to those generated by blasting. Both methods determine the shape, size, and properties of the measured object by receiving the intensity and effective area of ​​the reflected echo. Underwater optical cables that transmit electrical power emit relatively weak electromagnetic signals. Due to the significant attenuation of electromagnetic waves underwater, detection can only be conducted at close range by measuring the electromagnetic waves scattered by leakage within the cable itself. Publicly available information on counter-surveillance and detection / location technologies for stealthy underwater optical cables is also scarce.

[0005] Therefore, researching and developing new stealthy underwater detection optical cables, adopting appropriate stealth and detection methods, designing reasonable external structures, and using stealth materials to achieve stronger stealth effects, in order to solve the technical conflict between stealth and counter-surveillance and precise detection and positioning of underwater detection optical cables, has become one of the cutting-edge technical topics in this research field. Summary of the Invention

[0006] The purpose of this invention is to provide a stealthy underwater detection optical cable and its manufacturing method, which solves the problems of stealth, detection method, and structural design of the stealthy underwater detection optical cable, giving the optical cable the dual characteristics of stealth anti-spying and precise detection and positioning. The invention adopts a new technology process, which realizes the distribution of deformable protrusions arranged in an SZ spiral pattern around the protective sleeve, forming a reflective surface structure with different reflection angles and areas, which significantly reduces the effective reflection echo signal area and intensity of the optical cable itself and the detection wave.

[0007] According to the technical solution provided by the present invention: a stealthy underwater detection optical cable includes a cable core, and a protective sleeve is provided on the outer periphery of the cable core. The protective sleeve is characterized in that the protective sleeve is an integral protective inner ring and a deformable layer. The deformable layer is composed of annularly distributed deformable protrusions, and the deformable protrusions are spirally arranged on the outer periphery of the protective inner ring. The radial cross-sectional shape of the deformable protrusions changes continuously.

[0008] As a further improvement of the present invention, the two sides of the radial section of the deformable protrusion are the left side and the right side of the deformable protrusion, which are symmetrically arranged.

[0009] As a further improvement of the present invention, the left side of the deformable protrusion is composed of the connected upper left side and lower left side, and the right side of the deformable protrusion is composed of the connected upper right side and lower right side. The lower left side, lower right side and the protective inner ring are connected, and the ends of the upper left side and upper right side are connected. The lengths of the upper left side and upper right side change continuously, and the included angle α between the upper left side and lower left side, and between the upper right side and lower right side changes continuously.

[0010] As a further improvement of the present invention, the cable core includes a protective layer, in which a leaky optical cable, several power lines, several signal line groups, one or more optical fiber units, several components, and several sensors are disposed, and the gaps inside the protective layer are filled with sealing material.

[0011] As a further improvement of the present invention, the protective sleeve is made of polyurethane or polyolefin.

[0012] As a further improvement of the present invention, the deformable protrusions are arranged in an SZ spiral pattern on the outer periphery of the inner protective ring; the swing deflection angle of the deformable protrusions ranges from 90° to 360°; and the pitch of the deformable protrusions ranges from a pitch ratio of 5 to 30.

[0013] A method for manufacturing a stealthy underwater detection optical cable, the method being used to manufacture the stealthy underwater detection optical cable as described above, comprising the following steps: Step 1: Prepare the cable core; Step two: Perform straight-line pulling of the optical cable; 1. Prepare the mold assembly, which consists of a mold core, a first mold sleeve, a second mold sleeve, and a third mold sleeve. The mold core is located at the center of the first mold sleeve, and the mold core and the first mold sleeve form a mold material channel. The second mold sleeve and the third mold sleeve are arranged sequentially on the side of the first mold sleeve. The end of the first mold sleeve is provided with a first mold through hole. The inner wall of the first mold through hole is continuously provided with a first corner groove. The two sides of the first corner groove are symmetrically arranged first left groove side and first right groove side. The second mold sleeve is provided with a second mold through hole in the middle. The inner wall of the second mold through hole is continuously provided with a second corner groove. The two sides of the second corner groove are asymmetrically arranged second left groove side and second right groove side. The third mold sleeve is provided with a third mold through hole in the middle. The inner wall of the third mold through hole is continuously provided with a third corner groove. The two sides of the third corner groove are asymmetrically arranged third left groove side and third right groove side. 2. The cable core is released from the pay-off reel, passes through the mold core of the mold assembly, the first mold through hole, the second mold through hole, and the third mold through hole, and then passes through the cold water tank and is connected to the traction device. The traction device presses down the cooled and shaped optical cable and prevents the optical cable from twisting. Step 3: Extruding a protective sleeve onto the outer periphery of the cable core; ①. Feeding of the protective sleeve: The high-temperature molten material of the protective sleeve is extruded into the die channel in the rotating extruder head through the extruder, and wraps around the cable core; ②. Initial extrusion; At the initial extrusion position, the hollow portion of the first mold through hole of the first mold sleeve, the second mold through hole in the middle of the second mold sleeve, and the third mold through hole in the middle of the third mold sleeve in the axial projection is the first mold through hole of the first mold sleeve; ③. The first, second, and third molds are extruded in the same direction at a differential speed.

[0014] As a further improvement of the present invention, in step three, ③, the first mold sleeve, the second mold sleeve, and the third mold sleeve rotate clockwise, the rotation speed of the second mold sleeve gradually becomes less than the rotation speed of the first mold sleeve, and the rotation speed of the third mold sleeve gradually becomes greater than the rotation speed of the first mold sleeve. The second right groove edge of the second mold sleeve and the third left groove edge of the third mold sleeve gradually and symmetrically enter the axial projection of the first corner groove on the first mold sleeve. The portions of the second mold sleeve and the third mold sleeve that enter the axial projection of the first corner groove on the first mold sleeve.

[0015] As a further improvement of the present invention, step three, ③. reciprocating in the same direction with differential speed extrusion of the first mold sleeve, the second mold sleeve and the third mold sleeve.

[0016] The positive and progressive effects of this invention are as follows: This invention provides a stealthy underwater detection optical cable and its manufacturing method. It offers a novel stealthy underwater detection optical cable that solves the problems of cable stealth, detection methods, and structural design, giving the cable dual characteristics of stealth anti-reconnaissance and precise detection positioning. This resolves the technical conflict between stealth anti-reconnaissance and precise detection positioning. Furthermore, it employs new technical methods and process equipment, and has the following characteristics: A novel stealth and detection method and structure for a stealthy underwater detection optical cable have been invented. The cable's structure has two main aspects. First, the outer circumference of the cable's protective sheath features deformable protrusions arranged in an SZ spiral pattern, each with different reflective surfaces at different locations. When combined with a stealth coating applied to the outer surface of these deformable protrusions, reflective surfaces of varying directions and areas are formed for electromagnetic waves and vibration shock waves. This disperses the electromagnetic waves and vibration shock waves emitted by a competitor's directional detection cable through the reflective surfaces of the stealth coating on both sides of the deformable protrusions, significantly reducing the intensity of the reflected echo and thus greatly reducing the cable's effective reflective area. Second, this cable structure, when combined with the stealth coating applied to the outer surface of the deformable protrusions of the protective sheath, further enhances its stealth effect. First, the electromagnetic waves scattered by the cable itself are dispersed by the reflective surface of the stealth coating, reducing the intensity of electromagnetic waves leaking outward in specific directions, thus achieving stealth and counter-surveillance capabilities. Second, the stealth coating on the outer perimeter of the protective sheath absorbs the detected electromagnetic waves and vibration shock waves, significantly reducing the echoes displayed on the receiving instruments after competitors have directionally emitted electromagnetic waves and vibration shock waves from the detection cable. This synergistic effect results in extremely low intensity of reflected echoes received by competitors in their detection instruments, making it difficult to determine the cable's size and location amidst the background noise of the marine environment, thus giving the cable stealth and counter-surveillance capabilities.

[0017] When precise location detection is required, the leaky optical cable in the cable actively emits pulsed electromagnetic waves of a specific frequency and waveform. Because the intensity of the actively emitted electromagnetic waves far exceeds the intensity of the electromagnetic waves scattered by the cable itself during normal operation, a detector can be used to receive the pulsed electromagnetic waves of a specific frequency and waveform within a certain range, thereby achieving the effect of precise location detection of the cable.

[0018] A novel manufacturing technology has been invented that incorporates several SZ spiral-shaped deformable protrusions distributed around the outer periphery of a cable's protective sheath. This technology utilizes a rotating extrusion die assembly to generate the SZ spiral-shaped deformable protrusions. Through reciprocating differential speed extrusion in the same direction using three die sleeves, the cable is dynamically manufactured with superimposed SZ spiral-shaped deformable protrusions of continuously varying transverse and longitudinal angles and heights. This results in a reflective surface structure with different reflection angles and areas for probe waves. When this structure is combined with a stealth coating on the deformable protrusions of the protective sheath, optimal reflective surface parameters for probe waves of different frequency bands and waveform characteristics can be obtained. Probe waves emitted from any direction toward the cable will be optimally dispersed and reflected in multiple directions, causing competitors to receive echoes with very small reflection areas and intensities in one direction, thus achieving optimal stealth performance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the stealthy underwater detection optical cable of the present invention.

[0020] Figure 2 This is a cross-sectional view of the stealthy underwater detection optical cable of the present invention.

[0021] Figure 3 for Figure 1 A-direction view.

[0022] Figure 4 for Figure 3 A schematic diagram of the cross-section of the deformable protrusion 3 in region B, which is a triangle.

[0023] Figure 5 This is a schematic diagram of the cross-section of the deformable protrusion 3, which is a pentagon.

[0024] Figure 6 A schematic diagram of a mold assembly for inventing a rotating head.

[0025] Figure 7 This is a schematic diagram of the first mold of the present invention.

[0026] Figure 8 This is a schematic diagram of the second mold of the present invention.

[0027] Figure 9 This is a schematic diagram of the third mold of the present invention.

[0028] Figure 10 This is a schematic diagram of the mold assembly of the present invention.

[0029] Figure 11 This is a schematic diagram showing the clockwise rotation position of the mold assembly for the triangular deformable protrusion 3 of the present invention.

[0030] Figure 12This is a schematic diagram of the clockwise rotation position of the mold assembly of the pentagonal deformable protrusion 3 of the present invention.

[0031] Figure 13 This is a schematic diagram of the counterclockwise rotation position of the mold assembly for the triangular deformable protrusion 3 of the present invention.

[0032] Figures 1-13 The following components are included: 1-Cable core, 11-Leaky optical cable, 12-Power cord, 13-Signal cable assembly, 14-Fiber optic unit, 15-Components, 16-Sensor, 17-Sealing material, 18-Protective sleeve, 2-Protective layer, 3-Deformable protrusion, 3-1-Left side of deformable protrusion, 3-2-Right side of deformable protrusion, 3-11-Upper left side of the left side of deformable protrusion, 3-12-Lower left side of the left side of deformable protrusion, 3- 2-Right side of the deformable protrusion, 3-21-Upper right side of the right side of the deformable protrusion, 3-22-Lower right side of the right side of the deformable protrusion, 41-Material channel, 42-Mold core, 43-Mold sleeve one, 44-Mold sleeve two, 45-Mold sleeve three, 43-1-First left groove side, 43-2-First right groove side, 44-1-Second left groove side, 44-2-Second right groove side, 45-1-Third left groove side, 45-2-Third right groove side, etc. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the invention described herein. Furthermore, terms such as "comprising" and "having" mean that in addition to those already listed in "comprising" and "having," other unlisted contents may also be included; for example, a process, method, system, product, or device may include a series of steps or units, not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0036] Due to the angle of the drawing, some parts may not be drawn, but their positions and connections can be understood from the text descriptions.

[0037] like Figure 1 As shown, this invention is a stealthy underwater detection optical cable, comprising a cable core 1, a protective sleeve around the outer periphery of the cable core 1, the protective sleeve being an integrally structured inner protective ring 2 and a deformable layer, the inner protective ring 2 being cylindrical, and the deformable layer being composed of annularly distributed deformable protrusions 3, the deformable protrusions 3 being spirally arranged around the outer periphery of the inner protective ring 2. The radial cross-sectional shape of the deformable protrusions 3 continuously changes.

[0038] like Figure 4 As shown, in this embodiment, the deformable protrusion 3 has a symmetrically arranged left side 3-1 and right side 3-2 on both sides of its radial cross-section, as shown in the figure. Figure 5 As shown, the left side 3-1 of the deformable protrusion is composed of the connected upper left side 3-11 and lower left side 3-12, and the right side 3-2 of the deformable protrusion is composed of the connected upper right side 3-21 and lower right side 3-22. The lower left side 3-12 and lower right side 3-22 are connected to the protective inner ring 2, and the ends of the upper left side 3-11 and upper right side 3-21 are connected. The lower left side 3-12 and lower right side 3-22 are fixed, while the lengths of the upper left side 3-11 and upper right side 3-21 change continuously, and the included angle α between the upper left side 3-11 and lower left side 3-12, and between the upper right side 3-21 and lower right side 3-22 changes continuously.

[0039] like Figure 2 As shown, the cable core 1 includes a protective layer 18, which contains a leaky optical cable 11, several power lines 12, several signal line groups 13, one or more optical fiber units 14, several components 15, and several sensors 16. The gaps inside the protective layer 18 are filled with sealing material 17.

[0040] The protective sleeve is made of polyurethane or polyolefin.

[0041] To enhance stealth capabilities, the deformable protrusions 3 are spirally oscillating around the outer periphery of the inner protective ring 2, meaning the direction and angle of the spiral are variable. Specifically, the deformable protrusions 3 are arranged in an SZ spiral pattern around the outer periphery of the inner protective ring 2. The oscillation deflection angle of the deformable protrusions 3 ranges from 90° to 360°.

[0042] The pitch range of the deformable protrusion 3 is 5 to 30 times the pitch diameter ratio.

[0043] A method for manufacturing a stealthy underwater detection optical cable includes the following steps: Step 1: Prepare cable core 1.

[0044] Step two: Perform straight-line pulling of the optical cable.

[0045] 1. Prepare mold components, such as Figure 6 As shown, the mold assembly consists of a concentrically arranged mold core 42, a first mold sleeve 43, a second mold sleeve 44, and a third mold sleeve 45. The mold core 42 is located at the center of the first mold sleeve 43, and the mold core 42 and the first mold sleeve 43 form a mold channel 41. The second mold sleeve 44 and the third mold sleeve 45 are sequentially arranged on the side of the first mold sleeve 43. The end of the first mold sleeve 43 is provided with a first mold through hole, and the inner wall of the first mold through hole is continuously provided with a first corner groove, such as... Figure 7 As shown, the first corner groove has a symmetrically arranged first left groove side 43-1 and first right groove side 43-2 on both sides. The second mold sleeve 44 has a second mold through hole in the middle, and the inner wall of the second mold through hole is continuously provided with second corner grooves, such as... Figure 8 As shown, the second corner groove has an asymmetrically arranged second left groove edge 44-1 and second right groove edge 44-2 on both sides. The third mold sleeve 45 has a third mold through hole in the middle, and the inner wall of the third mold through hole is continuously provided with third corner grooves, such as... Figure 9 As shown, the third corner groove has an asymmetrical arrangement of the third left groove side 45-1 and the third right groove side 45-2 on both sides.

[0046] 2. Cable core 1 is released from the pay-off reel, passes through the mold core 42 of the mold assembly, the first mold through hole, the second mold through hole, and the third mold through hole, and then passes through the cold water tank and is connected to the traction device. The traction device presses down the cooled and shaped optical cable and prevents the optical cable from twisting.

[0047] Step 3: Extrude a protective sleeve onto the outer periphery of cable core 1.

[0048] ①. Feeding of the protective sleeve. The high-temperature molten material of the protective sleeve is extruded into the die channel 41 in the rotating extruder head through the extruder, and wraps around the cable core 1.

[0049] ②. Initial extrusion. At the initial extrusion stage, such as... Figures 10-11 As shown, Figure 10 This is a schematic diagram of the initial state of the first mold sleeve 43, the second mold sleeve 44 and the third mold sleeve 45 overlapping into a whole. The first mold through hole of the first mold sleeve 43, the second mold through hole in the middle of the second mold sleeve 44 and the third mold through hole in the middle of the third mold sleeve 45 are the first mold through hole of the first mold sleeve 43 in the axial projection. Therefore, the left side 3-1 and the right side 3-2 of the extruded deformable protrusion 3 are the same as the first left groove side 43-1 and the first right groove side 43-2 of the first mold sleeve 43.

[0050] ③. Differential extrusion in the same direction using the first die sleeve 43, the second die sleeve 44, and the third die sleeve 45. First, the single, same-direction oscillation of the first die sleeve 43, the second die sleeve 44, and the third die sleeve 45 causes the deformable protrusions 3 to spirally wrap around the outer circumference of the cable core 1. Second, the first die sleeve 43, the second die sleeve 44, and the third die sleeve 45 rotate in the same direction, causing the deformable protrusions 3 on the outer side of the deformable layer to spirally wrap around the outer circumference of the cable core 1 in an SZ spiral pattern, while the inner protective ring 2 on the inner side of the deformable layer remains circular. It should be understood that if the first die sleeve 43, the second die sleeve 44, and the third die sleeve 45 rotate synchronously, the radial cross-section of the deformable protrusions 3 will remain unchanged. However, in this case, it is necessary to create a difference in the rotation speed of the first die sleeve 43, the second die sleeve 44, and the third die sleeve 45 to achieve the effect of continuous change in the radial cross-sectional shape of the deformable protrusions 3 and the included angle α. Taking the clockwise rotation of the first mold sleeve 43, the second mold sleeve 44, and the third mold sleeve 45 as an example, the rotational speed of the second mold sleeve 44 gradually decreases compared to the rotational speed of the first mold sleeve 43, while the rotational speed of the third mold sleeve 45 gradually increases compared to the rotational speed of the first mold sleeve 43. Figure 12 As shown, the second right groove edge 44-2 of the second mold sleeve 44 and the third left groove edge 45-1 of the third mold sleeve 45 gradually and symmetrically enter the axial projection of the first corner groove on the first mold sleeve 43. The portions of the second mold sleeve 44 and the third mold sleeve 45 that enter the axial projection of the first corner groove on the first mold sleeve 43 change the radial cross-sectional shape of the deformable protrusion 3. The portions of the second right groove edge 44-2 and the third left groove edge 45-1 that enter the axial projection of the first corner groove on the first mold sleeve 43 work together to create the upper right edge 3-21 and the upper left edge 3-11 of the deformable protrusion 3. Through the operation of the above mold assembly, the deformable protrusion 3 spirally wraps around the outer periphery of the cable core 1, while the radial cross-sectional shape and included angle α of the deformable protrusion 3 continuously change.

[0051] To ensure that the deformable protrusion 3 spirally wraps around the outer circumference of the cable core 1 while the radial cross-sectional shape and included angle α of the deformable protrusion 3 continuously change, the following steps are taken: Figure 13As shown, the first mold sleeve 43, the second mold sleeve 44, and the third mold sleeve 45 rotate counterclockwise. The rotational speed of the second mold sleeve 44 gradually increases to exceed that of the first mold sleeve 43, while the rotational speed of the third mold sleeve 45 gradually decreases to decrease that of the first mold sleeve 43. The second right groove edge 44-2 of the second mold sleeve 44 and the third left groove edge 45-1 of the third mold sleeve 45 gradually and symmetrically move away from the axial projection of the first corner groove on the first mold sleeve 43. The portions of the second mold sleeve 44 and the third mold sleeve 45 that move away from the axial projection of the first corner groove on the first mold sleeve 43 change the radial cross-sectional shape of the deformable protrusion 3 until the second right groove edge 44-2 and the third left groove edge 45-1 of the third mold sleeve 45 completely move away from the axial projection of the first corner groove on the first mold sleeve 43. The reciprocating unidirectional differential speed operation of the mold assembly causes the deformable protrusion 3 on the outer side of the deformable layer to be wound in an SZ spiral shape around the outer periphery of the cable core 1, while the radial cross-sectional shape and included angle α of the deformable protrusion 3 continuously change. The inner ring 2 has an annular cross-section, and the reciprocating unidirectional differential speed operation of the mold assembly does not affect it.

[0052] By reciprocating in the same direction with differential speed extrusion of the first mold sleeve 43, the second mold sleeve 44 and the third mold sleeve 45, the radial cross-sectional shape of the deformable protrusion 3 can be changed and it can be wound around the outer circumference of the cable core 1 in an SZ spiral form. The parameters such as the required SZ swing deflection angle and the speed difference of the three mold sleeves can be adjusted according to the working requirements.

[0053] The working process of this invention is as follows: The deformable protrusion 3 is superimposed with an SZ spiral shape that changes continuously in both the transverse and longitudinal directions, and an included angle α, so that the cable has a reflective surface with different reflection angles and areas for the probe wave.

[0054] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for manufacturing a stealthy underwater detection optical cable, the method being used to manufacture a stealthy underwater detection optical cable, the stealthy underwater detection optical cable comprising a cable core (1), a protective sleeve provided on the outer periphery of the cable core (1), the protective sleeve being an integral protective inner ring (2) and a deformation layer, the deformation layer being composed of annularly distributed deformation protrusions (3), the deformation protrusions (3) being spirally arranged on the outer periphery of the protective inner ring (2); the radial cross-sectional shape of the deformation protrusions (3) being continuously changing; the two sides of the radial cross-section of the deformation protrusions (3) being symmetrically arranged left side (3-1) and right side (3-2) of the deformation protrusions; the left side (3-1) of the deformation protrusions (3-2) being symmetrically arranged on both sides of the radial cross-section of the deformation protrusions (3-1) and right side (3-2); the left side (3-1) of the deformation protrusions (3-1) being symmetrically arranged on both sides of the radial cross-section ... 1) Composed of connected upper left side (3-11) and lower left side (3-12), the right side (3-2) of the deformable protrusion is composed of connected upper right side (3-21) and lower right side (3-22), the lower left side (3-12), the lower right side (3-22) are connected to the protective inner ring (2), and the ends of the upper left side (3-11) and the upper right side (3-21) are connected; the lengths of the upper left side (3-11) and the upper right side (3-21) change continuously, and the included angle α between the upper left side (3-11) and the lower left side (3-12), and between the upper right side (3-21) and the lower right side (3-22) changes continuously, characterized in that, The steps include the following: Step 1, prepare the cable core (1); Step two: Perform straight-line pulling of the optical cable; 1. Prepare the mold assembly, which consists of a mold core (42), a first mold sleeve (43), a second mold sleeve (44), and a third mold sleeve (45). The mold core (42) is located at the center of the first mold sleeve (43). The mold core (42) and the first mold sleeve (43) form a mold channel (41). The second mold sleeve (44) and the third mold sleeve (45) are arranged sequentially on the side of the first mold sleeve (43). The end of the first mold sleeve (43) is provided with a first mold through hole. The inner wall of the first mold through hole is continuously provided with a first corner groove. The two sides of the first corner groove are opposite to each other. The first left groove edge (43-1) and the first right groove edge (43-2) are provided; the second mold sleeve (44) has a second mold through hole in the middle, and the inner wall of the second mold through hole is continuously provided with a second corner groove, and the two sides of the second corner groove are asymmetrically provided with a second left groove edge (44-1) and a second right groove edge (44-2); the third mold sleeve (45) has a third mold through hole in the middle, and the inner wall of the third mold through hole is continuously provided with a third corner groove, and the two sides of the third corner groove are asymmetrically provided with a third left groove edge (45-1) and a third right groove edge (45-2).

2. The cable core (1) is released from the pay-off reel, passes through the mold core (42) of the mold assembly, the first mold through hole, the second mold through hole, the third mold through hole, and then passes through the cold water tank and is connected to the traction device. The traction device presses down the cooled and shaped optical cable and prevents the cable from twisting. Step 3: Extruding a protective sleeve on the outer periphery of the cable core (1); ①. Feeding of the protective sleeve; The high-temperature molten material of the protective sleeve is extruded into the die channel (41) in the rotating extruder head through the extruder and wrapped around the cable core (1); ②. Initial extrusion; At the initial extrusion position, the first mold through hole of the first mold sleeve (43), the second mold through hole in the middle of the second mold sleeve (44), and the third mold through hole in the middle of the third mold sleeve (45) are the first mold through hole of the first mold sleeve (43) in the axial projection of the hollow part; ③. The first mold sleeve (43), the second mold sleeve (44) and the third mold sleeve (45) are extruded in the same direction at different speeds; Step 3, ③. The first mold sleeve (43), the second mold sleeve (44) and the third mold sleeve (45) rotate clockwise. The rotation speed of the second mold sleeve (44) gradually becomes less than that of the first mold sleeve (43), and the rotation speed of the third mold sleeve (45) gradually becomes greater than that of the first mold sleeve (43). The second right groove edge (44-2) of the second mold sleeve (44) and the third left groove edge (45-1) of the third mold sleeve (45) gradually and symmetrically enter the axial projection of the first corner groove on the first mold sleeve (43). The parts of the second mold sleeve (44) and the third mold sleeve (45) that enter the axial projection of the first corner groove on the first mold sleeve (43) are also included.

2. The method for manufacturing a stealthy underwater detection optical cable as described in claim 1, characterized in that, Step 3, ③. The first mold sleeve (43), the second mold sleeve (44) and the third mold sleeve (45) reciprocate in the same direction with differential speed extrusion.

3. The method for manufacturing a stealthy underwater detection optical cable as described in claim 1, characterized in that, The cable core (1) includes a protective layer (18), which contains a leaky optical cable (11), several power lines (12), several signal line groups (13), one or more optical fiber units (14), several components (15), and several sensors (16). The gaps inside the protective layer (18) are filled with sealing material (17).

4. The method for manufacturing a stealthy underwater detection optical cable as described in claim 1, characterized in that, The protective sleeve is made of polyurethane or polyolefin.

5. The method for manufacturing a stealthy underwater detection optical cable as described in claim 1, characterized in that, The deformable protrusions (3) are arranged in an SZ spiral pattern on the outer periphery of the inner protective ring (2); the swing deflection angle of the deformable protrusions (3) is 90°~360°; the pitch range of the deformable protrusions (3) is 5~30 times the pitch ratio.

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