A high-sensitivity optical fiber hydrophone element resistant to high hydrostatic pressure

Abstract

The present invention discloses a high-sensitivity fiber-optic hydrophone element resistant to high hydrostatic pressure, including a sensitizing elastic component, an element packaging component, an optical fiber and a flexible coating layer; the element packaging component is used to cover both ends of the sensitizing elastic component; the side of the sensitizing elastic component is surrounded by an optical fiber and covered with a flexible coating layer to realize the packaging of the sensitizing elastic component. Among them, the sensitizing elastic component is made of a composite of two materials with different Young's modulus, wherein the material with a larger Young's modulus is used as a skeleton material, which has a high strength-to-weight ratio and exhibits excellent resistance and fatigue performance to radial compression loads. The gap of the skeleton is filled with a flexible filling material with a smaller Young's modulus, which can ensure that the sensitizing elastic component still maintains an ideal equivalent Young's modulus under a larger hydrostatic pressure. In a high hydrostatic pressure environment, the sound pressure converts the radial deformation of the pressure-resistant material into the axial deformation of the optical fiber, and then into the phase change of the light wave, and the high-sensitivity perception of the sound pressure is achieved through demodulation.

Description

Technical Field

[0001] The invention relates to the technical field of underwater acoustic sensing, in particular to a high-sensitivity optical fiber hydrophone element capable of withstanding high hydrostatic pressure. Background Art

[0002] Fiber optic hydrophones extract acoustic signals based on demodulating changes in optical signals in optical fibers, such as phase, intensity or wavelength. They are mainly used to study sound propagation characteristics, noise, reverberation, target acoustic characteristics, etc. in marine acoustic environments. They have the advantages of high sensitivity to sound pressure, resistance to electromagnetic interference, and a large dynamic range. Due to the large Young's modulus of the optical fiber itself, its axial deformation is very small when disturbed, and the sensitivity of sensing using optical fiber alone is not high. In order to improve the sensitivity of fiber optic hydrophones, it is often necessary to perform sensitivity enhancement on the optical fiber. The basic method is to attach or wind the optical fiber on a certain elastic body to form a hydrophone element. When sound waves act on such elements, the elastic body will be deformed, which in turn stretches the optical fiber, causing changes in the internal optical signal, which has a sensitivity enhancement effect.

[0003] In order to obtain high sensitivity (such as -140dB / rad / μPa), softer materials (low elastic modulus) are often used for elastomers. Due to high hydrostatic pressure in deep-sea conditions, such sensitizing materials will harden, that is, their stress-strain curve changes sharply with pressure, causing the sensitivity of the hydrophone element to be greatly reduced. In order to meet the needs of deep-sea applications for highly sensitive fiber-optic hydrophones, it is necessary to design the hydrophone element to withstand pressure. At present, there are two main methods: 1) Make a set of sealed shells for pressure resistance on the outside of the sensor to ensure that the hydrophone element inside is not affected by hydrostatic pressure. For example, the patent "A high-pressure resistant deep-sea seaphone" (application number 202020589276.9) proposes a high-pressure resistant deep-sea seaphone, which is characterized in that the outer surfaces of the hydrophone body are respectively provided with a left semicircular iron shell and a right semicircular iron shell to form a closed chamber to protect the hydrophone element inside. In the above method, the metal shell will affect the sound transmission performance and increase the overall size of the hydrophone to a certain extent. 2) Use hard materials (high elastic modulus) to form an air cavity to form a pressure-bearing structure. For example, the patent "A fiber-optic hydrophone for deep sea use" (application number 201711447729.3) has a large overall stiffness and a limited sensitivity enhancement effect per unit length of optical fiber. Therefore, it is often necessary to wind tens to hundreds of meters of optical fiber to accumulate sufficient phase changes in order to improve the sensitivity of the element. This type of design and assembly is relatively complex, and the length of a single element fiber is long. Traditional interference hydrophones can still be used. For new distributed fiber-optic hydrophones, which are limited by the demodulation spatial resolution, too long optical fiber will greatly increase the overall fiber length of the optical cable, thereby affecting the overall performance of the system. Therefore, how to achieve the design and preparation of high-sensitivity hydrophone elements similar to those under normal pressure is a technical challenge faced by fiber-optic hydrophones in deep-sea exploration applications. Summary of the invention

[0004] The present application provides a high-sensitivity hydrophone element that is resistant to high hydrostatic pressure, the purpose of which is to solve the problems of reduced detection sensitivity of existing fiber optic hydrophones under high hydrostatic pressure conditions in the deep sea, and bulky and large sensors.

[0005] To solve the above problems, the technical solutions proposed by the present invention are as follows:

[0006] A high-sensitivity fiber-optic hydrophone element resistant to high hydrostatic pressure comprises a sensitivity-enhancing elastic component, an element packaging component, an optical fiber and a flexible coating layer; the element packaging component is used to cover both ends of the sensitivity-enhancing elastic component; the side of the sensitivity-enhancing elastic component is surrounded by an optical fiber and covered with a flexible coating layer to achieve the packaging of the sensitivity-enhancing elastic component.

[0007] Furthermore, it also includes soft glue, and the two ends of the sensitivity-enhancing elastic component are tightly attached to the soft glue, and then the two ends of the sensitivity-enhancing elastic component are covered by the elementary packaging component.

[0008] Furthermore, the elementary packaging component includes an end cover, a center rod and a nut; the center rod includes a head and a rod portion; the rod portion of the center rod is sequentially covered with the sensitivity-enhancing elastic component and the end cover, and the end cover is then pressed by the nut.

[0009] Furthermore, the rod portion includes a first section rod, a second section rod and a third section rod;

[0010] The first section of the rod is covered with the primitive packaging component; the second section of the rod is covered with the end cap and is in close contact with the primitive packaging component. If soft glue is provided at both ends of the primitive packaging component, the end cap is in close contact with the soft glue; the nut is screwed on the third section of the rod to compress the end cap;

[0011] A sealing ring is also provided at the second section of the rod.

[0012] Further, the primitive packaging assembly includes two end covers, a support tube, bolts and nuts;

[0013] The supporting tube sleeve has two end covers and a sensitivity-enhancing elastic component. The two end covers are respectively located at the two ends of the sensitivity-enhancing elastic component and are tightly attached. If soft glue is respectively provided at the two ends of the elementary packaging component, the two end covers are respectively tightly attached to the soft glue. Finally, the end covers at both ends are tightened by bolts and nuts.

[0014] Furthermore, the sensitizing elastic component includes a skeleton material model and a filling material model, which complement each other to form the sensitizing elastic component. The skeleton material model and the filling material model are separated from each other but interlocked with each other to form two phase regions, both of which are continuous phases and are in a connected state in all directions in space.

[0015] The skeleton material model is made of a material with a larger Young's modulus of 1-5Gpa to withstand high hydrostatic stress; the filling material model is made of a soft material with a smaller Young's modulus of 10-100Mpa to provide a wide range of linear deformation capabilities, while playing a filling and bonding role, and assisting in balancing and dispersing the load.

[0016] Furthermore, the method for constructing the skeleton material model and the filling material model includes: designing and constructing a cell of a crystal-like structure through modeling software, constructing the cell into a lattice structure, the envelope of which is cylindrical, and the lattice structure is the skeleton material model; the model obtained by performing a Boolean subtraction operation on the cylindrical contour model of the sensitizing elastic component and the skeleton material model is the filling material model.

[0017] Furthermore, the pitch of the optical fiber wrapped around the sensitivity-enhancing elastic component is greater than the diameter of the optical fiber.

[0018] Furthermore, the flexible covering layer is specifically made of a flexible sound-permeable material, wrapped around the outside of the optical fiber to isolate the optical fiber from the external medium, ensure the effective fit between the optical fiber and the sensitizing elastic component, and play a sealing role.

[0019] Furthermore, it also includes: the high-sensitivity optical fiber hydrophone elements are connected to each other and assembled into an array.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. Through the design and preparation of composite sensitization elastic components, combined with the design of elementary packaging components, clamping components and flexible coating layers, the fiber optic hydrophone still has high sensitivity under high hydrostatic pressure.

[0022] 2. No need for complicated internal and external pressure balance or pressure isolation shell design, the overall structure is simple and easy to assemble, which makes it easy to miniaturize the high hydrostatic pressure resistant hydrophone. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0024] Figure 1 It is a schematic diagram of the structure of a high-sensitivity optical fiber hydrophone element resistant to high hydrostatic pressure provided by an embodiment of the present invention;

[0025] Figure 2is a schematic diagram of a central rod structure provided by an embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of another high-sensitivity optical fiber hydrophone element resistant to high hydrostatic pressure provided by an embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of a sensitivity-enhancing elastic component of a high-sensitivity optical fiber hydrophone element resistant to high hydrostatic pressure provided by an embodiment of the present invention;

[0028] Figure 5 It is a schematic diagram of a unit cell lattice structure skeleton material model in a sensitivity-enhancing elastic component of a high-sensitivity optical fiber hydrophone element resistant to high hydrostatic pressure provided by an embodiment of the present invention;

[0029] Figure 6 It is a schematic diagram of a model of a unit cell lattice structure filling material in a sensitizing elastic component of a high-sensitivity optical fiber hydrophone element resistant to high hydrostatic pressure provided by an embodiment of the present invention.

[0030] Reference numerals:

[0031] 110. Sensitization elastic component; 111. Skeleton material model; 112. Filling material model; 120. Elementary packaging component; 121. End cover; 122. Center rod; 1221. Head; 1222. Rod; 1223. First section of rod; 1224. Second section of rod; 1225. Third section of rod; 123. Nut; 124. Sealing ring; 125. Soft glue; 126 Support tube; 130. Optical fiber; 140. Flexible coating; 150. Clamping component. DETAILED DESCRIPTION

[0032] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0033] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0034] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0035] The present invention discloses a high-sensitivity fiber-optic hydrophone element that is resistant to high hydrostatic pressure, comprising a sensitivity-enhancing elastic component 110, an element packaging component 120, an optical fiber 130 and a flexible coating layer 140; the element packaging component 120 is used to cover both ends of the sensitivity-enhancing elastic component 110; the side of the sensitivity-enhancing elastic component 110 is surrounded by the optical fiber 130 and covered with a flexible coating layer 140, thereby realizing the packaging of the sensitivity-enhancing elastic component 110.

[0036] In one embodiment, soft glue 125 is further included, and both ends of the sensitivity-enhancing elastic component 110 are tightly attached to the soft glue 125 , and then the two ends of the sensitivity-enhancing elastic component 110 are covered by the elementary packaging component 120 .

[0037] In one embodiment, if Figure 1 As shown, the elementary packaging component 120 includes an end cover 121, a center rod 122 and a nut 123; the center rod 122 includes a head 1221 and a rod portion 1222; the rod portion 1222 of the center rod 122 is sequentially covered with the sensitivity-enhancing elastic component 110 and the end cover 121, and then the end cover 121 is pressed by the nut 123.

[0038] In one embodiment, if Figure 2 As shown, the rod portion 1222 includes a first rod section 1223, a second rod section 1224 and a third rod section 1225, and the diameters of the three rod sections decrease in sequence; the first rod section 1223 is covered with the primitive packaging component 120; the second rod section 1224 is covered with the end cap 121 and is closely attached to the primitive packaging component 120; see Figure 1If soft glue 125 is also provided at both ends of the elementary packaging component 120, the end cap 121 is in close contact with the soft glue 125; wherein, the end cap 121 and the center rod 122 have good axial rigidity, the step between the first section rod 1223 and the second section rod 1224 limits the end cap 121 in the axial direction, and the nut 123 is screwed on the third section rod 1225 to compress the end cap 121, so that the two end faces of the sensitive elastic component 110 are sealed, ensuring that the two ends of the sensitive elastic component 110 will not be subjected to hydrostatic pressure; and the radial pressure of the hydrostatic pressure can act on the cylindrical surface of the sensitive elastic component 110, causing radial strain on the side of the sensitive elastic component 110. A sealing ring 124 is also provided at the second section rod 1224 to prevent water pressure from entering the interior of the hydrophone elementary.

[0039] See also Figure 1 The diameter of the first section rod 1223 is equal to the inner diameter of the primitive packaging component 120, the third inner diameter of the head 1221 of the center rod 122 is greater than or equal to the outer diameter of the primitive packaging component 120, the second inner diameter of the end cap 121 is greater than or equal to the outer diameter of the primitive packaging component 120, and the diameter of the second section rod 1224 is less than or equal to the first inner diameter of the end cap 121; the outside of the sensitizing elastic component 110 and the area between the center rod 122 and the end cap 121 are filled and covered by the flexible coating 140, and the optical fiber 130 is located inside the flexible coating 140.

[0040] In one embodiment, if Figure 3 As shown, the elementary packaging component 120 includes two end covers 121, a support tube 126, bolts and nuts; the support tube 126 is covered with two end covers 121 and a sensitivity-enhancing elastic component 110, and the two end covers 121 are respectively located at both ends of the sensitivity-enhancing elastic component 110 and are tightly attached. If soft glue 125 is respectively provided at both ends of the elementary packaging component 120, the two end covers 121 are respectively tightly attached to the soft glue 125; finally, the end covers 121 at both ends are pressed by bolts and nuts. Among them, the end covers 121, the support tube 126 and the bolts have good axial stiffness. Under the fixing action of the bolts, the support tube 126 and the nuts, the two end faces of the sensitivity-enhancing elastic component 110 are sealed to ensure that the two ends of the sensitivity-enhancing elastic component 110 will not be subjected to hydrostatic pressure; and the radial pressure of the hydrostatic pressure can act on the cylindrical surface of the sensitivity-enhancing elastic component 110, causing radial strain on the side of the sensitivity-enhancing elastic component 110.

[0041] The first inner diameter of the end cap 121 is equal to the outer diameter of the support tube 126, the second inner diameter of the end cap 121 is greater than or equal to the outer diameter of the sensitivity-enhancing elastic component 110, the inner diameter of the sensitivity-enhancing elastic component 110 is equal to the outer diameter of the support tube 126, the bolt head diameter and the nut diameter are both greater than the first inner diameter of the end cap 121, and the bolt screw diameter is less than or equal to the inner diameter of the support tube 126; the bolt screw passes through the support tube 126, and then the end caps 121 at both ends are tightened by tightening the nut; the gap between the support tube 126 and the screw can be air, or filled with water or other substances, and does not affect the operation of the high-sensitivity optical fiber hydrophone element.

[0042] In one embodiment, the preparation method of the sensitizing elastic component 110 is as follows: 1. Design and construct a cell of a crystal-like structure through modeling software, and construct the cell into a lattice structure, the envelope of which is cylindrical, such as Figure 5 As shown, the lattice structure is called the skeleton material model 111; 2. The model obtained by performing Boolean subtraction operation on the cylindrical contour model of the required sensitization elastic material and the skeleton material model 111 of the lattice structure is called the filling material model 112, as shown Figure 6 As shown, the filling material model 112 and the skeleton material model 111 are both continuous porous models, and the envelope of their contours is also cylindrical; 3. Perform Boolean addition operation on the skeleton material model 111 and the filling material model 112 to obtain the structural model of the sensitized elastic material, that is, the sensitized elastic component 110, as shown Figure 4 As shown, the skeleton material model 111 and the filling material model 112 are both continuous models, and the two complement each other to form the structural model of the sensitized elastic material. The two material models are separated from each other but interlocked into two phase regions, both of which are continuous phases and are connected in all directions in space.

[0043] Secondly, the structural model of the sensitized elastic material is printed out using multi-material additive manufacturing technology. Among them, the skeleton material model 111 is made of a material with a large Young's modulus of 1-5GPa, such as PLA, ABS, PETG, etc., as a reinforcing phase in the composite material, mainly playing the role of supporting the structure and being able to withstand high hydrostatic stress; the filling material model 111 is made of a soft material with a small Young's modulus of 10-100MPa, such as silicone rubber material, as a matrix phase in the composite material, providing a wide range of linear deformation capabilities, while playing a filling and bonding role, and assisting in balancing and dispersing the load.

[0044] Specifically, when hydrostatic pressure acts on the outside of the high-sensitivity optical fiber hydrophone element, the sensitizing elastic component 110 is compressed radially, but due to the lattice bicontinuous composite material structure of the sensitizing elastic component 110, its stress-strain curve remains linear, and its equivalent Young's modulus does not change with the increase of hydrostatic pressure, that is, the sensitization performance of the sensitizing elastic component 110 is not affected by the hydrostatic pressure. At this time, when the sound wave acts on the sensitizing elastic component 110, it will cause the deformation of the sensitizing elastic component 110, and then stretch the optical fiber 130, causing the change of the optical signal inside the optical fiber 130, which has the effect of sensitization.

[0045] In one embodiment, the optical fiber 130 is densely wound with a certain length L on the outer surface of the sensitizing elastic component 110 to form a fiber ring. The optical fiber 130 uses bend-resistant optical fiber, which can be in the form of bare fiber or tight-packed optical fiber. A single layer is tightly spirally wound on the outer surface of the sensitizing elastic component 110, and the pitch range is: greater than the diameter of the optical fiber and less than 2 times the diameter of the sensitizing elastic component 110 to ensure the sensitivity of the unit length element.

[0046] In one embodiment, a clamping assembly 150 is provided at both ends of the hydrophone element, which is used to clamp and fix the hydrophone element and also to assemble the element into an array. Different clamping structures can be designed according to different hydrophone array types. Preferably, a clamping assembly with a flexible connection such as a tension spring or a rubber band is used, which has a simple structure and can reduce the influence of low-frequency vibration. Specifically, Figure 1 As shown, four clamping assemblies 150 are provided, two clamping assemblies 150 are symmetrically fixed on the outer side of the end cover 121, and two clamping assemblies 150 are also symmetrically fixed on the outer side of the center rod 122; Figure 3 As shown, two clamping assemblies 150 are symmetrically fixed on the outside of each end cover 121; the number of clamping assemblies in this embodiment is not limited, and other numbers can be set according to actual scenarios; the material and form of the clamping assemblies are also not limited, and different flexible materials and structures can be used according to vibration isolation and load-bearing requirements.

[0047] In one embodiment, the outer cylindrical surface of the optical fiber ring is vulcanized to form a flexible coating layer 140, which may also be referred to as a vulcanization layer in this embodiment. The vulcanization layer is made of sound-transmitting vulcanized rubber and is wrapped around the outside of the optical fiber ring to isolate the optical fiber ring from the external medium. After the vulcanization layer is cured, it can ensure the effective fit between the optical fiber ring and the sensitizing elastic component 110, prevent the optical fiber ring from being separated from the sensitizing elastic component 110 due to excessive external water pressure, and play a watertight role, thereby ensuring the accuracy of the sensitivity of the acoustic sensitive element. In some embodiments, it can also be made of flexible sound-transmitting materials such as TPU, which will not be described here one by one.

[0048] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the contents disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in the present application.

[0049] It should be understood that the present application is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof.

Claims

1. A high-sensitivity optical fiber hydrophone element resistant to high hydrostatic pressure, characterized in that: The invention comprises a sensitivity-enhancing elastic component (110), a primitive packaging component (120), an optical fiber (130) and a flexible coating layer (140); the primitive packaging component (120) is used to cover both ends of the sensitivity-enhancing elastic component (110); the side of the sensitivity-enhancing elastic component (110) is surrounded by the optical fiber (130) and covered with a layer of flexible coating layer (140), thereby achieving the packaging of the sensitivity-enhancing elastic component (110); The sensitizing elastic component (110) includes a skeleton material model (111) and a filling material model (112), which complement each other to form the sensitizing elastic component (110), wherein the skeleton material model (111) and the filling material model (112) are separated from each other but interlocked with each other to form two phase regions, both of which are continuous phases and are in a connected state in all directions in space; The skeleton material model (111) is made of a material with a relatively large Young's modulus of 1-5 Gpa to withstand high hydrostatic stress; the filling material model (112) is made of a soft material with a relatively small Young's modulus of 10-100 Mpa to provide a wide range of linear deformation capability, while playing a filling and bonding role, and assisting in balancing and dispersing the load.

2. A high-sensitivity optical fiber hydrophone element resistant to high hydrostatic pressure according to claim 1, characterized in that: It also includes soft glue (125), and the two ends of the sensitivity-enhancing elastic component (110) are tightly attached to the soft glue (125), and then the two ends of the sensitivity-enhancing elastic component (110) are covered by the elementary packaging component (120).

3. A high-sensitivity optical fiber hydrophone element resistant to high hydrostatic pressure according to claim 1, characterized in that: The elementary packaging component (120) comprises an end cover (121), a center rod (122) and a nut (123); the center rod (122) comprises a head (1221) and a rod portion (1222); the rod portion (1222) of the center rod (122) is sequentially sleeved with the sensitivity-enhancing elastic component (110) and the end cover (121), and the end cover (121) is then pressed by the nut (123).

4. A high-sensitivity optical fiber hydrophone element resistant to high hydrostatic pressure according to claim 3, characterized in that: The rod portion (1222) comprises a first rod section (1223), a second rod section (1224) and a third rod section (1225); The first section of the rod (1223) is sleeved with the primitive packaging component (120); the second section of the rod (1224) is sleeved with the end cap (121) and is in close contact with the primitive packaging component (120); if soft glue (125) is provided at both ends of the primitive packaging component (120), the end cap (121) is in close contact with the soft glue (125); the third section of the rod (1225) is screwed with the nut (123) to press the end cap (121); A sealing ring (124) is also provided at the second section rod (1224).

5. The high-sensitivity optical fiber hydrophone element capable of withstanding high hydrostatic pressure according to claim 1, characterized in that: The elementary packaging assembly (120) comprises two end covers (121), a support tube (126), bolts and nuts; The support tube (126) is sleeved with two end covers (121) and a sensitivity-enhancing elastic component (110), and the two end covers (121) are respectively located at the two ends of the sensitivity-enhancing elastic component (110) and are tightly attached. If soft glue (125) is respectively provided at the two ends of the elementary packaging component (120), the two end covers (121) are respectively tightly attached to the soft glue (125); finally, the end covers (121) at the two ends are pressed tightly by bolts and nuts.

6. A high-sensitivity optical fiber hydrophone element capable of withstanding high hydrostatic pressure according to claim 1, characterized in that: The method for constructing the skeleton material model (111) and the filling material model (112) comprises: designing and constructing a cell of a crystal-like structure through modeling software, constructing the cell into a lattice structure, the envelope of which is cylindrical, and the lattice structure is the skeleton material model (111); performing a Boolean subtraction operation on the cylindrical contour model of the sensitizing elastic component (110) and the skeleton material model (111), and obtaining a model which is the filling material model (112).

7. The high-sensitivity optical fiber hydrophone element capable of withstanding high hydrostatic pressure according to claim 1, characterized in that: The pitch of the optical fiber (130) wrapped around the sensitivity-enhancing elastic component (110) is greater than the diameter of the optical fiber (130).

8. The high-sensitivity optical fiber hydrophone element capable of withstanding high hydrostatic pressure according to claim 1, characterized in that: The flexible covering layer (140) is specifically made of a flexible sound-permeable material and wrapped around the outside of the optical fiber (130) to isolate the optical fiber (130) from the external medium, ensure the effective fit between the optical fiber (130) and the sensitivity-enhancing elastic component (110), and play a sealing role.

9. The high-sensitivity optical fiber hydrophone element capable of withstanding high hydrostatic pressure according to claim 1, characterized in that: Also includes: It also includes a plurality of clamping components (150) arranged at two ends of the high-sensitivity optical fiber hydrophone element; The high-sensitivity optical fiber hydrophone elements are interconnected and assembled into an array.

Images