Fiber optic hydrophone and manufacturing method thereof

Abstract

An embodiment of the present invention discloses a fiber optic hydrophone and a manufacturing method thereof, which comprises assembling an inner skeleton and an outer skeleton into one body; fixing a portion of a first fiber reserved section located at a first end of the inner skeleton and a portion of a second fiber reserved section located at a first end of the outer skeleton in parallel with each other in a first fiber paralleling groove, and fixing a portion of the first fiber reserved section located at a second end of the outer skeleton and a portion of the second fiber reserved section located at a second end of the outer skeleton in parallel with each other in a second fiber paralleling groove; making a fiber optic coupler by using the remaining first fiber reserved section and the remaining second fiber reserved section located at the first end of the inner skeleton; passing an end portion of the first fiber optic located at the first end of the inner skeleton and an end portion of the second fiber optic located at a gap between the inner skeleton and the outer skeleton so that the fiber optic coupler is located in the gap and is encapsulated without a metal protective tube, thereby improving the axial symmetry of the fiber optic hydrophone, reducing the difficulty in achieving the acceleration resistance performance of the fiber optic hydrophone, and facilitating the miniaturization of the fiber optic hydrophone.

Description

Technical Field

[0001] The present invention relates to the field of measuring equipment, and in particular to a fiber optic hydrophone and a manufacturing method thereof. Background Art

[0002] Fiber-optic hydrophones are highly sensitive sound pressure sensors used in sonar systems. Due to their corrosion resistance, lack of power supply, multi-parameter capability, ease of large-scale networking, ability to implement long-distance real-time monitoring, and all-weather operation, they have gradually replaced traditional piezoelectric underwater acoustic sensing systems and are widely used in marine exploration. However, existing fiber-optic hydrophones use a metal encapsulation system within their fiber couplers, which severely impacts their axial symmetry. Summary of the Invention

[0003] In view of this, an embodiment of the present invention provides a fiber optic hydrophone and a manufacturing method thereof to solve the problem that the fiber optic coupler of the existing fiber optic hydrophone is encapsulated in a frame by metal, which seriously affects the axial symmetry of the fiber optic hydrophone.

[0004] In a first aspect, an embodiment of the present invention provides a method for manufacturing a fiber optic hydrophone, comprising:

[0005] cutting a first optical fiber of a first preset length and a second optical fiber of a second preset length;

[0006] Winding the first optical fiber around the outer periphery of the inner skeleton and forming first optical fiber reserved sections at the first end and the second end of the inner skeleton, and winding the second optical fiber around the outer periphery of the outer skeleton and forming second optical fiber reserved sections at the first end and the second end of the outer skeleton;

[0007] Assembling an inner frame wound with a first optical fiber and an outer frame wound with a second optical fiber into one body, with a gap provided between the inner frame and the outer frame;

[0008] Part of the first optical fiber reserved section at the first end of the inner skeleton and part of the second optical fiber reserved section at the first end of the outer skeleton are fixed in a first fiber paralleling groove, and part of the first optical fiber reserved section at the second end of the outer skeleton and part of the second optical fiber reserved section at the second end of the outer skeleton are fixed in a second fiber paralleling groove;

[0009] A fiber coupler is fabricated using the remaining first fiber reserved segment and the remaining second fiber reserved segment at the first end of the inner skeleton, and a light reflective film is plated on the remaining first fiber reserved segment and the remaining second fiber reserved segment at the second end of the inner skeleton or a Faraday rotator is fabricated;

[0010] The end of the first optical fiber and the end of the second optical fiber located at the first end of the inner skeleton are passed through the gap between the inner skeleton and the outer skeleton, so that the optical fiber coupler is located in the gap.

[0011] Optionally, the step of winding the first optical fiber around the outer periphery of the inner skeleton and forming first optical fiber reserved sections at the first end and the second end of the inner skeleton, and the step of winding the second optical fiber around the outer periphery of the outer skeleton and forming second optical fiber reserved sections at the first end and the second end of the outer skeleton, comprises:

[0012] Winding the first optical fiber and the second optical fiber on two fiber winding drums respectively;

[0013] Marking the midpoints of the first optical fiber and the second optical fiber;

[0014] Using a ring winding machine, align the midpoint of the first optical fiber with the midpoint of the first fiber slot, and align the midpoint of the second optical fiber with the midpoint of the second fiber slot, wherein the first fiber slot is located in the middle of the inner frame, and the second fiber slot is located in the middle of the outer frame;

[0015] Using a ring winding machine, the first optical fiber is wound along a first winding direction from the midpoint of the first fiber passing groove to the first end of the inner skeleton, and along a second winding direction from the midpoint of the first fiber passing groove to the second end of the inner skeleton, and a first optical fiber reserved section is formed at the first end and the second end of the inner skeleton, wherein the first winding direction is opposite to the second winding direction;

[0016] Using a ring winding machine, the second optical fiber is wound along the first winding direction from the midpoint of the second fiber slot toward the first end of the exoskeleton, and along the second winding direction from the midpoint of the second fiber slot toward the second end of the exoskeleton, and a second optical fiber reserved section is formed at the first end and the second end of the exoskeleton;

[0017] The wound first optical fiber and the second optical fiber are cured using an ultraviolet curing lamp.

[0018] Optionally, when the remaining first optical fiber reserved segment and the remaining second optical fiber reserved segment at the second end of the inner skeleton are coated with a light-reflecting film, the end of the first optical fiber and the end of the second optical fiber at the first end of the inner skeleton pass through the gap between the inner skeleton and the outer skeleton, so that the optical fiber coupler is located in the gap, comprising:

[0019] The end of the first optical fiber and the end of the second optical fiber located at the first end of the inner skeleton are passed through the first fiber through hole and the second fiber through hole in sequence, and glued at the first fiber through hole and the second fiber through hole. The first fiber through hole is set on the first fiber parallel groove, and the second fiber through hole is set on the second fiber parallel groove, and the positions of the first fiber through hole and the second fiber through hole correspond to each other.

[0020] Optionally, when a Faraday rotator is fabricated using the remaining first optical fiber reserved segment at the second end of the inner skeleton and the remaining second optical fiber reserved segment at the second end of the outer skeleton, the end of the first optical fiber and the end of the second optical fiber at the first end of the inner skeleton pass through a gap between the inner skeleton and the outer skeleton so that the optical fiber coupler is located within the gap, comprising:

[0021] Pass the end of the first optical fiber and the end of the second optical fiber located at the first end of the inner skeleton through the first fiber hole, the second fiber hole, the third fiber hole and the fourth fiber hole in sequence, and glue them at the first fiber hole, the second fiber hole, the third fiber hole and the fourth fiber hole, wherein the first fiber hole and the fourth fiber hole are arranged on the first parallel fiber slot, the second fiber hole and the third fiber hole are arranged on the second parallel fiber slot, and the position of the first fiber hole corresponds to the position of the second fiber hole, and the position of the fourth fiber hole corresponds to the position of the third fiber hole;

[0022] The Faraday rotator is placed in the Faraday rotator receiving device, and the Faraday rotator receiving device is arranged at the second ends of the inner frame and the outer frame.

[0023] In a second aspect, an embodiment of the present invention provides a fiber optic hydrophone, comprising an inner frame and an outer frame;

[0024] The outer frame is sleeved on the outer portion of the inner frame, and a gap is provided between the outer frame and the inner frame;

[0025] A first optical fiber is wound around the inner frame and a first optical fiber reserved section is formed at the first end and the second end of the inner frame respectively; a second optical fiber is wound around the outer frame and a second optical fiber reserved section is formed at the first end and the second end of the outer frame respectively;

[0026] A first limiting boss is provided on a portion of the inner frame near the first end, a second limiting boss is provided on a portion of the inner frame near the second end, a third limiting boss is provided on the first end of the outer frame, and a fourth limiting boss is provided on the second end of the outer frame. The first limiting boss and the third limiting boss form a first fiber paralleling groove, and the second limiting boss and the fourth limiting boss form a second fiber paralleling groove.

[0027] Part of the first optical fiber reserved section at the first end of the inner skeleton and part of the second optical fiber reserved section at the first end of the outer skeleton are fixed in parallel in the first fiber paralleling groove, and part of the first optical fiber reserved section at the second end of the outer skeleton and part of the second optical fiber reserved section at the second end of the outer skeleton are fixed in parallel in the second fiber paralleling groove;

[0028] The remaining first optical fiber reserved segment and the remaining second optical fiber reserved segment located at the first end of the inner skeleton are made into an optical fiber coupler, and the remaining first optical fiber reserved segment and the remaining second optical fiber reserved segment located at the second end of the inner skeleton are provided with a light reflecting film or a Faraday rotator; the optical fiber coupler is located in the gap.

[0029] Optionally, a first fiber-passing boss is provided in the middle of the inner frame, and a first fiber-passing groove is provided on the first fiber-passing boss; a second fiber-passing boss is provided in the middle of the outer frame, and a second fiber-passing groove is provided on the second fiber-passing boss;

[0030] The midpoint of the first optical fiber is located at the midpoint of the first fiber-passing groove, and the midpoint of the second optical fiber is located at the midpoint of the second fiber-passing groove. The first optical fiber is wound from the midpoint of the first fiber-passing groove to the first end of the inner skeleton along a first winding direction and from the midpoint of the first fiber-passing groove to the second end of the inner skeleton along a second winding direction, and a first optical fiber reserved section is formed at the first end and the second end of the inner skeleton.

[0031] The second optical fiber is wound from the midpoint of the second fiber groove to the first end of the outer skeleton along the first winding direction and is wound from the midpoint of the second fiber groove to the second end of the outer skeleton along the second winding direction, and a second optical fiber reserved section is formed at the first end and the second end of the outer skeleton. The first winding direction is opposite to the second winding direction.

[0032] Optionally, when the remaining first optical fiber reserved section and the remaining second optical fiber reserved section located at the second end of the inner skeleton are provided with a light reflective film, a first fiber through-hole is provided on the first fiber paralleling slot, a second fiber through-hole is provided on the second fiber paralleling slot, and the positions of the first fiber through-hole and the second fiber through-hole correspond to each other;

[0033] The end of the first optical fiber and the end of the second optical fiber located at the first end of the inner frame pass through the first fiber hole and the second fiber hole in sequence and are glued at the first fiber hole and the second fiber hole.

[0034] Optionally, when the remaining first optical fiber reserved section and the remaining second optical fiber reserved section located at the second end of the inner skeleton are provided with a Faraday rotator, the first fiber paralleling slot is provided with a first fiber through-hole and a fourth fiber through-hole, and the second fiber paralleling slot is provided with a second fiber through-hole and a third fiber through-hole, and the first fiber through-hole corresponds to the second fiber through-hole in position, and the fourth fiber through-hole corresponds to the third fiber through-hole in position;

[0035] Pass the end of the first optical fiber and the end of the second optical fiber located at the first end of the inner skeleton through the first fiber hole, the second fiber hole, the third fiber hole and the fourth fiber hole in sequence, and glue them at the first fiber hole, the second fiber hole, the third fiber hole and the fourth fiber hole.

[0036] Optionally, a Faraday rotator receiving device is provided at the second end of the inner frame and the outer frame, and the Faraday rotator is placed in the Faraday rotator receiving device.

[0037] According to an embodiment of the present invention, a fiber optic hydrophone and a method for manufacturing the same are provided. In this fiber optic hydrophone, the fiber optic coupler is located between an inner frame and an outer frame and is not encapsulated in a metal protective tube. This improves the axial symmetry of the fiber optic hydrophone, thereby reducing the difficulty of achieving the anti-acceleration performance of the fiber optic hydrophone and reducing the overall size of the fiber optic hydrophone, which is conducive to the miniaturization of the fiber optic hydrophone. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The following drawings of the present invention are used as part of the embodiments of the present invention for understanding the present invention. The embodiments of the present invention are shown in the drawings and the description thereof is used to explain the principle of the present invention.

[0039] In the attached figure:

[0040] Figure 1 is a flow chart of a method for manufacturing a fiber optic hydrophone according to an optional embodiment of the present invention;

[0041] Figure 2 is a flowchart of step S102;

[0042] Figure 3 is a flowchart of step S106 according to an optional embodiment of the present invention;

[0043] Figure 4 A structural diagram of a fiber optic hydrophone according to an optional embodiment of the present invention;

[0044] Figure 5 This is the structural diagram of the internal skeleton;

[0045] Figure 6 This is the structural diagram of the exoskeleton;

[0046] Figure 7 This is the left side view of the fiber optic hydrophone;

[0047] Figure 8 This is the right side view of the fiber optic hydrophone.

[0048] Description of Reference Numerals

[0049] 1-external skeleton, 2-internal skeleton, 3-first optical fiber, 4-second optical fiber, 5-optical fiber coupler, 6-first fiber passing boss, 7-first limiting boss, 8-second limiting boss, 9-third limiting boss, 10-fourth limiting boss, 11-second fiber passing boss, 12-first fiber passing hole, 13-second fiber passing hole, 14-third fiber passing hole, 15-fourth fiber passing hole, 16-end fiber passing groove, 17-first fiber paralleling groove, 18-second fiber paralleling groove. DETAILED DESCRIPTION

[0050] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details. In other instances, certain technical features well known in the art are not described to avoid confusion with the present invention.

[0051] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0052] Exemplary embodiments of the present invention will now be described in greater detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art.

[0053] First, as Figure 1 As shown, an embodiment of the present invention provides a method for manufacturing a fiber optic hydrophone, comprising:

[0054] Step S101: cutting a first optical fiber 3 of a first preset length and a second optical fiber 4 of a second preset length.

[0055] The lengths of the first optical fiber 3 and the second optical fiber 4 can be tailored based on the dimensions of the inner frame 2 and the outer frame 1. In other words, the first and second predetermined lengths are determined by the dimensions of the inner frame 2 and the outer frame 1, and this is not strictly limited in this embodiment. In some embodiments, the first optical fiber 3 serves as a reference optical fiber and is tailored to 9 meters. The second optical fiber 4 serves as a signal optical fiber and is tailored to 10 meters.

[0056] Step S102: Wrap the first optical fiber 3 around the outer periphery of the inner skeleton 2 and form a first optical fiber reserved segment at the first end and the second end of the inner skeleton 2 respectively, and wrap the second optical fiber 4 around the outer periphery of the outer skeleton 1 and form a second optical fiber reserved segment at the first end and the second end of the outer skeleton 1 respectively.

[0057] The inner frame 2 and outer frame 1 are both hollow cylindrical structures. The first end refers to either end of the cylindrical structure, and the second end is the end opposite the first end. The first and second fiber reserved sections are the lengths required for subsequent processing operations.

[0058] Step S103: Assemble the inner frame 2 wound with the first optical fiber 3 and the outer frame 1 wound with the second optical fiber 4 into one body, with a gap provided between the inner frame 2 and the outer frame 1.

[0059] Specifically, the inner frame 2 is inserted into the outer frame 1 , and epoxy glue or UV glue is used to glue the connection between the two arms at the connection between the inner frame 2 and the outer frame 1 .

[0060] Step S104: Part of the first optical fiber reserved section located at the first end of the inner skeleton 2 and part of the second optical fiber reserved section located at the first end of the outer skeleton 1 are combined and fixed in the first fiber combining groove 17, and part of the first optical fiber reserved section located at the second end of the outer skeleton 1 and part of the second optical fiber reserved section located at the second end of the outer skeleton 1 are combined and fixed in the second fiber combining groove 18.

[0061] Step S105: Use the remaining first optical fiber reserved segment and the remaining second optical fiber reserved segment located at the first end of the inner skeleton 2 to make an optical fiber coupler 5, and coat the remaining first optical fiber reserved segment and the remaining second optical fiber reserved segment located at the second end of the inner skeleton 2 with a light reflective film or make a Faraday rotator.

[0062] The optical fiber coupler 5 can be prepared by a melt-tapering method. Specifically, the coating layer of the remaining first optical fiber reserved section and the remaining second optical fiber reserved section are removed, and they are brought together in a certain way, melted at a high temperature, and stretched to both sides at the same time, finally forming a special double-cone waveguide structure in the heating area, thereby realizing a structure for coupling the transmission optical power.

[0063] The light reflective film reflects the light signal modulated by the acoustic wave to the optical fiber coupler 5, causing interference. The interfering light signal is converted into an electrical signal by the photodetector, and the information of the acoustic wave is obtained through signal processing.

[0064] In some preferred embodiments, a Faraday rotator is used to replace the light reflective film, and polarization compensation is achieved by controlling the polarization state of the light path.

[0065] Step S106: Pass the end of the first optical fiber 3 and the end of the second optical fiber 4 located at the first end of the inner skeleton 2 through the gap between the inner skeleton 2 and the outer skeleton 1, so that the optical fiber coupler 5 is located in the gap.

[0066] In steps S104-S106, the fiber-coupling slots at the end and the metal-free protective tube coupler eliminate the transitional fiber, preventing deformation of the transitional light under acceleration, thereby reducing the difficulty of reducing acceleration sensitivity. Furthermore, the fiber coupler 5 is located between the inner frame 2 and the outer frame 1 and is not encapsulated by a metal protective tube. This improves the axial symmetry of the fiber-optic hydrophone, thereby reducing the difficulty of achieving the fiber-optic hydrophone's acceleration resistance and overall size, facilitating its miniaturization.

[0067] Specifically, if Figure 2 As shown, the above step S102 includes the following steps:

[0068] Step S201: Winding the first optical fiber 3 and the second optical fiber 4 onto two fiber winding drums respectively.

[0069] Step S202: Mark the midpoints of the first optical fiber 3 and the second optical fiber 4.

[0070] The midpoints of the first optical fiber 3 and the second optical fiber 4 are located at the midpoint of the total length. For example, if the total length of the first optical fiber 3 is 9 m, the midpoint of the first optical fiber 3 is located at 4.5 m. If the total length of the second optical fiber 4 is 10 m, the midpoint of the second optical fiber 4 is located at 5 m.

[0071] Step S203: Use a ring winding machine to align the midpoint of the first optical fiber 3 with the midpoint of the first fiber slot, and align the midpoint of the second optical fiber 4 with the midpoint of the second fiber slot. The first fiber slot is located in the middle of the inner frame 2, and the second fiber slot is located in the middle of the outer frame 1.

[0072] Step S204: Use a ring winding machine to wind the first optical fiber 3 from the midpoint of the first fiber slot to the first end of the inner skeleton 2 along the first winding direction and from the midpoint of the first fiber slot to the second end of the inner skeleton 2 along the second winding direction, and form a first optical fiber reserved section at the first end and the second end of the inner skeleton 2. The first winding direction is opposite to the second winding direction.

[0073] The symmetrical winding method of winding from the central support position of the first fiber-passing slot to both ends of the inner frame 2 ensures uniform stress and process consistency during the winding process.

[0074] Step S205: Use a ring winding machine to wind the second optical fiber 4 from the midpoint of the second fiber slot to the first end of the outer skeleton 1 along the first winding direction and from the midpoint of the second fiber slot to the second end of the outer skeleton 1 along the second winding direction, and form a second optical fiber reserved section at the first end and the second end of the outer skeleton 1.

[0075] The symmetrical winding method of winding from the central support position of the second fiber slot to both ends of the outer frame 1 ensures uniform stress and process consistency during the winding process.

[0076] Step S206: using an ultraviolet curing lamp to cure the wound first optical fiber 3 and the second optical fiber 4.

[0077] Furthermore, when the remaining first optical fiber reserved section and the remaining second optical fiber reserved section at the second end of the inner skeleton 2 are coated with a light reflective film, the above step S106 includes:

[0078] The end of the first optical fiber 3 and the end of the second optical fiber 4 located at the first end of the inner skeleton 2 are passed through the first fiber hole 12 and the second fiber hole 13 in sequence, and glued at the first fiber hole 12 and the second fiber hole 13. The first fiber hole 12 is set on the first fiber paralleling groove 17, and the second fiber hole 13 is set on the second fiber paralleling groove 18, and the positions of the first fiber hole 12 and the second fiber hole 13 correspond to each other.

[0079] The ends of the first optical fiber 3 and the second optical fiber 4 pass through the first fiber insertion hole 12 and the second fiber insertion hole 13 , so that the optical fiber coupler 5 and the pigtail are housed between the inner frame 2 and the outer frame 1 .

[0080] Furthermore, if Figure 3 As shown, in the case where the Faraday rotator is manufactured by using the remaining first optical fiber reserved section at the second end of the inner frame 2 and the remaining second optical fiber reserved section at the second end of the outer frame 1, the above step S106 includes the following steps:

[0081] Step S301: Pass the end of the first optical fiber 3 and the end of the second optical fiber 4 located at the first end of the inner skeleton 2 through the first fiber hole 12, the second fiber hole 13, the third fiber hole 14 and the fourth fiber hole 15 in sequence, and glue them at the first fiber hole 12, the second fiber hole 13, the third fiber hole and the fourth fiber hole 15. The first fiber hole 12 and the fourth fiber hole 15 are arranged on the first fiber paralleling groove 17, and the second fiber hole 13 and the third fiber hole 14 are arranged on the second fiber paralleling groove 18. The positions of the first fiber hole 12 and the second fiber hole 13 correspond to each other, and the positions of the fourth fiber hole 15 and the third fiber hole 14 correspond to each other.

[0082] The ends of the first optical fiber 3 and the second optical fiber 4 are passed through the first fiber insertion hole 12, the second fiber insertion hole 13, the third fiber insertion hole 14 and the fourth fiber insertion hole 15, so that the optical fiber coupler 5 and the pigtail are stored between the inner frame 2 and the outer frame 1, avoiding the Faraday rotator storage device to avoid mutual obstruction with the Faraday rotator storage device.

[0083] Step S302 : placing the Faraday rotator in a Faraday rotator receiving device, wherein the Faraday rotator receiving device is disposed at the second ends of the inner frame 2 and the outer frame 1 .

[0084] Second, as Figure 4 As shown, an embodiment of the present invention provides a fiber optic hydrophone, including an inner skeleton 2 and an outer skeleton 1; the outer skeleton 1 is sleeved on the outside of the inner skeleton 2, and a gap is provided between the outer skeleton 1 and the inner skeleton 2; a first optical fiber 3 is wound on the inner skeleton 2 and a first optical fiber reserved section is formed at the first end and the second end of the inner skeleton 2, respectively; a second optical fiber 4 is wound on the outer skeleton 1 and a second optical fiber reserved section is formed at the first end and the second end of the outer skeleton 1, respectively; a first limiting boss 7 is provided on the portion of the inner skeleton 2 near the first end, a second limiting boss 8 is provided on the portion of the inner skeleton 2 near the second end, a third limiting boss 9 is provided on the first end of the outer skeleton 1, a fourth limiting boss 10 is provided on the second end of the outer skeleton 1, and the first limiting boss 7 and the third limiting boss are respectively provided. The platform 9 forms a first fiber paralleling groove 17, and the second limiting boss 8 and the fourth limiting boss 10 form a second fiber paralleling groove 18; part of the first optical fiber reserved section located at the first end of the inner skeleton 2 and part of the second optical fiber reserved section located at the first end of the outer skeleton 1 are paralleled and fixed in the first fiber paralleling groove 17, and part of the first optical fiber reserved section located at the second end of the outer skeleton 1 and part of the second optical fiber reserved section located at the second end of the outer skeleton 1 are paralleled and fixed in the second fiber paralleling groove 18; the remaining first optical fiber reserved section and the remaining second optical fiber reserved section located at the first end of the inner skeleton 2 are made into an optical fiber coupler 5, and the remaining first optical fiber reserved section and the remaining second optical fiber reserved section located at the second end of the inner skeleton 2 are provided with a light reflecting film or a Faraday rotator; the optical fiber coupler 5 is located in the gap.

[0085] The fiber-optic coupler 5, located between the inner frame 2 and the outer frame 1 and enclosed in a metal-free protective tube, eliminates the need for transitional fibers, preventing deformation of the transitional fibers under acceleration and thus reducing the difficulty of reducing acceleration sensitivity. Furthermore, the fiber-optic coupler 5 is located between the inner frame 2 and the outer frame 1 and is enclosed in a metal-free protective tube. This improves the axial symmetry of the fiber-optic hydrophone, thereby reducing the difficulty of achieving acceleration resistance and overall size, facilitating miniaturization.

[0086] Further, if Figure 1 、 Figure 5 and Figure 6As shown, a first fiber passing boss 6 is provided in the middle of the inner skeleton 2, and a first fiber passing groove is provided on the first fiber passing boss 6; a second fiber passing boss 11 is provided in the middle of the outer skeleton 1, and a second fiber passing groove is provided on the second fiber passing boss 11; the midpoint of the first optical fiber 3 is located at the midpoint of the first fiber passing groove, and the midpoint of the second optical fiber 4 is located at the midpoint of the second fiber passing groove. The first optical fiber 3 is wound from the midpoint of the first fiber passing groove to the first end of the inner skeleton 2 along the first winding direction and from the midpoint of the first fiber passing groove to the second end of the inner skeleton 2 along the second winding direction, and a first optical fiber reserved section is formed at the first end and the second end of the inner skeleton 2. The second optical fiber 4 is wound from the midpoint of the second fiber passing groove to the first end of the outer skeleton 1 along the first winding direction and from the midpoint of the second fiber passing groove to the second end of the outer skeleton 1 along the second winding direction, and a second optical fiber reserved section is formed at the first end and the second end of the outer skeleton 1. The first winding direction is opposite to the second winding direction.

[0087] The symmetrical winding method of winding from the central support position of the first fiber slot to the two ends of the inner skeleton 2 and the symmetrical winding method of winding from the central support position of the second fiber slot to the two ends of the outer skeleton 1 ensure uniform stress and process consistency during the winding process.

[0088] Furthermore, if Figure 7 and Figure 8 As shown, when the remaining first optical fiber reserved section and the remaining second optical fiber reserved section located at the second end of the inner skeleton 2 are provided with a light reflecting film, a first fiber through-hole 12 is provided on the first fiber paralleling groove 17, and a second fiber through-hole 13 is provided on the second fiber paralleling groove 18, and the positions of the first fiber through-hole 12 and the second fiber through-hole 13 correspond to each other; the end of the first optical fiber 3 and the end of the second optical fiber 4 located at the first end of the inner skeleton 2 pass through the first fiber through-hole 12 and the second fiber through-hole 13 in turn and are glued at the first fiber through-hole 12 and the second fiber through-hole 13.

[0089] The outer peripheries of the third limiting boss 9 and the fourth limiting boss 10 are further provided with end fiber passing grooves 16 , so that the second optical fiber reserved section can smoothly enter the first fiber paralleling groove 17 and the second fiber paralleling groove 18 .

[0090] The ends of the first optical fiber 3 and the second optical fiber 4 pass through the first fiber insertion hole 12 and the second fiber insertion hole 13 , so that the optical fiber coupler 5 and the pigtail are housed between the inner frame 2 and the outer frame 1 .

[0091] Furthermore, if Figure 7 and Figure 8As shown, when the remaining first optical fiber reserved section and the remaining second optical fiber reserved section located at the second end of the inner skeleton 2 are provided with a Faraday rotator, a first fiber through hole 12 and a fourth fiber through hole 15 are provided on the first fiber paralleling groove 17, and a second fiber through hole 13 and a third fiber through hole 14 are provided on the second fiber paralleling groove 18, and the positions of the first fiber through hole 12 and the second fiber through hole 13 correspond to each other, and the positions of the fourth fiber through hole 15 and the third fiber through hole 14 correspond to each other; the end of the first optical fiber 3 and the end of the second optical fiber 4 located at the first end of the inner skeleton 2 are passed through the first fiber through hole 12, the second fiber through hole 13, the third fiber through hole 14 and the fourth fiber through hole 15 in sequence, and are glued at the first fiber through hole 12, the second fiber through hole 13, the third fiber through hole and the fourth fiber through hole 15.

[0092] The ends of the first optical fiber 3 and the second optical fiber 4 are passed through the first fiber insertion hole 12, the second fiber insertion hole 13, the third fiber insertion hole 14 and the fourth fiber insertion hole 15, so that the optical fiber coupler 5 and the pigtail are stored between the inner frame 2 and the outer frame 1, avoiding the Faraday rotator storage device to avoid mutual obstruction with the Faraday rotator storage device.

[0093] Furthermore, a Faraday rotator receiving device is provided at the second end of the inner frame 2 and the outer frame 1 , and the Faraday rotator is placed in the Faraday rotator receiving device.

[0094] The present invention has been described through the above-described embodiments. However, it should be understood that the above-described embodiments are for illustrative and illustrative purposes only and are not intended to limit the present invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments and that various variations and modifications may be made based on the teachings of the present invention, all of which fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for manufacturing a fiber optic hydrophone, characterized in that: include: cutting a first optical fiber of a first preset length and a second optical fiber of a second preset length; Winding the first optical fiber around the outer periphery of the inner skeleton and forming first optical fiber reserved sections at the first end and the second end of the inner skeleton, and winding the second optical fiber around the outer periphery of the outer skeleton and forming second optical fiber reserved sections at the first end and the second end of the outer skeleton; Assembling an inner frame wound with a first optical fiber and an outer frame wound with a second optical fiber into one body, with a gap provided between the inner frame and the outer frame; Part of the first optical fiber reserved section at the first end of the inner skeleton and part of the second optical fiber reserved section at the first end of the outer skeleton are fixed in a first fiber paralleling groove, and part of the first optical fiber reserved section at the second end of the outer skeleton and part of the second optical fiber reserved section at the second end of the outer skeleton are fixed in a second fiber paralleling groove; A fiber coupler is fabricated using the remaining first fiber reserved segment and the remaining second fiber reserved segment at the first end of the inner skeleton, and a light reflective film is plated on the remaining first fiber reserved segment and the remaining second fiber reserved segment at the second end of the inner skeleton or a Faraday rotator is fabricated; The end of the first optical fiber and the end of the second optical fiber located at the first end of the inner skeleton are passed through the gap between the inner skeleton and the outer skeleton, so that the optical fiber coupler is located in the gap.

2. The method according to claim 1, characterized in that The method of winding the first optical fiber around the outer periphery of the inner skeleton and forming a first optical fiber reserved section at the first end and the second end of the inner skeleton, and winding the second optical fiber around the outer periphery of the outer skeleton and forming a second optical fiber reserved section at the first end and the second end of the outer skeleton, comprises: Winding the first optical fiber and the second optical fiber on two fiber winding drums respectively; Marking the midpoints of the first optical fiber and the second optical fiber; Using a ring winding machine, align the midpoint of the first optical fiber with the midpoint of the first fiber slot, and align the midpoint of the second optical fiber with the midpoint of the second fiber slot, wherein the first fiber slot is located in the middle of the inner frame, and the second fiber slot is located in the middle of the outer frame; Using a ring winding machine, the first optical fiber is wound along a first winding direction from the midpoint of the first fiber passing groove to the first end of the inner skeleton, and along a second winding direction from the midpoint of the first fiber passing groove to the second end of the inner skeleton, and a first optical fiber reserved section is formed at the first end and the second end of the inner skeleton, wherein the first winding direction is opposite to the second winding direction; Using a ring winding machine, the second optical fiber is wound along the first winding direction from the midpoint of the second fiber slot toward the first end of the exoskeleton, and along the second winding direction from the midpoint of the second fiber slot toward the second end of the exoskeleton, and a second optical fiber reserved section is formed at the first end and the second end of the exoskeleton; The wound first optical fiber and the second optical fiber are cured using an ultraviolet curing lamp.

3. The method according to claim 1, characterized in that In a case where the remaining first optical fiber reserved section and the remaining second optical fiber reserved section at the second end of the inner skeleton are coated with a light reflective film, the end of the first optical fiber and the end of the second optical fiber at the first end of the inner skeleton pass through the gap between the inner skeleton and the outer skeleton so that the optical fiber coupler is located in the gap, comprising: The end of the first optical fiber and the end of the second optical fiber located at the first end of the inner skeleton are passed through the first fiber through hole and the second fiber through hole in sequence, and glued at the first fiber through hole and the second fiber through hole. The first fiber through hole is set on the first fiber parallel groove, and the second fiber through hole is set on the second fiber parallel groove, and the positions of the first fiber through hole and the second fiber through hole correspond to each other.

4. The method according to claim 1, wherein When the Faraday rotator is manufactured by the remaining first optical fiber reserved section at the second end of the inner skeleton and the remaining second optical fiber reserved section at the second end of the outer skeleton, the end of the first optical fiber and the end of the second optical fiber at the first end of the inner skeleton pass through the gap between the inner skeleton and the outer skeleton so that the optical fiber coupler is located in the gap, including: Pass the end of the first optical fiber and the end of the second optical fiber located at the first end of the inner skeleton through the first fiber hole, the second fiber hole, the third fiber hole and the fourth fiber hole in sequence, and glue them at the first fiber hole, the second fiber hole, the third fiber hole and the fourth fiber hole, wherein the first fiber hole and the fourth fiber hole are arranged on the first parallel fiber slot, the second fiber hole and the third fiber hole are arranged on the second parallel fiber slot, and the position of the first fiber hole corresponds to the position of the second fiber hole, and the position of the fourth fiber hole corresponds to the position of the third fiber hole; The Faraday rotator is placed in the Faraday rotator receiving device, and the Faraday rotator receiving device is arranged at the second ends of the inner frame and the outer frame.

5. A fiber optic hydrophone, characterized in that: Including internal frame and external frame; The outer frame is sleeved on the outer portion of the inner frame, and a gap is provided between the outer frame and the inner frame; A first optical fiber is wound around the inner frame and a first optical fiber reserved section is formed at the first end and the second end of the inner frame respectively; a second optical fiber is wound around the outer frame and a second optical fiber reserved section is formed at the first end and the second end of the outer frame respectively; A first limiting boss is provided on a portion of the inner frame near the first end, a second limiting boss is provided on a portion of the inner frame near the second end, a third limiting boss is provided on the first end of the outer frame, and a fourth limiting boss is provided on the second end of the outer frame. The first limiting boss and the third limiting boss form a first fiber paralleling groove, and the second limiting boss and the fourth limiting boss form a second fiber paralleling groove. Part of the first optical fiber reserved section at the first end of the inner skeleton and part of the second optical fiber reserved section at the first end of the outer skeleton are fixed in parallel in the first fiber paralleling groove, and part of the first optical fiber reserved section at the second end of the outer skeleton and part of the second optical fiber reserved section at the second end of the outer skeleton are fixed in parallel in the second fiber paralleling groove; The remaining first optical fiber reserved segment and the remaining second optical fiber reserved segment located at the first end of the inner skeleton are made into an optical fiber coupler, and the remaining first optical fiber reserved segment and the remaining second optical fiber reserved segment located at the second end of the inner skeleton are provided with a light reflecting film or a Faraday rotator; the optical fiber coupler is located in the gap.

6. The fiber optic hydrophone according to claim 5, characterized in that A first fiber-passing boss is provided in the middle of the inner frame, and a first fiber-passing groove is provided on the first fiber-passing boss; a second fiber-passing boss is provided in the middle of the outer frame, and a second fiber-passing groove is provided on the second fiber-passing boss; The midpoint of the first optical fiber is located at the midpoint of the first fiber-passing groove, and the midpoint of the second optical fiber is located at the midpoint of the second fiber-passing groove. The first optical fiber is wound from the midpoint of the first fiber-passing groove to the first end of the inner skeleton along a first winding direction and from the midpoint of the first fiber-passing groove to the second end of the inner skeleton along a second winding direction, and a first optical fiber reserved section is formed at the first end and the second end of the inner skeleton. The second optical fiber is wound from the midpoint of the second fiber groove to the first end of the outer skeleton along the first winding direction and is wound from the midpoint of the second fiber groove to the second end of the outer skeleton along the second winding direction, and a second optical fiber reserved section is formed at the first end and the second end of the outer skeleton. The first winding direction is opposite to the second winding direction.

7. The fiber optic hydrophone according to claim 5, characterized in that In the case where the remaining first optical fiber reserved section and the remaining second optical fiber reserved section at the second end of the inner skeleton are provided with a light reflective film, a first fiber through-hole is provided on the first fiber paralleling slot, a second fiber through-hole is provided on the second fiber paralleling slot, and the positions of the first fiber through-hole and the second fiber through-hole correspond to each other; The end of the first optical fiber and the end of the second optical fiber located at the first end of the inner frame pass through the first fiber hole and the second fiber hole in sequence and are glued at the first fiber hole and the second fiber hole.

8. The fiber optic hydrophone according to claim 5, characterized in that: In the case where the remaining first optical fiber reserved section and the remaining second optical fiber reserved section at the second end of the inner skeleton are provided with a Faraday rotator, the first fiber paralleling slot is provided with a first fiber through-hole and a fourth fiber through-hole, the second fiber paralleling slot is provided with a second fiber through-hole and a third fiber through-hole, and the first fiber through-hole corresponds to the second fiber through-hole, and the fourth fiber through-hole corresponds to the third fiber through-hole; Pass the end of the first optical fiber and the end of the second optical fiber located at the first end of the inner skeleton through the first fiber hole, the second fiber hole, the third fiber hole and the fourth fiber hole in sequence, and glue them at the first fiber hole, the second fiber hole, the third fiber hole and the fourth fiber hole.

9. The fiber optic hydrophone according to claim 5, characterized in that A Faraday rotator receiving device is provided at the second end of the inner frame and the outer frame, and the Faraday rotator is placed in the Faraday rotator receiving device.

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