CN115707936A - Optical fiber hydrophone and manufacturing method thereof - Google Patents

Abstract

The embodiment of the invention discloses an optical fiber hydrophone and a manufacturing method thereof, wherein the method comprises the steps of assembling an inner framework and an outer framework into a whole; combining and fixing a part of first optical fiber reserved section at the first end of the inner framework and a part of second optical fiber reserved section at the first end of the outer framework in a first fiber combining groove, and combining and fixing a part of first optical fiber reserved section at the second end of the outer framework and a part of second optical fiber reserved section at the second end of the outer framework in a second fiber combining groove; manufacturing an optical fiber coupler by utilizing the residual first optical fiber reserved section and the residual second optical fiber reserved section which are positioned at the first end of the inner framework; the end part of the first optical fiber and the end part of the second optical fiber, which are located at the first end of the inner framework, penetrate through the gap between the inner framework and the outer framework, so that the optical fiber coupler is located in the gap, and the optical fiber hydrophone is packaged without a metal protection tube, so that the axial symmetry of the optical fiber hydrophone can be improved, the difficulty in realizing the anti-acceleration performance of the optical fiber hydrophone is reduced, and the miniaturization of the optical fiber hydrophone is realized.

Description

Optical fiber hydrophone and manufacturing method thereof

Technical Field

The invention relates to the field of measuring equipment, in particular to an optical fiber hydrophone and a manufacturing method thereof.

Background

The fiber optic hydrophone is a highly sensitive acoustic pressure sensor, a member of the sonar system. The piezoelectric underwater acoustic sensor has the advantages of corrosion resistance, no power supply, multiple parameters, easiness in large-scale large-span networking, capability of realizing remote real-time monitoring, all-weather work and the like, gradually replaces the traditional piezoelectric type underwater acoustic sensing system, and is widely applied to the field of marine exploration. However, the fiber coupler of the existing fiber optic hydrophone is packaged in the framework through metal, so that the axial symmetry of the fiber optic hydrophone is seriously affected.

Disclosure of Invention

In view of this, the embodiment of the present invention provides an optical fiber hydrophone and a manufacturing method thereof, so as to solve the problem that the axial symmetry of the optical fiber hydrophone is seriously affected due to the fact that an optical fiber coupler of the existing optical fiber hydrophone is encapsulated in a skeleton through metal.

In a first aspect, an embodiment of the present invention provides a method for manufacturing an optical fiber hydrophone, including:

intercepting a first optical fiber with a first preset length and a second optical fiber with a second preset length;

winding the first optical fiber on the periphery of an inner framework and respectively forming a first optical fiber reserved section at a first end and a second end of the inner framework, and winding the second optical fiber on the periphery of an outer framework and respectively forming a second optical fiber reserved section at the first end and the second end of the outer framework;

assembling an inner framework wound with a first optical fiber and an outer framework wound with a second optical fiber into a whole, wherein a gap is formed between the inner framework and the outer framework;

combining and fixing a part of first optical fiber reserved section at the first end of the inner framework and a part of second optical fiber reserved section at the first end of the outer framework in a first fiber combining groove, and combining and fixing a part of first optical fiber reserved section at the second end of the outer framework and a part of second optical fiber reserved section at the second end of the outer framework in a second fiber combining groove;

manufacturing an optical fiber coupler by utilizing the residual first optical fiber reserved section and the residual second optical fiber reserved section which are positioned at the first end of the inner framework, and plating a light reflection film on the residual first optical fiber reserved section and the residual second optical fiber reserved section which are positioned at the second end of the inner framework or manufacturing a Faraday rotator;

and penetrating the end part of the first optical fiber and the end part of the second optical fiber which are positioned at the first end of the inner framework through a gap between the inner framework and the outer framework so as to enable the optical fiber coupler to be positioned in the gap.

Optionally, the winding the first optical fiber around the outer periphery of the inner frame and forming a first optical fiber reserved section at the first end and the second end of the inner frame, and winding the second optical fiber around the outer periphery of the outer frame and forming a second optical fiber reserved section at the first end and the second end of the outer frame, respectively includes:

respectively winding the first optical fiber and the second optical fiber on two fiber winding disks;

marking the midpoint of the first optical fiber and the second optical fiber;

aligning the midpoint of a first optical fiber to the midpoint of a first fiber passing groove and aligning the midpoint of a second optical fiber to the midpoint of a second fiber passing groove by using a ring winding machine, wherein the first fiber passing groove is positioned in the middle of the inner framework, and the second fiber passing groove is positioned in the middle of the outer framework;

winding the first optical fiber from the midpoint of the first fiber passing groove to the first end of the inner framework along a first winding direction and from the midpoint of the first fiber passing groove to the second end of the inner framework along a second winding direction by using a ring winding machine, and forming a first optical fiber reserved section at the first end and the second end of the inner framework, wherein the first winding direction is opposite to the second winding direction;

winding the second optical fiber from the midpoint of the second fiber passing groove to the first end of the outer framework along the first winding direction and from the midpoint of the second fiber passing groove to the second end of the outer framework along the second winding direction by using a ring winding machine, and forming a second optical fiber reserved section at the first end and the second end of the outer framework;

and curing the wound first optical fiber and second optical fiber by using an ultraviolet curing lamp.

Optionally, 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 frame are plated with light reflection films, the end portion of the first optical fiber and the end portion of the second optical fiber at the first end of the inner frame penetrate through a gap between the inner frame and the outer frame, so that the optical fiber coupler is located in the gap, including:

the end part of a first optical fiber and the end part of a second optical fiber which are positioned at the first end of the inner framework sequentially pass through a first fiber passing hole and a second fiber passing hole, and are glued at the first fiber passing hole and the second fiber passing hole, the first fiber passing hole is arranged on the first fiber collecting groove, the second fiber passing hole is arranged on the second fiber collecting groove, and the first fiber passing hole corresponds to the second fiber passing hole in position.

Optionally, in a case where the faraday rotator is fabricated by the remaining first optical fiber reserved section at the second end of the inner frame and the remaining second optical fiber reserved section at the second end of the outer frame, an end portion of the first optical fiber and an end portion of the second optical fiber at the first end of the inner frame penetrate through a gap between the inner frame and the outer frame, so that the optical fiber coupler is located in the gap, including:

sequentially enabling the end part of a first optical fiber and the end part of a second optical fiber at the first end of the inner framework to pass through a first fiber passing hole, a second fiber passing hole, a third fiber passing hole and a fourth fiber passing hole, and gluing the first fiber passing hole, the second fiber passing hole, the third fiber passing hole and the fourth fiber passing hole, wherein the first fiber passing hole and the fourth fiber passing hole are arranged on the first fiber merging groove, the second fiber passing hole and the third fiber passing hole are arranged on the second fiber merging groove, the first fiber passing hole corresponds to the second fiber passing hole in position, and the fourth fiber passing hole corresponds to the third fiber passing hole in position;

will Faraday's rotating mirror places in Faraday's rotating mirror storage device, faraday's rotating mirror storage device sets up the second end department of inner frame and exoskeleton.

In a second aspect, an embodiment of the present invention provides an optical fiber hydrophone, including an inner frame and an outer frame;

the outer framework is sleeved outside the inner framework, and a gap is formed between the outer framework and the inner framework;

the inner framework is wound with a first optical fiber, a first optical fiber reserved section is formed at the first end and the second end of the inner framework respectively, the outer framework is wound with a second optical fiber, and a second optical fiber reserved section is formed at the first end and the second end of the outer framework respectively;

a first limiting boss is arranged on the part, close to the first end, of the inner framework, a second limiting boss is arranged on the part, close to the second end, of the inner framework, a third limiting boss is arranged on the first end of the outer framework, a fourth limiting boss is arranged on the second end of the outer framework, a first fiber combining groove is formed by the first limiting boss and the third limiting boss, and a second fiber combining groove is formed by the second limiting boss and the fourth limiting boss;

part of the first optical fiber reserved section at the first end of the inner framework and part of the second optical fiber reserved section at the first end of the outer framework are in parallel fiber fixation in the first fiber combining groove, and part of the first optical fiber reserved section at the second end of the outer framework and part of the second optical fiber reserved section at the second end of the outer framework are in parallel fiber fixation in the second fiber combining groove;

the remaining first optical fiber reserved section and the remaining second optical fiber reserved section which are positioned at the first end of the inner framework are manufactured into optical fiber couplers, and the remaining first optical fiber reserved section and the remaining second optical fiber reserved section which are positioned at the second end of the inner framework are provided with light reflecting films or Faraday rotators; the fiber coupler is located within the gap.

Optionally, a first fiber passing boss is arranged in the middle of the inner framework, and a first fiber passing groove is formed in the first fiber passing boss; a second fiber passing boss is arranged in the middle of the outer framework, and a second fiber passing groove is formed in the second fiber passing boss;

the midpoint of the first optical fiber is located at the midpoint of the first fiber passing groove, 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 the first winding direction and from the midpoint of the first fiber passing groove to the second end of the inner skeleton along the second winding direction, and first optical fiber reserved sections are 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 passing groove to the first end of the outer framework along the first winding direction and wound from the midpoint of the second fiber passing groove to the second end of the outer framework along the second winding direction, a second optical fiber reserved section is formed at the first end and the second end of the outer framework, and the first winding direction is opposite to the second winding direction.

Optionally, under the condition that the remaining first optical fiber reserved section and the remaining second optical fiber reserved section at the second end of the inner frame are provided with light reflecting films, a first fiber passing hole is formed in the first fiber collecting groove, a second fiber passing hole is formed in the second fiber collecting groove, and the first fiber passing hole corresponds to the second fiber passing hole in position;

the end part of the first optical fiber and the end part of the second optical fiber which are positioned at the first end of the inner framework sequentially penetrate through the first fiber penetrating hole and the second fiber penetrating hole and are glued at the first fiber penetrating hole and the second fiber penetrating hole.

Optionally, under the condition that faraday's rotating mirrors are arranged on the remaining first optical fiber reserved section and the remaining second optical fiber reserved section which are located at the second end of the inner framework, a first fiber passing hole and a fourth fiber passing hole are arranged on the first fiber combining groove, a second fiber passing hole and a third fiber passing hole are arranged on the second fiber combining groove, the first fiber passing hole corresponds to the second fiber passing hole in position, and the fourth fiber passing hole corresponds to the third fiber passing hole in position;

and sequentially enabling the end part of the first optical fiber and the end part of the second optical fiber which are positioned at the first end of the inner framework to pass through a first fiber passing hole, a second fiber passing hole, a third fiber passing hole and a fourth fiber passing hole, and gluing the first fiber passing hole, the second fiber passing hole, the third fiber passing hole and the fourth fiber passing hole.

Optionally, the second end department of inner frame and exoskeleton is equipped with Faraday's rotating mirror storage device, faraday's rotating mirror is placed in Faraday's rotating mirror storage device.

According to the optical fiber hydrophone and the manufacturing method thereof provided by the embodiment of the invention, the optical fiber coupler of the optical fiber hydrophone is positioned between the inner framework and the outer framework and is not packaged by the metal protection tube, so that the axial symmetry of the optical fiber hydrophone can be improved, the difficulty in realizing the acceleration resistance of the optical fiber hydrophone is reduced, the overall size of the optical fiber hydrophone is reduced, and the miniaturization of the optical fiber hydrophone is facilitated.

Drawings

The following drawings of the invention are included to provide a further understanding of the invention as a part of the examples. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

In the drawings:

FIG. 1 is a flow chart of a method of making a fiber optic hydrophone in accordance with an alternative embodiment of the invention;

FIG. 2 is a flowchart of step S102;

FIG. 3 is a flowchart of step S106 according to an alternative embodiment of the present invention;

FIG. 4 is a block diagram of a fiber optic hydrophone in accordance with an alternative embodiment of the invention;

FIG. 5 is a block diagram of the inner frame;

FIG. 6 is a block diagram of the exoskeleton;

FIG. 7 is a left side view of the fiber optic hydrophone;

FIG. 8 is a right side view of the fiber optic hydrophone.

Description of the reference numerals

1-outer framework, 2-inner framework, 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 collecting groove and 18-second fiber collecting groove.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.

It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art.

In a first aspect, as shown in fig. 1, an embodiment of the present invention provides a method for manufacturing an optical fiber hydrophone, including:

step S101: a first predetermined length of a first optical fibre 3 and a second predetermined length of a second optical fibre 4 are cut.

The lengths of the first optical fiber 3 and the second optical fiber 4 can be intercepted according to the sizes of the inner skeleton 2 and the outer skeleton 1, that is to say, the first preset length and the second preset length are determined by the sizes of the inner skeleton 2 and the outer skeleton 1, and the embodiment is not strictly limited. In some embodiments, the first fiber 3 acts as a reference fiber, intercepting 9m. The second optical fiber 4 acts as a signal fiber, intercepting 10m.

Step S102: winding first optic fibre 3 in the periphery of inner frame 2 and form first optic fibre reservation section respectively at the first end of inner frame 2 and second end to and form second optic fibre reservation section respectively with second optic fibre 4 winding in the periphery of outer frame 1 and at the first end of outer frame 1 and second end.

The inner frame 2 and the outer frame 1 are hollow cylindrical structures, the first end refers to any one of two ends of the cylindrical structure, and the second end is the end opposite to the first end, that is, the other end. The first optical fiber reserved section and the second optical fiber reserved section are the lengths required by the subsequent process operation.

Step S103: the inner frame 2 wound with the first optical fiber 3 and the outer frame 1 wound with the second optical fiber 4 are assembled into a whole, and a gap is arranged between the inner frame 2 and the outer frame 1.

Specifically, the inner frame 2 penetrates through the inner part of the outer frame 1, and the joint of the two arms is glued by adopting epoxy glue or UV glue at the joint of the inner frame 2 and the outer frame 1.

Step S104: fixing part of the first optical fiber reserved section at the first end of the inner framework 2 and part of the second optical fiber reserved section at the first end of the outer framework 1 in the first fiber combining groove 17, and fixing part of the first optical fiber reserved section at the second end of the outer framework 1 and part of the second optical fiber reserved section at the second end of the outer framework 1 in the second fiber combining groove 18.

Step S105: and manufacturing an optical fiber coupler 5 by utilizing the residual first optical fiber reserved section and the residual second optical fiber reserved section which are positioned at the first end of the inner framework 2, and plating a light reflection film on the residual first optical fiber reserved section and the residual second optical fiber reserved section which are positioned at the second end of the inner framework 2 or manufacturing a Faraday rotator.

The optical fiber coupler 5 can be prepared by adopting a fused biconical taper method, specifically, coating layers of the remaining first optical fiber reserved section and the remaining second optical fiber reserved section are removed, the optical fiber reserved sections are closed in a certain mode, fused at high temperature and stretched towards two sides, and finally a special waveguide structure of a bicone is formed in a heating zone, so that a structure for transmitting optical power coupling is realized.

The light reflection film reflects the light signal modulated by the sound wave to the optical fiber coupler 5, interference occurs, the interfered light signal is converted into an electric signal by the photoelectric detector, and the information of the sound wave is obtained through signal processing.

In some preferred embodiments, polarization compensation is achieved by controlling the polarization state of the light path by replacing the light reflecting film with a faraday rotator.

Step S106: the end of the first optical fiber 3 and the end of the second optical fiber 4 at the first end of the inner frame 2 are passed through the gap between the inner frame 2 and the outer frame 1 so that the optical fiber coupler 5 is located in the gap.

In steps S104 to S106, the transition optical fiber is eliminated by the fiber merging groove of the tip and the accommodation of the metal-free protective sleeve coupler, so that the transition light is prevented from being deformed under the acceleration, and the difficulty in reducing the acceleration sensitivity is reduced. And the optical fiber coupler 5 is positioned between the inner framework 2 and the outer framework 1 and is not packaged by a metal protection tube, so that the axial symmetry of the optical fiber hydrophone can be improved, the difficulty in realizing the acceleration resistance of the optical fiber hydrophone is reduced, the overall size of the optical fiber hydrophone is reduced, and the miniaturization of the optical fiber hydrophone is facilitated.

Specifically, as shown in fig. 2, the step S102 includes the following steps:

step S201: the first optical fiber 3 and the second optical fiber 4 are respectively wound on two fiber winding disks.

Step S202: the midpoint of the first fiber 3 and the second fiber 4 is marked.

The midpoint of the first optical fiber 3 and the second optical fiber 4 is located at the midpoint of the total length, for example, if the total length of the first optical fiber 3 is 9m, the midpoint of the first optical fiber 3 is located at 4.5m, and if the total length of the second optical fiber 4 is 10m, the midpoint of the second optical fiber 4 is located at 5 m.

Step S203: and aligning the middle point of the first optical fiber 3 to the middle point of a first fiber passing groove and aligning the middle point of the second optical fiber 4 to the middle point of a second fiber passing groove by using a ring winding machine, wherein the first fiber passing groove is positioned in the middle of the inner framework 2, and the second fiber passing groove is positioned in the middle of the outer framework 1.

Step S204: the first optical fiber 3 is wound from the midpoint of the first fiber passing groove to the first end of the inner framework 2 along the first winding direction and from the midpoint of the first fiber passing groove to the second end of the inner framework 2 along the second winding direction by using a ring winding machine, and first optical fiber reserved sections are formed at the first end and the second end of the inner framework 2, wherein the first winding direction is opposite to the second winding direction.

And the symmetrical winding mode of winding from the central support position of the first fiber passing groove to the two ends of the inner framework 2 in sequence is adopted, so that the stress uniformity and the process consistency in the winding process are ensured.

Step S205: and winding the second optical fiber 4 from the midpoint of the second fiber passing groove to the first end of the outer framework 1 along the first winding direction and from the midpoint of the second fiber passing groove to the second end of the outer framework 1 along the second winding direction by using a ring winding machine, and forming a second optical fiber reserved section at the first end and the second end of the outer framework 1.

And a symmetrical winding mode of sequentially winding the second fiber passing groove from the central support position to the two ends of the outer framework 1 is adopted, so that the stress uniformity and the process consistency in the winding process are ensured.

Step S206: and curing the wound first optical fiber 3 and second optical fiber 4 by using an ultraviolet curing lamp.

Further, in the case that the remaining first optical fiber reserved section and the remaining second optical fiber reserved section at the second end of the inner frame 2 are coated with the light reflection film, the step S106 includes:

the end part of the first optical fiber 3 and the end part of the second optical fiber 4 which are positioned at the first end of the inner framework 2 sequentially pass through the first fiber passing hole 12 and the second fiber passing hole 13 and are glued at the first fiber passing hole 12 and the second fiber passing hole 13, the first fiber passing hole 12 is arranged on the first fiber combining groove 17, the second fiber passing hole 13 is arranged on the second fiber combining groove 18, and the positions of the first fiber passing hole 12 and the second fiber passing hole 13 are corresponding.

The optical fiber coupler 5 and the pigtail are accommodated between the inner frame 2 and the outer frame 1 through the first fiber passing hole 12 and the second fiber passing hole 13 at the end portions of the first optical fiber 3 and the second optical fiber 4.

Further, as shown in fig. 3, in the case that the faraday rotator is manufactured in the remaining first optical fiber reserved section located at the second end of the inner frame 2 and the remaining second optical fiber reserved section located at the second end of the outer frame 1, the step S106 includes the following steps:

step S301: the end part of the first optical fiber 3 and the end part of the second optical fiber 4 which are positioned at the first end of the inner framework 2 sequentially pass through a first fiber passing hole 12, a second fiber passing hole 13, a third fiber passing hole 14 and a fourth fiber passing hole 15, and are glued at the first fiber passing hole 12, the second fiber passing hole 13, the third fiber passing hole and the fourth fiber passing hole 15, the first fiber passing hole 12 and the fourth fiber passing hole 15 are arranged on a first fiber collecting groove 17, the second fiber passing hole 13 and the third fiber passing hole 14 are arranged on a second fiber collecting groove 18, the positions of the first fiber passing hole 12 and the second fiber passing hole 13 are corresponding, and the positions of the fourth fiber passing hole 15 and the third fiber passing hole 14 are corresponding.

The end portions of the first optical fiber 3 and the second optical fiber 4 pass through the first fiber passing hole 12, the second fiber passing hole 13, the third fiber passing hole 14 and the fourth fiber passing hole 15, the optical fiber coupler 5 and the tail optical fiber are accommodated between the inner frame 2 and the outer frame 1, and the faraday rotary mirror accommodating device is avoided so as not to be mutually obstructed with the faraday rotary mirror accommodating device.

Step S302: place Faraday's rotating mirror in Faraday's rotating mirror storage device, faraday's rotating mirror storage device sets up at the second end department of inner frame 2 and exoskeleton 1.

In a second aspect, as shown in fig. 4, an embodiment of the present invention provides an optical fiber hydrophone, which includes an inner frame 2 and an outer frame 1; the outer framework 1 is sleeved outside the inner framework 2, and a gap is formed between the outer framework 1 and the inner framework 2; the inner framework 2 is wound with a first optical fiber 3, first optical fiber reserved sections are formed at the first end and the second end of the inner framework 2 respectively, and the outer framework 1 is wound with a second optical fiber 4, second optical fiber reserved sections are formed at the first end and the second end of the outer framework 1 respectively; a first limiting boss 7 is arranged on the part, close to the first end, of the inner framework 2, a second limiting boss 8 is arranged on the part, close to the second end, of the inner framework 2, a third limiting boss 9 is arranged on the first end of the outer framework 1, a fourth limiting boss 10 is arranged on the second end of the outer framework 1, a first fiber combining groove 17 is formed by the first limiting boss 7 and the third limiting boss 9, and a second fiber combining groove 18 is formed by the second limiting boss 8 and the fourth limiting boss 10; part of the first optical fiber reserved section at the first end of the inner framework 2 and part of the second optical fiber reserved section at the first end of the outer framework 1 are combined and fixed in the first fiber combining groove 17, and part of the first optical fiber reserved section at the second end of the outer framework 1 and part of the second optical fiber reserved section at the second end of the outer framework 1 are combined and fixed in the second fiber combining groove 18; the remaining first optical fiber reserved section and the remaining second optical fiber reserved section which are positioned at the first end of the inner framework 2 are manufactured into an optical fiber coupler 5, and the remaining first optical fiber reserved section and the remaining second optical fiber reserved section which are positioned at the second end of the inner framework 2 are provided with light reflecting films or Faraday rotators; the fiber coupler 5 is located in the gap.

Through the end and the fine groove and the no metal protective case coupler accomodate and eliminated transition optic fibre, avoid transition light to produce the condition emergence of deformation under the acceleration effect to the realization degree of difficulty that reduces acceleration sensitivity has been reduced. And the optical fiber coupler 5 is positioned between the inner framework 2 and the outer framework 1 and is not packaged by a metal protection tube, so that the axial symmetry of the optical fiber hydrophone can be improved, the difficulty in realizing the acceleration resistance of the optical fiber hydrophone is reduced, the overall size of the optical fiber hydrophone is reduced, and the miniaturization of the optical fiber hydrophone is facilitated.

Further, as shown in fig. 1, 5 and 6, a first fiber passing boss 6 is arranged in the middle of the inner frame 2, and a first fiber passing groove is arranged on the first fiber passing boss 6; a second fiber passing boss 11 is arranged in the middle of the outer framework 1, and a second fiber passing groove is formed in the second fiber passing boss 11; the middle point of the first optical fiber 3 is located at the middle point of the first fiber passing groove, the middle point of the second optical fiber 4 is located at the middle point of the second fiber passing groove, the first optical fiber 3 is wound from the middle point of the first fiber passing groove to the first end of the inner framework 2 along the first winding direction and from the middle point of the first fiber passing groove to the second end of the inner framework 2 along the second winding direction, first optical fiber reserved sections are formed at the first end and the second end of the inner framework 2, the second optical fiber 4 is wound from the middle point of the second fiber passing groove to the first end of the outer framework 1 along the first winding direction and from the middle point of the second fiber passing groove to the second end of the outer framework 1 along the second winding direction, second optical fiber reserved sections are formed at the first end and the second end of the outer framework 1, and the first winding direction is opposite to the second winding direction.

The symmetrical winding mode of winding towards the two ends of the inner framework 2 in sequence from the central support position of the first fiber passing groove and the symmetrical winding mode of winding towards the two ends of the outer framework 1 in sequence from the central support position of the second fiber passing groove ensure the uniform stress and the consistent process in the winding process.

Further, as shown in fig. 7 and 8, in the case that the remaining first fiber-reserved section and the remaining second fiber-reserved section at the second end of the inner frame 2 are provided with light-reflecting films, the first fiber-merging groove 17 is provided with a first fiber-passing hole 12, the second fiber-merging groove 18 is provided with a second fiber-passing hole 13, and the first fiber-passing hole 12 corresponds to the second fiber-passing hole 13; the end part of the first optical fiber 3 and the end part of the second optical fiber 4 which are positioned at the first end of the inner skeleton 2 sequentially pass through the first fiber passing hole 12 and the second fiber passing hole 13 and are glued at the first fiber passing hole 12 and the second fiber passing hole 13.

The 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 combining groove 17 and the second fiber combining groove 18.

The optical fiber coupler 5 and the pigtail are accommodated between the inner frame 2 and the outer frame 1 through the first fiber passing hole 12 and the second fiber passing hole 13 at the end portions of the first optical fiber 3 and the second optical fiber 4.

Further, as shown in fig. 7 and 8, under the condition that the remaining first fiber-optic reserved section and the remaining second fiber-optic reserved section at the second end of the inner frame 2 are provided with faraday's rotating mirrors, the first fiber-merging groove 17 is provided with a first fiber-passing hole 12 and a fourth fiber-passing hole 15, the second fiber-merging groove 18 is provided with a second fiber-passing hole 13 and a third fiber-passing hole 14, the first fiber-passing hole 12 corresponds to the second fiber-passing hole 13, and the fourth fiber-passing hole 15 corresponds to the third fiber-passing hole 14; the end part of the first optical fiber 3 and the end part of the second optical fiber 4, which are positioned at the first end of the inner framework 2, sequentially pass through a first fiber passing hole 12, a second fiber passing hole 13, a third fiber passing hole 14 and a fourth fiber passing hole 15, and are glued at the first fiber passing hole 12, the second fiber passing hole 13, the third fiber passing hole and the fourth fiber passing hole 15.

The end portions of the first optical fiber 3 and the second optical fiber 4 are respectively accommodated between the inner frame 2 and the outer frame 1 through the first fiber passing hole 12, the second fiber passing hole 13, the third fiber passing hole 14 and the fourth fiber passing hole 15, so that the optical fiber coupler 5 and the tail fiber are avoided from interfering with the faraday rotation mirror accommodating device.

Furthermore, the second ends of the inner frame 2 and the outer frame 1 are provided with Faraday rotator mirror storage devices, and the Faraday rotator mirror is placed in the Faraday rotator mirror storage devices.

The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, all of which fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. A method of making a fiber optic hydrophone comprising:

intercepting a first optical fiber with a first preset length and a second optical fiber with a second preset length;

winding the first optical fiber on the periphery of an inner framework and respectively forming a first optical fiber reserved section at a first end and a second end of the inner framework, and winding the second optical fiber on the periphery of an outer framework and respectively forming a second optical fiber reserved section at the first end and the second end of the outer framework;

assembling an inner framework wound with a first optical fiber and an outer framework wound with a second optical fiber into a whole, wherein a gap is formed between the inner framework and the outer framework;

combining and fixing a part of first optical fiber reserved section at the first end of the inner framework and a part of second optical fiber reserved section at the first end of the outer framework in a first fiber combining groove, and combining and fixing a part of first optical fiber reserved section at the second end of the outer framework and a part of second optical fiber reserved section at the second end of the outer framework in a second fiber combining groove;

manufacturing an optical fiber coupler by utilizing the residual first optical fiber reserved section and the residual second optical fiber reserved section which are positioned at the first end of the inner framework, and plating a light reflection film on the residual first optical fiber reserved section and the residual second optical fiber reserved section which are positioned at the second end of the inner framework or manufacturing a Faraday rotator;

and penetrating the end part of the first optical fiber and the end part of the second optical fiber which are positioned at the first end of the inner framework through a gap between the inner framework and the outer framework so as to enable the optical fiber coupler to be positioned in the gap.

2. The method of claim 1, wherein winding the first optical fiber around the outer perimeter of the inner skeleton and forming first fiber optic stubs at the first and second ends of the inner skeleton, respectively, and winding the second optical fiber around the outer perimeter of the outer skeleton and forming second fiber optic stubs at the first and second ends of the outer skeleton, respectively, comprises:

respectively winding the first optical fiber and the second optical fiber on two fiber winding disks;

marking the midpoint of the first optical fiber and the second optical fiber;

aligning the midpoint of a first optical fiber to the midpoint of a first fiber passing groove and aligning the midpoint of a second optical fiber to the midpoint of a second fiber passing groove by using a ring winding machine, wherein the first fiber passing groove is positioned in the middle of the inner framework, and the second fiber passing groove is positioned in the middle of the outer framework;

winding the first optical fiber from the midpoint of the first fiber passing groove to the first end of the inner framework along a first winding direction and from the midpoint of the first fiber passing groove to the second end of the inner framework along a second winding direction by using a ring winding machine, and forming a first optical fiber reserved section at the first end and the second end of the inner framework, wherein the first winding direction is opposite to the second winding direction;

winding the second optical fiber from the midpoint of the second fiber passing groove to the first end of the outer framework along the first winding direction and from the midpoint of the second fiber passing groove to the second end of the outer framework along the second winding direction by using a ring winding machine, and forming a second optical fiber reserved section at the first end and the second end of the outer framework;

and curing the wound first optical fiber and second optical fiber by using an ultraviolet curing lamp.

3. The method of claim 1, wherein the step of passing the end of the first optical fiber and the end of the second optical fiber through a gap between the inner frame and the outer frame with the remaining first reserved section and the remaining second reserved section of the optical fiber at the second end of the inner frame coated with a light reflecting film to locate the fiber coupler within the gap comprises:

the end part of a first optical fiber and the end part of a second optical fiber which are positioned at the first end of the inner framework sequentially penetrate through a first fiber penetrating hole and a second fiber penetrating hole, the first fiber penetrating hole is arranged on the first fiber collecting groove, the second fiber penetrating hole is arranged on the second fiber collecting groove, and the first fiber penetrating hole corresponds to the second fiber penetrating hole in position.

4. The method of claim 1, wherein, in a case where the faraday rotator is fabricated by a remaining first fiber reserve at the second end of the inner frame and a remaining second fiber reserve at the second end of the outer frame, the end portion of the first optical fiber and the end portion of the second optical fiber at the first end of the inner frame pass through a gap between the inner frame and the outer frame so that the fiber coupler is located in the gap, comprises:

sequentially enabling the end part of a first optical fiber and the end part of a second optical fiber which are positioned at the first end of the inner framework to pass through a first fiber passing hole, a second fiber passing hole, a third fiber passing hole and a fourth fiber passing hole, and gluing the first fiber passing hole, the second fiber passing hole, the third fiber passing hole and the fourth fiber passing hole, wherein the first fiber passing hole and the fourth fiber passing hole are arranged on the first fiber combining groove, the second fiber passing hole and the third fiber passing hole are arranged on the second fiber combining groove, the first fiber passing hole corresponds to the second fiber passing hole, and the fourth fiber passing hole corresponds to the third fiber passing hole;

will Faraday's rotating mirror places in Faraday's rotating mirror storage device, faraday's rotating mirror storage device sets up the second end department of inner frame and exoskeleton.

5. An optical fiber hydrophone is characterized by comprising an inner framework and an outer framework;

the outer framework is sleeved outside the inner framework, and a gap is formed between the outer framework and the inner framework;

the inner framework is wound with a first optical fiber, first optical fiber reserved sections are formed at the first end and the second end of the inner framework respectively, and the outer framework is wound with a second optical fiber, second optical fiber reserved sections are formed at the first end and the second end of the outer framework respectively;

a first limiting boss is arranged on the part, close to the first end, of the inner framework, a second limiting boss is arranged on the part, close to the second end, of the inner framework, a third limiting boss is arranged on the first end of the outer framework, a fourth limiting boss is arranged on the second end of the outer framework, a first fiber combining groove is formed by the first limiting boss and the third limiting boss, and a second fiber combining groove is formed by the second limiting boss and the fourth limiting boss;

part of the first optical fiber reserved section at the first end of the inner framework and part of the second optical fiber reserved section at the first end of the outer framework are combined and fixed in the first fiber combining groove, and part of the first optical fiber reserved section at the second end of the outer framework and part of the second optical fiber reserved section at the second end of the outer framework are combined and fixed in the second fiber combining groove;

the residual first optical fiber reserved section and the residual second optical fiber reserved section which are positioned at the first end of the inner framework are manufactured into optical fiber couplers, and the residual first optical fiber reserved section and the residual second optical fiber reserved section which are positioned at the second end of the inner framework are provided with light reflecting films or Faraday rotators; the fiber coupler is located within the gap.

6. The optical fiber hydrophone according to claim 5, wherein a first fiber passing boss is arranged in the middle of the inner frame, and a first fiber passing groove is arranged on the first fiber passing boss; a second fiber passing boss is arranged in the middle of the outer framework, and a second fiber passing groove is formed in the second fiber passing boss;

the midpoint of the first optical fiber is located at the midpoint of the first fiber passing groove, 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 the first winding direction and from the midpoint of the first fiber passing groove to the second end of the inner skeleton along the second winding direction, and first optical fiber reserved sections are 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 passing groove to the first end of the outer framework along the first winding direction and wound from the midpoint of the second fiber passing groove to the second end of the outer framework along the second winding direction, a second optical fiber reserved section is formed at the first end and the second end of the outer framework, and the first winding direction is opposite to the second winding direction.

7. The optical fiber hydrophone according to claim 5, wherein a first fiber passing hole is formed in the first fiber collecting groove, a second fiber passing hole is formed in the second fiber collecting groove, and the first fiber passing hole corresponds to the second fiber passing hole in position, when the remaining first fiber reserved section and the remaining second fiber reserved section at the second end of the inner frame are provided with the light reflecting film;

the end part of the first optical fiber and the end part of the second optical fiber which are positioned at the first end of the inner framework sequentially penetrate through the first fiber penetrating hole and the second fiber penetrating hole and are glued at the first fiber penetrating hole and the second fiber penetrating hole.

8. The optical fiber hydrophone according to claim 5, wherein in a case where the remaining first and second optical fiber reserved sections at the second end of the inner skeleton are provided with faraday's rotating mirrors, the first fiber merging groove is provided with a first fiber passing hole and a fourth fiber passing hole, the second fiber merging groove is provided with a second fiber passing hole and a third fiber passing hole, the first fiber passing hole corresponds to the second fiber passing hole in position, and the fourth fiber passing hole corresponds to the third fiber passing hole in position;

and sequentially enabling the end part of the first optical fiber and the end part of the second optical fiber which are positioned at the first end of the inner framework to pass through a first fiber passing hole, a second fiber passing hole, a third fiber passing hole and a fourth fiber passing hole, and gluing the first fiber passing hole, the second fiber passing hole, the third fiber passing hole and the fourth fiber passing hole.

9. The optical fiber hydrophone of claim 5, wherein the inner and outer frames have faraday rotator mirror receptacles at the second ends thereof, the faraday rotator mirror being disposed within the faraday rotator mirror receptacles.

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