CN110006517A - Air backing is nonelastic body fiber optic hydrophone unit and processing method - Google Patents
Air backing is nonelastic body fiber optic hydrophone unit and processing method Download PDFInfo
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- CN110006517A CN110006517A CN201910231723.5A CN201910231723A CN110006517A CN 110006517 A CN110006517 A CN 110006517A CN 201910231723 A CN201910231723 A CN 201910231723A CN 110006517 A CN110006517 A CN 110006517A
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- fiber optic
- optical fiber
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- rigid body
- hydrophone
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of nonelastic body fiber optic hydrophone unit of air backing and processing methods, it mainly include fiber optic coils and support rigid body, it supports and groove is set on the periphery of rigid body, fiber optic coils are coaxially fixed on the periphery of support rigid body and form closed cavity as air backing with groove；Fiber optic coils turn to required shape by optical fiber, integrally and between the fibers form optical fiber gap by the internal all optical fiber adjacent surfaces of bonding.The invention has the benefit that the nonelastic body of fiber optic hydrophone unit, effectively reduces hydrophone weight and volume, fibre optic hydrophone has been expanded in the application in small-sized acoustic array field.Fiber optic coils are directly fixed with support rigid body in nonelastic body fiber optic hydrophone unit, are conducive to the realization of small-sized fibre optic hydrophone；Sound field directly causes fiber lengths in fiber optic coils to change, and sensitivity influence factor is single；For different application demand, the volume and material parameter of change coil inner fiber gap bonding agent can be passed through.
Description
Technical field
The present invention relates to fiber optic hydrophone unit, mainly a kind of air backing is nonelastic body fiber optic hydrophone unit and add
Work method.
Background technique
Fibre optic hydrophone is a kind of fibre optical sensor for converting sound pressure signal in water to detectable optical signal modulation, because of it
Have many advantages, such as high sensitivity, not vulnerable to electromagnetic environment interference, be easy to be multiplexed, obtained quick hair in Military and civil fields in recent years
Exhibition.Air backing fibre optic hydrophone because of its simple process, function admirable and be used widely.
Existing air backing fibre optic hydrophone is made of support rigid body, elastomer, fiber optic coils, by support rigid body
The fixed elastomer of upper sealing, supports sealing between rigid body and elastomer to form closed cavity, optical fiber is wound on elastomer.Elasticity
Body occupies the volume and weight of hydrophone probe, this is particularly problematic in small-sized application；Sensitivity is by two
Strain transmission efficiency limitation between kind material, influence factor are complicated；The improved method of sensitivity and environmental performance is limited.By institute
When stating hydrophone and being placed in underwater sound field, elastomer drives the deformation of fiber optic coils, and leads to the length and refractive index of fiber core
Change (elasto-optical effect), so as to cause the phase change for transmitting light in optical fiber, detected the phase change by the interference of light
It is i.e. extractable to act on sound pressure signal thereon.
After sound field causes optical-fiber deformation, according to elasto-optical effect, single mode optical fiber radial refractive index changes and anisotropic strain
Relational expression be formula (1):
Δ n is the change of single mode optical fiber radial refractive index in formula (1), and n is optical fibre refractivity, P11With P12For fiber core
Elasto-optical coefficient, εzFor fiber core axial strain, εrFor fiber core radial strain.
Light phase changes the relational expression changed with refractive index, length and is derived as formula (2):
ΔΦ is light phase change, β in formula (2)0For light propagation constant in vacuum, L is optical fiber overall length, and Δ L is that optical fiber is long
Degree changes.
It is formula (3) that formula (1) substitution formula (2), which can be obtained light phase to change with the relational expression of fibre core strain:
By formula (3) it is found that simulation calculation fibre optic hydrophone optical fiber axial direction, radial strain when by sound field reflecting, substitute into
The parameters such as fiber lengths can calculate hydrophone sensitivity.
In addition to sensitivity, the application of fibre optic hydrophone is also limited by environmental performance, volume, weight.Existing air backing
Fibre optic hydrophone, which mainly passes through, changes the methods of fiber lengths, structure size, structural material parameter change properties, but effect
It is limited.So a kind of new air backing fibre optic hydrophone that is small-sized and being easy to improve sensitivity and environmental performance need to be found
Structure.
Summary of the invention
It is not easy for existing fiber optic hydrophone unit volume with weight to reduce, sensitivity and environmental performance are not easy to optimize asks
Topic, the purpose of the present invention is to provide a kind of nonelastic body fiber optic hydrophone unit of air backing and processing methods, effectively to drop
Low hydrophone weight and volume facilitate by adjusting bonding agent parameter and change hydrophone sensitivity and environmental performance.
The object of the present invention is achieved by the following technical solutions.A kind of nonelastic body fibre optic hydrophone of air backing
Probe mainly includes fiber optic coils and support rigid body, and nonelastic body supports and groove is arranged on the periphery of rigid body, fiber optic coils
It is coaxially fixed on the periphery of support rigid body and forms closed cavity as air backing with groove；The fiber optic coils are by light
Fibre turns to required shape, integrally and is between the fibers formed between optical fiber by the internal all optical fiber adjacent surfaces of bonding
Gap.
It is filled with bonding agent in the optical fiber gap, by changing the volume and material parameter of bonding agent, changes optical fiber
The sensitivity and environmental performance of hydrophone.
A kind of processing method of the nonelastic body fiber optic hydrophone unit of air backing, this method comprises the following steps:
1, process fiber optic coils: length of fibre needed for coiling applies bonding agent, makes in winding process or after the completion of coiling
Bonding agent is evenly coated around optical fiber；Solidify bonding agent, so that each adjacent surface of optical fiber sticks into one；Winding tool is removed, it will
Fiber optic coils abjection；
2, fiber optic coils are fixed on support rigid body by resistance to hydrostatic pressure sealing means.
The invention has the benefit that
(1) the nonelastic body of the fiber optic hydrophone unit effectively reduces hydrophone weight and volume, has expanded optical fiber water
Listen device in the application in small-sized acoustic array field.
(2) fiber optic coils are directly fixed with support rigid body in nonelastic body fiber optic hydrophone unit, are conducive to small-sized light
The realization of fine hydrophone；Sound field directly causes fiber lengths in fiber optic coils to change, and sensitivity influence factor is single；For difference
Application demand can facilitate by the volume and material parameter of change coil inner fiber gap bonding agent and change fibre optic hydrophone
Sensitivity and environmental performance.
Detailed description of the invention
Fig. 1 is the nonelastic body fiber optic hydrophone unit sectional view of air backing.
Description of symbols: fiber optic coils 10, optical fiber 11, optical fiber gap 12, closed cavity 13 support rigid body 14, coil
Axis 15.
Specific embodiment
Below in conjunction with attached drawing, the present invention will be described in detail:
Embodiment 1: a kind of nonelastic body fiber optic hydrophone unit of air backing mainly includes that fiber optic coils 10 and support are rigid
Body 14, nonelastic body support and groove are arranged on the periphery of rigid body 14, and fiber optic coils 10 are coaxially fixed on the outer of support rigid body 14
Closed cavity 13 is formed as air backing on disc and with groove to improve sensitivity.；The fiber optic coils 10 are by optical fiber 11
Required shape is turned to, is formed between optical fiber integrally and between optical fiber 11 by internal all 11 adjacent surfaces of optical fiber of bonding
Gap 12, optical fiber gap 12 are left a blank.
Embodiment 2: as shown in Figure 1, the nonelastic body of fiber optic hydrophone unit of the invention, rigid by fiber optic coils 10 and support
Body 14 coaxial (coil axis 15) sealing fixation forms, the closed cavity that fiber optic coils 10 form it between support rigid body 14
13 are used as air backing to improve sensitivity.Fiber optic coils 10 turn to required shape by optical fiber 11, by being bonded internal optical fiber
11 adjacent surface and it is integral, optical fiber gap 12 fill different volumes and material parameter bonding agent, pass through change bonding agent
Volume and material parameter, change the sensitivity and environmental performance of fibre optic hydrophone.According to needed for application, optical fiber 11 can be guarantor
Partially or general single mode fiber, fiber optic coils 10 and support rigid body 14 can be processed into cylindricality or other shapes, and support rigid body can be selected
The rigid materials such as aluminium alloy, titanium alloy, stainless steel, it is close by the resistance to hydrostatic pressure such as Nian Jie between fiber optic coils 10 and support rigid body 14
Envelope mode is fixed, and closed cavity 13 when underwater operation is avoided to fail.
The present invention discloses a kind of processing method of the nonelastic body fiber optic hydrophone unit of air backing, this method packets
Include following steps:
1, fiber optic coils 10: length of fibre 11 needed for coiling are processed, apply bonding in winding process or after the completion of coiling
Agent is evenly coated 11 surrounding bonding agent of optical fiber；Solidify bonding agent, so that each adjacent surface of optical fiber 11 sticks into one；Remove around
Tooling processed deviates from fiber optic coils 10；
2, fiber optic coils 10 are fixed on support rigid body 14 by resistance to hydrostatic pressure sealing means.
Existing air backing fiber optic hydrophone unit is wound on by sealing fixed elastomer, optical fiber on support rigid body
It forms on the outside of elastomer, sound field causes elastomer deformation when work, and elastomer drives the fiber lengths variation of coiling thereon, in turn
Change transmission light phase.The advantages of flexible body fibre optic hydrophone is that optical fiber is directly wound on elastomer, simple process；The disadvantage is that
Elastomer occupies the volume and weight of hydrophone probe, this is particularly problematic in small-sized application.The present invention mentions
Nonelastic body fiber optic hydrophone unit out removes winding tool after the completion of fiber optic coils coiling, fiber optic coils directly with support
Rigid body is fixed, and is avoided elastomer to the occupancy of hydrophone probe size and weight, is conducive to the reality of small-sized fibre optic hydrophone
It is existing.
In addition, flexible body fibre optic hydrophone sensitivity is limited by the strain transmission efficiency between two kinds of materials, influence
Factor is complicated, and technique is not easy to control.At work, sound field directly causes nonelastic body fiber optic hydrophone unit proposed by the present invention
In fiber optic coils fiber lengths change, there is no between elastomer and fiber optic coils strain transmit loss, sensitivity influence because
Element is single, and technique is easily controllable.
Difference of the different application to performances such as hydrophone sensitivity, resistance to hydrostatic pressure, vibrations is required, except change light
Outside the existing methods such as fine length, supporting way, nonelastic body fibre optic hydrophone proposed by the present invention can be by changing light in coil
The volume and material parameter of fine gap bonding agent facilitate the sensitivity and environmental performance for changing hydrophone.Pass through simulation calculation table
It is bright, 3 layers of 52.1m optical fiber coiling, the nonelastic body fiber optic hydrophone unit sensitivity of packless air backing of optical fiber gap is reachable-
126dB, resonance frequency is in 1.1kHz or more.The rigidity of optical fiber gap filling bonding agent is higher, and optical fiber water proposed by the present invention is listened
Device sensitivity is lower, and resistance to hydrostatic pressure is higher, and vibration performance is better；The volume of optical fiber gap filling bonding agent is bigger, to optical fiber water
Listen the change of device performance bigger.To different application, simulation calculation and experiment flexible choice optical fiber gap bonding agent can be passed through
Volume and material parameter.For parameter designing as a result, matured product can be selected in binder, gold can also be added in matured product
Belong to the materials such as powder to be modified, changing relative to existing elastomer structure and material has bigger performance change range.
It is understood that it will be understood by those skilled in the art that being subject to technical solution of the present invention and inventive concept
It all should fall within the scope of protection of the appended claims of the present invention with replacement or change.
Claims (3)
1. a kind of nonelastic body fiber optic hydrophone unit of air backing, it is characterised in that: mainly include fiber optic coils (10) and branch
It supports rigid body (14), supports and groove is set on the periphery of rigid body (14), fiber optic coils (10) are coaxially fixed on support rigid body (14)
Periphery on and with groove formed closed cavity (13) be used as air backing；The fiber optic coils (10) are by optical fiber (11) coiling
At required shape, formed between optical fiber integrally and between optical fiber (11) by internal all optical fiber (11) adjacent surfaces of bonding
Gap (12).
2. the nonelastic body fiber optic hydrophone unit of air backing according to claim 1, it is characterised in that: the optical fiber
It is filled with bonding agent in gap (12), by changing the volume and material parameter of bonding agent, changes the sensitivity of fibre optic hydrophone
With environmental performance.
3. a kind of processing method of the nonelastic body fiber optic hydrophone unit of air backing, it is characterised in that: this method includes as follows
Step:
(1), process fiber optic coils (10): length of fibre needed for coiling (11) applies viscous in winding process or after the completion of coiling
Agent is connect, optical fiber (11) surrounding bonding agent is evenly coated；Solidify bonding agent, so that optical fiber (11) each adjacent surface sticks into one；
Winding tool is removed, fiber optic coils (10) are deviate from；
(2), fiber optic coils (10) are fixed in support rigid body (14) by resistance to hydrostatic pressure sealing means.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910231723.5A CN110006517A (en) | 2019-03-26 | 2019-03-26 | Air backing is nonelastic body fiber optic hydrophone unit and processing method |
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| CN201910231723.5A CN110006517A (en) | 2019-03-26 | 2019-03-26 | Air backing is nonelastic body fiber optic hydrophone unit and processing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112432695A (en) * | 2020-11-16 | 2021-03-02 | 之江实验室 | Spiral optical fiber distributed sound field direction judgment method based on elastic body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112432695A (en) * | 2020-11-16 | 2021-03-02 | 之江实验室 | Spiral optical fiber distributed sound field direction judgment method based on elastic body |
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Application publication date: 20190712 |