CN114623915A - Double-diaphragm fiber grating hydrophone adopting tensile coating for sensitization - Google Patents
Double-diaphragm fiber grating hydrophone adopting tensile coating for sensitization Download PDFInfo
- Publication number
- CN114623915A CN114623915A CN202210190437.0A CN202210190437A CN114623915A CN 114623915 A CN114623915 A CN 114623915A CN 202210190437 A CN202210190437 A CN 202210190437A CN 114623915 A CN114623915 A CN 114623915A
- Authority
- CN
- China
- Prior art keywords
- diaphragm
- fiber grating
- tensile coating
- hydrophone
- supporting cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/0208—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response
- G02B6/021—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response characterised by the core or cladding or coating, e.g. materials, radial refractive index profiles, cladding shape
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02114—Refractive index modulation gratings, e.g. Bragg gratings characterised by enhanced photosensitivity characteristics of the fibre, e.g. hydrogen loading, heat treatment
Abstract
The invention relates to a double-diaphragm fiber grating hydrophone adopting tensile coating sensitization, and belongs to the technical field of fiber hydrophones. The outside cover of support drum has the sound-transmitting rubber cover, and support drum both sides rigid coupling left shell and right shell respectively, and left plane shape diaphragm and right plane shape diaphragm are installed to the inside symmetry fixed mounting of support drum, install left copper sheet and right copper sheet on the diaphragm and be used for fixed fiber grating, and the bars district both sides on the optic fibre scribble left tensile coating and right tensile coating respectively, and fiber grating passes the hole on the hydrophone axis. The advantages are that: the volume change of the oil cavity caused by sound pressure is converted into the length change of the fiber grating by the membrane, the structure is simple, and on the basis, the tensile coating is utilized to concentrate the deformation on the fiber grating in a grid region, so that the purpose of sensitization is achieved.
Description
Technical Field
The invention belongs to the technical field of optical fiber hydrophones, and particularly relates to a double-diaphragm optical fiber grating hydrophone adopting tensile coating sensitization.
Background
Acoustic waves are currently the only form of energy known to man that can be transmitted over great distances in sea water. Hydrophones are a class of sensors used to detect underwater sound waves for navigation, measurement, and communication. The conventional hydrophones can be classified into electrodynamic type, capacitive type, piezoelectric type and the like according to different principles of detecting underwater acoustic signals.
In recent years, with the rapid development of fiber optic light sources, fiber optic spectrometers and fiber grating processing technologies, fiber grating hydrophones with high performance, miniaturization and high stability are gradually called as new-generation underwater acoustic detection sensors. The fiber grating hydrophone taking the fiber grating as the sensing source is widely concerned by scientific research institutions and scholars at home and abroad in the application fields of national defense, military, detection and the like, and the related technology is unprecedented developed. Compared with other types of hydrophones, the fiber bragg grating hydrophone has the advantages of low noise, high sensitivity, large dynamic range, excellent reliability and the like, and the packaged optical fiber is used as a connecting piece, so that the fiber bragg grating hydrophone is very suitable for forming a large-scale hydrophone array, and the fiber bragg grating hydrophone is taken as national defense technical equipment which is mainly researched and developed by many countries.
The fiber grating sensor realizes a sensing function by utilizing the optical waveguide characteristic of optical fibers and the modulation effect that the grating reflects specific wavelengths and has specific parameters in a sensing environment, and the fiber grating hydrophone acquires underwater pressure and sound signals by utilizing the sensor characteristic of the fiber grating. Compared with the conventional piezoelectric hydrophone, the optical fiber hydrophone has the following advantages: the optical fiber spectrometer has the advantages of wide frequency band, high sensitivity, no electromagnetic interference, small mass, small volume and simple structure, is combined with an optical fiber light source and an optical fiber spectrometer, can be integrated and produced, and has great application prospect.
At present, the development direction of fiber grating hydrophones at present is to improve the pressure sensitivity of the fiber grating hydrophones, restrict the working frequency range of the fiber grating hydrophones by adopting a filtering structure and improve the structure to adapt to specific application occasions. How to solve the important technical problems of large acceleration response and high low-frequency-band noise existing in the existing optical fiber hydrophone, and further exploration and promotion are needed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the reliability and stability of the fiber grating hydrophone during working are improved by introducing the planar membrane and fixedly connecting the membrane with the main structure, the tensile coating structure is increased, and the sensitivity of the fiber grating hydrophone to sound pressure is improved.
In order to solve the technical problems, the invention adopts the technical scheme that:
the sound-transmitting rubber sleeve (3) is sleeved on the outer side of the supporting cylinder (9), the two sides of the supporting cylinder (9) are fixedly connected with the left shell (1) and the right shell (5) respectively, the left planar diaphragm (201) and the right planar diaphragm (401) are symmetrically and fixedly installed in the supporting cylinder (9), the left copper sheet (202) and the right copper sheet (402) are installed on the diaphragms and used for fixing the fiber bragg grating (7), the left tensile coating (8) and the right tensile coating (6) are coated on the two sides of a grid area on the optical fiber respectively, and the fiber bragg grating (7) penetrates through a hole in the central axis of the hydrophone; sealing materials are filled in gaps at the contact positions of the fiber bragg grating (7) and the hydrophone; the left shell (1), the supporting cylinder (9) and the left plane-shaped diaphragm (201) form a closed cavity; the right shell (5), the supporting cylinder (9) and the right plane-shaped diaphragm (401) form a closed cavity; an oil cavity is formed by the left plane-shaped diaphragm (201), the right plane-shaped diaphragm (401), the supporting cylinder (9) and the sound-transmitting rubber sleeve (3), and oil is filled in the oil cavity; the upper side and the lower side of the middle part of the supporting cylinder (9) are provided with holes for transmitting sound pressure in water.
The invention has the advantages that: the volume change of the oil cavity caused by sound pressure is converted into the length change of the fiber grating by the membrane, the structure is simple, and on the basis, the tensile coating is utilized to concentrate the deformation on the fiber grating in a grid region, so that the purpose of sensitization is achieved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a side cross-sectional view of the medial axis of the present invention.
Detailed Description
Specifically describing the embodiment with reference to fig. 1 and fig. 2, the double-diaphragm fiber grating hydrophone adopting the tensile coating for sensitization according to the embodiment is characterized in that a sound-transmitting rubber sleeve 3 is sleeved outside a supporting cylinder 9, two sides of the supporting cylinder 9 are fixedly connected with a left shell 1 and a right shell 5 respectively, a left planar diaphragm 201 and a right planar diaphragm 401 are symmetrically and fixedly installed inside the supporting cylinder 9, a left copper sheet 202 and a right copper sheet 402 are installed on the diaphragms and used for fixing a fiber grating 7, a left tensile coating 8 and a right tensile coating 6 are respectively coated on two sides of a grating area on an optical fiber, and the fiber grating 7 penetrates through a hole in the central axis of the hydrophone; sealing materials are filled in gaps at the contact positions of the fiber bragg grating 7 and the hydrophone; the left shell 1, the supporting cylinder 9 and the left plane-shaped diaphragm 201 form a closed cavity; the right shell 5, the supporting cylinder 9 and the right plane-shaped membrane 401 form a closed cavity; the left plane-shaped diaphragm 201, the right plane-shaped diaphragm 401, the supporting cylinder 9 and the sound-transmitting rubber sleeve 3 form an oil cavity, and the inside of the oil cavity is filled with oil; the upper and lower sides of the middle part of the supporting cylinder 9 are provided with holes for transmitting sound pressure in water.
The fiber grating hydrophone disclosed by the invention has the following working principle: when the hydrophone receives underwater acoustic pressure underwater, the acoustic pressure acts on oil in an oil cavity through the sound-transmitting rubber sleeve 3, the oil is extruded and transmits the pressure to the left plane-shaped diaphragm 201 and the right plane-shaped diaphragm 401 which are fixed on the supporting cylinder 9, the left plane-shaped diaphragm 201 and the right plane-shaped diaphragm 401 deform axially and transmit the deformation to the fiber grating 7 which is fixed between the left copper sheet 202 and the right copper sheet 402, when the fiber grating 7 deforms axially, most of the axial deformation is concentrated in a grating area due to the existence of a tensile coating, the sensitivity of the fiber hydrophone to the underwater acoustic pressure is increased, the wavelength of reflected light of the fiber hydrophone changes, and corresponding underwater acoustic information can be obtained by measuring the wavelength reflected in the fiber grating 7.
Claims (1)
1. A double-diaphragm fiber grating hydrophone adopting tensile coating sensitization comprises: left shell (1), left plane shape diaphragm (201), left copper sheet (202), sound-transmitting rubber sleeve (3), right plane shape diaphragm (401), right copper sheet (402), right shell (5), right tensile coating (6), fiber grating (7), left tensile coating (8), support cylinder (9), its characterized in that: the sound-transmitting rubber sleeve (3) is sleeved on the outer side of the supporting cylinder (9), the two sides of the supporting cylinder (9) are fixedly connected with the left shell (1) and the right shell (5) respectively, the left planar diaphragm (201) and the right planar diaphragm (401) are symmetrically and fixedly installed in the supporting cylinder (9), the left copper sheet (202) and the right copper sheet (402) are installed on the diaphragms and used for fixing the fiber bragg grating (7), the left tensile coating (8) and the right tensile coating (6) are coated on the two sides of a grid area on the optical fiber respectively, and the fiber bragg grating (7) penetrates through a hole in the central axis of the hydrophone; sealing materials are filled in gaps at the contact positions of the fiber bragg grating (7) and the hydrophone; the left shell (1), the supporting cylinder (9) and the left plane-shaped diaphragm (201) form a closed cavity; the right shell (5), the supporting cylinder (9) and the right plane-shaped diaphragm (401) form a closed cavity; an oil cavity is formed by the left plane-shaped diaphragm (201), the right plane-shaped diaphragm (401), the supporting cylinder (9) and the sound-transmitting rubber sleeve (3), and oil is filled in the oil cavity; the upper side and the lower side of the middle part of the supporting cylinder (9) are provided with holes for transmitting sound pressure in water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210190437.0A CN114623915A (en) | 2022-02-28 | 2022-02-28 | Double-diaphragm fiber grating hydrophone adopting tensile coating for sensitization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210190437.0A CN114623915A (en) | 2022-02-28 | 2022-02-28 | Double-diaphragm fiber grating hydrophone adopting tensile coating for sensitization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114623915A true CN114623915A (en) | 2022-06-14 |
Family
ID=81899446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210190437.0A Withdrawn CN114623915A (en) | 2022-02-28 | 2022-02-28 | Double-diaphragm fiber grating hydrophone adopting tensile coating for sensitization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114623915A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040228594A1 (en) * | 2003-01-03 | 2004-11-18 | Alcatel | Optical fiber having at least one bragg grating obtained by writing directly through the coating covering the cladding |
| CN101210832A (en) * | 2006-12-28 | 2008-07-02 | 中国科学院半导体研究所 | Optical fiber grating sonic device |
| CN101210842A (en) * | 2006-12-31 | 2008-07-02 | 中国科学院半导体研究所 | Static pressure self-compensation optical fibre grating sonic device |
| CN101285700A (en) * | 2007-04-11 | 2008-10-15 | 中国科学院半导体研究所 | Piston type optical fibre grating sonic device |
| US20120082415A1 (en) * | 2009-05-29 | 2012-04-05 | Ixblue | Bragg grating fiber hydrophone with a bellows amplifier |
| US20120093463A1 (en) * | 2009-05-29 | 2012-04-19 | Ixblue | Fiber bragg grating hydrophone comprising a diaphragm amplifier |
| CN104792401A (en) * | 2015-04-14 | 2015-07-22 | 中国计量学院 | Fiber grating hydrophone for measuring near-field acoustic pressure distribution of high-frequency transducer and manufacturing method |
| AU2017100218A4 (en) * | 2016-03-01 | 2017-03-23 | Shenzhen University | Parallel-integrated fiber bragg grating, method and device for manufacturing the same |
| CN110849463A (en) * | 2019-10-24 | 2020-02-28 | 武汉理工大学 | Underwater sound sensing optical cable and sensitivity enhancing coating method thereof |
| CN112924013A (en) * | 2021-01-28 | 2021-06-08 | 哈尔滨工程大学 | Acceleration-resistant optical fiber hydrophone probe device |
-
2022
- 2022-02-28 CN CN202210190437.0A patent/CN114623915A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040228594A1 (en) * | 2003-01-03 | 2004-11-18 | Alcatel | Optical fiber having at least one bragg grating obtained by writing directly through the coating covering the cladding |
| CN101210832A (en) * | 2006-12-28 | 2008-07-02 | 中国科学院半导体研究所 | Optical fiber grating sonic device |
| CN101210842A (en) * | 2006-12-31 | 2008-07-02 | 中国科学院半导体研究所 | Static pressure self-compensation optical fibre grating sonic device |
| CN101285700A (en) * | 2007-04-11 | 2008-10-15 | 中国科学院半导体研究所 | Piston type optical fibre grating sonic device |
| US20120082415A1 (en) * | 2009-05-29 | 2012-04-05 | Ixblue | Bragg grating fiber hydrophone with a bellows amplifier |
| US20120093463A1 (en) * | 2009-05-29 | 2012-04-19 | Ixblue | Fiber bragg grating hydrophone comprising a diaphragm amplifier |
| CN104792401A (en) * | 2015-04-14 | 2015-07-22 | 中国计量学院 | Fiber grating hydrophone for measuring near-field acoustic pressure distribution of high-frequency transducer and manufacturing method |
| AU2017100218A4 (en) * | 2016-03-01 | 2017-03-23 | Shenzhen University | Parallel-integrated fiber bragg grating, method and device for manufacturing the same |
| CN110849463A (en) * | 2019-10-24 | 2020-02-28 | 武汉理工大学 | Underwater sound sensing optical cable and sensitivity enhancing coating method thereof |
| CN112924013A (en) * | 2021-01-28 | 2021-06-08 | 哈尔滨工程大学 | Acceleration-resistant optical fiber hydrophone probe device |
Non-Patent Citations (3)
| Title |
|---|
| 唐波 等: "光纤光栅水听器探头封装技术研究进展", 《光通信技术》 * |
| 唐波 等: "分布反馈式光纤激光水听器的声压灵敏度频率响应特性", 《光学学报》 * |
| 张文涛 等: "光纤激光水听器研究进展", 《集成技术》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101726354B (en) | Optical fiber laser vector hydrophone | |
| CN100514006C (en) | Optical fiber grating sonic device | |
| CN100587415C (en) | Piston type optical fibre grating sonic device | |
| CN100507475C (en) | Static pressure self-compensation optical fibre grating sonic device | |
| CN103528665A (en) | Novel Fabry-Perot interference MEMS (Micro Electro Mechanical System) sound wave sensor | |
| CN201892569U (en) | High-sensitivity and low-frequency vibrating sensor based on MMF-TFBG optical fiber structure | |
| CN111103051A (en) | Optical fiber interference type hydrophone detection system and method | |
| CN109060106B (en) | Double-cavity combined optical interference sound sensor probe and sensing system thereof | |
| CN103674219A (en) | Fiber grating based interference type three-dimensional vector hydrophone | |
| CN112924013B (en) | Acceleration-resistant optical fiber hydrophone probe device | |
| CN105021271B (en) | A kind of optical fiber EFPI infrasonic sensors and infrasound signals detection system | |
| CN107911782B (en) | Optical fiber microphone probe and optical fiber microphone system | |
| CN111256807B (en) | Small-size interference type high-frequency optical fiber hydrophone based on folding air cavity | |
| CN102707091A (en) | Double-grating optical fiber vector accelerometer based on cantilever beam | |
| CN112629641B (en) | Flywheel-shaped diaphragm type high-sensitivity standard hydrophone and method | |
| CN114623915A (en) | Double-diaphragm fiber grating hydrophone adopting tensile coating for sensitization | |
| CN114623913A (en) | Fiber grating hydrophone adopting cymbal-shaped diaphragm and tensile coating | |
| CN114623914A (en) | Fiber grating hydrophone adopting frustum diaphragm and tensile coating | |
| CN114623916A (en) | Fiber grating hydrophone adopting double-cone-frustum-shaped diaphragm | |
| CN104697624A (en) | Acoustic detector based on Michelson interferometer | |
| CN114674411A (en) | Fiber grating hydrophone adopting double cymbals-shaped diaphragms | |
| CN109060105A (en) | A kind of fermat spiral optical fiber ring structured novel hydrophone probe | |
| CN208458873U (en) | A kind of fermat spiral optical fiber ring structured novel hydrophone probe | |
| CN114593811A (en) | Low-pass filtering fiber grating hydrophone adopting cymbal-shaped diaphragm | |
| CN114623918A (en) | Low-pass filtering fiber grating hydrophone adopting tensile coating for sensitization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20220614 |