CN107702786B - Interferometric optical fiber hydrophone probe for array - Google Patents
Interferometric optical fiber hydrophone probe for array Download PDFInfo
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- CN107702786B CN107702786B CN201710772380.4A CN201710772380A CN107702786B CN 107702786 B CN107702786 B CN 107702786B CN 201710772380 A CN201710772380 A CN 201710772380A CN 107702786 B CN107702786 B CN 107702786B
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- 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
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Abstract
An interference type optical fiber hydrophone probe for an array comprises a protection end head, an end head, a sensitization coating, an elastic fiber carrying cylinder, a supporting framework, an optical device placing shaft, a sound insulation protection sleeve, a screw and a glue injection groove. The protective end, the sensitization coating, the elastic fiber carrying cylinder and the supporting framework form a sound wave pickup part of the probe, are responsible for bearing and protecting the sensitive optical fiber and have excellent hydrophobicity and sound transmission. The optical device placing shaft, the sound insulation protective sleeve and the glue injection groove form a protective part of the probe optical device, and the probe optical device has good pressure resistance. The probe selects a bending insensitive optical fiber with small bending diameter, selects an ultra-small optical device, simultaneously adopts a Roman column type optical device placing structure, and is provided with a fixed flange on the sound insulation protective sleeve. The invention greatly saves the occupied space of optical devices, realizes the miniaturization of the probe, and ensures that the volume of the optical fiber hydrophone array is smaller and the maneuverability is higher.
Description
Technical Field
The invention belongs to the field of sensors, and relates to an interference type optical fiber hydrophone probe for an array.
Background
The optical fiber hydrophone is an underwater acoustic signal sensor based on optical fiber and photoelectron technology, is used as a novel underwater acoustic detection device, has the advantages of high sensitivity, wide response frequency band, electromagnetic interference resistance, capability of realizing underwater wet end passive detection, easiness for large-scale array formation and the like compared with the traditional piezoelectric hydrophone, becomes an important direction for the development of the underwater acoustic detection technology, and has important application in the military and civil fields. The optical fiber hydrophone can be divided into an interference type, an intensity type, a grating type and the like, wherein the development of an interference type scheme is mature. The interferometric hydrophone is based on the principle of the michelson interferometer: the light output by the laser is divided into two paths by the coupler, one path forms a sensing arm for sensing acoustic signals, and the other path forms a reference arm for providing reference phases required by demodulation. Two paths of light are interfered after being reflected by the Faraday rotating reflector, interfered optical signals are converted into electric signals through the photoelectric detector, and sound wave information can be picked up through signal processing.
At present, from the change of the technological development situation, the noise of the submarine is smaller and smaller, the maneuvering flexibility is higher and higher, and in order to adapt to the development requirement of the anti-diving technology in a new period, the real-time close monitoring and quick response of the underwater anti-diving technology are the inevitable trend of future development. Therefore, an optical fiber hydrophone array with small volume, small cable diameter and high mobility and flexibility is urgently needed, and therefore dragging the thin cable array becomes the main trend of development of future optical fiber hydrophones. The current interferometric fiber optic hydrophones have several problems that have hindered their miniaturization, such as: the minimum bending diameter of the optical fiber used in the Michelson interferometer is 15mm, so that the minimum size of the probe is limited to be larger than 15 mm; the optical devices are relatively more, and the volume of a single device is larger, so that the size of a device bin is relatively larger, and the integral length and thickness degree of the probe are influenced. Therefore, when the interference type hydrophone probes form a towing array, the array cable is large in size and poor in maneuverability and flexibility.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the interference type optical fiber hydrophone probe for the array is provided, the size of the probe is reduced, the size of the optical fiber hydrophone array is smaller, and the maneuvering flexibility is higher.
The purpose of the invention is realized by the following technical scheme:
an interferometric fiber optic hydrophone probe for an array, comprising: the device comprises a protection end head, an end head, a support framework, an elastic fiber carrying barrel, a sensitization coating, an optical device placing shaft and a sound insulation protection sleeve;
the protective end head is connected with the end head; the elastic fiber carrying cylinder is cylindrical, and the whole supporting framework is sleeved from one end of the supporting framework connected with the end head; after the end head is connected with the supporting framework, the function of a baffle is provided for the elastic fiber carrying cylinder, and the elastic fiber carrying cylinder is stably fixed on the supporting framework; the two ends of the elastic fiber carrying cylinder are provided with fiber blocking bulges, and the sensitive optical fiber is wound between the fiber blocking bulges at the two ends of the elastic fiber carrying cylinder to cover the surface of the whole elastic fiber carrying cylinder; the sensitization coating covers the whole sensitive optical fiber; two grooves are designed at one end of the support framework far away from the connecting end head and are used as a fiber outlet end and a fiber inlet end of the sensitive optical fiber; the supporting framework is connected with the optical device placing shaft; optical device lays epaxial design and has a plurality of mounting grooves for place optical device, and optical device lays epaxial design and winds fine post, and the coiling is on winding fine post after the recess of support skeleton to unnecessary optic fibre, and optical device lays the one end design that the axle kept away from around fine post and has a plurality of fine holes of going out, and one of them goes out fine hole and is used for being connected of optical device and outside transmission optical fibre to walk fine, and all the other fine holes of going out are connected with sound insulation protective sleeve.
Above-mentioned interferometric optic fibre hydrophone probe for array, the axle is laid to the play fibre hole end cover whole optical device of axle from optical device to the sound insulation protective sleeve for the protection is fixed in optical device and lays epaxial optical device, and isolated underwater sound simultaneously, the one end of sound insulation protective sleeve and optical device lay the fine jogged joint of play of axle, and be equipped with the injecting glue groove at this end, the internal diameter that the one end in injecting glue groove was kept away from to sound insulation protective sleeve is the same with the external diameter of supporting the skeleton.
According to the interference type optical fiber hydrophone probe for the array, the two ends of the supporting framework are respectively provided with the step, and the two steps and the elastic fiber carrying barrel form an air back together for sound wave pickup.
According to the interference type optical fiber hydrophone probe for the array, the arc radius of the groove in the supporting framework is larger than the minimum bending radius of the sensitive optical fiber, and the bending radius of the sensitive optical fiber passing through the groove is larger than the minimum bending radius of the sensitive optical fiber.
According to the interference type optical fiber hydrophone probe for the array, the bottom of the groove is flush with the outer diameter of the elastic fiber carrying cylinder.
Above-mentioned interference formula optic fibre hydrophone probe for array, optical device lays the axle and adopts the roman column structure, and optical device lays epaxial design and has 3 ~ 5 mounting grooves, is equipped with the optical device of michelson interferometer in the mounting groove, the optical device of michelson interferometer includes 1 coupler and 2 Faraday rotating reflection mirrors.
According to the interference type optical fiber hydrophone probe for the array, the diameter of the fiber winding column is the same as that of the elastic fiber loading barrel, and the redundant optical fibers can be smoothly wound on the fiber winding column after passing through the groove of the supporting framework.
According to the interference type optical fiber hydrophone probe for the array, the optical fiber is bending insensitive optical fiber with the bending diameter of 10-12 mm.
In the interferometric optical fiber hydrophone probe for the array, the coupler is selected from couplers with the sizes of phi 2.2-phi 2.6mm multiplied by 23-27 mm, and the Faraday rotating reflector is selected from Faraday rotating reflectors with the sizes of phi 2.4-phi 2.6mm multiplied by 11-13 mm.
Above-mentioned interference formula optic fibre hydrophone probe for array, it has the wire casing to be used for the kaivy stay cord and the transmission fiber of array cable to pass through to open on the protection end, prevents that array cable from taking place to buckle and causing the damage to optic fibre hydrophone.
In the interferometric optical fiber hydrophone probe for the array, the sensitization coating and glue injected into the glue injection groove are both polyurethane glue.
According to the interference type optical fiber hydrophone probe for the array, the connecting flange is designed on the outer side of the sound insulation protective sleeve and used for fixing the position of the probe in the array cable.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention adopts the optical fiber with small bending diameter to ensure that the part of the optical fiber hydrophone probe for picking up the acoustic signal is thinner, adopts the subminiature optical coupler and the Faraday rotating reflector and adopts the placement structure of the Roman column, greatly saves the occupied space of an optical device, fully achieves the aim of probe miniaturization, ensures that the volume of the optical fiber hydrophone array is smaller, has higher maneuvering flexibility and can be better applied to future actual engineering.
(2) The arc radius of the groove on the supporting framework is larger than the minimum bending radius of the sensitive optical fiber, so that the sensitive optical fiber is prevented from being bent in a small radius through the groove; the diameter of a fiber winding column of the optical device placing shaft is the same as that of the elastic fiber carrying cylinder, so that redundant optical fibers can be smoothly wound on the fiber winding column; the design can reduce the transmission loss of the optical fiber and improve the sensitivity of the probe.
(3) According to the invention, polyurethane glue is injected into the glue injection groove, so that the airtightness of the tail end of the probe is ensured, and the optical device is prevented from being corroded by water.
(4) According to the invention, through the design of the protection end and the upper flange of the sound insulation protection sleeve, the optical fiber hydrophone probe is more firmly fixed in the cable, the probe cannot be damaged when the array cable is bent, and the reliability of the optical fiber hydrophone probe in the cable is improved.
Drawings
FIG. 1 is a cross-sectional view of the structure of the present invention;
FIG. 2 is an exploded view of the present invention;
fig. 3 is a schematic structural view of a support framework and an elastic fiber carrying cylinder provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a structural sectional view of the invention, which comprises a protective end head 1, an end head 2, a supporting framework 3, an elastic fiber carrying sleeve 4, a sensitizing coating 5, an optical device mounting shaft 6, a sound insulation protective sleeve 7 and a screw 8. Fig. 2 is an exploded view of the present invention, and fig. 3 is a view of the supporting frame and the elastic fiber-carrying cylinder according to the present invention.
The protective end 1 and the protective end 2 are both made of stainless steel materials, and the protective end 1 and the protective end 2 are fixedly connected in a threaded screwing mode; the protective end head 1 is provided with a wire passing groove 11 for the Kevlar rope and the transmission optical fiber in the array cable to pass through, so that the optical fiber hydrophone is prevented from being damaged when the array cable is bent. The supporting framework 3 is made of hollow aluminum materials; the elastic fiber carrying cylinder 4 is cylindrical and is made of aluminum material.
As shown in fig. 3, two grooves 33 are designed at one end of the supporting framework 3 as the fiber outlet end and the fiber inlet end of the sensitive optical fiber, and the bottom of the groove 33 is flush with the outer diameter of the elastic fiber carrying cylinder 4; the arc radius of the groove is larger than the minimum bending radius of the sensitive optical fiber, so that the bending radius of the sensitive optical fiber passing through the groove is larger than the minimum bending radius of the sensitive optical fiber in the fiber feeding and discharging processes of the optical fiber wound on the elastic fiber carrying cylinder 4, the optical fiber is prevented from being bent in a small radius, and the bending loss of the optical fiber is reduced.
The elastic fiber carrying cylinder 4 is sleeved on the whole supporting framework 3 from one end of the supporting framework 3 connected with the end head 2; the end head 2 is fixedly connected with one end of the support framework 3 far away from the groove 33 through threads, so that the function of a baffle is provided for the elastic fiber carrying cylinder 4, and the elastic fiber carrying cylinder 4 can be stably fixed on the support framework 3 without slipping; the supporting framework 3 is provided with a step A31 and a step B32, the step structure is shown in figure 2, the elastic fiber carrying cylinder 4 is not tightly attached to the supporting framework 3 due to the step structure, the step structure and the supporting framework are separated by an air layer to form an air-back structure, and the air-back structure is favorable for radial deformation of the elastic fiber carrying cylinder 4, so that the sound pressure sensitivity of the optical fiber hydrophone probe is improved; sensitive optical fibers are wound between the fiber blocking bulges 41 at the two ends of the elastic fiber carrying cylinder 4 to cover the surface of the whole elastic fiber carrying cylinder 4, so that the optical fibers are tightly attached during winding, and meanwhile, the phenomenon of fiber carrying does not occur. The optical fiber in the embodiment adopts the bending insensitive optical fiber with the bending diameter of 10mm, so that the acoustic wave pickup part is ensured to be thin enough. The sensitivity enhancing coating 5 is made of polyurethane glue, the prepared polyurethane glue is slowly injected into a mould matched with the local structure after being vacuumized, and the mould is taken down after the polyurethane glue is vulcanized and dried, so that the sensitivity enhancing coating 5 is ensured to cover the whole sensitive optical fiber, the polyurethane glue has good hydrophobicity and sound permeability, and the reliability of a sound wave pickup part of the hydrophone is ensured.
An internal thread through hole is formed in the supporting framework 3 and is fixedly connected with the optical device placing shaft 6 in a threaded screwing mode. The optical device placing shaft 6 is made of stainless steel materials, a placing structure of a Roman column is adopted, 4 mounting grooves are designed for placing optical devices of a Michelson interferometer, and the optical device placing shaft specifically comprises 1 coupler and 2 Faraday rotary reflectors, wherein the coupler is a small coupler with the size of phi 2.4X 25mm, the Faraday rotary reflector is a small Faraday rotary reflector with the size of phi 2.5X 12mm, the occupied space of the optical device is saved, a probe is more miniaturized, the optical device is fixed in the mounting grooves by using double-sided adhesive, and then double-component adhesive is coated on the surfaces of the optical device and is bonded in the mounting grooves; a fiber winding column 62 is designed on the optical device mounting shaft 6, as shown in fig. 2, is positioned between the groove 33 of the support framework 3 and the mounting groove 61 and is used for winding redundant sensitive optical fibers, double-sided adhesive is adhered to the fiber winding column 62, the redundant optical fibers are firstly ensured to be tightly attached to the fiber winding column 62, and then double-component adhesive is coated on the surface of the optical fibers so as to be thoroughly fixed on the fiber winding column 62 and avoid the optical fibers from being in a suspended state; the diameter of the fiber winding column 62 is the same as that of the elastic fiber carrying cylinder 4, so that redundant optical fibers can be smoothly wound on the fiber winding column 62 after passing through the groove 33 of the supporting framework 3, and the light propagation loss in the optical fibers is reduced; a plurality of fiber outlet holes 63 are designed at one end of the optical device mounting shaft, which is far away from the fiber winding column 62, a transmission optical fiber sheath is sleeved on a bare fiber at the light inlet side of the coupler, in the embodiment, the sheath penetrates through the fiber outlet holes 63 for about 1cm, then bicomponent glue is coated on the surface of the optical fiber sheath, the thickness is about 1mm, threads are arranged in the fiber outlet holes 63, one of the fiber outlet holes 63 is used for connecting and routing an optical device of a Michelson interferometer and an external transmission optical fiber, and the other fiber outlet holes 63 are connected with the sound insulation protective sleeve 7 through screws; the sound insulation protective sleeve 7 adopts stainless steel material, sound insulation protective sleeve 7 lays whole optical device from optical device and lays axle 6 by the fine hole 63 pot head that goes out of axle 6, and fasten with screw 8, wherein it glues to coat the good double-component of making up on the screw 8, sound insulation protective sleeve 7 is used for the protection to be fixed in optical device and lays the epaxial optical device of axle 6, isolated underwater sound simultaneously, prevent that acoustic signal from producing the influence to optical device, sound insulation protective sleeve 7 outside design flange 71, a position for fixing probe in battle cable, be equipped with glue injection groove 9 at sound insulation protective sleeve 7 end, inject polyurethane glue into glue injection groove 9, guarantee the seal of probe tail end, ensure that optical device does not receive the erosion of water.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (6)
1. An interferometric fiber optic hydrophone probe for an array, comprising: the device comprises a protection end head, an end head, a support framework, an elastic fiber carrying barrel, a sensitization coating, an optical device placing shaft and a sound insulation protection sleeve; the protective end head is connected with the end head; the elastic fiber carrying cylinder is cylindrical, and the whole supporting framework is sleeved from one end of the supporting framework connected with the end head; after the end head is connected with the supporting framework, the function of a baffle is provided for the elastic fiber carrying cylinder, and the elastic fiber carrying cylinder is stably fixed on the supporting framework; the two ends of the elastic fiber carrying cylinder are provided with fiber blocking bulges, and the sensitive optical fiber is wound between the fiber blocking bulges at the two ends of the elastic fiber carrying cylinder to cover the surface of the whole elastic fiber carrying cylinder; the sensitization coating covers the whole sensitive optical fiber; two grooves are designed at one end of the support framework far away from the connecting end head and are used as a fiber outlet end and a fiber inlet end of the sensitive optical fiber; the supporting framework is connected with the optical device placing shaft; the optical device placing shaft is provided with a plurality of mounting grooves for placing optical devices, the optical device placing shaft is provided with a fiber winding column, redundant optical fibers are wound on the fiber winding column after passing through the groove of the supporting framework, one end of the optical device placing shaft, which is far away from the fiber winding column, is provided with a plurality of fiber outlet holes, one of the fiber outlet holes is used for connecting the optical devices with external transmission optical fibers to lead the optical fibers, and the other fiber outlet holes are connected with the sound insulation protective sleeve;
the protective end head is fixedly connected with the end head in a threaded screwing mode; the protective end head is provided with a wire passing groove; the protection end head is provided with a wire passing groove for the Kevlar rope and the transmission optical fiber in the array cable to pass through, so that the optical fiber hydrophone is prevented from being damaged when the array cable is bent;
the optical device mounting shaft is of a Roman column structure, 3-5 mounting grooves are designed on the optical device mounting shaft, optical devices of Michelson interferometers are mounted in the mounting grooves, and the optical devices of the Michelson interferometers comprise 1 coupler and 2 Faraday rotating reflectors;
the coupler is selected from the coupler with the size of (phi 2.2 mm-phi 2.6mm) x (23 mm-27 mm), and the Faraday rotation reflector is selected from the Faraday rotation reflector with the size of (phi 2.4 mm-phi 2.6mm) x (11 mm-13 mm);
the optical fiber is a bending insensitive optical fiber with the bending diameter of 10 mm-12 mm;
fixing the optical device in the mounting groove by using a double-sided adhesive tape, and then coating a bi-component adhesive on the surface of the optical device to bond the optical device in the mounting groove; the fiber winding column is used for winding redundant sensitive optical fibers, double-sided adhesive is adhered to the fiber winding column to ensure that the redundant optical fibers are tightly attached to the fiber winding column, and then bi-component adhesive is coated on the surfaces of the redundant optical fibers to fix the redundant optical fibers on the fiber winding column; the diameter of the fiber winding column is the same as that of the elastic fiber carrying cylinder;
the arc radius of the groove on the support framework is larger than the minimum bending radius of the sensitive optical fiber, and the arc radius is used for ensuring that the bending radius of the sensitive optical fiber passing through the groove is larger than the minimum bending radius of the sensitive optical fiber;
the sound insulation protective sleeve is made of stainless steel materials, and a connecting flange is designed on the outer side of the sound insulation protective sleeve and used for fixing the position of the probe in the array cable.
2. An interferometric fiber optic hydrophone probe for an array according to claim 1, wherein: the axle is laid to the play fine hole end cover whole optical device of axle from optical device from the optical device for the protection is fixed in optical device and lays epaxial optical device, and isolated underwater sound simultaneously, the one end of sound insulation protection sleeve and the play fine jogged joint of optical device laying axle, and be equipped with the notes groove at this end, the internal diameter that the one end in notes groove was kept away from to sound insulation protection sleeve is the same with the external diameter of supporting the skeleton.
3. An interferometric fiber optic hydrophone probe for an array according to claim 1, wherein: two ends of the supporting framework are respectively provided with a step, and the two steps and the elastic fiber carrying cylinder form an air back together for picking up sound waves.
4. An interferometric fiber optic hydrophone probe for an array according to claim 1, wherein: the bottom of the groove is flush with the outer diameter of the elastic fiber carrying cylinder.
5. An interferometric fiber optic hydrophone probe for an array according to claim 1, wherein: the diameter of the fiber winding column is the same as that of the elastic fiber loading barrel, and the fiber winding column is used for ensuring that redundant optical fibers can be smoothly wound on the fiber winding column after passing through the groove of the supporting framework.
6. An interferometric fiber optic hydrophone probe for an array according to claim 1, wherein: the sensitizing coating and the glue injected by the glue injection groove are both polyurethane glue.
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| CN201710772380.4A CN107702786B (en) | 2017-08-31 | 2017-08-31 | Interferometric optical fiber hydrophone probe for array |
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| CN201710772380.4A CN107702786B (en) | 2017-08-31 | 2017-08-31 | Interferometric optical fiber hydrophone probe for array |
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| CN109323749B (en) * | 2018-11-09 | 2022-03-08 | 威海北洋电气集团股份有限公司 | Optical fiber storage protection device in optical fiber hydrophone array |
| CN109765561B (en) * | 2019-01-29 | 2021-03-02 | 武汉普惠海洋光电技术有限公司 | Optical fiber hydrophone array segment structure and optical fiber hydrophone array structure |
| CN110879098B (en) * | 2019-12-13 | 2021-12-21 | 青岛海洋科学与技术国家实验室发展中心 | Optical fiber hydrophone for dragging |
| CN111337117B (en) * | 2020-04-14 | 2022-07-05 | 青岛海洋科学与技术国家实验室发展中心 | Optical fiber laser hydrophone |
| CN115096425A (en) * | 2022-05-13 | 2022-09-23 | 中国人民解放军国防科技大学 | Optical fiber hydrophone |
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| JP2014519014A (en) * | 2011-04-14 | 2014-08-07 | テールズ | All-optical hydrophone not affected by temperature or static pressure |
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| US5737278A (en) * | 1996-06-17 | 1998-04-07 | Litton Systems, Inc. | Extended, flexible, spatially weighted fiber optic interferometric hydrophone |
| US6549488B2 (en) * | 2001-07-10 | 2003-04-15 | Pgs Americas, Inc. | Fiber-optic hydrophone |
| CN2729667Y (en) * | 2004-09-14 | 2005-09-28 | 中国科学院西安光学精密机械研究所 | Interference type fibre-optical hydro phone |
| CN1289922C (en) * | 2005-03-18 | 2006-12-13 | 中国海洋石油总公司 | Optical fibre cable towing rectifier |
| CN201926496U (en) * | 2010-11-19 | 2011-08-10 | 中国电子科技集团公司第二十三研究所 | Separation-type grating sensor |
| CN105115586B (en) * | 2015-05-28 | 2018-05-22 | 北京航天控制仪器研究所 | A kind of anti-static pressure gas back of the body mandrel type interference optical fiber hydrophone probe of self-balancing |
| CN106772329A (en) * | 2016-12-21 | 2017-05-31 | 中国船舶重工集团公司第七〇五研究所 | A kind of hydrophone array array structure based on fiber grating F P interferometers |
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| JP2014519014A (en) * | 2011-04-14 | 2014-08-07 | テールズ | All-optical hydrophone not affected by temperature or static pressure |
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