CN1289922C - Optical fibre cable towing rectifier - Google Patents
Optical fibre cable towing rectifier Download PDFInfo
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- CN1289922C CN1289922C CN 200510055607 CN200510055607A CN1289922C CN 1289922 C CN1289922 C CN 1289922C CN 200510055607 CN200510055607 CN 200510055607 CN 200510055607 A CN200510055607 A CN 200510055607A CN 1289922 C CN1289922 C CN 1289922C
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- optical fiber
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- fibre cable
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Abstract
The present invention discloses a fiber towrope wave detector which comprises a rigid container, a first fiber coupler, a second fiber coupler, a signal arm fiber and a reference arm fiber, wherein both ends of the signal arm fiber and the reference arm fiber are respectively connected with the first fiber coupler and the second fiber coupler. The present invention is characterized in that the rigid container is a sealing body with a fiber outlet/inlet; the sensing sections of the signal arm fiber and the reference arm fiber are wound outside the rigid container; the first fiber coupler, the second fiber coupler and the conduction sections of the signal arm fiber and the reference arm fiber are all arranged in the rigid container. The fiber towrope wave detector of the present invention can improve the stability and the SNR of a system, and improve detection capability for weak signals. The present invention has the advantages of simple connection and convenient maintenance.
Description
Technical field
The present invention relates to a kind of optical fiber underwater sound sensor, particularly relate to a kind of phase interference type optical fiber underwater sound sensor that is suitable for constituting optical fiber towing array.
Background technology
At sea in seismic prospecting data collecting and the reservoir monitoring technology, the marine streamer wave detector array that is made of multiplexed nautical receiving set has occupied very important position.Early stage underwater sound sensor is the piezoelectric hydrophone that adopts piezoelectric ceramics and PVDF to make, and through nearly 30 years research, existing so far tens kinds of dissimilar optical fiber underwater sound sensor systems come out.Research thinks that in intensity type, polarization-type and three kinds of optical fiber underwater sound sensors of phase interference type, phase interference type optical fiber underwater sound sensor is suitable for constituting the cable towing rectifier array as optical fibre cable towing rectifier.
The optical fibre cable towing rectifier of phase interference type utilizes the principle of fibre optic interferometer to detect sound pressure signal, typical fibre optic interferometer theory diagram as shown in Figure 1, the light that is sent by light source 100 is divided into two after first fiber coupler 101, two-way light is respectively by reference arm optical fiber 102 and 103 transmission of signal arm optical fiber, then interfere in second fiber coupler, 104 positions, the amplitude of the amplitude of interference light and flashlight and reference light all has relation, its phase place is the poor of two arm light phases, and interference light is converted to electric signal by photoelectric commutator 105.The intensity of the electric signal of conversion gained is directly proportional with the light intensity of interference light, and promptly amplitude and the phase place with interference light is relevant simultaneously.When the light phase of signal arm optical fiber 103 changes, and the light phase of reference arm optical fiber 102 is when remaining unchanged, the phase change of interference light, thereby the Strength Changes of influence output electric signal.Signal arm optical fiber 103 and reference arm optical fiber 102 all can be divided into the conductive sections of conducting usefulness and be used for receiving the sensing section (spiral helicine one section of figure) of sound pressure signal.
The fiber coupler and the conductive sections optical fiber of existing phase interference type optical fiber underwater sound sensor are not within the same enclosed cavity, extraneous acoustic pressure and various interference can not be ignored the effect of fiber coupler and conductive sections optical fiber, sound pressure signal can not fully concentrate on the sensing section optical fiber the effect of whole wave detector, has influenced the stability and the signal to noise ratio (S/N ratio) of system.In addition, the structural design of reference arm and signal arm Fibre Optical Sensor section can't be eliminated noise and external interference fully, also is unfavorable for the raising to Detection of weak ability and signal to noise ratio (S/N ratio).At last, the fibre-optical probe of existing fiber cable towing rectifier can not exchange, the inconvenience that has caused connection, changes and keeped in repair.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of optical fibre cable towing rectifier, can improve the stability and the signal to noise ratio (S/N ratio) of system.
In order to solve the problems of the technologies described above, the invention provides a kind of optical fibre cable towing rectifier, comprise a rigid container, first fiber coupler, second fiber coupler, and two ends be connected respectively to this first, the signal arm optical fiber of second fiber coupler and reference arm optical fiber, it is characterized in that, described rigid container is the cylindric obturator that leaves the optical fiber gateway, the sensing section of described signal arm optical fiber and reference arm optical fiber is wrapped in outside the described rigid container, and described first, the conductive sections of second fiber coupler and described signal arm optical fiber and reference arm optical fiber all is arranged in the described rigid container.
Further, above-mentioned optical fibre cable towing rectifier also can have following characteristics: the structure of the sensing Duan Yitong core series connection of described signal arm optical fiber and reference arm optical fiber is wrapped on the periphery of described rigid container.
Further, above-mentioned optical fibre cable towing rectifier also can have following characteristics: be provided with a flexible lining between the sensing section of described signal arm optical fiber and the described rigid container, and be provided with a rigid liner between the sensing section of described reference arm optical fiber and the described rigid container.
Further, above-mentioned optical fibre cable towing rectifier also can have following characteristics: the optical fiber of described signal arm and reference arm all adopts non-polarization-maintaining single-mode fiber.
Further, above-mentioned optical fibre cable towing rectifier also can have following characteristics: described signal arm optical fiber adopts the optical fiber more responsive to acoustic pressure than common non-polarization-maintaining single-mode fiber.
Further, above-mentioned optical fibre cable towing rectifier also can have following characteristics: also comprise two fibre-optical splices that are connected by first, second fiber coupler of one road optical fiber and this respectively, described first, second fiber coupler is identical, and the other end of described two fibre-optical splices can connect light source or photodetector respectively.
Further, above-mentioned optical fibre cable towing rectifier also can have following characteristics: described signal arm optical fiber is identical with the total length of reference arm optical fiber.
Further, above-mentioned optical fibre cable towing rectifier also can have following characteristics: the sensing section of described reference arm optical fiber is also wrapped attached outward one every pugging.
Further, above-mentioned optical fibre cable towing rectifier also can have following characteristics: its outside surface has coated one deck sound transmitting rubber layer.
As from the foregoing, the fiber coupler of optical fibre cable towing rectifier of the present invention and conductive sections optical fiber all are built in the cavity in the rigid support tube, and sound pressure signal concentrates on the sensing section optical fiber the effect of whole wave detector, has improved the stability and the signal to noise ratio (S/N ratio) of system.Further, reference arm optical fiber and signal arm optical fiber adopt with the core cascaded structure, have improved the signal to noise ratio (S/N ratio) of wave detector; Signal arm optical fiber adopts the special optical fiber to the acoustic pressure sensitivity, is wrapped on the flexible lining, and at the attached pugging of reference arm optical fiber outsourcing, and be wrapped on the rigid liner, the improvement of these structures and material can improve the Detection of weak ability; Two fibre-optical probes of wave detector of the present invention also can have reciprocity, connect simply, are convenient to maintenance.
Description of drawings
Fig. 1 is typical fibre optic interferometer theory diagram.
Fig. 2 is the cross-sectional view of embodiment of the invention optical fibre cable towing rectifier.
Embodiment
Fig. 2 shows the cross-sectional view of present embodiment optical fibre cable towing rectifier, and its critical piece comprises: rigid support tube 1, bottom 2, sleeve 3, top cover 4, rigid liner 5, flexible lining 6, pugging 7, sound transmitting rubber floor 8, reference arm optical fiber 9, signal arm optical fiber 10, first fiber coupler 11, second fiber coupler 12, first fibre-optical splice 13, second fibre-optical splice 14, first via optical fiber 15, the second road optical fiber 16, coupling mechanism fixed head 17.Wherein:
The rigid support tube 1 of hollow is connected with bottom 2, sleeve 3 respectively by screw, whole wave detector is play support and the linking effect.Have groove 18 on rigid support tube 1 sidewall, optical fiber can be by the cavity of groove 18 in tube through outside the tube.Sleeve 3 and top cover 4 are connected by screw.Sleeve 3 is a hollow, has circular hole 19 on the top cover 4 and passes for optical fiber.Rigid support tube 1, bottom 2, sleeve 3 and top cover 4 have constituted the rigid container cylindraceous that leaves the optical fiber gateway jointly.
The internal diameter of rigid liner 5 and flexible lining 6 equates so that it is close to the external diameter of rigid support tube 1 is approaching.Flexible lining 6 usefulness flexible materials (as rubber, nylon, Polycarbonate plastics) are made, and the signal arm optical fiber of gathering as acoustical signal 10 twines on it, and flexible lining 6 helps to strengthen the influence of sound field to signal arm optical fiber 10.Rigid liner 5 usefulness metals or other rigid materials are made, and reference arm optical fiber 9 (with reference to usefulness, not with the acoustical signal effect) twines on it, and rigid liner 5 helps sound field is reduced to minimum to the influence of reference arm optical fiber 9.
Signal arm optical fiber 10 and reference arm optical fiber 9 are wrapped in the optical fiber that part on flexible lining 6 and the rigid liner 5 belongs to the sensing section, two branch roads that the left end of the sensing section of two-way optical fiber passes second fiber coupler, 12 left ends in groove 18 and the cavity respectively link to each other respectively, two branch roads that right-hand member then passes first fiber coupler, 11 left ends in groove 18 and the cavity link to each other the optical fiber that belongs to conductive sections between the sensing section fiber-to-fiber coupling mechanism respectively.The built-in coupling mechanism fixed head 17 of first, second fiber coupler 11 and 12 usefulness is fixed in the cavity, and 17 of fixed heads are fixed on the rigid support tube 1 with methods such as gluing or sunk screws.
First, second fiber coupler 11 links to each other with first, second road optical fiber 15,16 respectively with 12 right-hand member branch, and the perforate that first, second road optical fiber 15,16 passes on sleeve 3 and the top cover 4 links to each other with 14 with first, second fibre-optical splice 13 respectively.First, second fibre- optical splice 13 and 14 structurally is reciprocity, and they are used to connect light source (laser instrument) and photodetector.
Be each functions of components of clearer explanation and relation, anti-first fibre-optical splice 13 of establishing is connected with wave detector light source outward, second fibre-optical splice 14 just should be connected with photodetector, then the effect of first fiber coupler 11 is exactly that light signal with light source is divided into two-way and sends into signal arm optical fiber 10 and reference arm optical fiber 9 respectively, and the effect of second fiber coupler 12 is with the light compositing one tunnel of signal arm optical fiber 10 and reference arm optical fiber 9 and interferes, interference light imports photodetector from the second road optical fiber 16 into through second fibre-optical splice 14, and photodetector transfers light signal to electric current.This electric current comprises the information of sound field pressure signal, can handle by subsequent process circuit to obtain.
The conduction optical fiber and the sensor fibre that use in the present embodiment are non-polarization-maintaining single-mode fiber, the signal arm optical fiber 10 that is wrapped on the flexible lining 6 adopts a kind of special optical fiber to the sound pressure signal sensitivity, and the overlay of its overlay and common non-polarization-maintaining single-mode fiber all has different aspect material and thickness.Be wrapped in rigid liner 5 outer reference arm optical fiber 9 and be common non-polarization-maintaining single-mode fiber.
In the present invention, the total length of the two-way optical fiber between first fiber coupler 11 and second fiber coupler 12 should keep identical, and error is in the millimeter magnitude.In addition, the thin pugging 7 that reference arm optical fiber 9 is outer also to be wrapped a sound-proof material attached and make is with the extraneous acoustic pressure of weakening effect on reference arm optical fiber 9.The outside surface of wave detector is close to and is configured as to sound transmitting rubber layer 8 and signal arm optical fiber 10 and pugging 7; play protection and sealing function to wave detector inner structure and optical fiber, extraneous acoustic pressure of while can almost nondestructively act on the signal arm optical fiber 10 by sound transmitting rubber layer 8 and cause the variation of light phase.
In sum, the present embodiment optical fibre cable towing rectifier has the following advantages:
1) fiber coupler of present embodiment and conductive sections optical fiber all are built in the cavity in the rigid support tube, Wave detector consists of the integral body of a sealing. So that extraneous acoustic pressure and various interference are to fiber coupler and conduction The effect of section optical fiber can be ignored, and sound pressure signal concentrates on sensing section optical fiber to the effect of whole wave detector On, improved Systems balanth and signal to noise ratio.
2) reference arm of present embodiment and signal arm adopt with the core cascaded structure, because the space phase of position Like property, external interference and noise signal are basically identical to the impact of reference optical fiber and sensor fibre, then its work With can substantially being eliminated, improved the signal to noise ratio of wave detector. For example, ambient temperature changes and shakes at random The moving optical fiber that all can cause produces the random phase noise, because the space symmetr of the cascaded structure that the present invention adopts The property and similitude, that the phase place that signal arm and reference arm optical fiber produce changes is almost identical, like this interference light Phase place just do not change basically, thereby reached the insensitive of to external world temperature and random vibration, reduces Noise.
3) the signal arm Optical Fiber Winding of present embodiment wave detector helps to strengthen sound field on flexible lining Influence to optical fiber; And reference arm optical fiber is wrapped on the rigid liner, helps sound field optical fiber Impact reduce to minimum. In addition, signal arm optical fiber adopts the optical fiber high to the acoustic pressure susceptibility, and in reference Arm optical fiber adopts the attached puigging of bag, and the improvement of these structures and material has reduced to be applied to reference arm optical fiber On acoustic pressure so that the present embodiment wave detector compares with other phase interference type optical fiber detectors, in effect In the identical situation of fiber lengths, sensitivity is higher, has improved the Detection of Weak Signals ability.
4) the present embodiment detector structure is integrated, and small volume links to each other with light source and photoelectric detector Two fibre-optical splices have reciprocity, connect simple. As going wrong, can change easily in the application, Be convenient to maintenance.
5) the used assembly of this wave detector and material are all more common, and cost is low, make large-scale group Battle array and practicality become possibility.
Claims (9)
1, a kind of optical fibre cable towing rectifier, comprise a rigid container, first fiber coupler, second fiber coupler, and two ends are connected respectively to the signal arm optical fiber and the reference arm optical fiber of this first, second fiber coupler, it is characterized in that, described rigid container is the cylindric obturator that leaves the optical fiber gateway, the sensing section of described signal arm optical fiber and reference arm optical fiber is wrapped in outside the described rigid container, and the conductive sections of described first, second fiber coupler and described signal arm optical fiber and reference arm optical fiber all is arranged in the described rigid container.
2, optical fibre cable towing rectifier as claimed in claim 1 is characterized in that, the structure of the sensing Duan Yitong core series connection of described signal arm optical fiber and reference arm optical fiber is wrapped on the periphery of described rigid container.
3, optical fibre cable towing rectifier as claimed in claim 1 or 2, it is characterized in that, be provided with a flexible lining between the sensing section of described signal arm optical fiber and the described rigid container, and be provided with a rigid liner between the sensing section of described reference arm optical fiber and the described rigid container.
4, optical fibre cable towing rectifier as claimed in claim 1 is characterized in that, the optical fiber of described signal arm and reference arm all adopts non-polarization-maintaining single-mode fiber.
5, optical fibre cable towing rectifier as claimed in claim 4 is characterized in that, described signal arm optical fiber adopts the optical fiber more responsive to acoustic pressure than common non-polarization-maintaining single-mode fiber.
6, optical fibre cable towing rectifier as claimed in claim 1, it is characterized in that, also comprise two fibre-optical splices that are connected by first, second fiber coupler of one road optical fiber and this respectively, described first, second fiber coupler is identical, and the other end of described two fibre-optical splices can connect light source or photodetector respectively.
7, optical fibre cable towing rectifier as claimed in claim 1 is characterized in that, described signal arm optical fiber is identical with the total length of reference arm optical fiber.
8, optical fibre cable towing rectifier as claimed in claim 1 is characterized in that, the sensing section of described reference arm optical fiber is also wrapped attached outward one every pugging.
9, optical fibre cable towing rectifier as claimed in claim 1 is characterized in that, its outside surface has coated one deck sound transmitting rubber layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510055607 CN1289922C (en) | 2005-03-18 | 2005-03-18 | Optical fibre cable towing rectifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510055607 CN1289922C (en) | 2005-03-18 | 2005-03-18 | Optical fibre cable towing rectifier |
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| Publication Number | Publication Date |
|---|---|
| CN1651936A CN1651936A (en) | 2005-08-10 |
| CN1289922C true CN1289922C (en) | 2006-12-13 |
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| CN 200510055607 Expired - Fee Related CN1289922C (en) | 2005-03-18 | 2005-03-18 | Optical fibre cable towing rectifier |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106323439B (en) * | 2016-08-01 | 2020-07-14 | 北京航天控制仪器研究所 | Time-delay optical fiber and reference optical fiber packaging structure for optical fiber hydrophone modulation system |
| CN107063435B (en) * | 2017-06-21 | 2019-04-16 | 中国人民解放军国防科学技术大学 | A kind of fibre optic hydrophone probe internally provided based on the full light carrier modulator of micro-nano fiber |
| CN107677357A (en) * | 2017-08-18 | 2018-02-09 | 北京航天控制仪器研究所 | A kind of symmetrical expression bobbin-type fiber optic hydrophone unit of resisting temperature drift |
| CN107702786B (en) * | 2017-08-31 | 2020-09-18 | 北京航天控制仪器研究所 | Interferometric optical fiber hydrophone probe for array |
| CN112965193A (en) * | 2021-02-04 | 2021-06-15 | 广州海洋地质调查局 | Ocean seismic streamer based on DAS optical fiber |
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Granted publication date: 20061213 Termination date: 20170318 |