CN105277273A - Interferometric optical fiber hydrophone resisting strong electromagnetic interference and manufacturing method thereof - Google Patents
Interferometric optical fiber hydrophone resisting strong electromagnetic interference and manufacturing method thereof Download PDFInfo
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- CN105277273A CN105277273A CN201510703117.0A CN201510703117A CN105277273A CN 105277273 A CN105277273 A CN 105277273A CN 201510703117 A CN201510703117 A CN 201510703117A CN 105277273 A CN105277273 A CN 105277273A
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Abstract
The invention discloses an interferometric optical fiber hydrophone resisting strong electromagnetic interference and a manufacturing method thereof. The hydrophone comprises a hydrophone casing. A sensing coil is arranged in the hydrophone casing. One end of an optical fiber which winds around the sensing coil is connected with an external optical fiber through a first coupler. The other end of the optical fiber which winds around the sensing coil is connected with a Faraday rotation mirror through a second coupler. The sensing coil, the first coupler and the second coupler are encapsulated in a structure matrix. The hydrophone casing is made of a non-metallic material. The structure matrix is encapsulated in the hydrophone casing. The Faraday rotator mirror and the external optical fiber are located outside a measured strong electromagnetic environment. Other parts of the hydrophone are located within the measured strong electromagnetic environment. According to the interferometric optical fiber hydrophone resisting strong electromagnetic interference and the manufacturing method thereof, which are provided by the invention, the Faraday rotator mirror is moved outside the measured strong electromagnetic environment; the hydrophone is completely made of the non-metallic material; and the problem of difficult acoustic signal sensing in a high magnetic field and high electric field environment can be solved.
Description
Technical field
The present invention relates to a kind of fibre optic hydrophone and preparation method thereof, particularly relate to interference type optical fiber hydrophone of a kind of anti-strong electromagnetic and preparation method thereof.
Background technology
Fibre optic hydrophone is a kind of high-sensitive sound pressure sensor, is a member in sonar system.Owing to there are corrosion-resistant, non-transformer, many reference amounts, be easy to extensive large span networking, remote Real-Time Monitoring can be realized, the advantages such as all weather operations, instead of traditional piezoelectric type underwater sound sensor-based system gradually, be widely used in seafari field.
Traditional fibre optic hydrophone is mainly based on the interference type optical fiber hydrophone of Michelson interferometer.Fig. 1 is conventional interference type nautical receiving set cellular construction.In this kind of light channel structure, the optical fiber of interferometer one arm is coiled on the elastic body of acoustic sensing, composition sensing coil.When sensing coil, under acoustic impacts, dilation occurs, the optical path difference linear change thereupon of interferometer two-arm, the linear change of phase place of final output optical signal.Carry out phase demodulating by rear end, get final product restoring acoustical signal.In order to solve the polarization decay problem of original Michelson interferometer, traditional interference type optical fiber hydrophone all uses faraday's rotating mirror to replace common catoptron, by controlling light path polarization state, realizes polarization compensation.Because faraday's rotating mirror inside exists magnet, magneto-optic induction is relied on to control polarization state.Although insensitive to the low-intensity magnetic field electric field in the application of the overwhelming majority, under the impact of high-intensity magnetic field and highfield, faraday's rotating mirror cannot stability contorting polarization state, causes signal fluctuation, introduces unnecessary noise.Therefore traditional interference type optical fiber hydrophone normally can not work in strong electromagnetic environment.
Except traditional interference type optical fiber hydrophone, grating type optical fiber sensing technology was developed rapidly in Underwater Detection field in recent years.Optical fiber grating type optical fiber hydrophone is mainly divided into two kinds: fiber grating pair is as the interference type optical fiber hydrophone of catoptron and fiber laser hydrophone.As shown in Figure 2, optical fiber grating type optical fiber hydrophone adopts fiber grating 11 and the circulator 12 of co-wavelength; Serious polarization decay problem is there is in fiber grating pair as the interference type optical fiber hydrophone of catoptron.Fiber laser hydrophone, such as DFB (distributed feedback) fiber laser hydrophone, as shown in Figure 3, two DFB fiber gratings 13 connect isolator 15 by 980/1550 wavelength division multiplexer 14,980/1550 wavelength division multiplexer 14 is connected with 980 pumpings 16, dynamic range of signals and sound pressure sensitivity less, technology is immature.Therefore grating type optical fiber nautical receiving set exists with a certain distance from extensively using.
Except the restriction at optical technical field, existing fibre optic hydrophone physical construction is all metal material, at strong electromagnetic environment, in such as operating transformer, has very large potential safety hazard.Therefore a kind of fibre optic hydrophone that normally can work safely in strong electromagnetic environment is lacked at present.
Summary of the invention
Technical matters to be solved by this invention is to provide interference type optical fiber hydrophone of a kind of anti-strong electromagnetic and preparation method thereof, can solve a difficult problem for acoustical signal sensing under highfield, high electric field environment.
The present invention solves the problems of the technologies described above the interference type optical fiber hydrophone that the technical scheme adopted is to provide a kind of anti-strong electromagnetic, comprise nautical receiving set shell, sensing coil is provided with in described nautical receiving set shell, wherein, the optical fiber one end of described sensing coil coiling setting is connected with external fiber by the first coupling mechanism, the optical fiber other end described sensing coil coiling setting is connected with faraday's rotating mirror by the second coupling mechanism, described sensing coil, first coupling mechanism, second coupler package is in structural matrix, described nautical receiving set shell is non-metallic material, described structural matrix is encapsulated in nautical receiving set shell.Describedly be arranged on faraday's rotating mirror outside nautical receiving set shell and external fiber is positioned at outside tested strong electromagnetic environment, nautical receiving set remainder is positioned at tested strong electromagnetic environment.
The interference type optical fiber hydrophone of above-mentioned anti-strong electromagnetic, wherein, described first coupling mechanism, second coupling mechanism is 2 × 2 coupling mechanisms, two input ends of described first coupling mechanism connect external fiber respectively, an output terminal of described first coupling mechanism is connected with the optical fiber one end of sensing coil coiling setting, another output terminal of described first coupling mechanism is connected with an input end of the second coupling mechanism, another input end of described second coupling mechanism is connected with optical fiber other end sensing coil coiling setting, an output terminal of described second coupling mechanism connects faraday's rotating mirror, another output terminal of described second coupling mechanism connects unglazed end, described unglazed end is encapsulated in described structural matrix.
The interference type optical fiber hydrophone of above-mentioned anti-strong electromagnetic, wherein, incident light is fully decayed after described unglazed end process, prevents the impact of fiber end face reflection on signal.
The interference type optical fiber hydrophone of above-mentioned anti-strong electromagnetic, wherein, the optical fiber of described faraday's rotating mirror, external fiber and nautical receiving set shell junction is located in optical cable.
The present invention, for solving the problems of the technologies described above the method for making of the interference type optical fiber hydrophone also providing a kind of anti-strong electromagnetic, wherein, comprises the steps: a) fiber reel to be formed sensing coil on elastic body; B) sensing coil is fixed on structural matrix, optical fiber is introduced in structural matrix simultaneously and weld; C) the optical fiber one end of sensing coil coiling setting is connected an output terminal of the first coupling mechanism, the other end connects an input end of the second coupling mechanism, another output terminal of described first coupling mechanism is connected with another input end of the second coupling mechanism, two input ends of described first coupling mechanism and an output terminal of the second coupling mechanism are drawn by optical cable, another output terminal of described second coupling mechanism connects unglazed end; D) light path after connection is encapsulated in structural matrix, finally structural matrix is encapsulated in nautical receiving set shell.
The method for making of the interference type optical fiber hydrophone of above-mentioned anti-strong electromagnetic, wherein, on described sensing coil, fiber lengths is the optical path difference of interferometer two-arm.
The present invention contrasts prior art following beneficial effect: interference type optical fiber hydrophone of anti-strong electromagnetic provided by the invention and preparation method thereof, hydrophone structure is innovated, faraday's rotating mirror is moved on to outside tested strong electromagnetic environment, and adopt non-metallic material to encapsulate shell, thus a difficult problem for acoustical signal sensing under highfield, high electric field environment can be solved.
Accompanying drawing explanation
Fig. 1 is the existing interference type optical fiber hydrophone structural representation based on Michelson interferometer;
Fig. 2 is the interference type optical fiber hydrophone structural representation of existing employing fiber grating pair;
Fig. 3 is existing DFB fiber laser hydrophone structural representation;
Fig. 4 is the interference type optical fiber hydrophone structural representation of the anti-strong electromagnetic of the present invention;
Fig. 5 is existing interference type optical fiber hydrophone noise schematic diagram;
Fig. 6 is existing interference type optical fiber hydrophone noise spectrum schematic diagram;
Fig. 7 is the interference type optical fiber hydrophone noise schematic diagram of the anti-strong electromagnetic of the present invention;
Fig. 8 is the interference type optical fiber hydrophone noise spectrum schematic diagram of the anti-strong electromagnetic of the present invention.
In figure:
The unglazed end of 1 sensing coil 2 coupling mechanism 3
4 faraday's rotating mirror 5 optical cable 6 structural matrixs
7 external fiber 8 first coupling mechanism 9 second coupling mechanisms
10 nautical receiving set shell 11 fiber grating 12 circulators
13DFB fiber grating 14980/1550 wavelength division multiplexer 15 isolator
16980 pumpings
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 4 is the interference type optical fiber hydrophone structural representation of the anti-strong electromagnetic of the present invention.
Refer to Fig. 4, the interference type optical fiber hydrophone of anti-strong electromagnetic provided by the invention, comprise nautical receiving set shell 10, sensing coil 1 is provided with in described nautical receiving set shell 10, wherein, the optical fiber one end of described sensing coil 1 coiling setting is connected with external fiber 7 by the first coupling mechanism 8, the optical fiber other end described sensing coil 1 coiling setting is connected with faraday's rotating mirror 4 by the second coupling mechanism 9, described sensing coil 1, first coupling mechanism 8, second coupling mechanism 9 is encapsulated in structural matrix, described nautical receiving set shell 10 is non-metallic material, described structural matrix 6 is encapsulated in nautical receiving set shell.Describedly be arranged on faraday's rotating mirror 4 outside nautical receiving set shell 10 and external fiber 7 is positioned at outside tested strong electromagnetic environment, nautical receiving set remainder is positioned at tested strong electromagnetic environment.
The interference type optical fiber hydrophone of anti-strong electromagnetic provided by the invention, described first coupling mechanism 8, second coupling mechanism 9 is 2 × 2 coupling mechanisms, two input ends of described first coupling mechanism connect external fiber 7 respectively, an output terminal of described first coupling mechanism 8 is connected with the optical fiber one end of sensing coil 1 coiling setting, another output terminal of described first coupling mechanism 8 is connected with an input end of the second coupling mechanism 9, another input end of described second coupling mechanism 9 is connected with optical fiber other end sensing coil 1 coiling setting, an output terminal of described second coupling mechanism 9 connects faraday's rotating mirror 4, another output terminal of described second coupling mechanism 9 connects unglazed end 3, described unglazed end 3 is encapsulated in structural matrix 6, after wherethrough reason, incident light is fully decayed, prevent the impact of fiber end face reflection on signal.Described faraday's rotating mirror 4, external fiber 7 are located in optical cable 5 with the optical fiber of nautical receiving set shell 10 junction.
The present invention also provides a kind of method for making of interference type optical fiber hydrophone of anti-strong electromagnetic, wherein, comprises the steps:
A) fiber reel is formed sensing coil 1 on elastic body;
B) sensing coil 1 is fixed on structural matrix, optical fiber is introduced in structural matrix simultaneously and weld; On described sensing coil 1, fiber lengths is the optical path difference of interferometer two-arm;
C) the optical fiber one end of sensing coil 1 coiling setting is connected an output terminal of the first coupling mechanism 8, the other end connects an input end of the second coupling mechanism 9, another output terminal of described first coupling mechanism 8 is connected with another input end of the second coupling mechanism 9, two input ends of described first coupling mechanism 8 and an output terminal of the second coupling mechanism 9 are drawn by optical cable 5, another output terminal of described second coupling mechanism 9 connects unglazed end 3;
D) light path after connection is encapsulated in structural matrix, finally structural matrix is encapsulated in nautical receiving set shell.
Below traditional interference type optical fiber hydrophone and novel optical fiber nautical receiving set are together arranged in high-power transformer, monitor.Fig. 5 and Fig. 6 is zero load (transformer big current low-voltage) noise and the frequency spectrum of traditional interference type optical fiber hydrophone, and Fig. 7 and Fig. 8 is idle operator lamp and the frequency spectrum of novel optical fiber nautical receiving set.Obviously traditional interference type optical fiber hydrophone receives interference (500Hz and frequency multiplication thereof) in the strong-electromagnetic field that big current produces, and fibre optic hydrophone noise provided by the invention is uninfluenced.Result shows, the fibre optic hydrophone that the present invention proposes normally can work under high-intensity magnetic field, strong electric field environment.
Interference type optical fiber hydrophone of anti-strong electromagnetic provided by the invention and preparation method thereof, faraday's rotating mirror 4 is moved on to outside tested strong electromagnetic environment, and adopt non-metallic material to encapsulate shell, concrete advantage is as follows: 1, employ follow-on Mach-Zehnder interferometer light path innovatively, be different from Michelson interferometer, faraday's rotating mirror of follow-on Mach-Zehnder interferometer is without the need to inner at unit.Except connecting one section of common optical fiber of faraday's rotating mirror, all the other optical fiber are all enclosed in unit inside, while suppression residual jitter and polarization decay, ensure that faraday's rotating mirror is in outside tested strong electromagnetic environment, solve the problem of faraday's rotating mirror by magnetic field, electric jamming.2, the novel nonmetallic materials physical construction of autonomous Design.Select the nonmetallic materials with enough hardness, design suitable sensor mechanical structure, while support Backup lightpath, significantly improve the anti-electromagnetic performance of fibre optic hydrophone.3, the light path devices of not metal-containing material is employed.While guarantee nautical receiving set optical property, significantly improve the anti-electromagnetic performance of fibre optic hydrophone.
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is when being as the criterion of defining with claims.
Claims (6)
1. the interference type optical fiber hydrophone of an anti-strong electromagnetic, comprise nautical receiving set shell (10), sensing coil (1) is provided with in described nautical receiving set shell (10), it is characterized in that, optical fiber one end that the upper coiling of described sensing coil (1) is arranged is connected with external fiber (7) by the first coupling mechanism (8), and the optical fiber other end that the upper coiling of described sensing coil (1) is arranged is connected with faraday's rotating mirror (4) by the second coupling mechanism (9); Described sensing coil (1), the first coupling mechanism (8), the second coupling mechanism (9) are encapsulated in structural matrix (6), described nautical receiving set shell (10) is non-metallic material, and described structural matrix (6) is encapsulated in nautical receiving set shell; Describedly be arranged on the outer faraday's rotating mirror (4) of nautical receiving set shell (10) and external fiber (7) is positioned at outside tested strong electromagnetic environment, nautical receiving set remainder is positioned at tested strong electromagnetic environment.
2. the interference type optical fiber hydrophone of anti-strong electromagnetic as claimed in claim 1, it is characterized in that, described first coupling mechanism (8), second coupling mechanism (9) is 2 × 2 coupling mechanisms, two input ends of described first coupling mechanism connect external fiber (7) respectively, an output terminal of described first coupling mechanism (8) above coils the optical fiber one end arranged with sensing coil (1) and is connected, another output terminal of described first coupling mechanism (8) is connected with an input end of the second coupling mechanism (9), another input end of described second coupling mechanism (9) above coils the optical fiber other end arranged with sensing coil (1) and is connected, an output terminal of described second coupling mechanism (9) connects faraday's rotating mirror (4), another output terminal of described second coupling mechanism (9) is unglazed end, described unglazed end (3) is encapsulated in described structural matrix (6).
3. the interference type optical fiber hydrophone of anti-strong electromagnetic as claimed in claim 2, is characterized in that, incident light is fully decayed after described unglazed end (3) process, prevents the impact of fiber end face reflection on signal.
4. the interference type optical fiber hydrophone of anti-strong electromagnetic as claimed in claim 1, is characterized in that, described faraday's rotating mirror (4) is located in optical cable (5) with the optical fiber of nautical receiving set shell (10) junction.
5. a method for making for the interference type optical fiber hydrophone of anti-strong electromagnetic, is characterized in that, comprises the steps:
A) fiber reel is formed sensing coil (1) on elastic body;
B) sensing coil (1) is fixed on structural matrix (6), optical fiber is introduced in structural matrix (6) simultaneously and weld;
C) optical fiber one end that upper for sensing coil (1) coiling is arranged is connected an output terminal of the first coupling mechanism (8), the other end connects an input end of the second coupling mechanism (9), another output terminal of described first coupling mechanism (8) is connected with another input end of the second coupling mechanism (9), drawn by optical cable (5) by an output terminal of two input ends of described first coupling mechanism (8) and the second coupling mechanism (9), another output terminal of described second coupling mechanism (9) connects unglazed end (3);
D) light path after connection is encapsulated in structural matrix (6), finally structural matrix is encapsulated into (10) in nautical receiving set shell.
6. the method for making of the interference type optical fiber hydrophone of anti-strong electromagnetic as claimed in claim 5, is characterized in that, the upper fiber lengths of described sensing coil (1) is the optical path difference of interferometer two-arm.
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| CN106969710A (en) * | 2017-05-26 | 2017-07-21 | 四川瑞丰锻造有限公司 | It is easy to the stable type optical splitter of detection |
| CN106979751A (en) * | 2017-05-26 | 2017-07-25 | 四川瑞丰锻造有限公司 | A kind of optical splitter |
| CN107255735A (en) * | 2017-06-27 | 2017-10-17 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | A kind of three-dimensional fiber acceleration transducer of anti-strong electromagnetic |
| CN110006517A (en) * | 2019-03-26 | 2019-07-12 | 中国船舶重工集团公司第七一五研究所 | Air backing is nonelastic body fiber optic hydrophone unit and processing method |
| CN110006519A (en) * | 2019-03-26 | 2019-07-12 | 中国船舶重工集团公司第七一五研究所 | The air backing fiber optic hydrophone unit of integrated sensitization structure |
| CN110488346A (en) * | 2019-08-26 | 2019-11-22 | 青岛海洋地质研究所 | A kind of vertical cable system of marine seismic prospectiong based on fibre optic hydrophone |
| CN110501062A (en) * | 2019-05-31 | 2019-11-26 | 太原理工大学 | A kind of distribution type fiber-optic sound sensor and positioning system |
| CN110631684A (en) * | 2019-10-23 | 2019-12-31 | 吉林大学 | Sensing probe, optical fiber interference device and method for inhibiting polarization fading |
| CN111323613A (en) * | 2020-03-21 | 2020-06-23 | 哈尔滨工程大学 | Vector optical fiber sensing probe based on optical fiber interferometer and underground vector accelerometer |
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| CN106969710A (en) * | 2017-05-26 | 2017-07-21 | 四川瑞丰锻造有限公司 | It is easy to the stable type optical splitter of detection |
| CN106979751A (en) * | 2017-05-26 | 2017-07-25 | 四川瑞丰锻造有限公司 | A kind of optical splitter |
| CN107255735A (en) * | 2017-06-27 | 2017-10-17 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | A kind of three-dimensional fiber acceleration transducer of anti-strong electromagnetic |
| CN110006517A (en) * | 2019-03-26 | 2019-07-12 | 中国船舶重工集团公司第七一五研究所 | Air backing is nonelastic body fiber optic hydrophone unit and processing method |
| CN110006519A (en) * | 2019-03-26 | 2019-07-12 | 中国船舶重工集团公司第七一五研究所 | The air backing fiber optic hydrophone unit of integrated sensitization structure |
| CN110501062A (en) * | 2019-05-31 | 2019-11-26 | 太原理工大学 | A kind of distribution type fiber-optic sound sensor and positioning system |
| CN110501062B (en) * | 2019-05-31 | 2021-09-03 | 太原理工大学 | Distributed optical fiber sound sensing and positioning system |
| CN110488346A (en) * | 2019-08-26 | 2019-11-22 | 青岛海洋地质研究所 | A kind of vertical cable system of marine seismic prospectiong based on fibre optic hydrophone |
| CN110631684A (en) * | 2019-10-23 | 2019-12-31 | 吉林大学 | Sensing probe, optical fiber interference device and method for inhibiting polarization fading |
| CN110631684B (en) * | 2019-10-23 | 2024-02-13 | 吉林大学 | Sensing probe, optical fiber interference device and method for inhibiting polarization fading |
| CN111323613A (en) * | 2020-03-21 | 2020-06-23 | 哈尔滨工程大学 | Vector optical fiber sensing probe based on optical fiber interferometer and underground vector accelerometer |
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