CN119270334A - A marine seismic acoustic monitoring system based on optical fiber coherent sensing technology - Google Patents
A marine seismic acoustic monitoring system based on optical fiber coherent sensing technology Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 77
- 238000012544 monitoring process Methods 0.000 title claims abstract description 35
- 238000005516 engineering process Methods 0.000 title claims abstract description 22
- 230000001427 coherent effect Effects 0.000 title claims abstract description 16
- 238000012545 processing Methods 0.000 claims abstract description 16
- 238000004891 communication Methods 0.000 claims abstract description 7
- 230000008054 signal transmission Effects 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 72
- 239000000463 material Substances 0.000 claims description 10
- 239000010409 thin film Substances 0.000 claims description 5
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
- 229910052691 Erbium Inorganic materials 0.000 claims description 4
- 239000004917 carbon fiber Substances 0.000 claims description 4
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 abstract description 23
- 230000035945 sensitivity Effects 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract description 2
- 230000006978 adaptation Effects 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 238000005086 pumping Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 238000013480 data collection Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
- G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
- G01V1/186—Hydrophones
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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Abstract
本发明公开了一种基于光纤相干传感技术的海洋地震声学监测系统，涉及海洋地震声学监测技术领域；为了解决现有技术存在的缺陷问题；具体包括中央处理器、用于采集声学信息并处理分析的信息采集单元和用于实现声学信号传输的信号发射单元，所述信号发射单元分别与信息采集单元和中央处理器通信连接；所述信息采集单元为多孔声呐球本体，多孔声呐球本体的上方设置有浮标。本发明在恶劣环境仍然可靠工作，采用的光路具有中心波长动态自适应的特性，可以有效地抑制跳模现象，从而稳定激光光源，提高光信噪比，以及与光路相配套相适应的声呐阵列板，用以提高海洋地震监测的灵敏度，工作稳定且布设及使用均较为方便，成本相对交底易于推广。
The present invention discloses a marine earthquake acoustic monitoring system based on optical fiber coherent sensing technology, which relates to the technical field of marine earthquake acoustic monitoring; in order to solve the defects existing in the prior art; specifically includes a central processing unit, an information collection unit for collecting acoustic information and processing and analyzing, and a signal transmitting unit for realizing acoustic signal transmission, wherein the signal transmitting unit is respectively connected to the information collection unit and the central processing unit in communication; the information collection unit is a porous sonar ball body, and a buoy is arranged above the porous sonar ball body. The present invention can still work reliably in harsh environments, and the optical path used has the characteristic of dynamic adaptation of the central wavelength, which can effectively suppress the mode hopping phenomenon, thereby stabilizing the laser light source and improving the optical signal-to-noise ratio, and the sonar array board matched and adapted to the optical path is used to improve the sensitivity of marine earthquake monitoring, and the work is stable and the deployment and use are relatively convenient, and the cost is relatively easy to promote.
Description
Technical Field
The invention relates to the technical field of marine seismic acoustic monitoring, in particular to a marine seismic acoustic monitoring system based on an optical fiber coherent sensing technology.
Background
In marine development, acoustic technology is the only effective means for exploring the seafloor, and widely used seismic prospecting instruments are one example of the application of acoustic technology. The method for researching the crust structure and the activity thereof in a large range by utilizing the submarine seismograph to record the longitudinal and transverse body waves and the microseisms of natural earthquakes (the earthquakes which are developed to record the artificially excited earthquakes at present) is called submarine earthquake observation. Monitoring the change in the submarine fiber optic cable induced by an earthquake represents a new means of discovering the earthquake, making it possible to sense the earthquake without installing new submarine equipment, to estimate the "disturbance" signal in the submarine fiber optic cable generated by the earthquake, the method involving the detection of the so-called optical phase transitions in the fiber optic cable triggered by the seismic waves, effectively detecting the seismic activity and related parameters, the effect of which is comparable to that of a local seismometer, which can be used in areas where it is otherwise difficult to monitor the earthquake (including the dive zone or the remote ocean area where the seismometer is lacking).
At present, the earthquake sensor is based on a piezoelectric ceramic crystal as a receiving sensor, an integrated circuit and a power supply system, and adopts a sealed shell for protection as a main means of marine earthquake detection. The sensor has a complex structure, solves the problems of sealing and the like, is influenced by the submergence depth and the long endurance, is required to be laid as a deep sea fixed anchor chain mode, has high cost and is inconvenient to use. For this reason, we propose a marine seismic acoustic monitoring system based on optical fiber coherent sensing technology.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a marine seismic acoustic monitoring system based on an optical fiber coherent sensing technology.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The marine seismic acoustic monitoring system based on the optical fiber coherent sensing technology comprises a central processing unit, an information acquisition unit for acquiring acoustic information and processing and analyzing and a signal transmitting unit for realizing acoustic signal transmission, wherein the signal transmitting unit is respectively in communication connection with the information acquisition unit and the central processing unit;
and an acoustic sensing optical fiber is arranged in the porous sonar ball body.
Preferably, the porous sonar ball body is made of a lightweight carbon fiber material with a porous structure;
the buoy is one of a light high-strength buoyancy material and a natural buoyancy material.
Preferably, the acoustic sensing optical fiber comprises a pumping source, an acousto-optic modulator, an erbium-doped optical fiber amplifier, a wavelength division multiplexer, a first circulator, a Michelson reference grating, a multi-ring resonance component, a second circulator, a sonar array plate, an avalanche photodiode and a photoelectric detector;
the pumping source is a narrow linewidth laser.
Preferably, one end of the pumping source is connected with the input port of the acousto-optic modulator through a single mode fiber A, and the output port of the acousto-optic modulator is connected with the input port of the erbium-doped optical fiber amplifier through a single mode fiber B.
Preferably, the output port of the erbium-doped fiber amplifier is connected with the input port of the wavelength division multiplexer through a single mode fiber C, and the output port of the wavelength division multiplexer is connected with the input port of the circulator I through a single mode fiber D.
Preferably, the output port of the first circulator is connected with the input port of the Michelson reference grating through a single-mode fiber E, and the output port of the Michelson reference grating is connected with the input port of the second circulator through a multi-ring resonance assembly.
Preferably, the multi-ring resonance assembly comprises a first coupler, a second coupler and a third coupler;
the input port of the first coupler is connected with the other output port of the circulator I through a single-mode fiber F;
The output port of the first coupler is connected with the input port of the second coupler through a single mode fiber I;
the other input port of the second coupler is connected with the first output port of the first coupler through a single-mode fiber G;
the second output port of the first coupler is connected with the input port of the third coupler through a single mode fiber J;
the other input port of the third coupler is connected with the output port of the second coupler through a single mode fiber H.
Preferably, the output port of the third coupler is connected with the input port of the second circulator through a single-mode fiber K, wherein the output port of the second circulator is connected with the input port of the sonar array plate through a single-mode fiber M, and the other output port of the second circulator is connected with the input port of the avalanche photodiode through a single-mode fiber L.
Preferably, the sonar array plate is integrally packaged after being composed of a bottom plate and a plurality of film sheet type optical fiber vibration sensors fixedly connected to one side surface of the bottom plate, and the film sheet type optical fiber vibration sensors are connected through optical fibers.
Preferably, the output port of the avalanche photodiode is connected with the input port of the photoelectric detector through a single-mode fiber N, the output port of the photoelectric detector is connected with the console through a single-mode fiber O, and the console is in communication connection with the signal transmitting unit.
The beneficial effects of the invention are as follows:
1. When the device is used, the porous sonar ball body of the porous light carbon fiber material is directly put into the sea to perform marine seismic monitoring, monitoring data is transmitted to the central processing unit to be received through the information transmitting unit, the information collecting unit utilizing the optical fiber Michelson coherent structure principle is arranged at the bottom of the sea, an acoustic signal caused by marine seismic can enable the Michelson interference system to generate a phase difference, and the marine seismic signal is easy to receive by the sensing optical fiber due to extremely high sensitivity of the optical fiber interferometer, so that marine seismic detection, target detection, submarine physical parameter data collection, submarine ocean current flow velocity and direction data collection can be realized, the device still reliably works in severe environments, an adopted optical path has the characteristic of dynamic self-adaption of central wavelength, and can effectively inhibit the phenomenon of mode jump, so that a laser light source is stabilized, the optical signal to noise ratio is improved, and the sonar array plate matched with the optical path is used for improving the sensitivity of marine seismic monitoring, and the device is stable in work, convenient to arrange and use, relatively easy to popularize with respect to the traffic bottom.
2. The invention adopts a narrow linewidth laser as a pumping source, an emitted pumping light source enters a erbium-doped optical fiber amplifier from a single mode fiber A through an acousto-optic modulator, then is connected with an input port of a circulator I through a wavelength division multiplexer, an output port of the circulator I is connected with a Michelson reference grating, light reflected by the reference grating is injected into a multi-ring resonant cavity formed by a first coupler, a second coupler and a third coupler, and the number of modes in the resonant cavity is suppressed, so that the selection of a single longitudinal mode in the resonant cavity is realized.
3. According to the invention, the light reflected by the single-mode optical fiber I and the single-mode optical fiber J and the incident light form a standing wave interference effect, the light intensity of antinodes and nodes at the standing wave is periodically distributed to cause the periodic change of the refractive index, and finally, a dynamic grating is formed in the third coupler, and has extremely narrow reflection bandwidth, and meanwhile, the characteristic of self-adaption of the center wavelength is realized, so that the mode-jump phenomenon can be effectively restrained.
4. The output port of the circulator II is connected with the sonar array plate through the single-mode fiber M, when the optical fiber vibration sensor in the sonar array plate receives vibration, the optical fiber is deformed, the optical refractive index and the like in the optical fiber are changed, the optical fiber is transmitted to the rear end and is compared and demodulated with the front reference optical signal through the Michelson interference system to obtain vibration information, so that the sensitivity of marine seismic monitoring is improved, the output port of the circulator II is connected with the avalanche photodiode and the photoelectric detector to perform photoelectric modulation conversion and control of signals, the optical signals are converted into electric signals, the electric signals are processed by the control console in the next step, and the use is convenient.
Drawings
FIG. 1 is a schematic diagram of an acoustic sensing fiber optic path of a marine seismic acoustic monitoring system based on fiber optic coherent sensing technology in accordance with the present invention;
Fig. 2 is a schematic diagram of a sonar array plate structure according to the present invention.
In the figure, a narrow linewidth laser, a 2 single mode fiber A, a 3 acousto-optic modulator, a 4 single mode fiber B, a 5 erbium-doped fiber amplifier, a 6 single mode fiber C, a 7-wavelength division multiplexer, an 8 single mode fiber D, a 9 single mode fiber, a 10 single mode fiber E, an 11 Michelson reference grating, a 12 single mode fiber F, a 13 first coupler, a 14 single mode fiber G, a 15 second coupler, a 16 single mode fiber H, a 17 third coupler, a 18 single mode fiber I, a 19 single mode fiber J, a 20 single mode fiber K, a 21 single mode fiber B, a 22 single mode fiber L, a 23 single mode fiber M, a 24 sonar array plate, a 25 avalanche photodiode, a 26 single mode fiber N, a 27 photoelectric detector, a 28 single mode fiber O and a 29 control console are shown.
Detailed Description
The technical scheme of the patent is further described in detail below with reference to the specific embodiments.
Embodiments of the present patent are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present patent and are not to be construed as limiting the present patent.
Example 1:
The marine seismic acoustic monitoring system based on the optical fiber coherent sensing technology comprises a central processing unit, an information acquisition unit and a signal transmitting unit, wherein the information acquisition unit is used for acquiring acoustic information and processing and analyzing, and the signal transmitting unit is used for realizing acoustic signal transmission, and the signal transmitting unit is respectively in communication connection with the information acquisition unit and the central processing unit;
the information acquisition unit is a porous sonar ball body, a buoy is arranged above the porous sonar ball body, and preferably, the buoy can be one of a light high-strength buoyancy material, a natural buoyancy material and the like and is used for realizing the offshore buoyancy support of the porous sonar ball body. When the device is used, the porous sonar ball body is directly put into the sea for marine seismic monitoring, and monitoring data is transmitted to the central processing unit for receiving through the information transmitting unit, so that relevant personnel know, and the device is convenient to use.
Preferably, the signal transmitting unit is arranged on the top surface of the buoy;
Further preferably, the porous sonar ball body is made of a lightweight carbon fiber material with a porous structure, and seawater can be directly poured into the porous sonar ball body without involving sealing problems.
Further, an acoustic sensing optical fiber capable of directly receiving marine seismic or acoustic signals is arranged in the porous sonar ball body, and comprises a pumping source, an acoustic optical modulator 3, a erbium-doped optical fiber amplifier 5, a wavelength division multiplexer 7, a circulator I9, a Michelson reference grating 11, a multi-ring resonance component, a circulator II 21, a sonar array plate 24, an avalanche photodiode 25 and a photoelectric detector 27;
preferably, the pump source is a narrow linewidth laser 1;
further preferably, one end of the pump source is connected with the input port of the acousto-optic modulator 3 through a single mode fiber A2;
It is further preferred that the output port of the acousto-optic modulator 3 and the input port of the erbium-doped fiber amplifier 5 are connected through a single mode fiber B4, and the acousto-optic modulator 3 (AOM) performs optical wave modulation by using an acousto-optic effect.
It is further preferred that the output port of the Erbium doped fiber amplifier 5 and the input port of the wavelength division multiplexer 7 are connected by a single mode fiber C6, and that the Erbium doped fiber amplifier 5 (Erbium-Doped Fiber Amplifier, EDFA) uses an Erbium doped fiber for amplifying the optical signal.
Further preferably, the output port of the wavelength division multiplexer 7 is connected with the input port of the circulator one 9 through a single-mode fiber D8;
further preferably, the output port of the circulator one 9 and the input port of the michelson reference grating 11 are connected through a single mode fiber E10;
It is further preferred that the output port of the michelson reference grating 11 and the input port of the circulator two 21 are connected through a multi-ring resonant assembly, the narrow linewidth laser 1 is adopted as a pumping source, the emitted pumping light source enters the erbium-doped fiber amplifier 5 from the single-mode fiber A2 through the acousto-optic modulator 3, and then is connected with the input port of the circulator one 9 through the wavelength division multiplexer 7, the output port of the circulator one 9 is connected with the michelson reference grating 11, the light reflected by the reference grating is injected into the multi-ring resonant cavity formed by the first coupler 13, the second coupler 15 and the third coupler 17, and the number of the modes in the resonant cavity is suppressed, so that the selection of the single longitudinal mode in the resonant cavity is realized.
Further preferably, the multiple ring resonator assembly comprises a first coupler 13, a second coupler 15 and a third coupler 17;
wherein the input port of the first coupler 13 is connected with the other output port of the circulator one 9 through a single-mode fiber F12;
further preferably, the output port of the first coupler 13 is connected with the input port of the second coupler 15 through a single mode fiber I18;
the other input port of the second coupler 15 is connected with the first output port of the first coupler 13 through a single-mode fiber G14;
The second output port of the first coupler 13 is further preferably connected with the input port of the third coupler 17 through a single mode fiber J19, the light reflected by the single mode fiber I18 and the single mode fiber J19 forms a standing wave interference effect with the incident light, the light intensity of antinodes and nodes at the standing wave is periodically distributed to cause the periodic variation of refractive index, and finally a dynamic grating is formed in the third coupler 17, and has extremely narrow reflection bandwidth and the characteristic of self-adaption of the center wavelength, so that the mode jump phenomenon can be effectively restrained.
The other input port of the third coupler 17 is connected to the output port of the second coupler 15 through a single mode fiber H16.
Still further preferably, the output port of the third coupler 17 is connected to the input port of the second circulator 21 through a single mode fiber K20, where the output port of the second circulator 21 is connected to the input port of the sonar array plate 24 through a single mode fiber M23, the other output port of the second circulator 21 is connected to the input port of the avalanche photodiode 25 through a single mode fiber L22, and the avalanche photodiode 25 (AVALANCHE PHOTODIODE, APD) is used as a photodetector capable of converting an optical signal into an electrical signal.
Further preferably, the output port of the avalanche photodiode 25 is connected to the input port of the photodetector 27 through a single-mode optical fiber N26;
Still further preferably, the output port of the photodetector 27 is connected to a console 29 through a single mode fiber O28, and the console 29 is connected to the signal transmitting unit in a communication manner. The output port of the circulator II 21 is connected with the sonar array plate 24 through a single-mode fiber M23, when an optical fiber vibration sensor in the sonar array plate 24 receives vibration and then deforms an optical fiber, the optical refractive index and the like in the optical fiber change, the optical fiber vibration sensor propagates to the rear end and is compared and demodulated with a front reference optical signal through a Michelson interference system to obtain vibration information, so that the sensitivity of marine seismic monitoring is improved, the output port of the circulator II 21 is connected with an avalanche photodiode 25 and a photoelectric detector 27 to perform photoelectric modulation conversion and control of signals, the optical signals are converted into electric signals, and the electric signals are processed in the next step by a console 29, and the use is convenient.
When the device is used, the porous sonar ball body is directly put into the sea to perform marine seismic monitoring, monitoring data are transmitted to the central processing unit to be received through the information transmitting unit, the information collecting unit utilizing the optical fiber Michelson coherent structure principle is arranged at the bottom of the sea, the Michelson interference system can generate phase difference due to acoustic signals caused by marine seismic, and the marine seismic signals are easily received by the sensing optical fibers due to extremely high sensitivity of the optical fiber interferometer, so that marine seismic detection, target detection, submarine physical parameter data collection and submarine ocean current flow speed and direction data collection can be realized.
The invention adopts a narrow linewidth laser 1 as a pumping source, an emitted pumping light source enters a erbium-doped optical fiber amplifier 5 from a single mode fiber A2 through an acousto-optic modulator 3, then is connected with an input port of a circulator I9 through a wavelength division multiplexer 7, an output port of the circulator I9 is connected with a Michelson reference grating 11, light reflected by the reference grating is injected into a multi-ring resonant cavity formed by a first coupler 13, a second coupler 15 and a third coupler 17, and the number of modes in the resonant cavity is suppressed, so that the selection of a single longitudinal mode in the resonant cavity is realized. The light reflected by the single-mode optical fiber I18 and the single-mode optical fiber J19 and the incident light form a standing wave interference effect, the light intensity of antinodes and nodes at the standing wave is periodically distributed to cause the periodic change of the refractive index, and finally, a dynamic grating is formed in the third coupler 17, has extremely narrow reflection bandwidth and self-adaptive characteristic of the center wavelength, and can effectively inhibit the mode-jump phenomenon. The output port of the circulator II 21 is connected with the sonar array plate 24 through a single-mode fiber M23, when an optical fiber vibration sensor in the sonar array plate 24 receives vibration, the optical fiber is deformed, the optical refractive index and the like in the optical fiber are changed, and the optical fiber is transmitted to the rear end to be compared and demodulated with a front reference light signal through a Michelson interference system to obtain vibration information, so that the sensitivity of monitoring marine earthquakes is improved. And the output port of the second circulator 21 is connected with the avalanche photodiode 25 and the photodetector 27 for photoelectric modulation conversion and control of signals, and the optical signals are converted into electric signals and transmitted to a signal transmitting unit by the console 29 for further processing.
Example 2:
in the marine seismic acoustic monitoring system based on the optical fiber coherent sensing technology, as shown in fig. 2, the following supplements are made on the basis of the embodiment 1, wherein the sonar array plate 24 is integrally packaged after being composed of a bottom plate and a plurality of thin film type optical fiber vibration sensors fixedly connected to one side surface of the bottom plate, preferably, the number of the thin film type optical fiber vibration sensors in the embodiment is 9, the plurality of thin film type optical fiber vibration sensors are connected through optical fibers, and the vibration signals are detected and analyzed by utilizing the transmission characteristics of the optical fibers through the connection relationship formed by the optical fibers.
The invention provides a special Michelson optical path which still reliably works in severe environments, the adopted optical path has the characteristic of dynamic self-adaption of central wavelength, and the mode-jump phenomenon can be effectively restrained, so that a laser light source is stabilized, the optical signal to noise ratio is improved, and the sonar array plate 24 matched with the optical path is used for improving the sensitivity of marine seismic monitoring.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. The marine seismic acoustic monitoring system based on the optical fiber coherent sensing technology comprises a central processing unit, an information acquisition unit for acquiring acoustic information and processing and analyzing and a signal transmitting unit for realizing acoustic signal transmission, and is characterized in that the signal transmitting unit is respectively in communication connection with the information acquisition unit and the central processing unit, the information acquisition unit is a porous sonar ball body, a buoy is arranged above the porous sonar ball body, and the signal transmitting unit is arranged on the top surface of the buoy;
and an acoustic sensing optical fiber is arranged in the porous sonar ball body.
2. The marine seismic acoustic monitoring system based on the optical fiber coherent sensing technology according to claim 1, wherein the porous sonar ball body is made of a lightweight carbon fiber material with a porous structure;
the buoy is one of a light high-strength buoyancy material and a natural buoyancy material.
3. The marine seismic acoustic monitoring system based on optical fiber coherent sensing technology according to claim 1, wherein the acoustic sensing optical fiber comprises a pump source, an acousto-optic modulator (3), a erbium doped fiber amplifier (5), a wavelength division multiplexer (7), a circulator one (9), a michelson reference grating (11), a multi-ring resonator assembly, a circulator two (21), a sonar array plate (24), an avalanche photodiode (25) and a photodetector (27);
The pump source is a narrow linewidth laser (1).
4. A marine seismic acoustic monitoring system based on optical fiber coherence sensing technology according to claim 3, characterized in that one end of the pump source is connected to the input port of the acousto-optic modulator (3) through a single mode optical fiber a (2), and the output port of the acousto-optic modulator (3) is connected to the input port of the erbium-doped optical fiber amplifier (5) through a single mode optical fiber B (4).
5. The marine seismic acoustic monitoring system based on the optical fiber coherence sensing technology according to claim 4, wherein the output port of the erbium-doped optical fiber amplifier (5) is connected with the input port of the wavelength division multiplexer (7) through a single-mode optical fiber C (6), and the output port of the wavelength division multiplexer (7) is connected with the input port of the circulator I (9) through a single-mode optical fiber D (8).
6. The marine seismic acoustic monitoring system based on the optical fiber coherence sensing technology according to claim 5, wherein the output port of the circulator one (9) and the input port of the michelson reference grating (11) are connected through a single-mode optical fiber E (10), and the output port of the michelson reference grating (11) and the input port of the circulator two (21) are connected through a multi-ring resonance assembly.
7. A marine seismic acoustic monitoring system based on optical fiber coherence sensing technology as claimed in claim 6, characterized in that the multi-ring resonator assembly comprises a first coupler (13), a second coupler (15) and a third coupler (17);
The input port of the first coupler (13) is connected with the other output port of the first circulator (9) through a single-mode fiber F (12);
The output port of the first coupler (13) is connected with the input port of the second coupler (15) through a single-mode optical fiber I (18);
The other input port of the second coupler (15) is connected with the first output port of the first coupler (13) through a single-mode fiber G (14);
the second output port of the first coupler (13) is connected with the input port of the third coupler (17) through a single mode fiber J (19);
The other input port of the third coupler (17) is connected with the output port of the second coupler (15) through a single-mode fiber H (16).
8. The marine seismic acoustic monitoring system based on the optical fiber coherent sensing technology according to claim 7, wherein the output port of the third coupler (17) is connected with the input port of the second circulator (21) through a single-mode optical fiber K (20), wherein the output port of the second circulator (21) is connected with the input port of the sonar array plate (24) through a single-mode optical fiber M (23), and the other output port of the second circulator (21) is connected with the input port of the avalanche photodiode (25) through a single-mode optical fiber L (22).
9. The marine seismic acoustic monitoring system based on the optical fiber coherence sensing technology according to claim 8, wherein the sonar array plate (24) is integrally packaged after being composed of a base plate and a plurality of thin film type optical fiber vibration sensors fixedly connected to one side surface of the base plate, and the plurality of thin film type optical fiber vibration sensors are connected through optical fibers.
10. The marine seismic acoustic monitoring system based on the optical fiber coherence sensing technology according to claim 9, wherein the output port of the avalanche photodiode (25) is connected with the input port of the photodetector (27) through a single-mode optical fiber N (26), the output port of the photodetector (27) is connected with the console (29) through a single-mode optical fiber O (28), and the console (29) is in communication connection with the signal transmitting unit.
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| CN202411405406.8A CN119270334A (en) | 2024-10-10 | 2024-10-10 | A marine seismic acoustic monitoring system based on optical fiber coherent sensing technology |
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| CN202411405406.8A CN119270334A (en) | 2024-10-10 | 2024-10-10 | A marine seismic acoustic monitoring system based on optical fiber coherent sensing technology |
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