CN114061732A - One-dimensional optical fiber vector hydrophone structure - Google Patents
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Abstract
The utility model provides a one-dimensional optical fiber vector hydrophone structure, which comprises a narrow-linewidth light source, a signal sounder, a light splitting coupler, a one-dimensional optical fiber vector hydrophone structure probe and a collecting and demodulating component, wherein the narrow-linewidth light source is connected with the signal sounder; the optical output end of the narrow-linewidth light source is connected with the input end of the optical splitting coupler, and the electrical input port of the narrow-linewidth light source is connected with the output port of the signal sounder; the output end of the optical splitting coupler is connected with the input end of the one-dimensional optical fiber vector hydrophone structure probe, and the output end of the optical splitting coupler is connected with the acquisition and demodulation component; the output end of the one-dimensional optical fiber vector hydrophone structure probe is connected with the acquisition and demodulation component; the acquisition and demodulation assembly is used for acquiring and detecting signals. The utility model has simple structure, convenient production, low cost and complete functions.
Description
Technical Field
The utility model relates to the technical field of optical fiber sensing for ocean observation, in particular to a one-dimensional optical fiber vector hydrophone structure.
Background
The optical fiber standard hydrophone is an underwater acoustic signal sensor based on optical fiber and photoelectronic technology. An intensity modulated fiber-optic hydrophone is defined as: the optical fiber sensor detects the external physics and the variation thereof by using the light intensity variation in the optical fiber caused by the external factors. The measured physical quantity acts on the optical fiber (contact or non-contact), so that the intensity of the optical signal transmitted in the optical fiber is changed, and the measurement of the measured physical quantity can be realized by detecting the variation of the intensity of the optical signal, and the sensor is a scalar underwater acoustic signal sensor.
The optical fiber vector hydrophone is a novel underwater sound vector signal sensor using optical fibers as a sensing medium, and is an acceleration vector sensor usually formed by a scalar sensor, so that the acceleration signal of an underwater sound field can be obtained, and further, other vector information of the underwater sound field can be obtained, including vector information such as the propagation direction of energy, the propagation direction of the acceleration signal, the propagation direction of an acoustic signal and the like.
The PGC method has the basic idea that a phase carrier is generated in the output phase of the interferometer, so that the output signal can be decomposed into two orthogonal components, and the two orthogonal components are respectively processed to obtain a linear expression of the signal. One is a DCM-based PGC demodulation technique, and the other is based on the principle of the arctangent PGC algorithm.
The existing interference type optical fiber vector hydrophone is generally formed by matching and combining a spherical homovibration type three-dimensional optical fiber vector hydrophone and a standard optical fiber hydrophone. The defects of large occupied volume, difficult assembly, complex system, high synchronous acquisition requirement and the like exist, and the miniaturization and large-scale production of the optical fiber vector hydrophone and the engineering application with low cost are limited.
The patent document with publication number CN207570662U discloses a three-dimensional differential pressure type optical fiber vector hydrophone, which comprises a base, pillars, 6 optical fiber hydrophones, a hydrophone mounting plate, hydrophone fixing members, hydrophone Z-axis fixing members and a cover plate, wherein the base comprises a base, a reserved optical fiber access port and a base cover plate, the pillars are composed of 3 types of pillars, the pillar 1 penetrates through the hydrophone mounting plate, the pillar 2 and the pillar 3 support the hydrophone mounting plate together, and all the pillars are finally connected with the base and the cover plate to form a pillar frame; the optical fiber hydrophone is fixedly installed with the hydrophone fixing piece and the hydrophone installing plate. The three-dimensional differential pressure type optical fiber vector hydrophone has the advantages of reasonable structure, simple manufacturing process and high reliability. However, the patent document still has the defects of large occupied volume, difficult assembly, complex system, high synchronous acquisition requirement and the like.
Disclosure of Invention
In view of the shortcomings in the prior art, it is an object of the present invention to provide a one-dimensional fiber vector hydrophone structure.
The one-dimensional optical fiber vector hydrophone structure provided by the utility model comprises a narrow-linewidth light source, a signal sounder, a light splitting coupler, a one-dimensional optical fiber vector hydrophone structure probe and a collecting and demodulating component;
the optical output end of the narrow line width light source is connected with the input end of the optical splitting coupler, and the electrical input port of the narrow line width light source is connected with the output port of the signal sounder;
the output end of the light splitting coupler is connected with the input end of the one-dimensional optical fiber vector hydrophone structure probe, and the output end of the light splitting coupler is connected with the acquisition and demodulation component;
the output end of the one-dimensional optical fiber vector hydrophone structure probe is connected with the acquisition and demodulation assembly;
the acquisition and demodulation assembly is used for acquiring and detecting signals.
Preferably, the optical splitter is an optical splitter.
Preferably, the output end of the optical splitter is connected with the acquisition and demodulation assembly through a multimode sensing optical fiber.
Preferably, the one-dimensional optical fiber vector hydrophone structure probe comprises an optical fiber scale hydrophone and a one-dimensional co-vibrating optical fiber vector hydrophone structure;
the one-dimensional co-vibrating optical fiber vector hydrophone structure is arranged inside the optical fiber scalar hydrophone, and the optical fiber scalar hydrophone is connected with the light splitting coupler and the acquisition and demodulation assembly.
Preferably, the optical fiber scalar hydrophone comprises an outer cylinder and a multimode sensing optical fiber;
the multimode sensing optical fiber is wound on the outer barrel, and two ends of the multimode sensing optical fiber are respectively connected with the light splitting coupler and the acquisition and demodulation assembly;
the one-dimensional co-vibration optical fiber vector hydrophone structure is positioned in the outer cylinder.
Preferably, a thread valley is arranged on the outer cylinder, and the multimode sensing optical fiber is wound in the thread valley.
Preferably, a longitudinal groove is arranged in the thread valley and used for limiting and fixing the multimode sensing optical fiber.
Preferably, a thread is arranged in the thread valley, and the thread is used for increasing the friction force between the multimode sensing optical fiber and the inner side wall of the thread valley.
Preferably, the one-dimensional homodyne optical fiber vector hydrophone structure comprises a first elastic cylinder, a second elastic cylinder and a mass block;
the first elastic tube and the second elastic tube are respectively connected and arranged on two sides of the mass block, one end, far away from the mass block, of the first elastic tube is connected and arranged on the inner side wall of the optical fiber standard hydrophone, and one end, far away from the mass block, of the second elastic tube is connected and arranged on the inner side wall of the optical fiber standard hydrophone.
Preferably, the size of the light splitting coupler is 20mmX2 mm.
Compared with the prior art, the utility model has the following beneficial effects:
1. the practical lower limit of the length of the hydrophone can be as short as about 20mm, and a miniaturized and high-sensitivity one-dimensional co-vibrating optical fiber vector hydrophone can be designed according to the requirements of engineering environments, so that a basis is provided for miniaturization development;
2. the core optical component is a multimode optical fiber and an optical fiber interferometer, the structure is simple, the number of core devices is few, the system is simple and stable, the assembly and the processing are convenient, and the optical fiber interferometer is very suitable for the engineering mass production and preparation task;
3. the utility model can be miniaturized, and broadens the working frequency band of the one-dimensional vector hydrophone;
4. the utility model has simple technology and is easy to popularize and apply.
Drawings
Other features, objects and advantages of the utility model will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of a system optical path of a one-dimensional fiber vector hydrophone structure according to the present invention;
FIG. 2 is a schematic structural diagram of a one-dimensional fiber vector hydrophone structure probe of the present invention;
FIG. 3 is a schematic diagram of the connection of the internal optical paths of a one-dimensional fiber vector hydrophone structure according to the present invention;
FIG. 4 is a schematic diagram of a system demodulation algorithm for a one-dimensional fiber vector hydrophone structure according to the present invention;
FIG. 5 is a schematic diagram showing the relationship between the detection signal frequency and the acceleration sensitivity of a one-dimensional fiber vector hydrophone structure according to the present invention;
FIG. 6 is a schematic diagram of the schematic structure of a Michelson fiber interferometer.
The figures show that:
narrow linewidth light source 1 multimode sensing optical fiber 4012
First elastic tube 4021 of optical splitter 3
One-dimensional optical fiber vector hydrophone structure probe 4 and second elastic cylinder 4022
Fiber-optical standard hydrophone 401 mass block 4023
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the utility model, but are not intended to limit the utility model in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the utility model. All falling within the scope of the present invention.
Example 1:
as shown in fig. 1 to 5, the one-dimensional optical fiber vector hydrophone structure provided in this embodiment includes a narrow-line-width light source 1, a signal generator 2, a spectroscopic coupler 3, a one-dimensional optical fiber vector hydrophone structure probe 4, and a collecting and demodulating assembly 5, an optical output end of the narrow-line-width light source 1 is connected to an input end of the spectroscopic coupler 3, an electrical input port of the narrow-line-width light source 1 is connected to an output port of the signal generator 2, an output end of the spectroscopic coupler 3 is connected to an input end of the one-dimensional optical fiber vector hydrophone structure probe 4, an output end of the spectroscopic coupler 3 is connected to the collecting and demodulating assembly 5, an output end of the one-dimensional optical fiber vector hydrophone structure probe 4 is connected to the collecting and demodulating assembly 5, and the collecting and demodulating assembly 5 is used for collecting and detecting signals. The optical splitter 3 is a 50:50 optical splitter. The output end of the optical splitter 3 is connected with the acquisition and demodulation component 5 through a multimode sensing optical fiber 4012. The size of the optical splitter 3 is 20mmX2 mm.
The one-dimensional optical fiber vector hydrophone structure probe 4 comprises an optical fiber scalar hydrophone 401 and a one-dimensional co-vibrating optical fiber vector hydrophone structure 402, the one-dimensional co-vibrating optical fiber vector hydrophone structure 402 is arranged inside the optical fiber scalar hydrophone 401, and the optical fiber scalar hydrophone 401 is connected with the light splitting coupler 3 and the collecting and demodulating component 5. Optical fiber scalar hydrophone 401 includes urceolus 4011 and multimode sensing optic fibre 4012, multimode sensing optic fibre 4012 winds on urceolus 4011, optical splitter 3 and collection and demodulation subassembly 5 are connected respectively to multimode sensing optic fibre 4012's both ends, one-dimensional syntonic formula optic fibre vector hydrophone structure 402 is located urceolus 4011, be provided with the thread valley on urceolus 4011, multimode sensing optic fibre 4012 winds in the thread valley, be provided with longitudinal groove in the thread valley, longitudinal groove is used for spacing fixed multimode sensing optic fibre 4012, be provided with the screw thread in the thread valley, the screw thread is used for increasing multimode sensing optic fibre 4012 and the frictional force of thread valley inside wall. The one-dimensional co-vibrating fiber vector hydrophone structure 402 comprises a first elastic cylinder 4021, a second elastic cylinder 4022 and a mass block 4023, the first elastic cylinder 4021 and the second elastic cylinder 4022 are respectively connected and arranged on two sides of the mass block 4023, one end, far away from the mass block 4023, of the first elastic cylinder 4021 is connected and arranged on the inner side wall of the fiber standard hydrophone 401, and one end, far away from the mass block 4023, of the second elastic cylinder 4022 is connected and arranged on the inner side wall of the fiber standard hydrophone 401.
Example 2:
those skilled in the art will understand this embodiment as a more specific description of embodiment 1.
In order to solve the engineering application, overcome the difficulty of complex preparation of the existing optical fiber vector hydrophone, fully simplify the structure of the optical fiber vector hydrophone, facilitate the processing and preparation, simplify the system and keep the characteristics of miniaturization, high sensitivity and the like,
as shown in fig. 1-5, the embodiment provides an optical fiber vector hydrophone structure with a one-dimensional co-vibrating optical fiber vector hydrophone inside and an intensity type optical fiber hydrophone outside, such a structure can be according to engineering environment requirements, the design is miniaturized, the one-dimensional co-vibrating optical fiber vector hydrophone with high sensitivity, the complexity of winding work of an optical fiber interferometer sensing arm is greatly reduced by the one-dimensional co-vibrating optical fiber vector hydrophone, the preparation success rate and stability are greatly improved, the preparation time is reduced, and the optical fiber vector hydrophone structure is very suitable for engineering mass production preparation tasks. The outside is the intensity optical fiber hydrophone, has widened the operating band of intensity optical fiber hydrophone. The structure also simplifies the complexity of the system, reduces the number of system components and is beneficial to the stability of the system.
The technical scheme adopted by the embodiment is as follows:
the new structure system of the one-dimensional optical vector hydrophone comprises a narrow-linewidth light source 1, a signal sounder 2, a 50:50 optical splitter, a new structure probe 4 of the one-dimensional optical vector hydrophone and a collecting and demodulating system.
An optical output end of a narrow-line-width light source 1 with an optical isolator arranged inside is connected with a 50:50 optical splitter, an electrical input port of the narrow-line-width light source 1 is connected with an output port of a signal sounder 2, an input end A of the 50:50 optical splitter is connected with an output end of the narrow-line-width light source 1, and an output end B of the optical splitter 3 is connected with an input end of a one-dimensional optical fiber vector hydrophone structure probe 4 through a flange plate. The output end D of the light splitting coupler 3 is connected with the multimode sensing optical fiber, the multimode sensing optical fiber is wound along the grain groove on the surface of the outer barrel, and the output end of the multimode sensing optical fiber is connected with the photoelectric detector PIN in the acquisition and demodulation system 5. The acquisition and demodulation system 5 is connected with the output end B of the optical splitter coupler 3 to be used as a signal acquisition and detection instrument.
The outside of the probe 4 of the one-dimensional fiber vector hydrophone structure is as follows: an improved micro-bending hydrophone structure based on a strength type optical fiber standard hydrophone 401 wound by multimode sensing optical fibers is shown in fig. 2, wherein an outer cylinder 4011 in the embodiment is an aluminum pipe provided with a longitudinal groove and a thread groove on the surface. The multimode sensing optical fiber 8 with the rubber sleeve is wound in a thread valley of an aluminum pipe which is provided with a longitudinal groove and a thread, the fiber part wound in the longitudinal groove receives external sound pressure transmitted by the rubber sleeve (sensitization) to generate deformation, other parts of the optical fiber are fixed by the thread groove of the aluminum pipe without deformation, and the rubber sleeve of the optical fiber does not bear pressure, so that the optical fiber at the groove of the aluminum pipe generates micro-bending deformation under the action of underwater sound pressure, the power of a cladding scattering mode is increased, and the power of a conduction mode in a fiber core is reduced.
The inside of the one-dimensional optical fiber vector hydrophone structure probe 4 is as follows: the one-dimensional co-vibrating fiber vector hydrophone structure 402 comprises an elastomeric cylinder and a proof mass disposed within the outer cylinder. The lower limit of the size of the probe 4 of the one-dimensional fiber vector hydrophone structure is mainly caused by the fact that the size of the probe is directly limited by the size of a coupler of the fiber interferometer which is an assembly component. The size of the fiber interferometer coupler adopted by the embodiment is 20mmX2mm, and the size is small.
The embodiment provides a new structure of a one-dimensional optical fiber vector hydrophone, wherein the outside of the hydrophone is an optical fiber scalar hydrophone, and the inside of the hydrophone is a one-dimensional optical fiber vector hydrophone combination. The actual lower limit of the length of the new structure can be as short as about 20mm, and a miniaturized and high-sensitivity one-dimensional co-vibrating optical fiber vector hydrophone can be designed according to the requirements of engineering environments, so that a basis is provided for miniaturization development. The new structure core optical component is a multimode fiber and a fiber interferometer, the structure is simple, the core devices are few, the system is simple and stable, the assembly and the processing are convenient, and the new structure core optical component is very suitable for the engineering mass production and preparation tasks. Moreover, the novel structure can be miniaturized, so that the working frequency band of the one-dimensional vector hydrophone is theoretically widened, and the broadband of the strength type optical fiber hydrophone is relatively large, so that the working frequency of the novel structure is widened on the whole. The technology of the new structure is simple, and the popularization and the application are easy.
Example 3:
those skilled in the art will understand this embodiment as a more specific description of embodiment 1.
As shown in fig. 1 to 5, the new structure system of the one-dimensional fiber vector hydrophone includes a narrow line width light source 1, a signal sound generator 2, a 50:50 optical splitter, a one-dimensional fiber vector hydrophone structure probe 4, and a collecting and demodulating system.
The working mode of the embodiment is as follows: the signal generator 2 generates a carrier signal to the PZT of the narrow linewidth light source 1, and the narrow linewidth light source 1 with the built-in optical isolator generates a laser signal with a carrier, such as a 20kHz carrier, continuous light with a wavelength of 1550 nm. The 50:50 optical splitter is a common ABCD four-path input/output port of 2X2, continuous light is split into 1:1 laser by the laser through an input port A of the optical splitter 3, one path of the laser is transmitted to the one-dimensional optical fiber vector hydrophone through a port C, after a water sound field signal is detected, the optical signal returns to an output port B of the optical splitter 3 through an optical fiber interferometer, enters a collecting and demodulating system, and various unknown quantities of the detected sound field are finally demodulated. The other path of the optical splitter 3 is transmitted to a multimode sensing optical fiber through an output port D, the multimode optical fiber is wound in a threaded valley of an aluminum pipe which is provided with a longitudinal groove and is provided with threads, and the tail part of the multimode optical fiber is connected to a photoelectric detector PIN in an acquisition and demodulation system, so that the change of the power of a conduction mode in an optical fiber core can be detected under the action of underwater sound pressure, and finally the pressure of an underwater sound signal is obtained.
Inside, the theory of operation of one-dimensional syntonic sensor is: two arms of the optical fiber Michelson interferometer are respectively wound on the outer side of an elastic body of a cylindrical shell of an air cavity, a mass block is bonded between the two symmetrical elastic bodies, and in an initial state, the gravity of the mass block, the elastic restoring force of the elastic body and the optical fiber pretension force interact to enable the elastic bodies to be in a balanced state. When the sensor head is subjected to the acceleration a in the direction, the mass generates tensile and compressive forces on the two elastic bodies respectively due to inertia, so that the shell expands and contracts in the radial direction, and one arm of the wound optical fiber is stretched and the other arm is shortened, and the push-pull output is obtained.
External, the theory of operation of intensity type optic fibre hydrophone: the hydrophone based on the optical fiber microbending effect is made of multimode optical fibers, and a strength type hydrophone structure is shown in figure 2, the multimode optical fibers are wound in aluminum pipe thread valleys which are provided with longitudinal grooves and threads, the longitudinal grooves are wound with optical fiber parts to receive external sound pressure transmitted by rubber jackets (sensitization) to generate deformation, other parts of the optical fibers are fixed by the thread grooves of the aluminum pipes without deformation, the rubber jackets of the optical fibers do not bear pressure, therefore, under the action of the underwater sound pressure, the optical fibers at the grooves of the aluminum pipes generate microbending deformation, the power of cladding scattering modes is increased, and the power of a conduction mode in a fiber core is reduced. By detecting the change of the optical power, the pressure value of the underwater acoustic signal can be obtained.
As shown in fig. 6, the basic operation principle of the demodulation algorithm is: the optical fiber sensor adopts a Michelson type structure for a 2x2 coupler, the basic principle is double-beam interference, and a schematic structural diagram of the Michelson optical fiber interferometer is shown in figure 6. After coherent light emitted by the laser passes through the optical isolator, the coherent light is split by the coupler, and the split coherent light enters two arms of the interferometer, namely a sensing arm and a reference arm. The optical signal is reflected by the mirrors at the ends of the sensing and reference arms and interferes at the output of the coupler. The phase term of the interfering light signal is the difference between the phases of the transmitted light in the two arms. In the structural design of the optical fiber hydrophone, the sensing arm is combined with the acoustic sensitive elastic material, so that the sensitivity of the transmission optical phase in the sensing arm to the underwater acoustic signals is realized, and the insensitivity of the transmission optical phase in the reference arm to the underwater acoustic signals is realized.
The basic idea of the demodulation algorithm is to generate a phase carrier in the output phase of the interferometer, so that the output signal can be decomposed into two orthogonal components, and the two components are processed respectively to obtain a linear expression of the signal.
The interference signal I output by the optical fiber hydrophone after being modulated by the carrier phase is as follows:
wherein, A is input light intensity, and a direct current term related to the input light intensity of the interferometer, the polarizer and the insertion loss of the coupler; amplitude B of interference signal kA, k<1(k is interference fringe coherence), which is related to the input light intensity of the fiber interferometer, the coupling ratio of the coupler, the extinction ratio of the interferometer, the loss of the reflection end face, and the like. C is modulation depth, which is usually realized by directly modulating light source frequency by adopting piezoelectric ceramic PZT; omegacIs the frequency of the phase carrier, Ccos ωct is generated by the phase modulation of the carrier,
represents the sum of phase difference generated by external environment, initial phase difference and phase difference caused by other factors,
is generated by the sound pressure signal acting on the sensing arm and is proportional to the sound pressure signal to be measured. There is an indeterminate initial phase in the interferometer, but this does not affect the extraction of amplitude and frequency information for the dynamic hydroacoustic signal.
Is provided with
Performing Bessel expansion on the above formula to obtain:
in the above formula, Jk(c) The Bessel function value when x is C is shown.
When k is 1, 2, 3 to infinity, (-1)kJ2k(c) Each value of (a) is added up to obtain a value.
Interference signal I multiplied by cos omegact and after low pass filtering gives:
-BJ1(C)sinΦ(t)
interference signal I multiplied by cos2 omegact and after low pass filtering gives:
-BJ2(C)cosΦ(t)
the schematic block diagram of the algorithm based on the arctan operation is shown in fig. 4, and the two formulas obtained after filtering are divided:
j can be obtained by determining the value of C1(C)/J2(C) Thus, the tangent value (tan phi (t)) of the signal to be demodulated is calculated, and the signal to be detected phi (t) can be obtained through the arctangent operation. The value range of [0,2 pi ] of the double-valued arc tangent can be formed by periodic expansion]Extending to a large extent. The operation of arctangent can be implemented by a look-up table.
The impact resistance analysis, because the new structure of the one-dimensional optical fiber vector hydrophone is internally provided with the same-vibration vector hydrophone structure, the same-vibration structure has good impact resistance, namely, the physical structure of a sphere can be well kept from being damaged under physical collision and physical impact in water. The combination of the forms naturally has impact resistance, so that the impact resistance of the system is greatly improved, and the sound pressure gradient can be measured. When detecting the underwater sound scalar quantity and vector information, the miniaturization design of the structure leads the whole working frequency band of the underwater sound detection to be widened.
The utility model has simple structure, convenient production, low cost and complete functions.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the utility model. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A one-dimensional optical fiber vector hydrophone structure is characterized by comprising a narrow-linewidth light source (1), a signal sounder (2), a light splitting coupler (3), a one-dimensional optical fiber vector hydrophone structure probe (4) and a collecting and demodulating component (5);
the optical output end of the narrow line width light source (1) is connected with the input end of the light splitting coupler (3), and the electrical input port of the narrow line width light source (1) is connected with the output port of the signal sounder (2);
the output end of the optical splitting coupler (3) is connected with the input end of the one-dimensional optical fiber vector hydrophone structure probe (4), and the output end of the optical splitting coupler (3) is connected with the acquisition and demodulation component (5);
the output end of the one-dimensional optical fiber vector hydrophone structure probe (4) is connected with the acquisition and demodulation component (5);
the acquisition and demodulation component (5) is used for acquiring and detecting signals.
2. The one-dimensional fiber-vector hydrophone structure of claim 1, wherein the optical splitter coupler (3) is a 50:50 optical splitter coupler.
3. The one-dimensional fiber-vector hydrophone structure of claim 1, wherein the output of the optical splitting coupler (3) is connected to the acquisition and demodulation assembly (5) via a multimode sensing fiber (4012).
4. The one-dimensional fiber-vector hydrophone structure of claim 1, wherein the one-dimensional fiber-vector hydrophone structure probe (4) comprises a fiber-optic scalar hydrophone (401) and a one-dimensional co-vibrating fiber-vector hydrophone structure (402);
the one-dimensional co-vibration type optical fiber vector hydrophone structure (402) is arranged inside the optical fiber scalar hydrophone (401), and the optical fiber scalar hydrophone (401) is connected with the light splitting coupler (3) and the acquisition and demodulation assembly (5).
5. The one-dimensional fiber vector hydrophone structure of claim 4, wherein the fiber scalar hydrophone (401) comprises an outer cylinder (4011) and a multimode sensing fiber (4012);
the multimode sensing optical fiber (4012) is wound on the outer cylinder (4011), and two ends of the multimode sensing optical fiber (4012) are respectively connected with the light splitting coupler (3) and the acquisition and demodulation component (5);
the one-dimensional co-vibrating fiber vector hydrophone structure (402) is located in the outer barrel (4011).
6. The one-dimensional fiber vector hydrophone structure of claim 5, wherein the outer barrel (4011) is provided with a thread valley, and the multimode sensing fiber (4012) is wound in the thread valley.
7. The one-dimensional fiber vector hydrophone structure of claim 6, wherein a longitudinal groove is arranged in the thread valley, and the longitudinal groove is used for limiting and fixing the multimode sensing fiber (4012).
8. The one-dimensional fiber vector hydrophone structure of claim 6, wherein threads are disposed in the thread valleys for increasing friction of the multimode sensing fiber (4012) against inner sidewalls of the thread valleys.
9. The one-dimensional fiber-vector hydrophone structure of claim 4, wherein the one-dimensional co-vibrating fiber-vector hydrophone structure (402) comprises a first elastomeric cylinder (4021), a second elastomeric cylinder (4022), and a mass (4023);
the first elastic tube (4021) and the second elastic tube (4022) are respectively connected and arranged on two sides of the mass block (4023), one end, far away from the mass block (4023), of the first elastic tube (4021) is connected and arranged on the inner side wall of the fiber scalar hydrophone (401), and one end, far away from the mass block (4023), of the second elastic tube (4022) is connected and arranged on the inner side wall of the fiber scalar hydrophone (401).
10. The one-dimensional fiber-vector hydrophone structure of claim 1, wherein the size of the optical splitter coupler (3) is 20mmX2 mm.
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