CN114777907A - Near-zero buoyancy hydrophone for underwater mobile platform and system thereof - Google Patents
Near-zero buoyancy hydrophone for underwater mobile platform and system thereof Download PDFInfo
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- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
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Abstract
The invention relates to a near-zero buoyancy hydrophone for an underwater mobile platform and a system thereof. The hydrophone structure comprises: the device comprises a sensing module, a signal conditioning module, a signal transmission module and an encapsulating structure; the sensing module includes: the hydrophone signal pickup unit is sealed by the potting structure, and an air cavity is formed inside the hydrophone signal pickup unit; the system comprises a sensing module, a signal conditioning module, an air cavity, an external interface module, a watertight connector and a power supply module; the sensing module is used for picking up acoustic signals; the signal conditioning module is used for amplifying, filtering and conditioning the signal; the peripheral interface module is used for transmitting signals to the watertight connector; the watertight connector is connected with the underwater mobile platform and the hydrophone and is used for transmitting voltage and signals; the power supply module is used for supplying voltage; the air cavity is used for constructing a sound field environment and adjusting the density of the hydrophones. The invention realizes that the hydrophone is arranged on the mobile platform and realizes the distortion-free real-time transmission of the acoustic signal.
Description
Technical Field
The invention relates to the field of deep sea marine instruments, in particular to a near-zero buoyancy hydrophone for an underwater mobile platform and a system thereof, and more particularly relates to an acoustic sensing device which can supply power to the underwater mobile platform and realize acoustic data and ocean background field information in the sea.
Background
The hydrophone is used for acquiring acoustic signals in the ocean and carrying out research works such as acoustic propagation, communication, detection and the like. With the continuous development of underwater vehicle technology, the ocean acoustic research work has already had the basic conditions of gradually moving from "shallow" to "deep" and from "static" to "dynamic", so the development meets the requirements of the acoustic sensor based on the use of an underwater mobile platform.
In recent years, the research work of temperature, ocean current, chlorophyll, turbidity and the like is internationally carried out by using an underwater mobile platform, which becomes a hot spot, and a plurality of domestic research institutions and scholars actively participate in the research work. The reason why the underwater mobile platform is used for carrying out acoustic research is that the underwater mobile platform has high self-noise and has high interference on the traditional hydrophone, and acoustic parameter measurement cannot be realized. Marine acoustic research work usually has high requirements on the environment, and usually requires that an acoustic sensing device (namely a hydrophone) is placed in an environment with a low noise background, so that the placement of the hydrophone cannot change the free field particle motion rule in a certain frequency range, the field distortion problem does not need to be considered, and the recorded result can be corrected only by using the response characteristic of the hydrophone. The lack of acoustic sensors suitable for underwater mobile platforms has become a main reason for limiting underwater mobile platforms to carry out acoustic observation.
In addition, the conventional underwater acoustic device is usually large or high in size, weight, power consumption and the like, and is not suitable for installation and use of the underwater observation platform at the present stage. Therefore, the development of hydrophone design based on the underwater mobile platform is a necessary choice for realizing the development of ocean acoustic characteristic research on the underwater mobile platform. The hydrophone is required to be wide in working frequency band, acoustic characteristics can be achieved by collecting signals of different frequency bands, the hydrophone can adapt to coupling characteristics of a mobile platform, and separation of self-noise and environmental noise is achieved.
At present, with the development and application of materials with small density, high strength and high sensitivity, the key technology supporting the invention is mature day by day. On the basis, the invention provides a near-zero buoyancy hydrophone for an underwater mobile platform, which is feasible in technical scheme, namely the hydrophone is arranged on the underwater mobile platform, picks up acoustic signals in the marine environment, and can finish filtering and amplification of the signals and distortion-free amplification transmission. At present, the existing hydrophones at home and abroad still belong to a single simple hydrophone based on underwater fixed installation or fixed platforms, the installation of a mobile platform cannot be realized, or effective sound signals are picked up, and meanwhile, relevant devices installed on the underwater mobile platform are not seen. According to the patent conditions of the applicant at home and abroad, no relevant design consistent with the scheme and similar to the scheme exists in the field of marine measuring instruments.
Disclosure of Invention
The invention aims to solve the problems that the existing underwater mobile platform is small in size, high in self-noise and incapable of being installed and used for collecting marine acoustic signals by using a traditional hydrophone. By adopting a method of mutually fusing the near-zero buoyancy design and the requirements of high sensitivity and large bandwidth acoustic signal perception of the underwater acoustic sensor, a novel hydrophone which is suitable for an underwater mobile platform, is small in size, low in power consumption and has the mutual adaptability with the coupling characteristic of the mobile platform is developed.
In order to achieve the purpose, the invention provides a near-zero buoyancy hydrophone for an underwater mobile platform and a system thereof.
The invention provides a near-zero buoyancy hydrophone for an underwater mobile platform, which comprises: the device comprises a sensing module, a signal conditioning module, a signal transmission module and an encapsulating structure (12), wherein the sensing module is connected with the signal conditioning module through a front board joint (14) and transmits generated electric signals to the signal conditioning module; the signal conditioning module is used for processing the received electric signals; the signal transmission module is used for transmitting the processed electric signal to the underwater mobile platform;
the sensing module includes: a hydrophone-based ring (2); the hydrophone basic ring (2) is used for picking up acoustic signals and converting the acoustic signals into electric signals;
two sides of the hydrophone basic-shaped ring (2) are respectively provided with a hydrophone element sealing cover (3), wherein one hydrophone element sealing cover (3) is provided with two groups of hydrophone element ring joints (13); one end of the hydrophone element ring joint (13) penetrates through the hydrophone element sealing cover (3) to be connected with the hydrophone base-shaped ring (2), and the other end of the hydrophone element ring joint is respectively connected with the two groups of front panel joints (14) through leads (15);
the outer layers of the hydrophone basic-ring (2) and the hydrophone elementary sealing cover (3) are wrapped with a layer of shielding net (1), and the shielding net (1) is used for shielding electromagnetic interference;
the encapsulating structure (12) is used for hermetically wrapping the space outside the shielding net (3) and the lead (15) and ensuring the integral water tightness, and meanwhile, an air cavity is formed between the hydrophone base-shaped ring (2) and the hydrophone element sealing cover (3), the hydrophone element ring joint (13), the front panel joint (14) and the lead (15); and the air cavity is used for constructing a sound field environment and adjusting the overall density of the hydrophone.
As an improvement of the above technical solution, the hydrophone-based ring (2) is in the shape of a circular ring, and includes a single sensing-based ring or a composite sensing-based ring formed by combining a plurality of single sensing-based rings in series and in parallel, and the material thereof is a novel piezoelectric sensing material, and includes: lead zirconate titanate piezoelectric ceramic pzt.
As another improvement of the above technical solution, the signal conditioning module includes: a front board (6); the front board (6) is provided with an amplifying circuit and a filtering circuit and is used for amplifying, filtering and conditioning the received electric signals.
As another improvement of the above technical solution, the front board (6) is mounted on the front board bracket (7) and is arranged inside the electronic cabin cavity (5); the electronic cabin cavity (5) is a watertight cabin body and is used for ensuring the watertightness; the front plate support (7) is used for supporting the front plate (6) to avoid the contact between the front plate (6) and the interior of the electronic cabin cavity (5).
As a further improvement of the above technical solution, an electronic cabin cavity sealing cover (4) is arranged on one side of the electronic cabin cavity (5); the front panel joint (14) penetrates through the electronic cabin cavity sealing cover (4) and is connected with the hydrophone basic ring (2) and the front panel (6) through a lead (15) and a hydrophone basic ring joint (13); an opening is formed in the other side of the electronic cabin cavity (5), and the front board (6) penetrates through the opening through a cable to be connected with the signal transmission module;
the watertight plug (9) is arranged outside one side, provided with an opening, of the electronic cabin cavity (5), and the watertight plug (9) is vulcanized with the outer layer of the cable at the opening and is used for ensuring the watertightness of the tail opening of the electronic cabin cavity (5);
and a fastening end cover (8) is screwed on the outer side of the watertight plug (9) and is used for preventing the watertight plug (9) from falling off.
As a further improvement of the technical scheme, a plurality of circles of circular ring-shaped vulcanizing grooves are formed at the top end of one side, close to the front panel joint (14), of the electronic cabin cavity (5) and used for preventing the encapsulating structure (12) from falling off.
As a further improvement of the above technical solution, the signal transmission module includes: a cable (10) and a cable joint (11); the cable joint (11) comprises a power line and a signal line; the power supply circuit is connected with a power supply circuit of the underwater mobile platform and used for converting voltage provided by the underwater mobile platform into voltage required by the hydrophone; the signal line is connected with a signal acquisition circuit of the underwater mobile platform and is used for transmitting the amplified, filtered and conditioned signal to the signal acquisition circuit of the underwater mobile platform.
As a further improvement of the technical scheme, the power supply circuit selects a low-power low-noise power supply, and the signal circuit selects a high-precision resistor and a high-precision capacitor to realize signal matching with a signal acquisition circuit of the underwater mobile platform.
As a further improvement of the technical scheme, the encapsulating structure (12) is made of a material with low water permeability and high sound permeability, and comprises the following components: polyurethane or rubber; the hydrophone element sealing cover (3) and the electronic cabin cavity sealing cover (4) are made of composite insulating materials, and the electronic cabin cavity (5) is made of the following materials: titanium alloy or polyoxymethylene plastic; the amplifier used by the amplifying circuit carried on the front board (5) is a low-power-consumption operational amplifier; the shielding net (1) and the fastening end cover (8) are made of metal and comprise: copper, titanium, aluminum and alloy materials.
The invention provides a near-zero buoyancy hydrophone system for an underwater mobile platform, which comprises a sensing module, a signal conditioning module, an external interface module, a watertight connector and a power supply module, wherein the sensing module is connected with the signal conditioning module; the peripheral interface module and the watertight connector form a signal transmission module;
the sensing module comprises a hydrophone base-membered ring and is used for picking up acoustic signals, converting the acoustic signals into electric signals and transmitting the electric signals to the signal conditioning module; the sensing module is packaged to form an air cavity, the air cavity is used for constructing a sound field environment, and meanwhile, the density of the hydrophone is adjusted;
the signal conditioning module is used for amplifying, filtering and conditioning the electric signals transmitted by the sensing module;
the peripheral interface module is respectively connected with the watertight connector and the signal conditioning module and is used for transmitting the conditioned electric signals to the watertight connector;
the watertight connector is respectively connected with the underwater mobile platform, the peripheral interface module and the power supply module, is used for transmitting the voltage provided by the underwater mobile platform to the power supply module, is also used for matching an electric signal transmitted by the peripheral interface module with an acquisition circuit of the underwater mobile platform, and transmits the electric signal after matching is finished;
and the power supply module is used for converting the voltage transmitted by the watertight connector into the voltage required by the hydrophone, and performing disconnection processing by the power supply module when the input voltage and current exceed the normal range.
The near-zero buoyancy hydrophone based on the underwater mobile platform is mainly realized in the marine environment, can realize autonomous operation work, and transmits acquired acoustic signals in real time without distortion.
Compared with the prior art, the invention has the advantages that:
1. the integration level is high: the underwater acoustic signal acquisition device has the capabilities of sensing, amplifying and filtering acoustic signals, can realize low power consumption and small volume, is integrated in an underwater mobile platform, and is favorable for acquiring acoustic signals and background field information in observation in a large scale range;
2. the signal quality is high: near-end processing of underwater acoustic signals is realized through near-zero buoyancy design, and the problems of signal attenuation, interference, voltage drop and the like of the traditional hydrophone are effectively solved;
3. high reliability: the hydrophone is designed together with the underwater mobile platform, hydrodynamic characteristics of the underwater mobile platform are not affected, structural strength of the hydrophone is improved, and the hydrophone is more suitable for marine environments. Meanwhile, the whole hydrophone is mutually independent with the mobile platform and other equipment carried by the mobile platform, so that fault isolation can be effectively realized, the underwater mobile platform and other parts are not damaged due to a certain fault, and the reliability of the system is greatly improved;
4. low noise: and a zero-buoyancy structure is adopted, so that the noise influence of the platform is reduced.
Drawings
FIG. 1 is a diagram of a basic installation bin layout for a near-zero buoyancy hydrophone based on an underwater mobile platform according to the present invention;
FIG. 2 is a block diagram of a near-zero buoyancy hydrophone of the present invention;
FIG. 3 is a block diagram of the connection relationship between the main functional modules of the near-zero buoyancy hydrophone of the present invention;
FIG. 4 is a schematic diagram of the structure of a hydrophone base-ring.
Reference numerals
1. Shielding net 2, hydrophone base-ring 3 and hydrophone element cover
4. Electron cabin cavity closing cap 5, electron cabin cavity 6, preceding board of putting
7. Front board support 8, fastening end cover 9 and watertight plug
10. Cable 11, cable joint 12, hydrophone embedment structure
13. Hydrophone element ring joint 14, front panel joint 15 and lead
16. Watertight joint 17, sound-permeable cabin section
Detailed Description
The technical scheme provided by the invention is further illustrated by combining the following embodiments.
The invention provides a near-zero buoyancy hydrophone for an underwater mobile platform and a system thereof, mainly relating to the following technical scheme: the device comprises a sensing module, a signal conditioning module, an air cavity, a peripheral interface module, a power supply module and the like. Therefore, when each part of the system is specifically designed and implemented, the function of the system function module must be subdivided on the basis of comprehensively considering the whole function of the system, and the work flow of the whole system must be planned.
The invention provides a near-zero buoyancy hydrophone system for an underwater mobile platform, which mainly comprises a sensing module, a signal conditioning module, an air cavity, an external interface module and a power supply module.
The sensing module is made of a novel piezoelectric sensing material and used for picking up acoustic signals in a certain frequency range in the ocean, and the acoustic sensor and the mobile platform synchronously operate;
the signal conditioning module is used for conditioning (including filtering and amplifying) the sound signals transmitted by the sensing module;
the air cavity is an air back lining constructed by structural design, a sound field environment is constructed based on certain signal frequency band processing requirements, and the density adjustment effect of the hydrophone is realized;
the peripheral interface module mainly comprises a watertight structure of the hydrophone, an original acoustic signal transmission and power supply interface and is matched with the rear-end acquisition circuit.
And the power supply module converts the voltage accessed by the underwater mobile platform into the voltage required by the hydrophone. And meanwhile, the input voltage and current are controlled, and if the voltage and the current exceed the normal range, the voltage and the current can be disconnected or correspondingly processed.
As shown in fig. 1, it is a layout structure diagram of a basic installation bin of a hydrophone cabin segment of a near-zero buoyancy hydrophone for an underwater mobile platform based on the invention. In the figure, the hydrophone is arranged in a sound-transmitting cabin section 17 in a rear air guide sleeve of an underwater mobile platform through a watertight joint 16, filled with water and works after being electrified.
Fig. 2 is a schematic diagram of a near-zero buoyancy hydrophone according to the present invention.
The hydrophone structure comprises: the device comprises a hydrophone basic ring 2, a hydrophone element sealing cover 3, a shielding net 1, an electronic cabin cavity 5, an electronic cabin cavity sealing cover 4, a fastening end cover 8, a front panel 6, a front panel support 7, a watertight plug 9, an encapsulating structure 12, a cable 10, a cable joint 11, a hydrophone element ring joint 13, a front panel joint 14 and a lead 15;
the hydrophone basic ring 2 is used for picking up acoustic signals and converting the acoustic signals into electric signals; two sides of the hydrophone basic ring are provided with a hydrophone element sealing cover 3 to form a hydrophone element; a layer of shielding net 1 is arranged outside the hydrophone element, and the shielding net 1 is used for shielding electromagnetic noise;
the hydrophone element ring joints 13 comprise two groups of conductive joints containing positive and negative electrodes and are connected with the hydrophone element ring 2 through the hydrophone element sealing covers 3;
the front board joint 14 comprises two groups of conductive joints containing positive and negative electrodes, and penetrates through the electronic cabin cavity sealing cover 4 to be connected with the front board 6;
the hydrophone element ring joint 13 is connected with the front panel joint 14 through a lead 15, and the electric signals converted by the hydrophone element ring 2 are transmitted to the front panel 6;
the front board 6 is arranged in the electronic cabin cavity 5, and the front board 6 is loaded with an amplifying circuit and a filtering circuit and is used for amplifying, filtering and conditioning the received electric signals;
the front board support 7 is used for supporting the front board 6 and avoiding the front board 6 from contacting with the electronic cabin cavity 5;
the cable joint 11 comprises a power circuit and a signal circuit; the power supply circuit is connected with a power supply circuit of the underwater mobile platform and used for converting voltage provided by the underwater mobile platform into voltage required by the hydrophone; the signal line is connected with a signal acquisition circuit of the underwater mobile platform and is used for transmitting the amplified, filtered and conditioned signal to the signal acquisition circuit of the underwater mobile platform;
an opening is formed in the tail of the electronic cabin cavity 5; the cable 10 penetrates through the opening, one side of the cable is connected with a power supply inside the cable joint 11, and the other side of the cable is connected with the front board 5 and used for transmitting the converted voltage to the hydrophone so as to support the hydrophone to work;
the potting structure 12 is an area included by a dotted line in the figure and is formed by pouring a potting material and then solidifying the potting material; the encapsulating structure 12 integrally wraps the hydrophone elements and is used for ensuring water tightness;
the hydrophone basic ring 2, the hydrophone element sealing cover 3 and the electronic cabin cavity sealing cover 4 form an air cavity;
the watertight plug 9 is vulcanized with the outer layer of the cable 10 and is used for ensuring the water tightness of the opening at the tail part of the electronic cabin cavity 5;
and the fastening end cover 8 is screwed outside the watertight plug 9 and is used for preventing the watertight plug from falling off.
The hydrophone shown in FIG. 2 is mounted in the acoustically transparent chamber section 17 shown in FIG. 1 and is connected to the watertight fitting 16 of FIG. 1 by a cable fitting 11. Meanwhile, other functional modules in the hydrophone electronic cabin realize the functions of amplifying, filtering and transmitting the acquired data.
The structural and functional functions of the parts in fig. 2 are as follows:
potting structure 12, watertight for the hydrophone elements and polyurethane outside the electronics compartment cavity 5: adopts polyether polyurethane or rubber, has low water permeability and good sound permeability
Front panel 6: the amplification and the filtering of the picked acoustic signals are finished, and the signal transmission driving capability is enhanced
Front panel bracket 7: the light structure ensures that the front panel 6 does not contact with the electronic cabin cavity 5 to cause short circuit
The material of the shielding mesh 1 is copper mesh: the red copper material has the function of shielding electromagnetic noise
The material of the hydrophone-based ring 2 is a piezoelectric sensing material: active materials, core devices of hydrophones, acoustic sensing;
the materials of the hydrophone element cover 3 and the electronic cabin cavity cover 4 are composite materials: the piezoelectric sensing material and the hydrophone element are formed together
The electronic compartment cavity 5: metal material for placing front discharge circuit and providing certain voltage resistance and shielding property
Watertight plug 9: vulcanize with the cable 10 to form a watertight joint, ensuring watertightness
Fastening the end cap 8: is equivalent to a screw sleeve, and ensures that the watertight plug 9 can not fall off to cause the hydrophone to enter water
Cable joint 11: the internal part comprises a power line, a signal line (single end or differential), and a ground line
As shown in fig. 3, a connection structure block diagram is formed by main functional modules of the near-zero buoyancy hydrophone. In the figure, each module is packaged together by using a watertight structure and waterproof glue, and is connected with the electronic cabin through a watertight connector. The sound sensitive material picks up sound signals, the sound signals are amplified and filtered by the signal conditioning circuit and sent to the peripheral interface module for signal interface matching, meanwhile, the peripheral interface module connects a power supply provided by the mobile platform into the power supply module, the power supply module converts the power supply into required voltage, and the required voltage is stabilized to supply power for the signal elevator module and the peripheral interface module. The power module has overvoltage protection and overcurrent detection functions. The watertight cabin body is combined with the piezoelectric sensing material of the sensing module, and an air cavity is formed after the watertight cabin body is integrally packaged according to the actual working frequency band of the hydrophone, so that the realization of various working parameters of the near-zero buoyancy hydrophone is guaranteed.
FIG. 4 is a schematic structural diagram of a hydrophone base-membered ring, wherein the hydrophone base-membered ring in FIG. 4(a) is a single sensor base-membered ring, the hydrophone base-membered ring in FIG. 4(b) is a composite sensor base-membered ring formed by two single sensor base-membered rings connected in parallel, and the hydrophone base-membered ring in FIG. 4(c) is a composite sensor base-membered ring formed by two single sensor base-membered rings connected in series. These different combined designs can meet the different performance requirements of the hydrophone.
In general, a person skilled in the art can select each element constituting each unit according to actual needs, and in this embodiment, the circular ring of PZT5 used by the sensing module is connected in series or in parallel as the sound sensitive material, and the circular ring is a core signal pickup unit of the sensing module of the present invention, and is responsible for collecting acoustic signals in the surrounding environment without distortion and outputting the acoustic signals to other modules. The models of operational amplifiers used in the signal conditioning module are OP2177, OPA2422 and a diode is EN5819, and by taking the operational amplifiers as a core, the signal conditioning module realizes the construction of an amplifying circuit and a filter circuit, completes the signal conditioning of the collected sound signals, and can be realized by selecting a high-precision resistor with precision superior to 0.5 percent and a capacitor with precision superior to 5 percent. The peripheral interface module uses high-precision resistance with precision superior to 0.5 percent and capacitance with precision superior to 5 percent to realize signal matching with a connection acquisition circuit, a watertight electronic cabin cavity in the module is made of TC4 material or POM material, and simultaneously, a power supply is introduced by connecting a watertight connector and is sent to a power supply module. The power supply module converts an input power supply into actually required voltage, and realizes voltage and current control, and the model number of the power supply module is max1776, TPS76333 and 1N 4001.
It can be seen from the above detailed description of the invention that the near-zero buoyancy hydrophone provided by the invention can be installed on an underwater mobile platform to realize autonomous operation work and transmit acquired acoustic signals in real time without distortion.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A near-zero-buoyancy hydrophone for an underwater mobile platform, the hydrophone comprising: the device comprises a sensing module, a signal conditioning module, a signal transmission module and a potting structure (12), wherein the sensing module is connected with the signal conditioning module through a front board joint (14) and transmits generated electric signals to the signal conditioning module; the signal conditioning module is used for processing the received electric signals; the signal transmission module is used for transmitting the processed electric signal to the underwater mobile platform; it is characterized in that the preparation method is characterized in that,
the sensing module includes: a hydrophone-based ring (2); the hydrophone base-member ring (2) is used for picking up acoustic signals and converting the acoustic signals into electric signals;
two sides of the hydrophone base-shaped ring (2) are respectively provided with a hydrophone element sealing cover (3), and two groups of hydrophone element ring joints (13) are arranged on one hydrophone element sealing cover (3); one end of the hydrophone element ring joint (13) penetrates through the hydrophone element sealing cover (3) to be connected with the hydrophone base-shaped ring (2), and the other end of the hydrophone element ring joint is respectively connected with the two groups of front panel joints (14) through leads (15);
the hydrophone base-member ring (2) and the outer layer of the hydrophone element sealing cover (3) are wrapped with a layer of shielding net (1), and the shielding net (1) is used for shielding electromagnetic interference;
the encapsulating structure (12) is used for hermetically wrapping the space outside the shielding net (3) and the lead (15) and ensuring the integral water tightness, and meanwhile, an air cavity is formed between the hydrophone-based ring (2) and the hydrophone element sealing cover (3), the hydrophone element ring joint (13), the front panel joint (14) and the lead (15); and the air cavity is used for constructing a sound field environment and adjusting the overall density of the hydrophone.
2. The near-zero-buoyancy hydrophone for the underwater mobile platform according to claim 1, wherein the hydrophone-based ring (2) is in a circular ring shape and comprises a single-sensing-based ring or a composite-sensing-based ring formed by combining a plurality of single-sensing-based rings in series and in parallel, and the material of the hydrophone-based ring is a novel piezoelectric sensing material and comprises: lead zirconate titanate piezoelectric ceramic pzt.
3. The near-zero-buoyancy hydrophone for an underwater mobile platform of claim 1, wherein the signal conditioning module comprises: a front board (6); the front board (6) is provided with an amplifying circuit and a filtering circuit for amplifying, filtering and conditioning the received electric signals.
4. The near-zero-buoyancy hydrophone for the underwater mobile platform according to claim 3, wherein the front plate (6) is mounted on a front plate support (7) and arranged inside the electronic cabin cavity (5); the electronic cabin cavity (5) is a watertight cabin body and is used for ensuring the watertightness; the front plate support (7) is used for supporting the front plate (6) to avoid the contact between the front plate (6) and the interior of the electronic cabin cavity (5).
5. The near-zero-buoyancy hydrophone for the underwater mobile platform according to claim 4, wherein an electronic cabin cavity cover (4) is arranged on one side of the electronic cabin cavity (5); the front board joint (14) penetrates through the electronic cabin cavity sealing cover (4) and is connected with the hydrophone-based ring (2) and the front board (6) through a lead (15) and a hydrophone-based ring joint (13); an opening is formed in the other side of the electronic cabin cavity (5), and the front board (6) penetrates through the opening through a cable to be connected with the signal transmission module;
a watertight plug (9) is arranged outside one side of the electronic cabin cavity (5) provided with the opening, and the watertight plug (9) is vulcanized with the outer layer of the cable at the opening and is used for ensuring the water tightness of the opening at the tail part of the electronic cabin cavity (5);
and a fastening end cover (8) is screwed on the outer side of the watertight plug (9) and is used for preventing the watertight plug (9) from falling off.
6. The near-zero-buoyancy hydrophone for the underwater mobile platform according to claim 4, wherein the top end of the electronic cabin cavity (5) close to one side of the front panel joint (14) is machined to form a plurality of circles of circular ring-shaped vulcanization grooves for preventing the potting structure (12) from falling off.
7. The near-zero-buoyancy hydrophone for an underwater mobile platform of claim 1, wherein the signal transmission module comprises: a cable (10) and a cable joint (11); the cable joint (11) comprises a power line and a signal line; the power supply circuit is connected with a power supply circuit of the underwater mobile platform and used for converting voltage provided by the underwater mobile platform into voltage required by the hydrophone; the signal line is connected with a signal acquisition circuit of the underwater mobile platform and is used for transmitting the amplified, filtered and conditioned signal to the signal acquisition circuit of the underwater mobile platform.
8. The near-zero-buoyancy hydrophone for the underwater mobile platform according to claim 7, wherein the power supply circuit selects a low-power low-noise power supply, and the signal circuit selects a high-precision resistor and a high-precision capacitor to realize signal matching with a signal acquisition circuit of the underwater mobile platform.
9. The near-zero-buoyancy hydrophone for underwater mobile platforms of any of claims 1-8, wherein the potting structure (12) is a low water permeability and high acoustic permeability material comprising: polyurethane or rubber; the hydrophone element sealing cover (3) and the electronic cabin cavity sealing cover (4) are made of composite insulating materials, and the electronic cabin cavity (5) is made of the following materials: titanium alloy or polyoxymethylene plastic; an amplifier used by an amplifying circuit carried on the front board (5) is a low-power-consumption operational amplifier; the shielding net (1) and the fastening end cover (8) are made of metal and comprise: copper, titanium, aluminum and alloy materials.
10. A near-zero buoyancy hydrophone system for an underwater mobile platform as claimed in any of claims 1-8, wherein the system comprises a sensing module, a signal conditioning module, a peripheral interface module, a watertight connector, and a power module; the peripheral interface module and the watertight connector form a signal transmission module;
the sensing module comprises a hydrophone base-ring and is used for picking up acoustic signals, converting the acoustic signals into electric signals and transmitting the electric signals to the signal conditioning module; the sensing module is packaged to form an air cavity which is used for constructing a sound field environment and adjusting the density of the hydrophone;
the signal conditioning module is used for amplifying, filtering and conditioning the electric signals transmitted by the sensing module;
the peripheral interface module is respectively connected with the watertight connector and the signal conditioning module and is used for transmitting the conditioned electric signals to the watertight connector;
the watertight connector is respectively connected with the underwater mobile platform, the peripheral interface module and the power supply module, is used for transmitting the voltage provided by the underwater mobile platform to the power supply module, is also used for matching an electric signal transmitted by the peripheral interface module with an acquisition circuit of the underwater mobile platform, and transmits the electric signal after matching is finished;
and the power supply module is used for converting the voltage transmitted by the watertight connector into the voltage required by the hydrophone, and performing disconnection processing by the power supply module when the input voltage and current exceed the normal range.
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| CN202210341574.XA CN114777907A (en) | 2022-04-02 | 2022-04-02 | Near-zero buoyancy hydrophone for underwater mobile platform and system thereof |
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| CN202210341574.XA CN114777907A (en) | 2022-04-02 | 2022-04-02 | Near-zero buoyancy hydrophone for underwater mobile platform and system thereof |
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