Underwater multi-physics field data acquisition system

Abstract

The invention relates to the technical field of target detection equipment, in particular to an underwater multi-physics field data acquisition system. The device is mounted on an instrument end cover and assembled with a water lightning body; the electric field sensor is installed on the installation frame and externally connected with one end of the electric field watertight cable, the electric field watertight cable is installed on a watertight connector on the instrument end cover, and the other end of the electric field watertight cable is connected with the electric field conditioning module. The mounting rack is connected with the mounting base through a screw rod, and the mounting base is connected with the instrument end cover through a base mounting screw hole; the data acquisition bottom plates are connected with the instrument end cover through mounting rods, a data acquisition module and a seismic wave conditioning module are mounted above one data acquisition bottom plate, another data acquisition bottom plate is mounted above the seismic wave conditioning module, and an electric field conditioning module and a sensor battery pack are mounted above the other data acquisition bottom plate. Compared with an original data acquisition system, a potential new physical field is added to deal with the problem of lack of recognition precision after ship / submarine noise elimination and demagnetization.

Description

Technical Field

[0001] This invention relates to the field of target detection equipment technology, and more specifically, to an underwater multiphysics data acquisition system. Background Technology

[0002] Naval mines, with their long-term stealth, autonomous detection, autonomous attack, and high cost-effectiveness, will play an indispensable role in future naval warfare and have a significant impact on the execution of maritime blockade and counter-blockade missions. As China's national strength continues to grow, the mission of the Chinese Navy faces new challenges, placing higher demands on naval mines. The problem of insufficient autonomous detection capabilities of naval mines during underwater detection is gradually becoming apparent. Improving the detection accuracy and range of existing naval mines while maintaining their small size and long operating time has become a primary objective.

[0003] To improve the accuracy and range of mine detection, the key lies in extracting the navigation characteristics of underwater targets. During navigation, these targets generate various physical fields, including radiated noise fields, water pressure fields, electric fields, magnetic fields, seismic wave fields, and gravitational fields, each with its own inherent characteristics. Currently, foreign surface ship databases offer a wide variety of target types, comprehensive characteristic parameters, and abundant data resources. In particular, the United States has established a target characteristic database by utilizing data and characteristics of various physical fields, such as environmental and ship acoustic fields, magnetic fields, pressure fields, electric fields, seismic waves, and gravitational fields, obtained through fixed and mobile measurement systems.

[0004] Depending on the application scenario of naval mines, the physical field of mines has evolved from a single acoustic fuse to a multi-physical field combined fuse involving acoustic, magnetic, and water pressure. However, with the emergence of acoustic stealth technology for surface ships, ultra-quiet underwater vehicles, and non-magnetic silent submarines, traditional physical fields such as acoustic, magnetic, and water pressure are insufficient for identifying, locating, and striking these new targets. Therefore, there is an urgent need for a multi-target detection method based on new physical fields such as electric fields and seismic wave fields combined with traditional detection methods to overcome the problem of being unable to strike weak underwater / surface targets in complex sea conditions. Summary of the Invention

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the objective of this invention is to propose an underwater multiphysics data acquisition system that collects underwater acoustic, magnetic, water pressure, seismic wave, and electric field data, providing data support for the underwater detection of weak signals.

[0006] To achieve the above and other related objectives, the present invention provides an underwater multiphysics data acquisition system, comprising: The instrument end cap is assembled with the mine body; An electric field sensor is mounted on a mounting bracket. One end of the electric field sensor is externally connected to a watertight electric field cable, which is installed on a watertight connector on the end cap of the instrument. The other end is connected to an electric field conditioning module. The mounting bracket is connected to the mounting base via screws, and the mounting base is connected to the instrument end cap via mounting screw holes on the base. A data acquisition base plate is connected to the instrument end cap via a mounting rod. A data acquisition module and a seismic wave conditioning module are mounted on one of the data acquisition base plates. Another data acquisition base plate is mounted on top of the seismic wave conditioning module. An electric field conditioning module and a sensor battery pack are mounted on top of the other data acquisition base plate.

[0007] In one embodiment of the present invention, a protective sleeve is installed on the head of the electric field sensor.

[0008] In one embodiment of the present invention, six electric field sensors are provided, which are arranged in three groups and installed orthogonally in pairs to form an O-XYZ three-axis orthogonal coordinate system.

[0009] In one embodiment of the present invention, the orthogonality error among OX, OY, and OZ is less than 0.5°.

[0010] In one embodiment of the present invention, it further includes: An acoustic sensor is mounted on the end cap of the instrument, forming a watertight structure through a pressure ring and a sealing ring.

[0011] In one embodiment of the present invention, it further includes: A water pressure hole is installed on the end cap of the instrument, and the water pressure hole is a threaded through hole.

[0012] In one embodiment of the present invention, it further includes: An internal water pressure sensor is mounted on the end cap of the instrument, and the internal water pressure sensor forms a watertight structure with threads and a sealing ring.

[0013] In one embodiment of the present invention, it further includes: The seismic wave sensor and data acquisition battery pack are both fixed inside the end cover compartment of the instrument.

[0014] In one embodiment of the present invention, the data acquisition module is a 32-channel 32-bit dual ADC acquisition module.

[0015] In one embodiment of the present invention, the electric field sensor employs an Ag-AgCl electrode.

[0016] As described above, the underwater multiphysics data acquisition system of the present invention has the following beneficial effects: The present invention discloses an underwater multiphysics data acquisition system that collects underwater acoustic, magnetic, water pressure, seismic waves and electric fields, providing data support for the underwater detection of weak signals. Compared with the original data acquisition system, it adds potential new physical fields to address the problem of loss of identification accuracy after the silencing and demagnetization of ships / submarines.

[0017] The present invention provides an underwater multiphysics field data acquisition system, which provides a complete data acquisition system to provide data support for the development of combined acoustic, magnetic, water pressure, electric field and seismic wave field fuses for mines.

[0018] This invention discloses an underwater multiphysics data acquisition system, providing a new detection method for underwater targets and offering structural, theoretical, and data support for novel sea mines. The system is simple to deploy and recover, and can be fixed in a specific location to collect data from surface / underwater targets. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an underwater multiphysics data acquisition system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of an electric field sensor in an underwater multiphysics data acquisition system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the electric field conditioning module of an underwater multiphysics data acquisition system according to an embodiment of the present invention.

[0020] The components are: 1-mounting bracket, 2-electric field sensor, 3-protective pressure sleeve, 4-electric field watertight cable, 5-mounting base, 6-base mounting screw hole, 7-acoustic sensor, 8-water pressure hole, 9-lifting ring, 10-instrument end cap, 11-water pressure sensor, 12-seismic wave sensor, 13-data acquisition battery pack, 14-mounting rod, 15-data acquisition base plate, 16-data acquisition module, 17-seismic wave conditioning module, 18-electric field conditioning module, 19-sensor battery pack. Detailed Implementation

[0021] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0022] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0023] Terms such as "first" or "second" may be used to describe various components, but these components are not limited by the terms described above. The terms described above are used to distinguish one component from another; for example, without departing from the scope of the concept according to this disclosure, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component.

[0024] Furthermore, "connected / linked" indicates that one component is directly electrically connected to another component or indirectly electrically connected through another component. Unless otherwise explicitly stated in the sentence, the singular form may include the plural form. Additionally, the terms "comprising / including" or "containing / including" as used in this specification indicate the presence or addition of one or more components, steps, operations, and elements. Specific structural or functional descriptions of examples of embodiments of the concepts disclosed in this specification are merely illustrative to describe examples of embodiments of the concepts, and examples of embodiments of the concepts can be implemented in various forms, but these descriptions are not limited to the examples of embodiments described in this specification.

[0025] Based on the concept, various modifications and changes can be applied to examples of embodiments, such that examples of embodiments will be illustrated in the accompanying drawings and described in the specification. However, examples of embodiments based on the concept are not limited to specific embodiments, but include all changes, equivalents, or substitutions included within the spirit and scope of this disclosure.

[0026] It should be understood that when describing an element as "connected" or "linked" to another element, the element may be directly connected or linked to the other element, or it may be connected or linked to the other element via a third element. Conversely, it should be understood that when an element is described as "directly connected to" or "directly linked to" another element, no other element is placed between them. Other expressions describing relationships between components (i.e., "between" and "directly between" or "adjacent to" and "directly adjacent to") need to be interpreted in the same way.

[0027] The terminology used in this specification is for the purpose of describing specific examples of implementations only and is not intended to limit this disclosure. The singular form may include the plural form unless there is an explicit contrary meaning in the context. It should be understood in this specification that the terms "comprising" or "having" indicate the presence of the features, quantities, steps, operations, components, parts, or combinations thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, quantities, steps, operations, components, parts, or combinations thereof.

[0028] Unless otherwise defined, all terms used herein (including technical or scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art. If a term is not clearly defined in a common dictionary in this specification, it shall be interpreted as having the same meaning as in the context of the relevant art, and not as an ideal or overly formal meaning.

[0029] Descriptions of known components and processing techniques may be omitted to avoid unnecessarily obscuring the embodiments of this disclosure.

[0030] Throughout this specification, the same reference numerals refer to the same elements. Therefore, even if a reference numeral is not mentioned or described with reference to one drawing, it may be mentioned or described with reference to another drawing. Furthermore, even if a reference numeral is not shown in one drawing, it may be mentioned or described with reference to another drawing.

[0031] Additionally, the logic level of a signal may be different from or opposite to the logic level described. For example, a signal described as having a logic "high" level may optionally have a logic "low" level, and a signal described as having a logic "low" level may optionally have a logic "high" level.

[0032] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0033] Please see Figure 1 , Figure 1 This is a schematic diagram of an underwater multiphysics data acquisition system according to an embodiment of the present invention. The present invention provides an underwater multiphysics data acquisition system that collects underwater acoustic, magnetic, water pressure, seismic wave, and electric field data, providing data support for the underwater detection of weak signals, including: The instrument end cap 10 is assembled with the mine body; An electric field sensor 2 is mounted on a mounting bracket 1. One end of the electric field sensor 2 is externally connected to a watertight electric field cable 4, which is mounted on a watertight connector on the instrument end cap 10. The other end is connected to an electric field conditioning module 18. Mounting bracket 1 is connected to mounting base 5 via screws, and mounting base 5 is connected to instrument end cap 10 via base mounting screw holes 6; A data acquisition base plate 15 is connected to the instrument end cap 10 via a mounting rod 14. A data acquisition module 16 and a seismic wave conditioning module 17 are mounted on one of the data acquisition base plates 15. Another data acquisition base plate 15 is mounted on the seismic wave conditioning module 17. An electric field conditioning module 18 and a sensor battery pack 19 are mounted on the other data acquisition base plate 15.

[0034] Specifically, a protective sleeve 3 is installed on the head of the electric field sensor 2. Six electric field sensors 2 are arranged in three groups, orthogonally mounted in pairs, forming an O-XYZ three-axis orthogonal coordinate system. The orthogonality error between the OX, OY, and OZ axes is less than 0.5°. Specifically, the underwater multiphysics data acquisition system of the present invention further includes: an acoustic sensor 7 mounted on the instrument end cap 10, forming a watertight structure through a pressure ring and a sealing ring; a water pressure hole 8 mounted on the instrument end cap 10, wherein the water pressure hole 8 is a threaded through hole; an internal water pressure sensor 11 mounted on the instrument end cap 10, wherein the internal water pressure sensor 11 forms a watertight structure through threads and a sealing ring; and a fixed seismic wave sensor 12 and a data acquisition battery pack 13 both fixed inside the instrument end cap 10.

[0035] The underwater multiphysics data acquisition system of the present invention upgrades the existing underwater acquisition system by adding a variety of physical field data acquisition devices to collect underwater information, collect data from surface ships and submarines, and provide data support for mine development.

[0036] This invention relates to an underwater multiphysics data acquisition system. By measuring acoustic, three-axis magnetic, water pressure, three-axis electric, and three-axis seismic wave fields of surface / underwater ships, it further explores existing multiphysics target detection methods. New physical fields, such as electric and seismic wave fields, are incorporated into the data acquisition system. Targeting existing noise reduction and degaussing technologies for ships and submarines, a new physical field network for target detection is established, providing new detection methods for underwater targets and structural, theoretical, and data support for new types of mines. This system is simple to deploy and recover, and can be fixed in a specific location to collect data from surface / underwater targets.

[0037] In one embodiment of the present invention, the underwater multiphysics data acquisition system provided by the present invention includes a mounting frame 1, an electric field sensor 2, a protective sleeve 3, an electric field watertight cable 4, a mounting base 5, a base mounting screw hole 6, an acoustic sensor 7, a water pressure hole 8, a lifting ring 9, an instrument end cap 10, a water pressure sensor 11, a seismic wave sensor 12, a data acquisition battery pack 13, a mounting rod 14, a data acquisition base plate 15, a data acquisition module 16, a seismic wave conditioning module 17, an electric field conditioning module 18, and a sensor battery pack 19.

[0038] like Figure 1 As shown, in one embodiment of the present invention, the underwater multiphysics data acquisition system of the present invention utilizes a mine body. The instrument end cap 10 is assembled with the mine body. Six triaxial electric field sensors are installed externally on the end cap, divided into three groups, orthogonally installed in pairs to form a 0XYZ triaxial orthogonal coordinate system. The orthogonality error between the axes 0X, 0Y, and 0Z is required to be less than 0.5°. Electric field sensor 2 is installed on the mounting frame 1 to ensure its positioning accuracy. A protective pressure sleeve 3 is installed on its head, which protects the electrode during deployment and retrieval. The external connecting cable of the electric field sensor is vulcanized and installed on a watertight connector on the instrument end cap 10. The other side is connected to the electric field conditioning module 18. The mounting frame 1 and the mounting base 5 are connected by screws. The mounting base 4 and the instrument end cap 10 are connected through the base mounting screw hole 6. The acoustic sensor 7 is installed on the instrument end cap 10, forming a watertight structure through a pressure ring and a sealing ring. The water pressure hole 8 is a threaded through hole on the instrument end cap 10. The internal water pressure sensor... The device 11 forms a watertight structure with threads and sealing rings. The seismic wave sensor 12 and the data acquisition battery pack 13 are fixed inside the instrument end cover 10. The data acquisition battery pack can ensure that the 32-channel data acquisition module 16 can work stably and continuously for more than 120 hours. The battery shell has sufficient mechanical strength to protect the battery from mechanical impact, and there is sufficient insulation between the battery and the lead wire for safety protection. The data acquisition base plate 15 is connected to the instrument end cover 10 through the mounting rod 14. The data acquisition module 16 and the seismic wave conditioning module 17 are installed on the top, and the electric field conditioning module 18 and the sensor battery pack 19 are installed on the top.

[0039] In one embodiment of the present invention, the data acquisition module 16 is a 32-channel 32-bit dual ADC acquisition module, made of high-strength aluminum alloy with surface oxidation treatment, possessing robust, corrosion-resistant, splash-proof, and dustproof properties, suitable for various complex environments, and ensuring the stability of data acquisition and measurement. An acoustic sensor, a triaxial magnetic sensor, a water pressure sensor, an electric field conditioning module, and a seismic wave conditioning module are sequentially connected to the data acquisition module. The acoustic sensor is an omnidirectional receiving transducer, and its conditioning module is integrated into the sensor to achieve impedance matching and broadband preamplification. The magnetic sensor uses a triaxial fluxgate sensor, which must be kept away from magnets or working coils during installation and measurement to prevent magnetization of the magnetic probe. A piezoelectric ceramic sheet is used for water pressure field measurement. After the water mine cloth is placed in water, the focus is on the dynamic pressure characteristic; the static pressure is not related to the target characteristics, thus eliminating the influence of hydrostatic pressure. The sensor uses a triaxial piezoelectric accelerometer, and the back-end conditioning circuit is designed with low power consumption and low noise based on the signal characteristics and signal strength of the ship's seismic wave field. The electric field sensor uses Ag-AgCl electrodes, with four electrodes orthogonally mounted and two axially mounted. These electrodes are differentially arrayed in pairs to form an electric field detection array in three orthogonal directions. (See [link to relevant documentation]). Figure 2 The signal collected by the electric field sensor needs to be processed by the electric field conditioning module, and its circuit diagram is as follows. Figure 3 As shown, a preamplifier circuit is connected to the silver-silver chloride electrode array. The preamplifier circuit performs impedance transformation and signal pre-amplification. After the two electrode signals are processed by the preamplifier circuit, they enter the differential circuit to obtain the potential difference between two points along one axis of the electric field. Since the distance between the electrodes is constant, the measured potential difference reflects the change in field strength, i.e., the electric field signal is obtained. The data acquisition device has functions such as acquisition, parameter setting, timing, parameter saving, and timed data acquisition and storage. It is deployed and fixed in a certain sea area, and the data acquisition time is set. After the target passes, the corresponding data is retrieved.

[0040] The underwater multiphysics data acquisition system of the present invention classifies existing sensors and, based on the characteristics of physical field data acquisition, deploys monoacoustic sensors, water pressure sensors, and triaxial electric field sensors on the outside of the hull, while installing triaxial magnetic sensors and triaxial seismic wave sensors on the inside of the hull. The external sensors are connected to the inside of the hull via watertight cables. The layout of the external components is symmetrical, and a counterweight is installed at the stern of the hull. The acquisition system maintains good underwater attitude.

[0041] This invention relates to an underwater multiphysics data acquisition system. In addition to the existing acoustic, triaxial magnetic, and hydraulic pressure physical fields, it adds triaxial electric field and triaxial seismic wave field data acquisition. Due to the different acquisition characteristics, the triaxial seismic wave sensor needs to be installed inside the cabin and connected to the hull, while the triaxial electric field sensor needs to be installed outside the cabin, ensuring that the three pairs of sensors are placed perpendicularly at 90° along the X, Y, and Z axes to guarantee data acquisition quality. This invention installs the seismic wave sensor inside the cabin using a threaded connection, and uses a mounting bracket and protective cap to effectively protect the electric field sensor.

[0042] In summary, the underwater multiphysics data acquisition system of this invention collects underwater acoustic, magnetic, water pressure, seismic wave, and electric field data, providing data support for the underwater detection of weak signals. Compared with existing data acquisition systems, it adds potential new physical fields to address the problem of lost identification accuracy after ship / submarine silencing and degaussing. This invention provides a complete data acquisition system, providing data support for the development of mine fuses that combine acoustic, magnetic, water pressure, electric field, and seismic wave fields.

[0043] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An underwater multiphysics data acquisition system, characterized in that, include: The instrument end cap (10) is assembled with the mine body; An electric field sensor (2) is mounted on a mounting bracket (1). One end of an electric field watertight cable (4) is externally connected to the electric field sensor (2). The electric field watertight cable (4) is mounted on a watertight connector on the end cap (10) of the instrument. The other end is connected to the electric field conditioning module (18). Mounting bracket (1) is connected to mounting base (5) by screws, and mounting base (5) is connected to instrument end cap (10) by mounting screw hole (6); A data acquisition base plate (15) is connected to the instrument end cap (10) via a mounting rod (14). A data acquisition module (16) and a seismic wave conditioning module (17) are installed on one of the data acquisition base plates (15). Another data acquisition base plate (15) is installed on the seismic wave conditioning module (17). An electric field conditioning module (18) and a sensor battery pack (19) are installed on the other data acquisition base plate (15).

2. The underwater multiphysics data acquisition system according to claim 1, characterized in that: The head of the electric field sensor (2) is fitted with a protective sleeve (3).

3. The underwater multiphysics data acquisition system according to claim 1, characterized in that: The electric field sensor (2) is provided in 6 units, which are divided into three groups and installed orthogonally in pairs to form an O-XYZ three-axis orthogonal coordinate system.

4. The underwater multiphysics data acquisition system according to claim 3, characterized in that: The orthogonality error between OX, OY, and OZ is less than 0.5°.

5. The underwater multiphysics data acquisition system according to claim 1, characterized in that, Also includes: The acoustic sensor (7) is mounted on the end cap (10) of the instrument and forms a watertight structure through a pressure ring and a sealing ring.

6. The underwater multiphysics data acquisition system according to claim 1, characterized in that, Also includes: Water pressure hole (8) is installed on the end cap (10) of the instrument. The water pressure hole (8) is a threaded through hole.

7. The underwater multiphysics data acquisition system according to claim 1, characterized in that, Also includes: The chamber water pressure sensor (11) is mounted on the end cap (10) of the instrument. The chamber water pressure sensor (11) forms a watertight structure with threads and a sealing ring.

8. The underwater multiphysics data acquisition system according to claim 1, characterized in that, Also includes: The seismic wave sensor (12) and the data acquisition battery pack (13) are both fixed inside the instrument end cap (10).

9. The underwater multiphysics data acquisition system according to claim 1, characterized in that: The data acquisition module (16) is a 32-channel 32-bit dual ADC acquisition module.

10. The underwater multiphysics data acquisition system according to claim 1, characterized in that: The electric field sensor (2) uses an Ag-AgCl electrode.

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