Self-sinking and floating type ocean bottom seismograph based on MEMS accelerometer

Abstract

The utility model discloses a self-sinking and floating type ocean bottom seismograph based on an MEMS accelerometer, and specifically relates to a self-sinking and floating type ocean bottom seismograph comprising a cabin body which is divided into a first buoyancy cabin and a second buoyancy cabin which are sequentially distributed along the vertical direction according to the structure; the first buoyancy compartment and the second buoyancy compartment intersect with each other to form a compartment clamping cavity, and an underwater acoustic pressure sensor, an MEMS accelerometer and a seismograph sensor are arranged in the compartment clamping cavity; a mounting cylinder distributed along the axis is fixedly arranged on the outer wall of the second buoyancy compartment, and a counterweight module is in threaded connection with the mounting cylinder. According to the utility model, water pressure data and attitude data of the water level where the self-sinking and floating type ocean bottom seismograph is located and data for monitoring and recording ocean bottom earthquake activities are obtained through the underwater sound pressure sensor, the MEMS accelerometer and the seismograph sensor.

Description

Technical Field

[0001] This utility model relates to a self-sinking and floating seabed seismograph, specifically a self-sinking and floating seabed seismograph based on a MEMS accelerometer. Background Technology

[0002] MEMS accelerometers, as miniature sensors based on microelectromechanical systems (MEMS) technology, can measure the acceleration of an object in a specific direction, which is crucial for determining the object's attitude (such as tilt angle). In devices such as drones, robots, and game controllers, the key data provided by accelerometers helps achieve precise attitude control and navigation.

[0003] The working principle of a self-sinking and floating seabed seismograph (OBS) is relatively simple yet highly efficient. During deployment, the instrument is connected to a launch platform, and the weight of the launch platform causes the buoyant OBS to freely descend to the seabed to record data. After completing the planned mission, an acoustic command is sent from the ship to disconnect the launch platform from the OBS, which then floats to the surface using its own buoyancy for recovery.

[0004] Its main applications are in the following areas:

[0005] Earthquake monitoring: Data can be used to monitor and record submarine seismic activity, helping scientists understand the patterns of earthquake occurrence and the characteristics of seismic zones, thereby improving earthquake early warning and prediction capabilities.

[0006] Seafloor geological surveys help scientists explore the structure, topography, and geological features of the seafloor crust, providing important data support for research on seafloor geological evolution and resource distribution.

[0007] Submarine volcano research: It can be used to monitor the seismic activity and eruptions of submarine volcanoes, helping scientists to study the formation mechanisms and activity patterns of submarine volcanoes.

[0008] Marine geophysical exploration, such as seabed topography mapping and crustal structure detection, provides important data support for marine resource development and marine environmental protection.

[0009] In the prior art, including the aforementioned patents, there is a pressing need to effectively transmit the attitude changes caused by the seabed topography during the descent of a self-sinking and floating seabed seismograph back to the acquisition terminal. Utility Model Content

[0010] The purpose of this invention is to provide a self-sinking and floating seabed seismograph based on a MEMS accelerometer to solve the above-mentioned problems.

[0011] To achieve the above objectives, this utility model provides the following technical solution:

[0012] A self-sinking and floating seabed seismograph based on MEMS accelerometer includes a cabin, which is structurally divided into a first buoyancy cabin and a second buoyancy cabin distributed sequentially along the vertical direction.

[0013] The first buoyancy chamber and the second buoyancy chamber intersect to form a clamping cavity, which is equipped with a hydroacoustic pressure sensor, a MEMS accelerometer and a seismograph sensor.

[0014] The outer wall of the second buoyancy chamber is fixedly provided with mounting cylinders distributed along the axis, and counterweight modules are threadedly connected to the mounting cylinders.

[0015] Preferably, the first buoyancy chamber is fixedly equipped with dual GPS / satellite communication antennas distributed along the central axis.

[0016] Preferably, the first buoyancy chamber and the second buoyancy chamber include a fusion sidelobe chamber, and the clamping cavity is located inside the fusion sidelobe chamber;

[0017] The first buoyancy chamber includes an upper side lobe chamber, and the second buoyancy chamber includes a lower side lobe chamber;

[0018] The upper side lobe compartment, the lower side lobe compartment, and the fusion side lobe compartment are all fixedly provided with extended web members on their opposite sides, and are fixed together by bolts passing through the extended web members.

[0019] Preferably, the mounting cylinder extends to the top of the first buoyancy chamber with an open top, and the outer wall of the mounting cylinder located in the second buoyancy chamber has air vents arranged in a circumferential array.

[0020] Preferably, a limiting plate is fixedly installed inside the mounting cylinder near the opening, and a rectangular guide rod is also included, which is slidably fitted onto the limiting plate.

[0021] A sealing plate embedded in the opening is fixedly installed at one end of the rectangular guide rod, and a limit block is fixedly installed at the other end.

[0022] An equidistant spring is provided between the limiting block and the limiting plate, and is sleeved on the rectangular guide rod.

[0023] Preferably, the equidistant spring has a tapered profile structure, and the tapered profile includes a narrow opening and a wide opening, with the wide opening abutting against the limiting plate.

[0024] Preferably, the counterweight module includes a threaded outer seat that is threadedly connected to the mounting cylinder, and an inflation system that can be embedded in the mounting cylinder is inserted into the threaded outer seat.

[0025] Preferably, the inflation system includes a filter, a sodium azide ring block disposed on the inner wall of the filter, and an igniter extending into the sodium azide ring block.

[0026] In the above technical solution, the self-floating seabed seismograph based on a MEMS accelerometer provided by this utility model has the following beneficial effects: the outer shell of the self-floating seabed seismograph is composed of a vertically arranged first buoyancy chamber and a second buoyancy chamber, and the center of gravity of the self-floating seabed seismograph is located on the perpendicular line between the axes of the first buoyancy chamber and the second buoyancy chamber through a counterweight module. Simultaneously, it acquires water pressure data, attitude data, and data on monitoring and recording seabed seismic activity of the self-floating seabed seismograph through a hydroacoustic pressure sensor, a MEMS accelerometer, and a seismograph sensor. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0028] Figure 1 This is a schematic diagram of the structure of the self-sinking and floating seabed seismograph provided in an embodiment of the present invention;

[0029] Figure 2 Provided for the embodiments of this utility model Figure 1 A schematic diagram of the exploded structure;

[0030] Figure 3 An exploded structural diagram of the sealing plate and mounting cylinder provided in an embodiment of this utility model;

[0031] Figure 4 Provided for the embodiments of this utility model Figure 1 A schematic diagram of the cross-sectional structure.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. First buoyancy chamber; 11. Upper side lobe chamber; 2. Second buoyancy chamber; 21. Lower side lobe chamber; 3. Clamping chamber; 4. Mounting cylinder; 41. Air inlet; 42. Limiting plate; 43. Rectangular guide rod; 44. Limiting block; 45. Sealing plate; 5. Counterweight module; 51. Threaded outer seat; 52. Filter; 53. Sodium azide ring block; 54. Ignition device; 6. GPS / satellite communication dual antenna; 7. Equidistant spring; 100. Fusion side lobe chamber; 101. Extended web. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0035] like Figure 1-4 As shown, a self-sinking and floating seabed seismograph based on MEMS accelerometer includes a cabin, which is divided into a first buoyancy cabin 1 and a second buoyancy cabin 2 distributed in sequence along the vertical direction according to its structure.

[0036] The first buoyancy chamber 1 and the second buoyancy chamber 2 intersect to form a clamping cavity 3, which is equipped with a hydroacoustic pressure sensor, a MEMS accelerometer and a seismograph sensor.

[0037] The outer wall of the second buoyancy chamber 2 is fixedly provided with mounting cylinders 4 distributed along the axis, and counterweight modules 5 are threadedly connected to the mounting cylinders 4.

[0038] Specifically, in this embodiment, the first buoyancy chamber 1 and the second buoyancy chamber 2 include a fusion sidelobe chamber 100, and the clamping cavity 3 is located within the fusion sidelobe chamber 100. The first buoyancy chamber 1 includes an upper sidelobe chamber 11, and the second buoyancy chamber 2 includes a lower sidelobe chamber 21. Furthermore, the upper sidelobe chamber 11, the lower sidelobe chamber 21, and the ports on opposite sides of the fusion sidelobe chamber 100 are all fixedly provided with extended web members 101, and are fixed together by bolts passing through the extended web members 101. A circuit board fixed with screws is placed inside the clamping cavity 3, and a PLC processor is integrated on the circuit board. The underwater acoustic pressure sensor, MEMS accelerometer, and seismograph sensor are connected to the output of the circuit board. The detection ends of the underwater acoustic pressure sensor and the seismograph sensor are located on the outside of the self-sinking and floating seabed seismograph.

[0039] Furthermore, a GPS / satellite communication dual antenna 6, distributed along the central axis, is fixedly installed on the first buoyancy chamber 1. A battery is fixedly installed on the lower side lobe chamber 21 to provide power for the operation of the entire device.

[0040] Secondly, the first buoyancy chamber 1 and the second buoyancy chamber 2 in the above embodiments are made of high-pressure resistant metal materials, including high-strength steel and composite metal materials such as titanium alloy.

[0041] It should be noted that the electronic components and electronic control programs in the above embodiments are all common technical knowledge known to those skilled in the art.

[0042] In the aforementioned technology, the outer shell of the self-floating seabed seismograph is composed of a vertically arranged first buoyancy chamber 1 and a second buoyancy chamber 2. A counterweight module 5 ensures that the center of gravity of the self-floating seabed seismograph is located perpendicular to the axis of the first buoyancy chamber 1 and the second buoyancy chamber 2. Simultaneously, water pressure data, attitude data, and data on monitoring and recording seabed seismic activity are acquired using a hydroacoustic pressure sensor, a MEMS accelerometer, and a seismograph sensor.

[0043] As a further embodiment of this utility model, combined with Figure 3 and Figure 4 As shown, the top of the mounting cylinder 4 extends into the first buoyancy chamber 1 with an open end, and the outer wall of the mounting cylinder 4 located inside the second buoyancy chamber 2 has air vents 41 arranged in a circular array.

[0044] Furthermore, a limiting plate 42 near the opening is fixedly installed inside the mounting cylinder 4, and a rectangular guide rod 43 is also included, which is slidably assembled on the limiting plate 42.

[0045] Secondly, a sealing plate 45 embedded in the opening is fixedly installed at one end of the rectangular guide rod 43, and a limit block 44 is fixedly installed at the other end.

[0046] Furthermore, an equidistant spring 7 is provided between the limiting block 44 and the limiting plate 42, which is sleeved on the rectangular guide rod 43.

[0047] Specifically, in the embodiment, with the equidistant spring 7 in its default state, the sealing plate 45 is embedded in the opening of the mounting cylinder 4. At this time, when the inflation system is running, gas fills the second buoyancy chamber 2. When the predetermined air pressure value is reached inside the second buoyancy chamber 2, the gas will pressurize and cause the sealing plate 45 to move upward, thereby opening the opening. At this time, the gas will fill the first buoyancy chamber 1. By adopting a sequential gas increase method, the self-sinking and floating seabed seismograph is guaranteed to rise at a certain speed, avoiding the rapid pressure change of the entire material due to the pressure difference between the first buoyancy chamber 1 and the second buoyancy chamber 2 as they rise rapidly.

[0048] Furthermore, in the above embodiment, the limiting plate 42 is a circular plastic plate, and the outer side of the circular plastic plate is wrapped with a soft rubber outer layer.

[0049] As another embodiment further provided by this utility model, combined with Figure 3 and Figure 4 As shown, the equidistant spring 7 has a tapered profile structure, and the tapered profile includes a narrow opening and a wide opening, with the wide opening abutting against the limiting plate 42.

[0050] Specifically, compared to cylindrical springs, the conical spring 7 in this embodiment has a diameter that gradually changes from one end to the other. This design allows the spring to utilize space more effectively in height-constrained spaces. Secondly, conical springs are more advantageous than cylindrical springs in applications requiring the bearing of greater weight or pressure. They can provide stronger load-bearing capacity while maintaining stability.

[0051] As a further embodiment of this utility model, combined with Figure 4 As shown, the counterweight module 5 includes a threaded outer seat 51 that is threadedly connected to the mounting cylinder 4, and an inflation system that can be embedded in the mounting cylinder 4 is inserted into the threaded outer seat 51.

[0052] The aforementioned inflation system includes a filter 52, a sodium azide ring block 53 disposed on the inner wall of the filter 52, and an igniter 54 extending into the sodium azide ring block 53.

[0053] Specifically, when the system needs to be inflated, the igniter 54 is activated, igniting the sodium azide ring 53. The sodium azide ring 53 decomposes rapidly during combustion, producing a large amount of nitrogen gas. After being filtered and purified by the filter 52, the nitrogen gas is inflated into the first buoyancy chamber 1 and the second buoyancy chamber 2 that require inflation.

[0054] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A self-buoyant seabed seismograph based on a MEMS accelerometer, characterized in that, It includes a cabin, which is divided into a first buoyancy cabin (1) and a second buoyancy cabin (2) distributed in sequence along the vertical direction according to its structure. The first buoyancy chamber (1) and the second buoyancy chamber (2) intersect to form a clamping cavity (3), and the clamping cavity (3) is equipped with a hydroacoustic pressure sensor, a MEMS accelerometer and a seismograph sensor; The outer wall of the second buoyancy chamber (2) is fixedly provided with an installation cylinder (4) distributed along the axis, and a counterweight module (5) is threadedly connected to the installation cylinder (4).

2. The self-buoyant seabed seismograph based on a MEMS accelerometer according to claim 1, characterized in that, The first buoyancy chamber (1) is fixedly equipped with GPS / satellite communication dual antennas (6) distributed along the central axis.

3. The self-buoyant seabed seismograph based on a MEMS accelerometer according to claim 1, characterized in that, The first buoyancy chamber (1) and the second buoyancy chamber (2) include a fusion sidelobe chamber (100), and the clamping chamber (3) is located inside the fusion sidelobe chamber (100); The first buoyancy chamber (1) includes an upper side lobe chamber (11), and the second buoyancy chamber (2) includes a lower side lobe chamber (21). The upper side lobe compartment (11), the lower side lobe compartment (21), and the fusion side lobe compartment (100) are all fixedly provided with extended web members (101) on their respective ports, and are fixed together by bolts passing through the extended web members (101).

4. A self-buoyant seabed seismograph based on a MEMS accelerometer according to claim 1, characterized in that, The mounting cylinder (4) extends to the top of the first buoyancy chamber (1) with an open top. The mounting cylinder (4) has air vents (41) arranged in a circular array on the outer wall inside the second buoyancy chamber (2).

5. A self-buoyant seabed seismograph based on a MEMS accelerometer according to claim 4, characterized in that, The mounting cylinder (4) is fixedly installed with a limiting plate (42) near the opening, and also includes a rectangular guide rod (43), which is slidably mounted on the limiting plate (42). One end of the rectangular guide rod (43) is fixedly installed with a sealing plate (45) embedded in the opening, and the other end is fixedly provided with a limit block (44). An equidistant spring (7) is provided between the limiting block (44) and the limiting plate (42) and is sleeved on the rectangular guide rod (43).

6. A self-buoyant seabed seismograph based on a MEMS accelerometer according to claim 5, characterized in that, The equidistant spring (7) has a tapered profile structure, and the tapered profile includes a narrow opening and a wide opening, the wide opening abutting against the limiting plate (42).

7. A self-buoyant seabed seismograph based on a MEMS accelerometer according to claim 1, characterized in that, The counterweight module (5) includes a threaded outer seat (51) that is threadedly connected to the mounting cylinder (4), and an inflation system that can be embedded in the mounting cylinder (4) is inserted into the threaded outer seat (51).

8. A self-buoyant seabed seismograph based on a MEMS accelerometer according to claim 7, characterized in that, The inflation system includes a filter (52), a sodium azide ring (53) disposed on the inner wall of the filter (52), and an igniter (54) extending into the sodium azide ring (53).

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