A real-time seafloor seismic node instrument device based on optical fiber transmission

Abstract

The present invention relates to a real-time seafloor seismic node instrument device based on optical fiber transmission, comprising: a seismic acquisition cabin, comprising a seismometer cabin body, an extruded O-ring and a seismometer cabin sealing cover, wherein the seismometer cabin sealing cover forms a closed space inside the seismometer cabin body by extruding the O-ring; a three-component seismometer is arranged at the bottom of the seismometer cabin body for collecting seafloor seismic data; a photoelectric conversion connector is arranged at the top of the seismometer cabin body, and the three-component seismometer is connected to the optical fiber main cable communication of the user terminal through the photoelectric conversion connector; a battery cabin is detachably connected to the seismic acquisition cabin, and is used to power the three-component seismometer. The present invention can realize high-speed data transmission by connecting the three-component seismometer and the user terminal through optical fiber, ensuring that the seismic data can be transmitted to the user terminal in real time, which is convenient for researchers to conduct long-term monitoring.

Description

Technical Field

[0001] The invention relates to the technical field of marine earthquake observation, and in particular to a real-time seafloor earthquake node instrument device based on optical fiber transmission. Background Art

[0002] With the frequent global earthquake activities and the continuous deepening of marine resource development, the demand for submarine earthquake monitoring is growing. At present, many marine earthquake scientific research, marine geological engineering, submarine oil and gas development and marine national defense security have an absolute demand for the real-time characteristics of submarine earthquake observation. For example, the monitoring of seismic activity of submarine active faults, using seafloor seismometers with real-time data transmission to conduct earthquake positioning in the fault area, source mechanism, source rupture process and seismic imaging research, can greatly improve the accuracy of research results, improve the monitoring and early warning capabilities of active faults, and provide first-hand data and judgment basis for marine engineering construction (such as nuclear power plant operation safety monitoring, marine wind farm safety and life detection, submarine pipeline operation guarantee). In the process of marine oil and gas production, it is necessary to monitor the front edge of the migration of fracturing water in real time through microseismic positioning methods to adjust the fracturing area in real time, and real-time seafloor seismic detection equipment can delineate the microseismic location in real time, providing location prior information for real-time adjustment of marine oil and gas production fracturing.

[0003] However, the traditional non-real-time floating ocean bottom seismometer (OBS) adopts a working mode of free release from the sea surface and recovery controlled by acoustic commands. It can be deployed in any area on the seabed and collect ocean bottom seismic data for several months or longer periods according to the voyage schedule of the survey ship. These observation data have non-real-time characteristics and need to be retrieved after the OBS equipment is successfully recovered. It can be seen that the traditional floating ocean bottom seismometer has obvious deficiencies in real-time performance, data acquisition and processing efficiency, and monitoring continuity. It is urgent to develop more advanced ocean bottom seismometers to overcome these shortcomings and improve the efficiency and reliability of ocean bottom earthquake monitoring. Summary of the invention

[0004] In order to solve the above problems, an object of an embodiment of the present invention is to provide a real-time seafloor seismic node instrument device based on optical fiber transmission.

[0005] A real-time seafloor seismic node instrument device based on optical fiber transmission, comprising:

[0006] The seismic acquisition cabin comprises a seismometer cabin body 18, an extruded O-ring 17 and a seismometer cabin sealing cover 16. The seismometer cabin sealing cover 16 forms a closed space inside the seismometer cabin body 18 by extruding the O-ring 17. A three-component seismometer is arranged at the bottom of the seismometer cabin body 18 for collecting seismic data on the seabed. A photoelectric conversion connector 11 is arranged at the top of the seismometer cabin body 18. The three-component seismometer is connected to the optical fiber cable of the user terminal through the photoelectric conversion connector 11.

[0007] A battery compartment is detachably connected to the seismic acquisition compartment and is used to supply power to the three-component seismometer.

[0008] Preferably, a top protective cover 8 is fixed on the seismometer cabin sealing cover 16; there are multiple accessory mounting holes on the seismometer cabin sealing cover 16, and the photoelectric conversion connector 11, the hydrophone 7, the data cable cabin penetration part 10 and the seismometer cabin air nozzle 9 are all fixed on the seismometer cabin sealing cover 16 through the accessory mounting holes.

[0009] Preferably, the battery compartment comprises: a battery compartment cover 23, a battery compartment bottom 27 and a battery compartment body 24; the battery compartment cover 23 and the battery compartment bottom 27 squeeze the sealing rings at both ends of the battery compartment body 24 to form a closed space in the battery compartment body 24; a rechargeable battery 26 is arranged in the battery compartment body 24.

[0010] Preferably, the rechargeable battery 26 is filled with an insulating filling liquid 25 to resist external pressure.

[0011] Preferably, the seismic acquisition cabin is fixed to the top surface of the battery compartment cover 23 via a bottom triangular positioning plate 14, and the buoyancy material 1 is installed around the seismic acquisition cabin.

[0012] Preferably, a battery compartment air nozzle 13 is also provided on the battery compartment.

[0013] Preferably, the battery compartment comprises at least one, and the battery compartments are detachably connected to each other via battery compartment connecting screws 15.

[0014] Preferably, it also includes:

[0015] A noise denoising module is used to denoise the collected seafloor seismic signal data to obtain denoised seafloor seismic signal data;

[0016] The noise denoising module comprises:

[0017] A signal decomposition module, used for performing wavelet transformation on the seafloor seismic signal data to obtain wavelet coefficients;

[0018] A threshold building module is used to calculate the noise reduction threshold according to the mean value of the wavelet coefficients;

[0019] A processing function construction module, used for constructing a wavelet coefficient processing function based on the noise reduction threshold;

[0020] A threshold processing module, used for performing threshold processing on the wavelet coefficients using the wavelet coefficient processing function to obtain denoised wavelet coefficients;

[0021] The denoising module is used to reconstruct the denoised wavelet coefficients to obtain denoised seafloor seismic signal data.

[0022] Preferably, in the threshold building module, the formula is adopted:

[0023]

[0024] Construct the noise reduction threshold; where T j represents the noise reduction threshold at the jth decomposition scale, k represents the preset parameter, and w i,j represents the jth wavelet coefficient at the i-th decomposition scale, μ represents the mean of the wavelet coefficient at the i-th decomposition scale, σ represents the standard deviation of the jth wavelet coefficient at the i-th decomposition scale, σ 0 = median(w i,j )0.6745, median represents the median of the wavelet coefficients at the i-th decomposition scale.

[0025] Preferably, in the threshold processing module, the wavelet coefficient processing function is:

[0026]

[0027] in, represents the wavelet coefficient after denoising, w j,k represents the kth wavelet coefficient under the jth decomposition scale, α represents the first adjustable coefficient, and β represents the second adjustable coefficient.

[0028] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0029] The present invention relates to a real-time seafloor seismic node instrument device based on optical fiber transmission. Compared with the prior art, the present invention connects a three-component seismometer and a user terminal through optical fiber to achieve high-speed data transmission, ensuring that seismic data can be transmitted to the user terminal in real time, making it convenient for researchers to conduct long-term monitoring.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1A schematic diagram of the overall structure of a real-time seafloor seismic node instrument device based on optical fiber transmission provided by the present invention;

[0033] Figure 2 This is a schematic diagram of the overall appearance of a combined high-sensitivity seabed monitoring device provided by the present invention;

[0034] Figure 3 An overall schematic diagram of a real-time seafloor seismic node instrument device based on optical fiber transmission provided by the present invention after the buoyancy material is removed;

[0035] Figure 4 A schematic cross-sectional view of a seismometer cabin of a real-time seafloor seismic node instrument device based on optical fiber transmission provided by the present invention;

[0036] Figure 5 A schematic cross-sectional view of a battery compartment of a real-time seafloor seismic node instrument device based on optical fiber transmission provided by the present invention.

[0037] Explanation of symbols:

[0038] Buoyancy material 1, lifting ring 2, battery compartment No. 1 3, power supply penetration 4, battery compartment No. 2 5, pull ring 6, hydrophone 7, top protective cover 8, seismometer compartment air nozzle 9, data cable compartment penetration 10, photoelectric conversion connector 11, cabin fixing screws 12, battery compartment air nozzle 13, triangular positioning plate 14, battery compartment connecting screws 15, seismometer compartment sealing cover 16, O-ring 17, seismometer cabin 18, acquisition circuit board 19, photoelectric conversion module 20, detector 21, rechargeable battery 22, battery compartment upper cover 23, battery compartment 24, insulating filling liquid 25, rechargeable battery 26, battery compartment bottom 27. DETAILED DESCRIPTION

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The structural design of the submarine seismic node instrument device of the present invention adopts a dual independent structure of an independent seismic acquisition cabin and an independent battery cabin, and the two independent cabins are hard-linked by screws; the entire device optimizes the configuration of quantitative floating materials to provide partial buoyancy to ensure that the weight of the instrument in water is controllable when it is put into recovery; the independent seismic acquisition cabin contains a seismometer core and an acquisition circuit, and the seismometer is a three-component high-sensitivity mechanical seismometer. The independent battery cabin is fixedly connected under the seismic acquisition cabin. The number of independent battery cabins can be determined according to the observation time of the sea. A single battery cabin is designed according to the battery capacity of a single month. If long-term multi-month observation is required, multiple battery cabins can be stacked and synchronously connected; the independent seismometer cabin reserves an optical fiber interface, and the plug-in design can be quickly integrated into an external optical fiber cable for real-time data transmission. The independent seismic acquisition cabin has the characteristics of small size, light weight, and multiple uses. A conical floating material is matched on the periphery. The overall buoyancy of the instrument is freely selected according to the weight of the matching battery cabin and the volume and shape of the floating material to ensure that the underwater weight is not more than 5 kilograms. The seismic acquisition cabin is made of a whole piece of titanium alloy material, which has the characteristics of light weight, high strength, and strong corrosion resistance. The independent battery compartment is made of 316 stainless steel and is filled with insulating liquid. It has the advantages of light weight and high energy. When the instrument needs to be recovered, it is dragged to the sea surface with the cable to complete the recovery.

[0043] See also Figure 1-5 , a real-time seafloor seismic node instrument device based on optical fiber transmission, comprising:

[0044] The seismic acquisition cabin comprises a seismometer cabin body 18, an extruded O-ring 17 and a seismometer cabin sealing cover 16, wherein the seismometer cabin sealing cover 16 forms a closed space inside the seismometer cabin body 18 by extruding the O-ring 17; a three-component seismometer is arranged at the bottom of the seismometer cabin body 18 for collecting seismic data on the seabed; a photoelectric conversion connector 11 is arranged at the top of the seismometer cabin body 18, and the three-component seismometer is connected to the optical fiber main cable of the user terminal through the photoelectric conversion connector 11; a small number of rechargeable batteries 22 for temporary testing are arranged around the three-component seismometer (three-component geophone 21), and a photoelectric conversion module 20 and an acquisition circuit board 19 are fixed on the geophone 21.

[0045] A battery compartment is detachably connected to the seismic acquisition compartment and is used to supply power to the three-component seismometer.

[0046] The battery compartment includes at least one, and each battery compartment is detachably connected by a battery compartment connecting screw 15. The battery compartment can be assembled in a selected number according to actual exploration needs. The seismic acquisition compartment is fixed to the top surface of the battery compartment cover 23 by a bottom triangular positioning plate 14, and the buoyancy material 1 is installed around the seismic acquisition compartment.

[0047] Furthermore, a top protective cover 8 is fixed on the seismometer cabin sealing cover 16; there are multiple accessory mounting holes on the seismometer cabin sealing cover 16, and the photoelectric conversion connector 11, the hydrophone 7, the data cable cabin penetration part 10 and the seismometer cabin air nozzle 9 are all fixed on the seismometer cabin sealing cover 16 through the accessory mounting holes.

[0048] The battery compartment includes: a battery compartment upper cover 23, a battery compartment bottom 27 and a battery compartment body 24; the battery compartment upper cover 23 and the battery compartment bottom 27 squeeze the sealing rings at both ends of the battery compartment body 24 to form a closed space in the battery compartment body 24; a rechargeable battery 26 is arranged in the battery compartment body 24. The rechargeable battery 26 is filled with an insulating filling liquid 25 around it to resist external pressure. A battery compartment air nozzle 13 is also arranged on the battery compartment.

[0049] In an embodiment of the present invention, a single real-time seismic node is connected to the optical fiber main cable through an optical fiber connector at the branch cable of the optical fiber overview, and the other end of the optical fiber main cable is a shore-based user terminal. A single real-time seafloor seismic node equipment based on optical fiber transmission, the external structure includes a pressure-resistant seismic acquisition cabin, upper and lower flanges. The use process of the device is: after debugging a single independent real-time seismic node, connect the external reserved optical fiber connector to the optical fiber main cable, remotely control the seismic node to enter the working state at the shore-based user terminal, debug the cabin pressure of the seismic node, and whether the seismic data acquisition is normal. After ensuring that the seismic node is normal, use a ship to drop it to a pre-selected position on the seabed to realize real-time seismic data acquisition and transmission at the node, and the shore-based user terminal saves the seismic data in real time.

[0050] To ensure the high-sensitivity seismic data acquisition requirements, all cabins of the device meet the technical design of strong coupling and weak noise interference of the whole machine. The cabin processing adopts the rolling and forming process after forging and punching. The heating forging process can significantly improve the cabin's organizational structure and mechanical properties. The material cost, energy consumption and comprehensive cost are low, which ensures the economy of cabin mass production and ensures the batch engineering of real-time seismic node devices in the later stage. There are installation holes for accessories with different functions on the top of the cabin, which are used to install hydrophones, sealing connectors, observation holes, etc. All installation holes meet the pressure resistance strength of 1,000 meters water depth.

[0051] The upper flange is designed with a fan-shaped structure, which realizes its protective functions such as docking plug-ins and hydrophones, and is convenient for connecting with other structures. The flange reserves extra space and high-strength materials to ensure the transportation of the entire device. This structural design does not affect the uniform layout of the entire device, and ensures the convenience of offshore deployment and recovery operations.

[0052] The independent battery cabin is fixedly connected to the seismic acquisition cabin through the threaded holes of the lower flange. The seismic acquisition cabin integrates a digital collector, an omnidirectional high-sensitivity detector, a network communication module, a GPS positioning module, and an electronic compass. The three-component seismometer adopts an omnidirectional detector and a self-developed spread spectrum circuit board. This design ensures that the frequency response curve is flat, the sensitivity is high and stable within a wider frequency band.

[0053] The electronic circuit and software architecture adopts a relatively mature data acquisition solution for floating and sinking seafloor seismographs. The software and hardware solution is to transplant the original mature seafloor seismic acquisition system based on the ARM7 core microcontroller to the Cortex-M3 core microcontroller system with higher performance and lower power consumption. At the same time, the real-time data transmission module is upgraded, and the data is first sent to the photoelectric conversion module using the network protocol, and then converted into an optical signal and transmitted over long distances through optical fiber. This electronic circuit and software architecture solution fully inherits the OBS that was successfully developed and applied in batches in the early stage, shortening the development cycle, reducing development risks, and saving development costs. At the same time, it upgrades the performance of the whole machine and ensures the technological advancement of the real-time seismic node device.

[0054] It should be noted that the use process of the seafloor seismic node instrument device of the present invention is as follows:

[0055] Connect the external reserved optical fiber connector of a single independent real-time seismic node to the optical fiber main cable, remotely control the seismic node to enter the working state at the shore-based user terminal, debug the cabin pressure and seismic data collection of the seismic node to see if it is normal, and perform instrument maintenance if abnormal. If the state is normal, connect the single real-time seismic node device to the optical fiber main cable with Kevlar rope, etc., and use Kevlar rope to drop the seismic node on the ship to a pre-selected position on the seabed to achieve real-time seismic data collection and transmission at the node, and the shore-based user terminal saves the seismic data in real time. After the data collection is completed, the entire optical fiber main cable is recovered. Because the single real-time seismic node is light in the water due to the installation of buoyancy materials, the seismic node can be directly dragged to the sea surface by recovering the optical fiber main cable. After reaching the sea surface, the Kevlar rope on the seismic node is used to recover the single real-time seismic node to the deck.

[0056] Since the seafloor seismic signals are collected on the seafloor, they are affected by environmental factors, which makes the original signals contain more noise. The sources of these noises are complex, mainly including natural noise and biological noise, such as the beating of waves, tidal changes, and marine biological activities (such as whale calls, fish movement, etc.). These noises have a wide frequency range and are likely to overlap with seismic signals, interfering with the identification of seismic signals.

[0057] Therefore, the present invention adopts a noise denoising module to denoise the collected seabed seismic signal data to obtain denoised seabed seismic signal data;

[0058] Furthermore, the noise denoising module includes:

[0059] A signal decomposition module, used for performing wavelet transformation on the seafloor seismic signal data to obtain wavelet coefficients;

[0060] A threshold building module is used to calculate the noise reduction threshold according to the mean value of the wavelet coefficients;

[0061] In the threshold building block, the formula is used:

[0062]

[0063] Construct the noise reduction threshold; where T j represents the noise reduction threshold at the jth decomposition scale, k represents the preset parameter, and w i,j represents the jth wavelet coefficient at the i-th decomposition scale, μ represents the mean of the wavelet coefficient at the i-th decomposition scale, σ represents the standard deviation of the jth wavelet coefficient at the i-th decomposition scale, σ 0 = median(w i,j )0.6745, median represents the median of the wavelet coefficients at the i-th decomposition scale.

[0064] The present invention constructs a noise reduction threshold that varies with the wavelet decomposition scale based on the mean and standard deviation of wavelet coefficients at different decomposition scales, and can adaptively transform the wavelet coefficients at each scale, highlight the detailed features of different scales, and suppress various types of noise in seismic monitoring signals.

[0065] A processing function construction module is used to construct a wavelet coefficient processing function based on the noise reduction threshold; wherein the wavelet coefficient processing function is:

[0066]

[0067] in, represents the wavelet coefficient after denoising, w j,k represents the kth wavelet coefficient under the jth decomposition scale, α represents the first adjustable coefficient, and β represents the second adjustable coefficient.

[0068] Traditional threshold functions include hard threshold function and soft threshold function. Traditional hard and soft threshold functions can be used to remove noise to a certain extent, but they have shortcomings. The hard threshold function can maintain the local information of the original signal, but a jump occurs at the threshold T, causing the reconstructed signal to oscillate and the pseudo-Gibbs phenomenon to occur; the soft threshold function overcomes the discontinuity problem of the hard threshold function. The signal after denoising by the soft threshold function will be relatively smooth, but there is a constant deviation between the wavelet coefficients estimated by the soft threshold function, resulting in partial missing of the reconstructed signal.

[0069] The wavelet coefficient processing function of the present invention is between the soft and hard threshold functions, and can be switched by adjusting α and β, which increases the flexibility of using the threshold function. The denoising function is an odd function that is continuous on (-∞, +∞) and when |w j,k |→∞, it approaches the soft threshold function. j,k |>T, due to Therefore, when the wavelet coefficients are large, the constant deviation problem of the soft threshold function can be effectively improved, making the reconstructed seismic signal closer to the actual value.

[0070] In practical applications, the present invention can evaluate the signal-to-noise ratio of the denoised seismic signal. When the signal-to-noise ratio is not within a preset range, α and β are readjusted until the signal-to-noise ratio of the seismic signal falls within a target range.

[0071] A threshold processing module, used for performing threshold processing on the wavelet coefficients using the wavelet coefficient processing function to obtain denoised wavelet coefficients;

[0072] The denoising module is used to reconstruct the denoised wavelet coefficients to obtain denoised seafloor seismic signal data.

[0073] The present invention can achieve high-speed data transmission by connecting the three-component seismometer and the user terminal through optical fiber, ensuring that the seismic data can be transmitted to the user terminal in real time, and at the same time, denoising the seismic signal can improve the quality of the data, making it convenient for researchers to conduct long-term monitoring.

[0074] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technical solution that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A real-time seafloor seismic node instrument device based on optical fiber transmission, characterized in that: include: A seismic acquisition cabin comprises a seismometer cabin body (18), an extruded O-ring (17) and a seismometer cabin sealing cover (16), wherein the seismometer cabin sealing cover (16) forms a closed space inside the seismometer cabin body (18) by extruding the O-ring (17); a three-component seismometer is arranged at the bottom of the seismometer cabin body (18) for collecting seismic signal data on the seabed; a photoelectric conversion connector (11) is arranged at the top of the seismometer cabin body (18), and the three-component seismometer is connected to the optical fiber cable of the user terminal through the photoelectric conversion connector (11); A battery compartment, detachably connected to the seismic acquisition compartment, for supplying power to the three-component seismometer; Also includes: A noise denoising module is used to denoise the collected seafloor seismic signal data to obtain denoised seafloor seismic signal data; The noise denoising module comprises: A signal decomposition module, used for performing wavelet transformation on the seafloor seismic signal data to obtain wavelet coefficients; A threshold building module is used to calculate the noise reduction threshold according to the mean value of the wavelet coefficients; In the threshold building block, the formula is used: Construct the noise reduction threshold; where T j represents the noise reduction threshold at the jth decomposition scale, k represents the preset parameter, and w i,j represents the jth wavelet coefficient at the i-th decomposition scale, μ represents the mean of the wavelet coefficient at the i-th decomposition scale, σ represents the standard deviation of the jth wavelet coefficient at the i-th decomposition scale, σ0=median(|w i,j |)0.6745, median represents the median of the wavelet coefficients at the i-th decomposition scale; A processing function construction module, used for constructing a wavelet coefficient processing function based on the noise reduction threshold; A threshold processing module, used for performing threshold processing on the wavelet coefficients using the wavelet coefficient processing function to obtain denoised wavelet coefficients; In the threshold processing module, the wavelet coefficient processing function is: in, represents the wavelet coefficient after denoising, w j,k represents the kth wavelet coefficient under the jth decomposition scale, α and β represent adjustable coefficients; The denoising module is used to reconstruct the denoised wavelet coefficients to obtain denoised seafloor seismic signal data.

2. A real-time seafloor seismic node instrument device based on optical fiber transmission according to claim 1, characterized in that: A top protective cover (8) is fixed on the seismometer cabin sealing cover (16); a plurality of accessory mounting holes are provided on the seismometer cabin sealing cover (16); a photoelectric conversion connector (11), a hydrophone (7), a data cable cabin penetration component (10) and a seismometer cabin air nozzle (9) are all fixed on the seismometer cabin sealing cover (16) through the accessory mounting holes.

3. A real-time seafloor seismic node instrument device based on optical fiber transmission according to claim 2, characterized in that: The battery compartment comprises: a battery compartment upper cover (23), a battery compartment bottom (27) and a battery compartment body (24); the battery compartment upper cover (23) and the battery compartment bottom (27) squeeze the sealing rings at both ends of the battery compartment body (24) to form a closed space for the battery compartment body (24); a rechargeable battery (26) is arranged in the battery compartment body (24).

4. A real-time seafloor seismic node instrument device based on optical fiber transmission according to claim 3, characterized in that: The rechargeable battery (26) is filled with an insulating filling liquid (25) to resist external pressure.

5. A real-time seafloor seismic node instrument device based on optical fiber transmission according to claim 4, characterized in that: The seismic acquisition cabin is fixed to the top surface of the battery cabin upper cover (23) via a bottom triangular positioning plate (14), and the periphery of the seismic acquisition cabin is used to install buoyancy materials (1).

6. A real-time seafloor seismic node instrument device based on optical fiber transmission according to claim 5, characterized in that: The battery compartment is also provided with a battery compartment air nozzle (13).

7. The real-time seafloor seismic node instrument device based on optical fiber transmission according to claim 1, characterized in that: The battery compartment comprises at least one battery compartment, and the battery compartments are detachably connected to each other via battery compartment connecting screws (15).

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