Seismic geophone

Abstract

The embodiment of the invention relates to seismic detection, and discloses a geophone, which comprises a coil module group, which comprises a main coil and a compensation coil which are wound in a reverse direction; the shielding module is of a hollow structure and is arranged on the outer side of the coil module in a sleeving manner for electromagnetic shielding; the magnetic fluid module is located in the coil module and is coaxially arranged with the coil module; wherein the coil module covers a part of the magnetofluid module, the shielding module covers a part of the coil module, and the shielding module covers the whole area of the magnetofluid module. A magnetofluid suspension and double-coil differential system is formed by the coil module and the magnetofluid module, through structural design optimization, the signal acquisition fidelity of the detector in a complex urban environment is improved, and the requirements of a buried power box culvert and other nondestructive detection scenes for high-precision signals are met.

Description

Technical Field

[0001] This application relates to the field of earthquake detection technology, and in particular to a seismic detector. Background Technology

[0002] In the field of geophysical exploration, especially in the non-destructive testing of buried power culverts, the micro-motion method is widely used because it does not require damaging the earth's surface. However, two major sources of interference exist in urban environments, severely impacting the signal acquisition accuracy of seismic detectors:

[0003] Mechanical vibration interference: Multi-directional ground vibrations caused by traffic, construction, etc., especially lateral impacts, can cause frictional nonlinearity in the suspension system (such as leaf springs) of traditional detectors, which in turn causes amplitude distortion, phase shift and low-frequency signal distortion. This results in ultra-micro vibration signals (such as tidal forces and wind disturbances) being submerged by frictional noise, with the measured bandwidth being lower than the theoretical value. Furthermore, the detector has weak lateral impact resistance and is prone to sensor resonance caused by vehicle traffic, generating false abnormal signals.

[0004] Strong electromagnetic interference (EMI): Areas with dense power facilities have 50Hz power frequency and its harmonics, frequency conversion noise, etc. The single-coil structure of traditional moving-coil detectors is easily coupled by magnetic fields, which leads to signal baseline drift and a sharp drop in signal-to-noise ratio. Moreover, the single-coil pickup structure cannot actively cancel the environmental magnetic field interference and needs to rely on external shielding (increasing volume / weight). It has poor suppression effect on high-frequency interference (>1kHz). In strong EMI environment, the dynamic range of the equipment is narrowed and the data is prone to saturation and distortion.

[0005] However, the inventors have discovered at least the following technical problems in the related technologies: how to improve the signal acquisition fidelity of the detector in complex urban environments through structural design optimization, so as to meet the demand for high-precision signals in non-destructive testing scenarios such as buried power culverts. Summary of the Invention

[0006] One object of this application is to provide a seismic detector that at least solves the above-mentioned problems.

[0007] To achieve the above objectives, some embodiments of this application provide a seismic detector, including: a coil module comprising a main coil wound in reverse and a compensation coil;

[0008] The shielding module is a hollow structure that is fitted onto the outside of the coil module for electromagnetic shielding.

[0009] The magnetofluid module is located within the coil module and is coaxially arranged with the coil module;

[0010] The coil module covers part of the magnetofluid module, the shielding module covers part of the coil module, and the shielding module covers the entire area of ​​the magnetofluid module.

[0011] Compared with related technologies, the solution provided in this application uses a main coil and a compensation coil wound in opposite directions in the coil module. Utilizing the principle of electromagnetic induction superposition, it can actively cancel electromagnetic interference such as power frequency and harmonics in the external environment, reducing the impact of electromagnetic interference on seismic signal acquisition. The shielding module is sleeved on the outside of the coil module, which can passively shield the coil module and further block external electromagnetic interference. Combined with the active cancellation effect of the coil module, it enhances the overall anti-electromagnetic interference capability. The magnetohydrodynamic module is located in the coil module and is coaxially arranged. By utilizing the characteristics of magnetohydrodynamics, it eliminates the friction of traditional suspension systems, reduces signal distortion and phase shift caused by friction, and improves the fidelity of seismic signal acquisition. At the same time, the adaptive damping characteristics of magnetohydrodynamics can enhance the detector's resistance to multi-directional impacts and reduce the impact of external vibration interference. Through structural design optimization, the signal acquisition fidelity of the detector in complex urban environments is improved, meeting the high-precision signal requirements of non-destructive testing scenarios such as buried power culverts.

[0012] The "magnetic fluid suspension and dual-coil differential" system, formed by coil modules and magnetofluid modules, reduces friction compared to traditional suspension methods. The use of titanium alloy flexible hinges reduces contact area by 90%, and the magnetofluid medium itself eliminates residual friction, keeping amplitude distortion below 0.5%. Simultaneously, the reverse windings of the dual-coil differential system cancel out external magnetic fields during differential amplification. Combined with N52 magnet shielding, the expected electromagnetic interference suppression ratio can reach over 60dB. This system strongly suppresses electromagnetic and noise interference from the construction environment, improving the accuracy and quality of micro-motion detection. By reducing noise by three orders of magnitude and distortion by 80%, it addresses the ultimate problem of "millimeter-level box culvert positioning in complex urban environments." Furthermore, its impressive environmental adaptability data—IP68 and a temperature range of -20 to 60℃—directly solves the extreme environmental problems mentioned by 99% of users, such as coastal operations. Attached Figure Description

[0013] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0014] Figure 1 This is a cross-sectional schematic diagram of the seismic detector provided in an embodiment of this disclosure;

[0015] Figure 2 This is a partial structural schematic diagram of the seismic detector provided in an embodiment of this disclosure;

[0016] Figure 3 This is a partial explosion diagram of the seismic detector provided in the embodiments of this disclosure;

[0017] Figure 4 This is a schematic diagram of the structure of the seismic detector provided in the embodiments of this disclosure;

[0018] Figure 5 This is a structural schematic diagram of the seismic detector provided in an embodiment of this disclosure from another perspective.

[0019] Figure label:

[0020] 10: Coil module; 101: Coil frame; 20: Shielding module; 30: Magnetofluid module; 301: Flexible hinge; 40: Outer shell; 401: Cylindrical shell; 402: Hemispherical shell; 50: Acquisition module; 60: Positioning module; 70: Antenna module; 80: Battery module; 90: Main control board; 100: Top cover; 1001: Handle; 110: Base assembly. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0023] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0024] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0025] Unless otherwise stated, the term "multiple" means two or more.

[0026] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0027] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0029] Combination Figures 1 to 5 As shown in the figure, an embodiment of the present disclosure provides a seismic detector, including: a coil module 10, a shielding module 20 and a magnetohydrodynamic module 30.

[0030] The coil module 10 includes a main coil wound in reverse and a compensation coil; the shielding module 20 is a hollow structure and is sleeved on the outside of the coil module 10 for electromagnetic shielding; the magnetofluid module 30 is located in the coil module 10 and is coaxially arranged with the coil module 10; wherein, the coil module covers part of the magnetofluid module 30, the shielding module 20 covers part of the coil module 10, and the shielding module 20 covers the entire area of ​​the magnetofluid module 30.

[0031] The seismic detector provided in this embodiment employs a coil module 10 with a main coil and a compensation coil wound in opposite directions. Utilizing the principle of electromagnetic induction superposition, it can actively cancel electromagnetic interference such as power frequency and harmonics in the external environment, reducing the impact of electromagnetic interference on seismic signal acquisition. The shielding module 20 is sleeved on the outside of the coil module 10, providing passive shielding and further blocking external electromagnetic interference. Combined with the active cancellation effect of the coil module 10, it enhances the overall anti-electromagnetic interference capability. The magnetohydrodynamic module 30 is located within the coil module 10 and coaxially arranged. By utilizing the properties of magnetohydrodynamics, it eliminates friction in traditional suspension systems, reducing signal distortion and phase shift caused by friction, thus improving the fidelity of seismic signal acquisition. Simultaneously, the adaptive damping characteristics of magnetohydrodynamics enhance the detector's resistance to multi-directional impacts and reduce the impact of external vibration interference.

[0032] This embodiment utilizes a "magnetic fluid suspension and dual-coil differential" system formed by coil module 10 and magnetofluid module 30. The suspension method of magnetofluid module 30 reduces friction compared to traditional suspension systems. The use of titanium alloy flexible hinge 301 reduces the contact surface by 90%, and the magnetofluid medium itself eliminates residual friction, allowing amplitude distortion to be controlled below 0.5%. Simultaneously, the reverse winding of the dual-coil differential system cancels out the external magnetic field during differential amplification. Combined with N52 magnet shielding, the expected electromagnetic interference suppression ratio can reach over 60dB. This system strongly suppresses electromagnetic and noise interference from the construction environment, improving the accuracy and quality of micro-motion detection. By reducing noise by three orders of magnitude and distortion by 80%, it addresses the problem of "millimeter-level box culvert positioning in complex urban environments." Furthermore, environmental adaptability data such as IP68 and a temperature range of -20 to 60℃ directly solves the extreme and harsh environmental problems mentioned by 99% of users, such as coastal operations.

[0033] Optionally, the coil module 10 adopts a compact design with 0.1mm diameter copper wire and 2000 turns, which can reduce the distributed capacitance of the coil, ensure the flat response of the detector in a wider frequency band (such as 0.1-1000Hz), avoid the problem of high frequency signal attenuation, and improve the acquisition quality of the detector for seismic signals of different frequencies.

[0034] For example, a main coil and a compensation coil are wound with 2000 turns of copper wire with a diameter of 0.1 mm. The main coil and the compensation coil are wound in opposite directions on a coil frame 101 made of engineering plastic to form a coil module 10 with a diameter of 12 mm and a height of 15 mm.

[0035] The main coil and compensation coil are wound in reverse (2000 turns of 0.1mm copper wire), achieving a common-mode rejection ratio (CMRR) of ≥60dB against power frequency / harmonic interference through electromagnetic induction and reverse superposition. Combined with an external shielding layer of N52 neodymium iron boron magnets, this forms a dual protection system of "active cancellation + passive shielding," ensuring baseline stability even under a strong electric field of 500kV / m. The compact coil design reduces distributed capacitance, guaranteeing a flat response across the entire 0.1-1000Hz frequency band and avoiding the high-frequency signal attenuation problems found in existing equipment.

[0036] Optionally, the shielding module 20 has a hollow cylindrical structure and is coaxially arranged with the coil module 10. This ensures that the shielding module 20 provides uniform and symmetrical shielding to the coil module 10, blocking electromagnetic interference from all directions to the greatest extent. Simultaneously, the coaxial arrangement helps ensure the stability of the magnetic circuit and reduces interference from magnetic field disturbances caused by structural asymmetry on the signal acquisition of the coil module 10.

[0037] Optionally, the shielding module 20 is made of magnet steel. Magnet steel itself has strong magnetic field shielding capabilities, effectively enhancing the shielding effect against external electromagnetic interference, further improving the detector's anti-interference performance in strong electromagnetic environments, and ensuring stable acquisition of seismic signals. Preferably, the shielding module 20 uses neodymium iron boron (N52) magnet steel. A hollow columnar structure (28mm in diameter) made of N52 magnet steel is fitted onto the outside of the coil module 10, coaxially arranged with the coil module 10. The distance between its inner wall and the outer wall of the coil module 10 can be maintained at 2mm, forming a uniform shielding space.

[0038] Optionally, the magnetofluid module 30 is suspended in the coil module 10 and is connected to the coil module 10 and / or the shielding module 20.

[0039] The magnetofluid module 30 is suspended and connected to the coil module 10 and / or the shielding module 20. The suspension reduces the contact between the magnetofluid module 30 and other components, reducing friction. At the same time, this connection method can better transmit seismic vibration signals by utilizing the characteristics of magnetofluid, ensuring the sensitivity and accuracy of signal acquisition, and helping to improve the detector's response speed to vibration.

[0040] For example, the magnetofluid module 30 consists of a magnetofluid medium and a titanium alloy flexible hinge 301 (titanium alloy micro-spring sheet). The magnetofluid medium is located in the cavity at the center of the coil module 10. The titanium alloy micro-spring sheet (nonlinear stiffness design) connects the magnetofluid module 30 to the inner wall of the coil module 10 (coil frame 101), so that the magnetofluid module 30 is suspended and coaxial with the coil module 10. The suspended state of the magnetofluid module 30 can reduce the natural frequency of the detector, increase the bandwidth, reduce the contact surface, further eliminate friction, improve the ability to collect ultra-low frequency vibration signals, and enhance the detector's response range to seismic signals of different frequencies.

[0041] The Magnetofluidic Module 30 replaces mechanical bearings, eliminating contact friction between moving parts and resolving amplitude distortion (<0.5% nonlinear distortion) and phase lag issues caused by traditional spring plates. Combined with the titanium alloy flexible hinge 301 and nonlinear stiffness design, the natural frequency is extended to an adjustable range of 3-8Hz (superior to the traditional 5 / 10Hz fixed main frequency), achieving high-fidelity capture of ultra-low frequency signals (such as 0.1Hz tidal disturbances). Furthermore, the adaptive damping characteristics of the Magnetofluidic Module 30 suppress lateral vibration transmission, improving lateral shock resistance by 300% and preventing signal distortion caused by urban traffic. The neodymium iron boron + pole shoe magnet optimization of the magnetic circuit ensures levitation stability while reducing costs by 50%, making it industrially feasible.

[0042] Optionally, it also includes: a housing 40, comprising an integral cylindrical shell 401 and a hemispherical shell 402, wherein the hemispherical shell 402 is located on top of the cylindrical shell 401; wherein the shielding module 20 is located inside the cylindrical shell 401 and is fixedly connected to the cylindrical shell 401.

[0043] This structural design helps to reduce the seams of the outer shell 40, improve the sealing performance of the outer shell 40, and better protect the internal components from the influence of the external environment (such as moisture, dust, etc.). At the same time, the shielding module 20 is located inside the cylindrical shell 401 and is fixedly connected to the cylindrical shell 401, which can ensure the positional stability of the shielding module 20 during the operation of the detector and ensure the reliability of its shielding effect.

[0044] For example, the outer peripheral surface of the shielding module 20 (neodymium iron boron N52 magnet hollow column) is fixedly connected to the inner ring surface of the cylindrical shell 401. The two can be coaxially fixed by a stainless steel fixing bracket. The bottom of the shielding module 20 is at least 5 mm away from the bottom inner wall of the cylindrical shell 401, and the top is at least 10 mm away from the bottom of the hemispherical shell 402.

[0045] Optionally, the outer peripheral surface of the shielding module 20 abuts against the inner annular surface of the cylindrical shell 401 and is coaxially arranged.

[0046] In this way, on the one hand, the connection between the shielding module 20 and the shell 401 can be made stable, and the shielding effect can be avoided due to the shaking of the shielding module 20 in the vibration environment; on the other hand, the coaxial arrangement can ensure the uniformity of shielding of the coil module 10 by the shielding module 20, further optimize the anti-electromagnetic interference effect, and this structure is also conducive to the rational use of the internal space of the detector.

[0047] Optionally, the outer surface of the housing 40 adopts a sealing structure of a self-healing silicone sealing system, in which the silicone is doped with microcapsule repair agent, which can release polymer when it breaks, achieving an IP68 waterproof rating, effectively resisting the effects of harsh environments such as high humidity and salt spray, and ensuring the long-term reliable operation of the detector in extreme environments such as coastal areas.

[0048] Optionally, the housing 40 is made of ABS plastic with a thickness of 2.5mm and a frosted paint process. While ensuring that the housing 40 has a certain strength to protect the internal components, it reduces the overall weight of the detector, making it easier to carry and place, and improving the ease of use of the detector.

[0049] Optionally, it also includes: a data acquisition module 50, which is disposed inside the housing 40 and located above the coil module 10, and is electrically connected to the coil module 10.

[0050] This built-in and close-range connection reduces the signal transmission distance between the acquisition module 50 and the coil module 10, reduces signal loss and interference during transmission, and improves the efficiency and quality of signal acquisition. At the same time, the integrated structural design facilitates the overall layout and use of the detector.

[0051] For example, the acquisition module 50 includes an ADC acquisition board assembly with 36-bit resolution and a sampling rate of 1kHz, located at the junction of the hemispherical shell 402 and the cylindrical shell 401 of the outer casing 40, and electrically connected to the coil module 10 through wires, with the wire length controlled within 5cm to reduce signal loss.

[0052] Optionally, the system further includes: a positioning module 60, housed within the housing 40 and located above the coil module 10, electrically connected to the coil module 10; and an antenna module 70, housed within the housing 40 and located above the coil module 10, electrically connected to the coil module 10. The positioning module 60 and the antenna module 70 work together to ensure the positioning accuracy of the seismic detector. This built-in design protects these modules from external environmental interference, ensuring their operational stability.

[0053] The positioning module 60 works in conjunction with the antenna module 70 to improve the positioning accuracy of the detector, ensuring that the position information of each device is accurate during the seismic data acquisition process. This ensures that each device does not experience significant zero-point drift when acquiring seismic data during normal operation, guaranteeing the authenticity and complete correspondence of the acquired data. This is beneficial for subsequent analysis and processing of seismic data and improves the reliability of the detection results.

[0054] For example, the positioning module 60 adopts a Beidou / GPS dual-mode module, and the antenna module 70 is a GPS antenna with a diameter of 8mm and a height of 5mm. Both are located above or to the side of the acquisition module 50. When located above, they can be connected via a coaxial cable. The antenna module 70 faces the top of the hemispherical shell 402 to enhance signal reception capability.

[0055] Optionally, it also includes a battery module 80, which is disposed inside the housing 40 and located below the shielding module 20, and is electrically connected to the coil module 10.

[0056] The built-in design protects the battery module 80 from external environmental influences, extending its service life. At the same time, the electrical connection with the coil module 10 provides a stable power supply to the coil module 10, ensuring the continuous operation of the detector. This layout also facilitates the rational planning of the detector's internal structure, making the overall structure more compact.

[0057] For example, the battery module 80 uses a 3.7V, 2000mAh lithium battery, which is located at the bottom of the cylindrical shell 401 below the shielding module 20. It is powered by wires to the coil module 10, the acquisition module 50 and the positioning module 60 respectively, and the wires are covered with an electromagnetic shielding layer.

[0058] Optionally, the housing 40 includes an intelligent battery management module. This module performs temperature control to prevent aging or malfunction of internal mechanical components caused by changes in internal operating temperature, ensuring the operational stability of the battery module 80 and other components, and extending the lifespan of the detector. The inner wall of the housing 40 is covered with a high-temperature superconducting thin film, which, in conjunction with the temperature control script of the intelligent battery management module, stabilizes the internal operating temperature between -20℃ and 60℃.

[0059] Optionally, it also includes: a top cover 100, disposed on the top of the housing 40 and detachably connected to the housing 40; wherein the top cover 100 is connected to the housing 40 and has a communication interface internally configured to allow manual downloading internally in case of failure.

[0060] The top cover 100 is located on the top of the outer casing 40 and is detachably connected, which facilitates the maintenance, disassembly and charging of the internal components of the detector. The top cover 100 is connected to the outer casing 40 and has a communication interface inside. In case of equipment failure, internal manual download can be performed, avoiding the problems of traditional exposed interfaces being easily damaged and water entering, improving the safety and reliability of the interface, and ensuring the stability of data transmission.

[0061] Optionally, the top cover 100 is made of ABS engineering plastic and is detachably connected to the outer shell 40 hemispherical shell 402 via a sealed embedded thread, with a self-healing silicone sealing ring (doped with microcapsule repair agent) at the connection.

[0062] For example, the top cover 100 has an internal structure for RS485 and Ethernet communication interfaces, and the communication interfaces are covered with a soft rubber protective layer.

[0063] Optionally, it also includes: a light source structure, located on the upper cover 100, to indicate the working status via indicator lights.

[0064] The light source structure is located on the upper cover 100, and the working status is indicated by the indicator light. The operator can intuitively understand the working status of the detector (such as normal operation, fault, standby, etc.), which facilitates timely detection and handling of abnormal conditions of the detector and improves the ease of use of the detector.

[0065] For example, the light source structure includes an outer working status indicator light (red, green, and yellow) and an inner non-removable built-in power button (protected by soft rubber).

[0066] Optionally, the top of the cover 100 is provided with a handle 1001 for moving the seismic detector.

[0067] The top of the cover 100 is equipped with a handle 1001, which facilitates the operator in moving the seismic detector. The design of the handle 1001 also avoids the situation where a rope on the handle 1001, as is common on traditional equipment, can cause false signals due to wind blowing through the rope, thus ensuring the authenticity of the seismic data acquisition. For example, the top of the cover 100 is provided with a nylon-reinforced plastic handle 1001 (10mm in diameter), integrally molded with the cover 100.

[0068] Optionally, it also includes a main control board 90, located at the connection between the upper cover 100 and the outer casing 40.

[0069] The main control board 90 is located at the connection between the upper cover 100 and the outer shell 40. This layout facilitates the connection and signal transmission between the main control board 90 and other components (such as the acquisition module 50, positioning module 60, etc.) inside the upper cover 100 and the outer shell 40. It also simplifies the internal circuit layout and makes it easier to inspect and maintain the main control board 90, ensuring the overall control performance of the detector.

[0070] For example, the main control board 90 uses an ARM Cortex-M4 chip and is located at the junction of the upper cover 100 and the outer shell 40. It is connected to the acquisition module 50, the positioning module 60 and the battery module 80 respectively via ribbon cables.

[0071] Optionally, a detachable base assembly 110 is also included, located at the bottom of the housing 40, to better adapt the installation of the housing 40 to specific usage scenarios. For example, the detachable base assembly 110 includes a pointed tailbone and a flat-bottomed tailbone. Depending on the surface hardening level, a stainless steel pointed tailbone (for soft ground) or a flat-bottomed tailbone (for hardened ground) is selected. The base assembly 110 is connected to the housing 40 by rigid bolts to ensure distortion-free transmission of vibration signals.

[0072] The detector provided in this embodiment is highly integrated and can be considered a single-unit structure. The 36-bit ADC acquisition board, GPS, antenna module 70, and lithium battery are highly integrated, eliminating cable coupling noise from separate systems. A self-healing silicone sealing system (IP68 rating) withstands the high humidity and salt spray environment of Shanghai's coastal areas, and microcapsule repair agents automatically fill cracks, ensuring long-term reliability. Furthermore, the outer high-temperature superconducting thin film actively regulates the internal temperature, supporting operation in a wide temperature range of -20℃ to 60℃, solving the problems of low-temperature drift and high-temperature noise surges in traditional equipment. The lightweight ABS shell 40, top cover 100, and handle 1001 have a single-node weight of <1.5kg, improving deployment efficiency by 50%.

[0073]

[0074] The detector provided in this embodiment is a seismic detector specifically designed for strong EMI scenarios, designed for micro-motion detection of power culverts. The measured data quality meets the AA-level accuracy requirements of the "Specification for Detection of Underground Pipelines in Power Engineering" (DL / T5499-2025), improving construction efficiency by more than 50%, and becoming a revolutionary tool for high-resolution non-destructive detection of urban underground spaces.

[0075] For example, the process of automating the detection of the core module in the detector self-test mode through the built-in script program can be as follows:

[0076] Press the non-removable built-in power button (with external soft rubber protection) on the top of the top cover 100. After the device is powered on, it will automatically enter the self-test mode. At this time, the working status indicator light on the outside of the top cover 100 will indicate the start of the self-test by flashing red and green alternately.

[0077] The script control coil module 10 outputs a preset low-frequency excitation signal (3Hz), which is then monitored by the acquisition module 50 to check the vibration response curve of the magnetofluid module 30 in its levitation state. If the nonlinear distortion rate of the curve is ≤0.5% (meeting the magnetofluid zero-friction design standard), the levitation system is considered normal, and the indicator light turns to "green light on for 2 seconds".

[0078] The built-in signal source generates a 50Hz power frequency analog interference signal. After the main coil and the compensation coil induce each other in reverse, the common-mode rejection ratio is detected by the ADC acquisition board. If the rejection ratio is ≥60dB (meets the requirements for active electromagnetic interference suppression), the coil module 10 is determined to be normal, and the indicator light will remain green for 2 seconds.

[0079] If the GPS / BeiDou dual-mode positioning module 60 starts up, and receives ≥4 satellites within 10 seconds with a positioning error ≤1m, and the antenna module 70 signal strength is stable, then the positioning system is considered to be normal. Simultaneously, the internal communication link between the RS485 and Ethernet interfaces is detected. If there is no packet loss in data transmission, the indicator light will remain on for 2 seconds for the third time.

[0080] The intelligent battery management module detects the lithium battery voltage (3.7V±0.2V) and remaining power (≥20%). At the same time, it starts the temperature control script to simulate internal temperature regulation in an environment of -20℃ to 60℃. If the battery output is stable and the temperature control response time is ≤5 seconds, the power system is judged to be normal, and the indicator light will be "green light on for 2 seconds" for the fourth time.

[0081] After all modules pass the test, the indicator light turns to solid green, and the device automatically enters the data acquisition mode.

[0082] If any module fails to detect, the corresponding indicator light will flash "red" (e.g., if the magnetofluid module 30 fails, the red light will flash after the first detection), and the fault code will be recorded through the internal storage module for later reading and troubleshooting via the internal communication interface of the top cover 100.

[0083] By using scripted automatic detection, errors from manual debugging are avoided, ensuring the reliability of the equipment's initial working state in complex urban environments, reducing invalid data collection caused by hardware failures, and improving the efficiency of field operations.

[0084] This embodiment targets the detection scenario of urban power culverts. Through a triple structural reconstruction design of magnetohydrodynamic module suspension system + dual-coil differential noise reduction + superconducting temperature control integrated packaging, it achieves ultra-high signal-to-noise ratio (SNR) micro-motion signal acquisition, significantly improving the positioning accuracy and anti-environmental interference capability of buried pipelines.

[0085] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims, and the foregoing embodiments should be considered exemplary and non-limiting.

Claims

1. A seismic detector, characterized in that, include: The coil module includes a main coil wound in reverse and a compensation coil; The shielding module is a hollow structure that is fitted onto the outside of the coil module for electromagnetic shielding. The magnetofluid module is located within the coil module and is coaxially arranged with the coil module; The coil module covers part of the magnetofluid module, the shielding module covers part of the coil module, and the shielding module covers the entire area of ​​the magnetofluid module.

2. The seismic detector according to claim 1, characterized in that, The shielding module is a hollow cylindrical structure and is coaxially arranged with the coil module.

3. The seismic detector according to claim 1, characterized in that, The magnetofluid module is suspended within the coil module and is connected to the coil module and / or the shielding module.

4. The seismic detector according to any one of claims 1 to 3, characterized in that, Also includes: The outer shell comprises a one-piece cylindrical shell and a hemispherical shell, with the hemispherical shell located on top of the cylindrical shell; The shielding module is located inside the shell and is fixedly connected to the shell.

5. The seismic detector according to claim 4, characterized in that, The outer circumferential surface of the shielding module abuts against the inner circumferential surface of the cylindrical shell and is coaxially arranged.

6. The seismic detector according to claim 4, characterized in that, Also includes: The acquisition module is located inside the housing, above the coil module, and electrically connected to the coil module.

7. The seismic detector according to claim 4, characterized in that, Also includes: The positioning module is located inside the housing and above the coil module; The antenna module is housed inside the casing and located above the coil module; The positioning module works in conjunction with the antenna module to ensure the positioning accuracy of the seismic detector.

8. The seismic detector according to claim 4, characterized in that, Also includes: The battery module is located inside the housing, below the shielding module, and is electrically connected to the coil module.

9. The seismic detector according to claim 4, characterized in that, Also includes: The top cover is located on the top of the outer casing and is detachably connected to the outer casing; The top cover is connected to the outer shell and has an internal communication interface for manual downloading in case of malfunction.

10. The seismic detector according to claim 9, characterized in that, Also includes: The light source structure is located on the top cover to indicate the working status via indicator lights.

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