A high-pressure-resistant sensor and a method for manufacturing the same

Abstract

The application relates to a high-pressure-resistant sensor and a preparation method thereof, which comprises a shell, a sensing unit and a cover body. The shell comprises a body and a cover body, the body has a cavity inside, and one end of the body in the length direction has an opening. The cover body is detachably arranged at the opening to seal the shell. The sensing unit is accommodated in the cavity. The sensing unit comprises a double-coil vibration head module and a signal enhancement module. The double-coil vibration head module comprises a support framework, a magnetic tank and a coil assembly. The coil assembly is arranged on the support framework. The coil assembly comprises an inner coil and an outer coil which are coaxially arranged. The diameter of the outer coil is larger than that of the inner coil. The axial direction of the inner coil and the outer coil is consistent with the length direction of the body. The signal enhancement module is coaxially arranged on the periphery of the double-coil vibration head module. The application can make the signal penetration ability stronger and can penetrate thicker metal shells. In addition, the application wraps the magnetic tank and the coil assembly with a high-permeability strip-shaped amorphous nanocrystalline material, effectively enhancing the signal penetration ability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensors, in particular to a high-pressure-resistant sensor and a preparation method thereof. BACKGROUND

[0002] Hydraulic systems are widely used in key fields such as industrial equipment (e.g., injection molding machines, presses), engineering machinery (e.g., excavators, cranes), aerospace, and heavy vehicles due to their high power density, flexible layout, and precise control. Hydraulic cylinders, as the execution components of the system, convert hydraulic energy into mechanical energy and usually work in cooperation with high-pressure pipelines. Therefore, the reliability, efficiency, and safety of the entire energy system depend on the accurate perception and closed-loop control of the working state of these core components. Therefore, the requirements for sensors used in hydraulic cylinders and high-pressure pipelines are also high. Such sensor products can monitor key states and parameters in the hydraulic system, including but not limited to real-time monitoring of pressure, temperature, position, and other parameters, thereby cooperating with the control end to achieve intelligent control, fault diagnosis, and predictive maintenance.

[0003] However, the existing sensor products in the industry still have the following shortcomings. First, the penetration performance of traditional single-coil sensors is weak. Since the input and output signal links are close, the output end has weak anti-interference ability, the detection distance of the sensor is short, and it cannot be used with a thick shell, resulting in poor pressure resistance of the product. In addition, the end face of the existing sensor metal shell is thin, and long-term work in a high-pressure environment can cause deformation of the shell end face, affecting the detection effect of the product. Moreover, after a long time of work, the deformation of the shell is not recoverable, causing changes in the detection distance of the sensor and affecting the detection effect. In addition, under long-term high-pressure environment, pressure is applied to the internal structure through the shell, causing cracks in the structure inside the shell and affecting the function of the product. Although some products use high-pressure-resistant ceramic end face shells, the ceramic body and metal connection may be affected by long-term high-pressure environment, causing oil ingress and affecting the performance of the sensor. SUMMARY

[0004] Therefore, the present application aims to overcome the shortcomings of the prior art and provide a high-pressure-resistant sensor and a preparation method thereof to solve the problems of low pressure resistance, short distance, thin shell, and weak anti-interference ability of existing products.

[0005] To solve the above technical problems, the present application provides a high-pressure-resistant sensor, which comprises a shell, the shell comprising a body and a cover, the body having a cavity inside, an opening at one end along the length direction of the body, and the cover being detachably arranged at the opening to close the shell.

[0006] A sensing unit is housed within the cavity. The sensing unit includes a dual-coil vibrating head module and a signal enhancement module. The dual-coil vibrating head module includes a support frame, a magnetic container, and a coil assembly. The coil assembly is assembled to the support frame, and the magnetic container is housed within the support frame. The coil assembly includes an inner coil and an outer coil arranged coaxially. The diameter of the outer coil is larger than the diameter of the inner coil, and the axial directions of the inner and outer coils are aligned with the length direction of the body. The signal enhancement module is coaxially disposed around the periphery of the dual-coil vibrating head module.

[0007] The control unit includes a control module and a transmission cable. The control module is housed in the housing. One end of the transmission cable is electrically connected to the control module, and the other end of the transmission cable passes through the cover and extends to the outside of the housing. The dual-coil vibrator module is electrically connected to the control module to generate a pulse signal. The pulse signal is amplified by the signal amplification module, passes through the housing, and is emitted.

[0008] In one embodiment of the present invention, the signal enhancement module includes a conductive tape body, which is wound around the outside of the support frame.

[0009] In one embodiment of the present invention, the conductive tape body is made of amorphous nanocrystalline material.

[0010] In one embodiment of the present invention, the sensing unit further includes a magnetic can, which is housed in the support frame and coaxially disposed with the support frame. The magnetic can has an annular receiving groove, and the inner coil is confined within the receiving groove.

[0011] In one embodiment of the present invention, a shielding body is further included, which is housed in the cavity and located between the sensing unit and the housing; the shielding body and the housing are mutually insulated.

[0012] In one embodiment of the present invention, the shielding body includes a shielding layer coaxially disposed with the housing, the shielding layer being disposed around the outside of the signal enhancement module; the shielding layer includes shielding copper foil.

[0013] In one embodiment of the present invention, the housing is made of stainless steel and the end face thickness of the housing is 1.5-2.5 mm; the cavity is filled with sealant.

[0014] In one embodiment of the present invention, the transmission cable is provided with a protective structure, the protective structure including a corrugated pipe.

[0015] In one embodiment of the present invention, the control module includes a circuit module and an internal power supply module. The circuit module includes a positive and negative spike pulse signal generation circuit, an analog signal processing circuit, an anti-interference circuit, an analog-to-digital conversion output circuit, and a protection circuit. The internal power supply module includes a voltage regulator and a voltage follower circuit.

[0016] This invention also provides a method for fabricating a high-voltage resistant sensor, used to fabricate the high-voltage resistant sensor described above, the method comprising:

[0017] Step S1: Assemble the coil assembly to the support frame and fix the coil assembly;

[0018] Step S2: Connect the coil assembly to the control module so that the coil assembly and the control module are electrically connected;

[0019] Step S3: A signal enhancement module is installed around the support frame;

[0020] Step S4: Connect the control module to the transmission cable to insulate the control module from the housing;

[0021] Step S5: The structure assembled in steps S1 to S4 is inserted into the main body and glue is applied for the first time; then the resistance is adjusted and glue is applied for the second time; finally, the cover is installed onto the main body to form a sealed cavity.

[0022] The technical solution of the present invention has the following advantages compared with the prior art:

[0023] This invention discloses a high-voltage resistant sensor comprising a housing, a sensing unit, and a control unit. The sensing unit includes a dual-coil oscillator module housed within the housing and a signal enhancement module. The signal enhancement module is coaxially disposed around the dual-coil oscillator module. The dual-coil oscillator module includes a support frame, a magnetic canister, and a coil assembly. The coil assembly includes an inner coil and an outer coil arranged sequentially along the radial direction of the housing. The control unit includes a control module connected to the dual-coil oscillator module. A spike pulse signal is generated by the alternating conduction of the inner and outer coils. The magnetic field generated by the outer coil can envelop the magnetic field generated by the inner coil, forming an ellipsoidal magnetic field, which has stronger penetrating power compared to traditional sinusoidal oscillation signals. Combined with the signal enhancement module, the spike pulse signal is further amplified, enhancing its penetrating ability. Furthermore, the support frame encloses and supports the coil assembly and the magnetic canister, providing support and protection for the coil assembly while preventing cracks in the magnetic canister. Additionally, the cavity of this invention is a sealed structure, and the body is designed as a single piece, thus preventing seepage and oil ingress at the junction of different materials. Attached Figure Description

[0024] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0025] Figure 1 This is a first-view schematic diagram of the overall structure of a preferred embodiment of the present invention.

[0026] Figure 2 This is a front view of the overall structure of a preferred embodiment of the present invention.

[0027] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure.

[0028] Figure 4 yes Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0029] Figure 5 This is an exploded view of the overall structure of a preferred embodiment of the present invention.

[0030] Figure 6 This is an exploded view of the sensing unit according to a preferred embodiment of the present invention.

[0031] Figure 7 This is a schematic diagram of the circuit principle of the control module according to a preferred embodiment of the present invention.

[0032] Explanation of reference numerals in the accompanying drawings: 1. Housing; 10. Body; 11. Cover; 2. Dual-coil vibrator module; 20. Support frame; 21. Coil assembly; 210. Inner coil; 211. Outer coil; 2110. High-temperature tape; 22. Magnetic can; 3. Signal enhancement module; 4. Control module; 5. Transmission cable; 6. Shielding; 7. Connector. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0034] Example 1:

[0035] Reference Figures 1 to 7 As shown, the present invention discloses a high-voltage resistant sensor, including a housing. The housing 1 includes a body 10 and a cover 11. The body 10 has a cavity inside and an opening at one end along the length direction of the body 10. The cover 11 is detachably disposed at the opening by fasteners to close the housing 1. The body is an integrally formed structure.

[0036] The high-voltage sensor also includes a sensing unit housed in the cavity, and the sensing unit includes a dual-coil vibrator module 2 and a signal enhancement module 3.

[0037] Specifically, the dual-coil vibrator module 2 includes a support frame 20, a coil assembly 21, and a magnetic container 22. The coil assembly 21 is disposed on the support frame 20, and the magnetic container 22 is housed within the support frame 20. The coil assembly 21 includes an inner coil 210 and an outer coil 211 coaxially arranged. The diameter of the outer coil 211 is larger than the diameter of the inner coil 210, and the axial directions of the inner coil 210 and the outer coil 211 are consistent with the length direction of the body 10.

[0038] The signal enhancement module 3 is coaxially disposed around the periphery of the dual-coil vibrator module 2.

[0039] The high-voltage sensor also includes a control unit, which comprises a control module 4 and a transmission cable 5. The control module 4 is housed within the housing 1. One end of the transmission cable 5 is electrically connected to the control module 4, and the other end of the transmission cable 5 passes through the cover 11 and extends to the outside of the housing 1. The dual-coil vibrator module 2 is electrically connected to the control module 4 to generate a pulse signal. The pulse signal is amplified by the signal enhancement module 3, passes through the housing 1, and is emitted.

[0040] Therefore, it can be understood that the high-voltage sensor protected by this invention includes a housing 1, a sensing unit, and a control unit. The sensing unit includes a dual-coil vibrating head module 2 and a signal enhancement module 3 housed in the housing 1. The signal enhancement module 3 is coaxially disposed around the dual-coil vibrating head module 2. The dual-coil vibrating head module includes a support frame 20, a magnetic container 22, and a coil assembly 21. The coil assembly 21 includes an inner coil 210 and an outer coil 211 arranged sequentially along the radial direction of the housing 1. The control unit includes a control module connected to the dual-coil vibrating head module 2. During operation, the inner coil 210 and the outer coil 211 are alternately energized to generate voltage. The spike pulse signal, the magnetic field generated by the outer coil 211 can wrap the magnetic field generated by the inner coil 210, thereby forming an ellipsoidal magnetic field, which has stronger penetrating power than the traditional sine wave oscillation signal; in conjunction with the signal enhancement module, the spike pulse signal is further amplified, enhancing the penetration ability of the spike pulse signal. In addition, the support frame 20 wraps and supports the coil assembly 21, thereby providing good support and protection for the coil assembly 21 and the magnetic can 22; furthermore, the cavity of the present invention is a sealed structure, and the body 10 adopts an integral molding design, thereby avoiding the penetration and oil ingress at the junction of the end faces of different materials.

[0041] Furthermore, the magnetic container 22 is coaxially arranged with the supporting frame 20, and the magnetic container 22 has an annular receiving groove, in which the inner coil 210 is received and confined. This arrangement improves structural stability and mechanical protection, ensuring that the central axes of the magnetic container 22, the supporting frame 20, and the coil assembly 21 are completely aligned; effectively avoiding mechanical stress caused by eccentricity, resulting in uniform stress distribution throughout the assembly, a more stable structure, and stronger vibration and impact resistance; in addition, the annular receiving groove also provides good confinement, precisely wrapping and fixing the inner coil 210 within it, preventing loosening, displacement, or deformation due to vibration during transportation, installation, or operation, ensuring the long-term stability of the product in harsh environments; furthermore, the magnetic container 22 also reduces magnetic circuit resistance. To improve magnetic permeability, the magnetic container is typically made of ferrite material with high permeability. The coaxial arrangement ensures that the magnetic field generated by the coil is completely aligned with the magnetic circuit of the magnetic container 22, allowing the magnetic lines of force to pass through the magnetic container 22 in the smoothest path to form a closed loop. This minimizes magnetic resistance and magnetic leakage in the magnetic circuit and improves the conversion efficiency of magnetic energy. Finally, since the annular structure of the magnetic container 22 can effectively confine the magnetic field generated by the coil assembly 21 and concentrate it mainly inside the magnetic container 22, the leakage of the magnetic field to the outside is significantly reduced, thereby reducing electromagnetic interference and making it less susceptible to interference from external magnetic fields.

[0042] Furthermore, the signal enhancement module 3 includes a conductive tape body, which is wound around the outside of the support frame 20. This arrangement enables efficient and uniform magnetic signal guidance and convergence. By winding the conductive tape body onto the support frame, magnetic field signals are effectively collected, guided, and converged, forming an efficient magnetic path. Simultaneously, it reduces the scattering and loss of magnetic field lines, allowing them to pass more concentratedly through the sensing area, thus significantly enhancing the strength and signal-to-noise ratio of the detected signal. In addition, the wound layout fully utilizes the entire outer space of the support frame 20, achieving the maximum magnetic signal contact and action area within a limited volume, improving structural compactness. Therefore, it is also suitable for small, precision electronic devices with strict space constraints. By tightly winding the conductive tape body around the support frame 20, the two can be combined to form a robust overall structure, possessing good mechanical stability and reliability, effectively resisting vibration and impact, ensuring long-term operational stability and reliability, and extending the service life of the device.

[0043] In addition, in different implementations, by changing the material, number of turns, number of layers of the conductive tape body and the geometry of the support frame 20, the permeability, frequency response and gain characteristics of the signal enhancement module can be flexibly adjusted, thereby meeting the diverse requirements for magnetic signal strength in different application scenarios and improving the adaptability of the product.

[0044] In a preferred embodiment, the outer wall of the support frame 20 is provided with a mounting groove along the circumference, so that the conductive tape body can be embedded in the mounting groove.

[0045] Preferably, the support frame 20 is made of plastic.

[0046] Preferably, the conductive tape body is made of amorphous nanocrystalline material. Since amorphous nanocrystalline material itself has the characteristics of high magnetic permeability and good thermal stability, it can further amplify the peak pulse signal and enhance the signal penetration ability when combined with the magnetic can 22.

[0047] Furthermore, by enclosing the magnetic can 22 with the support frame 20, compared to the exposed setting of the magnetic can in the prior art, the magnetic can 22 can be better protected under long-term high pressure environment, preventing it from cracking.

[0048] To prevent external electromagnetic interference to the electronic signal of the high-voltage sensor, and to prevent electromagnetic noise generated by the high-voltage sensor itself from interfering with other equipment, the high-voltage sensor further includes a shield 6. The shield 6 is housed within the cavity and located between the sensing unit and the housing 1. Insulating tape is wrapped around the outer periphery of the shield 6, thereby isolating the shield 6 from the housing 1 and achieving insulation.

[0049] In a preferred embodiment, the shielding body includes a shielding layer coaxially disposed with the housing, the shielding layer being disposed around the outside of the signal enhancement module 3.

[0050] It is important to note that the shielding layer must be grounded. The shielding copper foil is usually connected to the system ground (GND) to provide a low-impedance discharge path for the current induced in the shielding layer, thereby truly achieving the shielding effect.

[0051] Preferably, the shielding layer is made of shielding copper foil. Since copper is an excellent conductor, when external electromagnetic waves attempt to penetrate the copper foil, induced eddy currents are generated on the surface of the shielding copper foil due to the Faraday cage effect. These eddy currents generate an electromagnetic field with the opposite direction and equal intensity to the original interfering electromagnetic field, effectively canceling and reflecting most of the incident electromagnetic energy and preventing it from entering the sensing unit. Furthermore, it also acts as an electrostatic shield, effectively preventing the accumulation and discharge of static charge from damaging internal precision components. The shielding copper foil guides the static charge to the ground (through grounding), thereby protecting the core circuit module. The shielding copper foil itself also has a certain mechanical strength, providing a degree of physical protection for internal structural components. Moreover, since copper is a good thermal conductor, it helps the sensor dissipate internal heat.

[0052] The housing 1 is made of stainless steel, and the thickness of the end face of the housing 1 is 1.5-2.5 mm; preferably, the thickness of the end face of the housing 1 is 1.8 mm, which can withstand 100 MPa oil pressure, thereby preventing the housing 1 from deforming after long-term use, thus affecting the monitoring distance of the product and ensuring the accuracy of the sensor detection data. This also prevents the magnetic container 22 from cracking due to excessively thin housing 1 under long-term pressure. Furthermore, because the housing 1 of this invention is relatively thick, it can prevent the magnetic container 22 from cracking under long-term pressure, thus preventing it from affecting the product's detection distance and the accuracy of the detection results.

[0053] Furthermore, to improve the sealing performance and thermal stability of the sensor, the cavity is filled with sealant. In a preferred embodiment, the sealant is black glue. By injecting black glue into the cavity, the high-voltage sensor achieves good sealing performance and thermal stability, enabling it to operate within a temperature range of -40℃ to 100℃.

[0054] In a preferred embodiment, the transmission cable 5 is provided with a protective structure on its exterior. Preferably, the protective structure includes, but is not limited to, a corrugated pipe, which can effectively protect the transmission cable 5 and prevent it from being broken.

[0055] In detail, the control module 4 includes a circuit module and an internal power supply module.

[0056] The circuit module includes a positive and negative spike pulse signal generation circuit, an analog signal processing circuit, an anti-interference circuit, an analog-to-digital conversion output circuit, and a protection circuit.

[0057] The internal power module includes a voltage regulator and a voltage follower circuit. Specifically, the voltage regulator is a low-dropout linear voltage regulator composed of discrete components, and the voltage follower circuit includes an operational amplifier assembly.

[0058] In a preferred embodiment, the positive and negative spike pulse generation circuit includes discrete components such as operational amplifiers, D flip-flops, and transistors. After the positive and negative pulse signals are amplified by the transistors, the signals alternately pass through the inner coil 210 and the outer coil 211. The change in electric field generates a magnetic field signal, which is then amplified by the magnetic can 22 and the wrapped strip-shaped amorphous nanocrystal (conductive magnetic tape), enabling the signal to penetrate the thick stainless steel shell end face.

[0059] The analog signal processing circuit processes the mixed signal generated by the dual-coil oscillator module 2 and the externally induced signal. The analog signal processing circuit includes an integrating circuit and a differential amplifier circuit built from discrete components such as transistors, operational amplifiers, and resistors and capacitors.

[0060] The anti-interference circuit consists of an operational amplifier; together with the analog-to-digital converter output circuit, it converts the processed analog signal into a digital switching signal.

[0061] The protection circuit includes a surge protection circuit composed of discrete components such as TVS diodes and transistors, a reverse connection protection circuit, and an overcurrent protection circuit, thereby achieving a surge protection level of up to 4KV.

[0062] It should be noted that the high-voltage sensor also includes a connector 7, which is connected to the end of the transmission cable 5. This enables the efficient and distortion-free transmission of the high-voltage sensor's sensing signal to subsequent display instruments, controllers, or data acquisition systems. Simultaneously, the connector 7 also ensures a stable external power supply to the high-voltage sensor, guaranteeing its normal operation.

[0063] Example 2:

[0064] This invention also discloses a method for fabricating a high-voltage resistant sensor, used to fabricate the high-voltage resistant sensor as described in Example 1, the method comprising:

[0065] Step S1: Assemble the coil assembly 21 to the support frame 20 and fix the coil assembly 21 to the support frame 20;

[0066] Step S2: Connect the coil assembly 21 to the control module 4 so that the coil assembly 21 and the control module 4 are electrically connected;

[0067] Step S3: A signal enhancement module 3, a shield 6, and insulating tape are installed around the support frame 20.

[0068] Step S4: Connect the control module 4 to the transmission cable 5 to insulate the control module 4 from the housing 1;

[0069] Step S5: The structure assembled in steps S1 to S4 is inserted into the body 10, glue is applied once, the resistance is adjusted, glue is applied a second time, and then the cover 11 is installed into the body 10 to form a sealed shell 1.

[0070] Specifically, in one particular embodiment of the present invention:

[0071] In step S1, the inner coil 210 is first placed inside the magnetic container 22 and fixed with glue. Then, the magnetic container 22 with the inner coil 210 is assembled onto the support frame 20, and the outer coil 211 is wound around the outside of the support frame 20. The outer coil 211 is then wrapped with high-temperature tape 2110 for isolation. Preferably, the glue used is 304 fast-drying adhesive.

[0072] Next, in step S2, the inner coil 210, the outer coil 211, and the support frame 20 are fixedly positioned at one end of the circuit board of the control module 4 and fixed with 304 quick-drying adhesive. The connectors of the inner coil 210 and the outer coil 211 are soldered to the solder joints of the circuit board. Throughout the process, the leads of the inner coil 210 and the outer coil 211 are kept loose and the coil leads are adhered and fixed to the circuit board with insulating tape to prevent the coil leads from breaking due to the later curing of the adhesive and thermal shock.

[0073] Furthermore, in step S3, at least two turns of conductive tape (ribbon-shaped amorphous nanocrystalline material) are wound around the outside of the support frame 20, and transparent tape is wrapped around the outer periphery of the conductive tape to provide insulation.

[0074] Furthermore, the structure formed in step S3 is covered with a shielding copper foil, that is, the shielding copper foil is wrapped around the outer side of the inner coil 210, the outer coil 211, the support frame 20, and the conductive tape body, and the shielding copper foil is grounded. Transparent tape is wrapped around the shielding copper foil to isolate the shielding copper foil from the housing 1.

[0075] In step S4, the transmission cable 5 and the circuit board are welded together, and the circuit board is wrapped with PTFE tape to isolate the circuit board from the housing 1.

[0076] In step S5, the components assembled in steps S1-S4 are inserted into the body 10 for the first injection of glue. After the glue has cured, the resistance value is adjusted so that the detection distance of the product reaches the set value.

[0077] Next, a second gluing process is performed, followed by assembly of the cover 11 and installation of the corrugated pipe to the transmission cable 5.

[0078] The high-voltage sensor prepared by the method of this invention features inner and outer dual coils, which, in conjunction with the circuit structure of the control module, can generate positive and negative spike pulses, thereby enhancing signal penetration and enabling it to penetrate thicker metal shells. The magnetic canister and coil assembly are encapsulated using a strip-shaped amorphous nanocrystalline material with high magnetic permeability, effectively enhancing signal penetration. Furthermore, a shielding copper foil is placed inside the shell and grounded, effectively enhancing the sensor's anti-interference capability. Simultaneously, the fully enclosed metal shell design, combined with an internal potting process, enables the sensor to achieve an IP68 waterproof rating. It also ensures the stability of the magnetic canister, preventing cracking under high-voltage conditions and effectively avoiding shell deformation.

[0079] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0080] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0081] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A high pressure resistant sensor, characterized by: include, A housing includes a body and a cover. The body has a cavity inside and an opening at one end along the length of the body. The cover is detachably disposed at the opening to close the housing. A sensing unit is housed within the cavity. The sensing unit includes a dual-coil vibrating head module and a signal enhancement module. The dual-coil vibrating head module includes a support frame, a magnetic container, and a coil assembly. The coil assembly is assembled to the support frame, and the magnetic container is housed within the support frame. The coil assembly includes an inner coil and an outer coil arranged coaxially. The diameter of the outer coil is larger than the diameter of the inner coil, and the axial directions of the inner and outer coils are aligned with the length direction of the body. The signal enhancement module is coaxially disposed around the periphery of the dual-coil vibrating head module. The control unit includes a control module and a transmission cable. The control module is housed in the housing. One end of the transmission cable is electrically connected to the control module, and the other end of the transmission cable passes through the cover and extends to the outside of the housing. The dual-coil vibrator module is electrically connected to the control module to generate a pulse signal. The pulse signal is amplified by the signal amplification module, passes through the housing, and is emitted. It also includes a preparation method for preparing the high-voltage resistant sensor as described above, the preparation method comprising, Step S1: Assemble the coil assembly to the support frame and fix the coil assembly; Step S2: Connect the coil assembly to the control module so that the coil assembly and the control module are electrically connected; Step S3: A signal enhancement module is installed around the support frame; Step S4: Connect the control module to the transmission cable to insulate the control module from the housing; Step S5: The structure assembled in steps S1 to S4 is inserted into the main body and glue is applied for the first time; then the resistance is adjusted and glue is applied for the second time; finally, the cover is installed onto the main body to form a sealed cavity.

2. A high pressure resistant sensor according to claim 1, characterized in that: The signal enhancement module includes a conductive tape body, which is wound around the outside of the support frame.

3. A high pressure resistant sensor according to claim 2, characterized in that: The conductive tape body is made of amorphous nanocrystalline material.

4. The high pressure resistant sensor of claim 1, wherein: The magnetic container is coaxially arranged with the supporting frame; the magnetic container has an annular receiving groove, and the inner coil is confined within the receiving groove.

5. The high pressure resistant sensor of claim 1, wherein: It also includes a shield, which is housed in the cavity and located between the sensing unit and the housing; the shield and the housing are mutually insulated.

6. A high pressure resistant sensor according to claim 5, characterized in that: The shielding body includes a shielding layer coaxially disposed with the housing, and the shielding layer is disposed around the outside of the signal enhancement module; the shielding layer includes shielding copper foil.

7. The high pressure resistant sensor of claim 1, wherein: The housing is made of stainless steel, and the end face thickness of the housing is 1.5-2.5mm; the cavity is filled with sealant.

8. The high pressure resistant sensor of claim 1, wherein: The transmission cable is provided with a protective structure on the outside, and the protective structure includes a corrugated pipe.

9. A high pressure resistant sensor according to any one of claims 1-8, characterized in that: The control module includes a circuit module and an internal power supply module. The circuit module includes a positive and negative spike pulse signal generation circuit, an analog signal processing circuit, an anti-interference circuit, an analog-to-digital conversion output circuit, and a protection circuit. The internal power supply module includes a voltage regulator and a voltage follower circuit.

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