High bandwidth radio frequency shielding device and method of making and use thereof

Abstract

The application provides a high-bandwidth radio frequency shielding device and a preparation method and application thereof, and relates to the technical field of metal exploration.The high-bandwidth radio frequency shielding device comprises a shell, a graphene-metal composite coating, a metal connecting plate, a radio frequency connector and a sensor.The high-bandwidth radio frequency shielding device is a low-temperature superconducting sensor radio frequency shielding device based on a graphene-metal composite material.Compared with a radio frequency shielding device prepared from multilayer super-insulating material, the high-bandwidth radio frequency shielding device has high bandwidth, low eddy current, a smooth amplitude-frequency response curve and no resonance peak, and can effectively improve the linearity and detection accuracy of the sensor.The application of the high-bandwidth radio frequency shielding device in the field of metal exploration ensures the stable operation of the sensor, helps to exert the advantages of high sensitivity and low noise of the sensor, and further improves the accuracy, resolution and exploration depth of mineral exploration, and is expected to realize a breakthrough in the exploration of metal mineral resources with a buried depth of more than 3000 meters.

Description

Technical Field

[0001] This invention relates to the field of metal exploration, and in particular to a high-bandwidth radio frequency shielding device, its preparation method, and its application. Background Technology

[0002] For deep ore bodies buried at depths of 500 to 4000 meters, or those covered by deserts, Gobi, or vegetation, the primary detection methods currently used are geophysical methods, including frequency-domain electromagnetic methods, transient electromagnetic methods, and pseudo-random induced polarization (PIP). Among these, transient electromagnetic methods have demonstrated advantages in practical applications, such as large detection depth and high depth resolution. However, the effective detection depth of commonly used transient electromagnetic equipment is typically no more than one kilometer. To further improve detection depth, using sensors with higher sensitivity is one of the most effective means. In transient electromagnetic exploration methods, compared to traditional inductive magnetic field sensors, low-temperature superconducting quantum interference devices (SQUIDs) have higher sensitivity, exceeding that of traditional magnetic induction coils by more than an order of magnitude. Furthermore, the output of SQUID devices is unaffected by frequency, giving them a natural bandwidth advantage in transient electromagnetic detection methods. However, SQUID sensors are highly sensitive to radio frequency signals. Environmental factors such as cloud discharge, communication signals, and noise from heavy mining machinery can all affect sensor operation, even directly causing SQUID sensors to malfunction. To ensure the proper functioning of the SQUID sensor, the cryogenic superconducting detection system used for metal mine exploration must have good radio frequency resistance. At the same time, the transient electromagnetic method for detecting deep-buried metal mines places high bandwidth and low eddy current requirements on the detection equipment.

[0003] In view of the above, the present invention provides a high-bandwidth radio frequency shielding device, its preparation method and application, to solve the problems of weak radio frequency resistance, insufficient bandwidth range, difficulty in adjustment and insufficient self-eddy current in the prior art. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a high-bandwidth radio frequency shielding device, its preparation method and application, so as to solve the problems of weak radio frequency resistance, insufficient bandwidth range, difficulty in adjustment and insufficient self-eddy current in the prior art.

[0005] To achieve the above and other related objectives, the present invention provides a high-bandwidth radio frequency shielding device, the high-bandwidth radio frequency shielding device comprising:

[0006] Housing, graphene-metal composite coating, metal connecting plate, RF connector and sensor;

[0007] The shell has an interior cavity and a through groove at the top, allowing the interior and exterior of the cavity to communicate. The outer surface of the shell is coated with a graphene-metal composite coating.

[0008] The metal connecting plate is located at the through groove at the top of the housing, and the metal connecting plate is provided with a reserved hole;

[0009] The superconducting sensor is located in the cavity of the housing;

[0010] The radio frequency connector is located at the reserved hole on the metal connecting plate and is electrically connected to the superconducting sensor to realize the connection of the electrical signal of the superconducting sensor with the outside.

[0011] The graphene-metal composite coating and the metal connecting plate form a sealed metal cavity, which shields the radio frequency signals outside the housing.

[0012] Optionally, the graphene-metal composite coating is composed of graphene, metal particles, and organic solvents.

[0013] Alternatively, the shell is fabricated by 3D printing of nylon material.

[0014] Optionally, the housing is composed of a first housing and a second housing, wherein the fit between the first housing and the second housing is a tight fit.

[0015] Optionally, the metal connecting plate is connected to the top of the housing by screws, and the metal connecting plate protrudes from the top of the housing.

[0016] Optionally, the high-bandwidth radio frequency shielding device further includes a protective layer located on the surface of the graphene-metal composite coating.

[0017] Optionally, the sensor is a low-temperature superconducting quantum interference sensor.

[0018] The present invention also provides a method for preparing a high-bandwidth radio frequency shielding device, used to prepare any of the high-bandwidth radio frequency shielding devices described above, wherein the method for preparing the high-bandwidth radio frequency shielding device includes:

[0019] S1: Confirm the application requirements of the high-bandwidth radio frequency shielding device;

[0020] S2: Perform the structural design and fabrication of the high-bandwidth radio frequency shielding device;

[0021] S3: Apply a graphene-metal composite coating to the high-bandwidth radio frequency shielding device and conduct comparative tests;

[0022] S4: Compare with the application requirements in step S1. If they are met, proceed with the confirmation test; otherwise, return to step S3.

[0023] Optionally, in step S3, the process of applying the graphene-metal composite coating includes:

[0024] S31: Formulate the coating material for the graphene-metal composite coating;

[0025] S32: Apply the coating evenly;

[0026] S33: Dry the coating to form the graphene-metal composite coating.

[0027] The present invention also provides an application of a high-bandwidth radio frequency shielding device, which is used in the field of metal exploration.

[0028] As described above, the high-bandwidth radio frequency shielding device, its preparation method, and its application of the present invention have the following beneficial effects:

[0029] The high-bandwidth radio frequency shielding device of this invention is a low-temperature superconducting sensor radio frequency shielding device based on graphene-metal composite materials. Compared with radio frequency shielding devices made of multilayer super insulating materials, it has high bandwidth, low eddy current, smooth amplitude-frequency response curve, and no resonance peak, which can effectively improve the linearity and detection accuracy of the sensor. When applied to the field of metal exploration, the high-bandwidth radio frequency shielding device ensures the stable operation of the sensor, helps to give full play to the advantages of the sensor's high sensitivity and low noise, and thus improves the accuracy, resolution and exploration depth of mineral exploration, and is expected to achieve a breakthrough in the exploration of metal mineral resources at a depth of more than 3000 meters. Attached Figure Description

[0030] Figure 1 The diagram shows the amplitude-frequency response curve of a multilayer super-insulated radio frequency shielding device in the prior art.

[0031] Figure 2 The diagram shown is a schematic representation of the high-bandwidth radio frequency shielding device of the present invention.

[0032] Figure 3 The diagram shown is a schematic representation of the first housing of the present invention.

[0033] Figure 4 The diagram shown is a schematic representation of the second housing of the present invention.

[0034] Figure 5 The diagram shown is a schematic of the radio frequency connector of the present invention.

[0035] Figure 6 The diagram shown is a schematic of the metal connecting plate of the present invention.

[0036] Figure 7 The diagram shown is a schematic of the amplitude-frequency response curve of the graphene-metal composite coating of the present invention.

[0037] Figure 8 The diagram shows a process flow chart of the high-bandwidth radio frequency shielding device of the present invention.

[0038] Figure 9 The diagram shows a process flow chart of the graphene-metal composite coating of the present invention.

[0039] Component designation explanation

[0040] 11 First Shell

[0041] 12 Second shell

[0042] 13 Through-slot

[0043] 20 Metal connecting plates

[0044] 21 Reserved holes

[0045] 30 RF connectors

[0046] Steps S1~S4, S31~S33 Detailed Implementation

[0047] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0048] When describing the embodiments of the present invention in detail, for ease of explanation, the cross-sectional views showing the device structure will be partially enlarged without adhering to the general scale, and the schematic diagrams are merely examples and should not limit the scope of protection of the present invention.

[0049] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one structure or feature shown in the accompanying drawings and other structures or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the accompanying drawings for devices in use or operation. Furthermore, when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or there may be one or more layers in between. The term “between” as used herein includes both endpoint values.

[0050] In the context of this application, the structure described above the first feature may include embodiments in which the first and second features are formed in direct contact, or embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0051] Please see Figures 1 to 9 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0052] For signal shielding within 10MHz, a common technique is to place the sensitive element within a sealed cavity formed by metal material. High-frequency signals are rapidly attenuated as they pass through the metal cavity, thus reducing or eliminating interference. However, in transient electromagnetic detection, a strong broadband excitation signal needs to be artificially emitted. The closed metal cavity responds to this excitation, generating a strong eddy current signal. This eddy current signal shares the same characteristics as the signal from the ore body, i.e., the target signal. In practical applications, it is essential to reduce the system's own eddy currents to ensure accurate detection. Currently, existing RF shielding devices for low-temperature superconducting sensors mainly use super-insulators with a thickness ranging from 30μm to 50μm, i.e., a pure aluminum layer of a certain thickness deposited on a polyurethane film. The advantage of this approach is the small thickness of the metal film on the super-insulator, resulting in a weak eddy current response to the excitation signal. However, the shielding effectiveness of a single layer of super-insulator is too low. In practical devices, multiple layers of super-insulator materials are usually required, such as... Figure 1 As shown, taking a sample of multiple multilayer super insulating materials as an example, there will be parasitic capacitance between the multiple layers of super insulation, which will generate resonance in the high-frequency band. The more layers there are, the less monotonic the overall frequency response curve of the device becomes, which seriously affects the accuracy of the detection results.

[0053] Based on the above findings, the inventors proposed a novel composite shielding coating based on graphene, metal particles, and organic solvents to provide radio frequency shielding for sensors, thereby realizing a high-bandwidth, low-eddy-current low-temperature superconducting detection device.

[0054] Example 1

[0055] like Figures 2 to 6 As shown, this embodiment provides a high-bandwidth radio frequency shielding device, which includes:

[0056] The components include a housing, a graphene-metal composite coating, a metal connecting plate 20, an RF connector 30, and a superconducting sensor.

[0057] The shell has an interior cavity and a through groove 13 at the top, which allows the interior and exterior of the cavity to communicate. The outer surface of the shell is coated with a graphene-metal composite coating.

[0058] The metal connecting plate 20 is located at the through groove 13 at the top of the housing, and the metal connecting plate 20 is provided with a reserved hole 21;

[0059] The superconducting sensor is located in the cavity of the housing;

[0060] The radio frequency connector 30 is located at the reserved hole 21 on the metal connecting plate 20 and is electrically connected to the superconducting sensor to realize the connection of the electrical signal of the superconducting sensor with the outside.

[0061] The graphene-metal composite coating and the metal connecting plate 20 form a sealed metal cavity, which shields the radio frequency signals outside the housing.

[0062] The high-bandwidth radio frequency shielding device in this embodiment is a low-temperature superconducting sensor radio frequency shielding device based on graphene-metal composite material. Compared with radio frequency shielding devices made of multilayer super insulating materials, it has high bandwidth, low eddy current, smooth amplitude-frequency response curve, and no resonance peak, which can effectively improve the linearity and detection accuracy of the sensor.

[0063] As an example, the material of the graphene-metal composite coating is composed of graphene, metal particles and organic solvents.

[0064] In this embodiment, the morphology and size of the graphene in the graphene-metal composite coating material, the type and size of the metal particles, the ratio of graphene to metal particles, and the thickness of the graphene-metal composite coating all have a related impact on the shielding effect of the high-bandwidth radio frequency shielding device. The organic solvent, as a blending solvent in the graphene-metal composite coating material, will evaporate during coating formation and will not affect the shielding effect of the high-bandwidth radio frequency shielding device. The specific parameters of the graphene and the metal particles can be set according to the specific requirements of the high-bandwidth radio frequency shielding device, and are not limited here.

[0065] As an example, the shell is fabricated by 3D printing of nylon material.

[0066] The high-bandwidth RF shielding device requires its housing to be as thin as possible. The structure of the housing is tailored to the shape of the sensor. The thicker the housing, the lower the bandwidth of the high-bandwidth RF shielding device. 3D printing the housing from nylon material not only meets the requirements of the high-bandwidth RF shielding device but also offers simple and low-cost fabrication. Furthermore, it allows for 3D printing by pre-scanning the shape of the sensor to obtain relevant appearance information.

[0067] like Figures 3 to 4 As shown, as an example, the housing is composed of a first housing 11 and a second housing 12, and the fit between the first housing 11 and the second housing 12 is a tight fit.

[0068] In this embodiment, both the first housing 11 and the second housing 12 are cylindrical, making it convenient and easy to assemble and disassemble the sensor. They are also simple to manufacture and suitable for sensors of various shapes. The first housing 11 and the second housing 12 fit together tightly, so the graphene-metal composite coating on their surfaces will not be easily damaged during use.

[0069] like Figure 2 and 6 As shown, as an example, the metal connecting plate 20 is connected to the top of the housing by screws, and the metal connecting plate 20 protrudes from the top of the housing to achieve direct contact between the metal connecting plate 20 and the graphene-metal composite coating.

[0070] In this embodiment, the cross-sectional shape of the through groove at the top of the housing is rectangular, and the shape of the metal connecting plate 20 is also rectangular. The shape of the metal connecting plate 20 is slightly larger than the cross-sectional shape of the through groove to ensure that the graphene-metal composite coating and the metal connecting plate 20 form a sealed metal cavity. Screw holes are respectively provided at the top of the housing and around the metal connecting plate 20 for tight connection by screws.

[0071] like Figures 5 to 6 As shown, the cross-sectional shape of the reserved hole 21 on the metal connecting plate 20 needs to match the cross-sectional shape of the radio frequency connector to expose the transmitting end of the radio frequency connector and transmit the electrical signal of the superconducting sensor.

[0072] As an example, the high-bandwidth radio frequency shielding device further includes a protective layer located on the surface of the graphene-metal composite coating.

[0073] In this embodiment, the graphene-metal composite coating is easily damaged during use. The protective layer protects the graphene-metal composite coating, increases its hardness, and makes it waterproof. The material of the protective layer can be set according to actual needs and is not limited here.

[0074] As an example, the sensor is a low-temperature superconducting quantum interference sensor. This low-temperature superconducting quantum interference sensor has high sensitivity, exceeding that of traditional magnetic induction coils by more than an order of magnitude.

[0075] like Figure 7 As shown, in this embodiment, five graphene-metal composite coating samples with different thicknesses were selected, with the thickness gradually increasing from sample 1 to sample 5, and tests were conducted. It can be seen that their amplitude-frequency response curves are smooth and have no resonance peaks. The larger the thickness, the smaller the bandwidth range.

[0076] Example 2

[0077] like Figure 8 As shown, this embodiment provides a method for fabricating a high-bandwidth radio frequency shielding device, used to fabricate the high-bandwidth radio frequency shielding device described in any one of Embodiment 1. The fabrication method includes:

[0078] First, proceed to step S1 to confirm the application requirements of the high-bandwidth radio frequency shielding device.

[0079] Based on the bandwidth range requirements and other requirements of the high-bandwidth radio frequency shielding device in practical applications, the thickness and other relevant parameters of the graphene-metal composite coating are reasonably preset; at the same time, the actual shape and size of the housing are preset according to the actual shape of the sensor; and the sensor and the radio frequency connector 30 corresponding to the application requirements are selected.

[0080] Next, proceed to step S2: design and fabricate the high-bandwidth radio frequency shielding device.

[0081] The high-bandwidth radio frequency shielding device is structurally designed and correspondingly fabricated according to the application requirements in step S1.

[0082] Next, step S3 is performed: a graphene-metal composite coating is applied to the high-bandwidth radio frequency shielding device, and a comparative test is conducted.

[0083] As an example, the process steps for applying the graphene-metal composite coating to the housing include:

[0084] S31: Formulate the coating material for the graphene-metal composite coating;

[0085] S32: Apply the coating evenly;

[0086] S33: Dry the coating to form the graphene-metal composite coating.

[0087] According to the application requirements of the high-bandwidth radio frequency shielding device, the coating material of the graphene-metal composite coating is prepared by mixing graphene, metal particles and organic solvent, and uniformly applying the coating material to the shell. The drying process is carried out at a temperature range of 80℃ to 120℃ to completely evaporate the organic solvent. The complete evaporation of the organic solvent is detected by a test resistor to form the graphene-metal composite coating, which contains only the graphene and the metal particles. Finally, a comparative test is conducted.

[0088] Finally, proceed to step S4: compare the application requirements in step S1. If they are met, perform a confirmation test; if not, return to step S3.

[0089] The thickness of the graphene-metal composite coating is tested to see if it meets the application requirements in step S1. If it does, a protective layer is applied to the graphene-metal composite coating to prevent damage during use, increase its hardness, and make it waterproof. A final functional test is then performed. If the application requirements are not met, the process returns to step S3 to continue applying the graphene-metal composite coating. In steps S3 to S4, the thickness of the graphene-metal composite coating is generally controlled by empirical values. A thin coating is applied at the critical value, and repeated comparative tests are conducted to achieve the corresponding application requirements.

[0090] Once the high-bandwidth radio frequency shielding device is manufactured, it can be placed into the detection system equipment for verification testing.

[0091] Example 3

[0092] This embodiment provides an application of the high-bandwidth radio frequency shielding device as described in Embodiment 1, which is used in the field of metal exploration.

[0093] This embodiment is applied in the field of metal exploration. The high-bandwidth radio frequency shielding device ensures the stable operation of the sensor, which helps to give full play to the advantages of the sensor's high sensitivity and low noise, thereby improving the accuracy, resolution and exploration depth of mineral exploration, and is expected to achieve a breakthrough in the exploration of metal mineral resources at a depth of more than 3,000 meters.

[0094] In summary, this invention proposes a high-bandwidth radio frequency shielding device, its preparation method, and its application. The high-bandwidth radio frequency shielding device includes: a housing, a graphene-metal composite coating, a metal connecting plate, a radio frequency connector, and a sensor. The housing has an internal cavity with a through groove at the top, allowing the cavity to be open to the outside. The outer surface of the housing is coated with a graphene-metal composite coating. The metal connecting plate is located at the through groove at the top of the housing and has a pre-drilled hole. The superconducting sensor is located within the cavity of the housing. The radio frequency connector is located at the pre-drilled hole on the metal connecting plate and is electrically connected to the superconducting sensor to enable the electrical signal of the superconducting sensor to be connected to the outside. The graphene-metal composite coating and the metal connecting plate form a sealed metal cavity, which shields radio frequency signals outside the housing. This invention presents a high-bandwidth radio frequency (RF) shielding device based on graphene-metal composite materials for low-temperature superconducting sensors. Compared to RF shielding devices made of multilayer super insulating materials, it offers higher bandwidth, lower eddy currents, a smoother amplitude-frequency response curve, and no resonance peaks, effectively improving the linearity and detection accuracy of the sensor. Applied to the field of metal exploration, this high-bandwidth RF shielding device ensures stable sensor operation, helping to leverage the sensor's high sensitivity and low noise advantages, thereby improving the accuracy, resolution, and exploration depth of mineral exploration. It is expected to achieve breakthroughs in the exploration of metal mineral resources at depths greater than 3000 meters. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and possesses high industrial application value.

[0095] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A radio frequency shielding device for a low-temperature superconducting sensor, characterized in that, The radio frequency shielding device for the low-temperature superconducting sensor includes: Housing, graphene-metal composite coating, metal connecting plate, RF connector and sensor; The shell has an interior cavity and a through groove at the top to allow the interior and exterior of the cavity to communicate. The outer surface of the shell is coated with a graphene-metal composite coating, the material of which includes uniformly mixed graphene and metal particles. The metal connecting plate is located at the through groove at the top of the housing, and the metal connecting plate is provided with a reserved hole, and the metal connecting plate protrudes from the top of the housing; The superconducting sensor is located in the cavity of the housing; The radio frequency connector is located at the reserved hole on the metal connecting plate and is electrically connected to the superconducting sensor to realize the connection of the electrical signal of the superconducting sensor with the outside. The graphene-metal composite coating and the metal connecting plate form a sealed metal cavity, which shields the radio frequency signals outside the housing.

2. The radio frequency shielding device for a low-temperature superconducting sensor according to claim 1, characterized in that: The shell is fabricated using 3D printing of nylon material.

3. The radio frequency shielding device for a low-temperature superconducting sensor according to claim 1, characterized in that: The housing is composed of a first housing and a second housing, and the fit between the first housing and the second housing is a tight fit.

4. The radio frequency shielding device for a low-temperature superconducting sensor according to claim 1, characterized in that: The metal connecting plate is connected to the top of the housing by screws, and the metal connecting plate protrudes from the top of the housing.

5. The radio frequency shielding device for a low-temperature superconducting sensor according to claim 1, characterized in that: The radio frequency shielding device for the low-temperature superconducting sensor also includes a protective layer located on the surface of the graphene-metal composite coating.

6. The radio frequency shielding device for a low-temperature superconducting sensor according to claim 1, characterized in that: The sensor is a low-temperature superconducting quantum interference sensor.

7. A method for preparing a radio frequency shielding device for a low-temperature superconducting sensor as described in any one of claims 1 to 6, characterized in that, The method for preparing the radio frequency shielding device for the low-temperature superconducting sensor includes: S1: Confirm the application requirements of the radio frequency shielding device for the low-temperature superconducting sensor; S2: Perform the structural design and fabrication of the radio frequency shielding device for the low-temperature superconducting sensor; S3: Apply a graphene-metal composite coating to the radio frequency shielding device of the low-temperature superconducting sensor and conduct comparative tests; S4: Compare with the application requirements in step S1. If they are met, proceed with the confirmation test; otherwise, return to step S3.

8. The method for preparing the radio frequency shielding device for a low-temperature superconducting sensor according to claim 7, characterized in that: In step S3, the process of applying the graphene-metal composite coating includes: S31: Formulate the coating material for the graphene-metal composite coating; S32: Apply the coating evenly; S33: Dry the coating material to form the graphene-metal composite coating.

9. The application of a radio frequency shielding device for a low-temperature superconducting sensor as described in any one of claims 1 to 6, characterized in that: The radio frequency shielding device for the low-temperature superconducting sensor is used in the field of metal exploration.

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