Electromagnetic shielding device

Abstract

The invention relates to an electromagnetic shielding device, belonging to the technical field of electromagnetic protection, comprising: an optical module, a hemispherical shield and a shielding net, wherein the optical module is rotatably connected to a mounting body; the hemispherical shield is detachably connected to the mounting body, and the hemispherical shield is arranged on the outer side of the optical module; the shielding net is printed on the inner side of the hemispherical shield, and the shielding net has light transmittance and conductivity; the device can solve the technical problem that the optical window arranged on the double-layer metal shielding shell in the prior art does not have an electromagnetic shielding effect, which will cause loopholes in the overall electromagnetic shielding performance and reduce the electromagnetic shielding effect.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic protection, and in particular relates to an electromagnetic shielding device. Background Art

[0002] Spherical photoelectric pods mainly rely on precise electronic equipment and optical systems to work. They are mainly installed in aircraft, cars, fixed buildings and other locations for measurement and observation. During use, electromagnetic pulses will have a significant impact on spherical photoelectric pods. Therefore, designing an effective and reliable electromagnetic shielding device is a technical problem that needs to be solved urgently for those skilled in the art.

[0003] The existing patent with application number 202011608509.6 discloses an aviation optoelectronic pod, which includes: a pod body, which includes a pod shell and a pod cavity; the pod shell is a double-layer metal shielding shell; a metal chamber body, which is placed inside the pod cavity and is used to accommodate circuit modules with different functions; and an optical window arranged on the pod shell.

[0004] The prior art has the following problems:

[0005] The existing spherical optoelectronic pod uses a double-layer metal shielding shell as an electromagnetic shielding device, and the optical window arranged thereon does not have an electromagnetic shielding effect, which will cause loopholes in the overall electromagnetic shielding performance and reduce the electromagnetic shielding effect. Summary of the invention

[0006] The present invention provides an electromagnetic shielding device, which can solve the technical problem in the prior art that the optical window arranged on the double-layer metal shielding shell does not have the electromagnetic shielding effect, which will cause loopholes in the overall electromagnetic shielding performance and reduce the electromagnetic shielding effect.

[0007] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0008] The present application provides an electromagnetic shielding device, which includes: an optical module, a hemispherical shield and a shielding net, wherein the optical module is rotatably connected to a mounting body; the hemispherical shield is detachably connected to the mounting body, and the hemispherical shield is arranged on the outside of the optical module; the shielding net is printed on the inside of the hemispherical shield, and the shielding net has light transmittance and conductivity.

[0009] Through the above technical solution, a hemispherical shield is used to provide comprehensive protection for the optical module. The light-transmitting and conductive shielding net printed on the inside of the hemispherical shield will not affect the normal operation of the optical module while protecting against electromagnetic pulses, thereby improving the magnetic shielding effect of the spherical optoelectronic pod.

[0010] In the present invention, the shielding net has a plurality of regular hexagonal meshes.

[0011] Through the above technical solution, the regular hexagonal mesh has higher space utilization and symmetry. Compared with the square grid, the regular hexagonal grid has a shorter total wire length under the same coverage area (when the grid size and wire thickness are the same), which means that the path through which the current passes is shorter, thus having a smaller resistance.

[0012] In the present invention, the electromagnetic shielding device also includes a sealing cover, a one-way air valve and a fairing. The sealing cover is connected to the connection between the optical module and the mounting body, and a sealed space is formed between the sealing cover and the hemispherical shield. The one-way air valve is plugged into the hemispherical shield, and the one-way air valve allows the gas in the hemispherical shield to be discharged outward. The fairing is plugged into the hemispherical shield, and the fairing is arranged on the outside of the one-way air valve.

[0013] Through the above technical solution, a one-way air valve and a sealing cover are used. After assembly, the air in the hemispherical cover is extracted through the one-way air valve to reduce the heat conduction medium between the hemispherical cover and the optoelectronic module, further improving the working stability of the optoelectronic module after being subjected to electromagnetic pulses.

[0014] In the present invention, the electromagnetic shielding device further comprises nano fire extinguishing capsules, a plurality of nano fire extinguishing capsules are connected to the inner side of the hemispherical shield, the nano fire extinguishing capsules are ruptured by heat and release fire extinguishing gas into the hemispherical shield, and the nano fire extinguishing capsules release fire extinguishing gas by rupturing and absorb heat to cool the shielding net at the same time;

[0015] The hemispherical shield conducts the heat generated by the shielding net after being subjected to the electromagnetic pulse, and the heat causes the nano fire extinguishing capsule to rupture due to heat.

[0016] Through the above technical scheme, after the shielding net is heated up by electromagnetic pulses, the nano fire extinguishing capsule releases fire extinguishing gas and absorbs heat to cool down the inside of the hemispherical shield, thereby protecting the optical module and further improving the protection capability against electromagnetic pulses.

[0017] In the present invention, the electromagnetic shielding device further comprises a thermochromic coating, which is coated on the outer side of the hemispherical shield and changes from a light-transmitting state to an opaque state when heated.

[0018] Through the above technical solution, a thermochromic coating is used. When the hemispherical shield is heated up due to an electromagnetic pulse, the optoelectronic module can be actively shut down when the image collected by the optical module becomes blurred, thereby providing active protection to reduce the direct impact of the electromagnetic pulse on sensitive electronic components. At the same time, the color-changing effect of the thermochromic coating can also reduce the damage of laser weapons to the optical module in the spherical optoelectronic pod.

[0019] In the present invention, the electromagnetic shielding device further comprises a reflector, which is arranged in a ring above the optical module, and the optical module collects the image reflected by the reflector.

[0020] Through the above technical solution, a reflector is used to prevent the optical window of the optical module from directly facing the attack direction of the electromagnetic pulse, further improving the protection performance of the optoelectronic pod against electromagnetic pulses. At the same time, when facing laser weapons, the laser cannot directly hit the optical window, which can also further protect the safety of the optical module.

[0021] In the present invention, the reflective plate is rotatably connected to the optical module, a driving motor is connected to the side of the optical module, and the driving motor is transmission-connected to the reflective plate.

[0022] Through the above technical solution, the rotatable reflector can avoid local damage to the reflector that causes the optical module to be unable to collect image data, improve the automatic recovery capability of the spherical optoelectronic pod after a laser attack, and further improve the endurance of the spherical optoelectronic pod. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 An axonometric diagram of a partial structure of an electromagnetic shielding device in an installed state provided by an embodiment of the present invention;

[0025] Figure 2 A side view of a partial structure of an electromagnetic shielding device in an installed state provided by an embodiment of the present invention;

[0026] Figure 3 for Figure 2 Sectional view at AA;

[0027] Figure 4 for Figure 3 A local enlarged view of point C in FIG.

[0028] Figure 5 for Figure 3 A local enlarged view of point B in FIG.

[0029] Figure 6 for Figure 3 A local enlarged view of point D in FIG.

[0030] Figure 7An axonometric diagram of an electromagnetic shielding device and an optical element provided by an embodiment of the present invention;

[0031] Figure 8 An exploded view of an electromagnetic shielding device and an optical element provided in an embodiment of the present invention.

[0032] Icons: 1-hemispherical shield; 101-shielding net; 102-thermochromic coating; 103-nano fire extinguishing capsule; 2-mounting body; 3-optical module; 301-optical window; 302-ball head; 4-sealing cover; 501-reflector; 502-drive motor; 503-limiting cover; 504-rotating ring; 505-rotating seat; 601-fairing; 602-one-way air valve. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0034] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be welding, bolt connection, or riveting; it can be fixed connection, detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] Example:

[0038] Please refer to Figures 1 to 8 , Figures 1 to 8 An embodiment of the present application is shown.

[0039] This embodiment provides an electromagnetic shielding device, such as Figures 1 to 3 As shown, it includes: an optical module 3, a hemispherical shield 1 and a shielding net 101, the optical module 3 is rotatably connected to the mounting body 2; the hemispherical shield 1 is detachably connected to the mounting body 2, and the hemispherical shield 1 is arranged on the outside of the optical module 3; the shielding net 101 is printed on the inside of the hemispherical shield 1, and the shielding net 101 is light-transmitting and conductive.

[0040] The optical module 3 is a core component in a traditional optoelectronic pod. The hemispherical shield 1 is made of tempered glass. Indium tin oxide is etched into a regular hexagonal grid on the inner side of the tempered glass using a photolithography process to form a shielding net 101. Indium tin oxide is one of the most widely used transparent conductive materials. It has a very high transmittance in the visible light range, usually reaching more than 80%. It also has good conductivity, and the sheet resistance can be as low as tens of ohms per square centimeter.

[0041] When an electromagnetic pulse attacks the spherical optoelectronic pod, the shielding net 101 etched on the inner side of the hemispherical shield 1 generates an induced current to offset the electromagnetic pulse wave. After the offset, the electromagnetic pulse wave is prevented from entering through the optical window 301.

[0042] Through the above technical solution, the hemispherical shield 1 can provide comprehensive protection for the optical module 3. The light-transmitting and conductive shielding net 101 printed on the inner side of the hemispherical shield 1 will not affect the normal operation of the optical module 3 while protecting against electromagnetic pulses, thereby improving the magnetic shielding effect of the spherical optoelectronic pod.

[0043] As a preferred implementation method, Figure 3 and Figure 8 As shown, the shielding net 101 has a plurality of regular hexagonal meshes.

[0044] When etching, the shielding net 101 is denser below the hemispherical shield 1 and gradually becomes sparser as the hemispherical shield 1 approaches the mounting body 2. In this way, the shielding net 101 can provide better electromagnetic shielding performance directly below the hemispherical shield 1 and save the use of indium tin oxide.

[0045] Through the above technical solution, the regular hexagonal mesh has higher space utilization and symmetry. Compared with the square grid, the regular hexagonal grid has a shorter total wire length under the same coverage area (when the grid size and wire thickness are the same), which means that the path for current to pass is shorter, thereby having smaller resistance.

[0046] As a preferred implementation method, Figure 1 and Figure 5As shown, the electromagnetic shielding device also includes a sealing cover 4, a one-way air valve 602 and a fairing 601. The sealing cover 4 is connected to the connection between the optical module 3 and the mounting body 2, and a sealed space is formed between the sealing cover 4 and the hemispherical shield 1; the one-way air valve 602 is plugged into the hemispherical shield 1, and the one-way air valve 602 allows the gas in the hemispherical shield 1 to be discharged outward; the fairing 601 is plugged into the hemispherical shield 1, and the fairing 601 is covered on the outside of the one-way air valve 602.

[0047] During use, after installation is completed, the air in the hemispherical cover 1 is extracted through the one-way air valve 602 to achieve a certain degree of vacuum inside, thereby reducing the gas as a heat transfer medium to transfer heat from the hemispherical cover 1 to the optical module 3.

[0048] Through the above technical solution, a one-way air valve 602 and a sealing cover 4 are used. After assembly, the air in the hemispherical cover 1 is extracted through the one-way air valve 602 to reduce the heat conduction medium between the hemispherical cover 1 and the optoelectronic module, further improving the working stability of the optoelectronic module after being subjected to electromagnetic pulses.

[0049] As a preferred implementation method, Figure 5 and Figure 8 As shown, the electromagnetic shielding device further includes a nano fire extinguishing capsule 103. A plurality of nano fire extinguishing capsules 103 are connected to the inner side of the hemispherical shield 1. After the nano fire extinguishing capsules 103 are ruptured by heat, they release fire extinguishing gas into the hemispherical shield 1. The nano fire extinguishing capsules 103 rupture and release fire extinguishing gas while absorbing heat to cool the shielding net 101. For example, perfluorohexanone, heptafluoropropane or carbon dioxide may be filled therein.

[0050] The above-mentioned hemispherical shield 1 conducts the heat generated by the shielding net 101 after being subjected to the electromagnetic pulse, and the heat causes the nano fire extinguishing capsule 103 to rupture due to heat.

[0051] Through the above technical solution, after the shielding net 101 is heated up by the electromagnetic pulse, the nano fire extinguishing capsule 103 releases the fire extinguishing gas and absorbs the heat to cool down the hemispherical shield 1, thereby protecting the optical module 3, and further improving the protection capability against electromagnetic pulses.

[0052] As a preferred implementation method, Figure 6 As shown, the electromagnetic shielding device further includes a thermochromic coating 102, which is coated on the outer side of the hemispherical cover 1. The thermochromic coating 102 changes from a light-transmitting state to a light-opaque state after being heated.

[0053] When in use, the thermochromic coating 102 is formed by coating with vanadium dioxide. Vanadium dioxide will undergo a reversible transformation from a semiconductor phase to a metal phase at a certain temperature. This transition temperature is usually around 68°C (can be adjusted by doping, etc.). When the temperature is lower than the transition temperature, vanadium dioxide exhibits semiconductor properties, with high resistance and transmittance to infrared rays. In the semiconductor phase, it has a high transmittance to visible light. When the temperature rises above the transition temperature, it quickly transforms into a metal phase, the resistance drops sharply, and the reflectivity to infrared rays increases significantly.

[0054] During use, when the thermochromic coating 102 undergoes a phase change due to heat, the image collected by the optical module 3 becomes blurred. At this time, the operator actively operates or the system automatically compares and identifies and actively cuts off the circuit of the sensitive electronic components in the spherical optoelectronic pod to prevent the electromagnetic pulse from further forming an electric current in the circuit of the sensitive electronic components in the optical module 3 after the shielding net 101 is hot-melted, causing damage to the sensitive electronic components.

[0055] Through the above technical solution, a thermochromic coating 102 is used. When the hemispherical shield 1 is heated up due to an electromagnetic pulse, the optoelectronic module can be actively shut down when the image collected by the optical module 3 becomes blurred, thereby performing active protection to reduce the direct impact of the electromagnetic pulse on sensitive electronic components. At the same time, the color-changing effect of the thermochromic coating 102 can also reduce the damage of laser weapons to the optical module 3 in the spherical optoelectronic pod.

[0056] As a preferred implementation method, Figure 3 and Figure 8 As shown, the electromagnetic shielding device further includes a reflector 501 , which is disposed above the optical module 3 , and the optical module 3 collects images reflected by the reflector 501 .

[0057] When in use, the ball head 302 on the optical module 3 rotates upward, so that the optical window 301 does not face the observation target, but indirectly captures the image through the reflector 501, and then performs distortion correction through software.

[0058] It should be noted that the image processing method does not fall within the scope of protection of the present application. Those skilled in the art can obtain methods for image distortion correction through public technical solutions, which are not specifically described or further limited here. The reflector 501 is made of thin silver-coated glass. After a thin silver film is coated on the surface of the glass, it has a higher reflectivity to visible light. However, when irradiated with high-energy laser, the silver film is destroyed by the high energy of the laser and loses its reflective ability due to its thinness and the difference in thermal expansion coefficient with the glass substrate, thereby protecting the optical module 3.

[0059] Through the above technical solution, a reflector 501 is used to prevent the optical window 301 of the optical module 3 from directly facing the attack direction of the electromagnetic pulse, thereby further improving the protection performance of the optoelectronic pod against electromagnetic pulses. At the same time, when facing laser weapons, the laser cannot directly hit the optical window 301, which can also further protect the safety of the optical module 3.

[0060] As a preferred implementation method, Figure 4 and Figure 8 As shown, the reflector 501 is connected to a rotating ring 504, which is rotatably connected to a rotating seat 505 via a bearing. The rotating seat 505 is sleeved on the outside of the rotating axis of the optical module 3. A limiting cover plate 503 is connected above the rotating seat 505. The rotating seat 505 and the limiting cover plate 503 jointly limit the up and down movement of the rotating ring 504. The driving motor 502 is connected above the limiting cover plate 503, and the driving motor 502 is meshed and driven by the gears and the teeth on the side of the rotating ring 504.

[0061] When the reflector 501 is partially damaged due to the irradiation of the laser weapon, the reflector 501 is rotated by driving the motor 502 so that the reflector 501 in the direction facing the optical window 301 is in a reflective state.

[0062] Through the above technical solution, the rotatable reflector 501 can avoid local damage to the reflector 501 causing the optical module 3 to be unable to collect image data, improve the automatic recovery capability of the spherical optoelectronic pod after being attacked by laser, and further improve the endurance of the spherical optoelectronic pod.

[0063] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An electromagnetic shielding device for protecting an optical module (3), wherein the optical module (3) is rotatably connected to a mounting body (2), characterized in that: include: A hemispherical protective cover (1) is detachably connected to the mounting body (2), the hemispherical protective cover (1) being arranged on the outside of the optical module (3), and the hemispherical protective cover (1) is made of tempered glass; A shielding mesh (101) is printed on the inner side of the hemispherical shield (1), the shielding mesh (101) is light-transmissive and conductive, the shielding mesh (101) has a plurality of regular hexagonal mesh holes, and when etching, the shielding mesh (101) is densely packed below the hemispherical shield (1) and gradually becomes sparse as the hemispherical shield (1) approaches the mounting body (2); A sealing cover (4) connected to a connection point between the optical module (3) and the mounting body (2), wherein a sealed space is formed between the sealing cover (4) and the hemispherical protective cover (1); A one-way air valve (602) is plugged into the hemispherical protective cover (1), and the one-way air valve (602) allows the gas in the hemispherical protective cover (1) to be discharged outwards; A fairing (601) is plugged into the hemispherical protective cover (1), and the fairing (601) is arranged on the outside of the one-way air valve (602); air in the hemispherical protective cover (1) is extracted through the one-way air valve (602) to achieve a certain degree of vacuum inside the hemispherical protective cover, thereby reducing the gas used as a heat transfer medium to transfer heat from the hemispherical protective cover (1) to the optical module (3).

2. The electromagnetic shielding device according to claim 1, characterized in that: Also includes: A plurality of nano fire extinguishing capsules (103) are connected to the inner side of the hemispherical shield (1); the nano fire extinguishing capsules (103) release fire extinguishing gas into the hemispherical shield (1) after being ruptured by heat; and the nano fire extinguishing capsules (103) absorb heat to cool the shielding net (101) while releasing the fire extinguishing gas when ruptured; The hemispherical shield (1) conducts heat generated by the shielding net (101) after being subjected to an electromagnetic pulse, and the heat causes the nano fire extinguishing capsule (103) to rupture due to heat.

3. The electromagnetic shielding device according to claim 2, characterized in that: Also includes: A thermochromic coating (102) is applied on the outer side of the hemispherical cover (1), and the thermochromic coating (102) changes from a light-transmitting state to a light-opaque state when heated.

4. The electromagnetic shielding device according to claim 3, characterized in that: Also includes: The reflective plate (501) is arranged in a ring above the optical module (3), and the optical module (3) collects an image reflected by the reflective plate (501).

5. The electromagnetic shielding device according to claim 4, characterized in that: The reflective plate (501) is rotatably connected to the optical module (3); a driving motor (502) is connected to the side of the optical module (3); and the driving motor (502) is transmission-connected to the reflective plate (501).

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