Laboratory electromagnetic shielding system and method of testing thereof

Abstract

This invention relates to the field of electromagnetic shielding technology, and discloses a laboratory electromagnetic shielding system and its testing method. It solves the technical problem of the difficulty in implementing comprehensive point-by-point fine-grained testing in engineering practice. The system includes a base, a top base, a shielding cage, and a testing device. The shielding cage is rotatably installed between the base and the top base. The shielding cage has a cylindrical structure and includes a supporting frame, a shielding plate, and a shielding layer. The supporting frame includes upper and lower plate frames and a circular arc side frame. The shielding plate is installed inside the upper and lower plate frames and the circular arc side frame, and the shielding layer is installed inside the shielding plate. The testing device includes a transverse slide rail, a longitudinal slide rail, and a testing instrument. The longitudinal slide rail is slidably installed on the transverse slide rail, and the testing instrument is slidably installed on the longitudinal slide rail. Based on the above technical solution, the cylindrical shielding cage designed and constructed according to this invention can achieve efficient, semi / fully automated grid-based point-by-point scanning testing of shielding effectiveness, making comprehensive point-by-point fine-grained testing feasible in engineering practice.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic shielding technology, and more specifically, to an electromagnetic shielding system for laboratory use and its testing methods. Background Technology

[0002] The core of an electromagnetic shielding system is the Faraday cage, which is essentially a metallic shielding cavity. The distribution of electric, magnetic, and radio frequency electromagnetic fields within the cavity is significantly non-uniform, leading to substantial degradation in shielding attenuation performance at the cage's corners, seams, openings, shielding doors, and grounding points. Industry standard acceptance specifications require performance testing using a spatial grid layout and point-by-point scanning method, covering the entire frequency band of signals, including near-field, far-field, power frequency magnetic fields, radio frequency electromagnetic waves, and microwaves.

[0003] In existing projects, Faraday cages are mostly constructed using the existing building structure to create a hexahedral shielding cavity: first, a steel load-bearing frame is erected, and then keels and beams are assembled on the frame to form an overall supporting skeleton. Next, steel shielding plates are fully welded onto the skeleton, forming four side shielding plates, a top plate, and a bottom plate, thus creating a closed hexahedral shielding cage. To enhance the shielding capability against low-frequency magnetic fields, a silicon steel shielding liner is usually added to the inside of the steel shielding plates, completing the main structure of the cage. During construction, structural openings such as shielding door installation positions, ventilation equipment installation holes, and cable threading holes must be pre-reserved. After the main cage structure is completed, shielding accessories such as electromagnetic shielding doors, ventilation waveguide components, and shielded ventilation waveguide windows are then installed.

[0004] While existing hexahedral Faraday cages, once formed, require acceptance standards to use a grid-based point-by-point scanning method to test shielding effectiveness, practical applications have significant drawbacks: the number of test points within the cage is enormous, and the regular hexahedral space makes it difficult to achieve accurate, comprehensive measurement without blind spots. For some applications with high shielding performance requirements, it is necessary to complete full-coverage testing of every point within the cage; however, the existing hexahedral shielding cage structure combined with traditional point-by-point testing methods results in extremely high testing costs and time. If the test determines that the shielding performance is substandard, rework and welding are required to repair defects such as gaps and openings in the cage. After repair, a full-point retest is necessary, and repeated testing significantly increases manpower and time costs, making comprehensive, point-by-point, refined testing difficult to implement in engineering practice. Summary of the Invention

[0005] This invention aims to disclose and protect a laboratory electromagnetic shielding system and its testing method, addressing the technical problem mentioned in the background art that full-area point-by-point fine-grained testing is difficult to implement in engineering practice.

[0006] This invention provides the following technical solution one:

[0007] An electromagnetic shielding system for laboratory use includes a base, a top base, and a shielding cage, wherein the shielding cage is rotatably mounted between the base and the top base;

[0008] The shielding cage has a cylindrical structure;

[0009] The shielding cage includes a supporting frame, a shielding plate, and a shielding layer. The supporting frame includes upper and lower plate frames and an arc-shaped side frame. The shielding plate is installed inside the upper and lower plate frames and the arc-shaped side frame. The shielding layer is installed inside the shielding plate.

[0010] It also includes a detection device, which comprises a transverse slide rail, a longitudinal slide rail, and a detector. The longitudinal slide rail is slidably mounted on the transverse slide rail, and the detector is slidably mounted on the longitudinal slide rail.

[0011] The present invention further specifies that: wherein,

[0012] The base includes a lower disc and a lower rotating shaft. The lower disc is installed on the ground of the building floor, and the lower rotating shaft is rotatably positioned at the center of the top surface of the lower disc.

[0013] The top seat includes an upper disc and an upper rotating shaft. The upper disc is installed on the roof of the building, and the upper rotating shaft is rotatably positioned at the center of the bottom surface of the upper disc.

[0014] The present invention further specifies that: wherein,

[0015] The upper and lower plate frames include a first ring and a crossbeam.

[0016] The arc-shaped side frame includes a second circular ring and longitudinal beams.

[0017] The present invention further specifies that: wherein,

[0018] The shielding plate is made of low carbon steel plate with a thickness of 10mm or 8mm and material Q235B.

[0019] And / or, the first and second rings are made of circular square steel pipes with specifications P50*50 and material Q235B;

[0020] And / or, the crossbeams and longitudinal beams are made of I-beams, specification I18, material Q235B.

[0021] The present invention further specifies that: wherein,

[0022] The length of the longitudinal slide rail is equal to the height of the shielding cage, and the length of the transverse slide rail is equal to the diameter of the shielding cage.

[0023] The present invention provides the following technical solution two:

[0024] A test method for a laboratory electromagnetic shielding system is provided to test the electromagnetic shielding effectiveness of the aforementioned electromagnetic shielding system.

[0025] The present invention further specifies: Method 1: First, a detection device is used to test all detection points in any cylindrical surface of the internal space of the shielding cage, and then the detection device is used to test all detection points in multiple cylindrical surfaces in the transverse direction.

[0026] or,

[0027] Method 2: First, use the detection device to test all the detection points in any circular plane of the internal space of the shielding cage, and then use the detection device to test all the detection points in multiple circular planes in the longitudinal direction.

[0028] The present invention further specifies that: method 1 refers to:

[0029] S1. Drive the shielding cage to rotate;

[0030] S2. Testing is conducted using a detection device inside the shielding cage;

[0031] S2-1. Keep the horizontal coordinate of the detector unchanged, control the shielding cage to perform the first detection point detection at a preset speed, a preset angle, and a preset time; successively rotate the shielding cage at a preset speed, a preset angle, and a preset time to perform the second, third, fourth... first detection point detection to complete a 360° closed-loop test;

[0032] S2-2. Following the steps in S2-1, adjust the vertical coordinate of the detector and perform the complete steps in S2-1 on each vertical coordinate, thereby completing the test of all first detection points within a complete cylindrical surface.

[0033] S2-3. Based on the detection methods in S2-1 and S2-2, each time the horizontal coordinate of the detector is adjusted, the complete detection methods in S2-1 and S2-2 are executed to achieve the testing of all detection points within the cylindrical space of the shielding cage.

[0034] The present invention further specifies that: method 2 refers to:

[0035] S1. Drive the shielding cage to rotate;

[0036] S2. Testing is conducted using a detection device inside the shielding cage;

[0037] S2-1. Keep the vertical coordinate of the detector unchanged, control the shielding cage to perform the second detection point detection at a preset speed, rotate at a preset angle and stop for a preset time; successively rotate the shielding cage at a preset speed, rotate at a preset angle and stop for a preset time to perform the second, third, fourth... second detection point detection to complete a 360° closed loop test;

[0038] S2-2. Following the steps in S2-1, adjust the horizontal coordinate of the detector and perform the complete steps in S2-1 on each horizontal coordinate, thereby completing the test of all second detection points within a complete circular plane.

[0039] S2-3. Based on the detection methods in S2-1 and S2-2, each time the vertical coordinate of the detector is adjusted, the complete detection methods in S2-1 and S2-2 are executed to achieve the testing of all detection points within the cylindrical space of the shielding cage.

[0040] The present invention further specifies that: the shielding cage is kept stationary while the detection device is controlled to rotate within the shielding cage along the central axis of the shielding cage.

[0041] In summary, the present invention has the following beneficial effects:

[0042] (1) Designing and constructing the Faraday cage as a cylindrical shielding cage can achieve efficient, semi / fully automated grid layout and point-by-point scanning detection of shielding effectiveness, making full-area point-by-point fine detection possible in engineering practice;

[0043] (2) The square cavity of the hexahedral shielding cage has a right-angle abrupt structure at the four corners. When electromagnetic waves are incident inside the cavity, the electric field will accumulate at the right-angle corners, causing a sharp increase in the local induced charge density. Electromagnetic leakage is very likely to occur at the cavity gaps and welded joints. In contrast, the cylindrical shielding cage is a continuous and smooth curved surface with no abrupt change in surface curvature. The induced charge on the cavity surface can be evenly distributed, and there are no areas of electric field distortion or field strength concentration. Under the premise of the same gap structure and size, the leakage is much lower than that of the hexahedral structure.

[0044] (3) The cylindrical cavity has a more uniform reflection effect on electromagnetic waves, which can effectively suppress cavity resonance problems. Metal shielded cavities generally have cavity resonance phenomena, which will greatly deteriorate the shielding effectiveness under resonance state. Compared with the hexahedral structure, the cylindrical structure can weaken the resonance peak due to its uniform electromagnetic wave reflection characteristics, broaden the effective operating frequency band with low shielding attenuation, and further improve the overall electromagnetic shielding performance. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0046] Figure 1 Schematic diagram of the electromagnetic shielding system framework Figure 1 ;

[0047] Figure 2 Schematic diagram of the electromagnetic shielding system framework Figure 2 ;

[0048] Figure 3 This is a schematic diagram of the three-dimensional structure of the detection device.

[0049] Reference numerals in the attached drawings: 1. Base; 1-1. Lower disc; 1-2. Lower pivot; 2. Top seat; 2-1. Upper disc; 2-2. Upper pivot; 3. Shielding cage; 3-1. Support frame; 3-11. Upper and lower plate frames; 3-111. First ring; 3-112. Crossbeam; 3-12. Arc side frame; 3-121. Second ring; 3-122. Longitudinal beam; 4. Detection device; 4-1. Transverse slide rail; 4-2. Longitudinal slide rail; 4-3. Detector. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0051] An electromagnetic shielding system for laboratory use, combined with Figure 1 and Figure 2 As shown, the structure includes a base 1, a top mount 2, and a shielding cage 3. The base 1 is installed on the ground of the building floor, the top mount 2 is installed on the roof of the building floor, and the shielding cage 3 is installed between the base 1 and the top mount 2. In this invention, the shielding cage 3 is not a conventional hexahedral shape, but is constructed into a cylindrical shape.

[0052] Before providing a detailed explanation of the structural design, construction structure, and construction details of the base 1, top seat 2, and shielding cage 3, this invention will first explain the design principles of the cylindrical shielding cage 3's shape and structure, as well as the corresponding testing methods for the shielding cage 3.

[0053] This invention constructs the shielding cage 3 into a cylindrical shape, thus forming a cylindrical laboratory space inside the shielding cage 3. Analyzing the structural morphology of the shielding cage 3 alone, the cylindrical shielding cage 3 exhibits significant performance advantages compared to the conventional hexahedral shielding cage. The cylindrical shielding cage has no right angles or sharp, abrupt structural changes on its outer surface, which can eliminate electric field tip discharge phenomena at the source and avoid electromagnetic leakage problems caused by localized electric field intensity accumulation.

[0054] The specific principle is as follows: The square cavity of the hexahedral shielding cage has a right-angle abrupt structure at its four corners. When electromagnetic waves are incident inside the cavity, the electric field will accumulate at the right-angle corners, causing a sharp increase in the local induced charge density. Electromagnetic leakage is very likely to occur at the cavity gaps and welded joints. In contrast, the cylindrical shielding cage has a continuous and smooth curved surface with no abrupt changes in surface curvature. The induced charge on the cavity surface can be evenly distributed, and there are no areas of electric field distortion or concentrated field strength. Under the premise of the same gap structure and size, the leakage is much lower than that of the hexahedral structure.

[0055] In addition, cylindrical cavities offer more uniform electromagnetic wave reflection, effectively suppressing cavity resonance. Metal shielding cavities commonly exhibit cavity resonance, which significantly degrades shielding effectiveness. Compared to hexahedral structures, cylindrical structures, with their uniform electromagnetic wave reflection characteristics, can weaken resonance peaks, broaden the effective operating frequency band with low shielding attenuation, and further improve overall electromagnetic shielding performance.

[0056] Therefore, it can be seen that the cylindrical shielding cage 3 not only has no impact on performance compared to the conventional hexahedral shielding cage, but also has some performance advantages. Based on this theory, it is therefore possible to consider modifying the conventional hexahedral shielding cage into a cylindrical shielding cage 3.

[0057] The reason why our company designed and constructed it as a cylindrical shielding cage is that it can achieve efficient, semi / fully automated grid layout and point-by-point scanning detection of shielding effectiveness, so that full-area point-by-point fine detection can be implemented in engineering practice.

[0058] The specific testing method is as follows:

[0059] S1, drive the cylindrical shielding cage 3 to rotate.

[0060] An external drive device is used to drive the shielding cage 3 to rotate along the base 1 and top seat 2 at a preset speed. The rotation speed is preset according to the test requirements. It should be noted that, since the shielding effectiveness needs to be tested during rotation, the shielding cage 3 does not rotate continuously, but intermittently. After rotating at a preset speed and a preset angle (e.g., 2°), it stops for a preset time, then rotates at the preset speed and a preset angle again and stops for a preset time, until a 360° full-angle test is completed.

[0061] The preset rotation angle can be set to different preset angles depending on the distance between the detection position and the central axis of the cylindrical shielding cage 3. The closer to the central axis, the larger the preset angle; the closer to the inner wall of the shielding cage 3, the smaller the preset angle.

[0062] The drive unit can be directly integrated into the base 1, or into the top mount 2, or neither can be integrated into the base 1 or the top mount 2. Instead, an external drive unit is used to drive the shielding cage 3 for testing, and the settings are configured according to actual construction needs and practices. In this manual, it is sufficient that the shielding cage 3 can rotate at a preset speed and angle and then stop for a preset time.

[0063] S2. The shielding effectiveness is tested efficiently and semi / fully automatically using a testing device 4 inside the cylindrical shielding cage 3.

[0064] First, it should be noted that the detection device 4 is completely unrelated to the electromagnetic shielding system of the present invention. However, since the electromagnetic shielding system of the present invention can more conveniently achieve efficient, semi / fully automated shielding effectiveness testing with the help of the detection device 4, the structural design of the detection device 4 is described in this specification to facilitate a better understanding of the cylindrical design principle of the shielding cage 3 of the present invention.

[0065] Reference Figure 3 As shown, the detection device 4 includes a transverse slide rail 4-1, a longitudinal slide rail 4-2, and a detector 4-3. The longitudinal slide rail 4-2 is slidably mounted on the transverse slide rail 4-1. The length of the longitudinal slide rail 4-2 is set to be equal to the height of the cylindrical shielding cage 3, and the length of the transverse slide rail 4-1 is set to be equal to the diameter of the cylindrical shielding cage 3. The detector 4-3 is slidably mounted on the longitudinal slide rail 4-2. The detector 4-3 is configured as a power frequency magnetic field detector (such as WT10A or Narda ELT400) or a spectrum analyzer, etc., as required by existing technology. The detector 4-3 is adjusted, selected, and installed according to the object to be detected.

[0066] It should be noted that the horizontal slide rail 4-1 has M first detection points set according to a preset setting, with a first preset distance between adjacent first detection points. The vertical slide rail 4-2 has N second detection points set according to a preset setting, with a second preset distance between adjacent second detection points. Therefore, the coordinates of the detector 4-3 in the plane where the detection device 4 is located are (m, n), and one position coordinate of the detector 4-3 is also one detection point.

[0067] In step 2, the specific steps for conducting efficient, semi / fully automated shielding effectiveness testing are as follows:

[0068] S2-1. The horizontal coordinate of the fixed detector 4-3 remains unchanged, that is, the position of the detector 4-3 at the first detection point remains unchanged, that is, the horizontal coordinate m remains unchanged. At this time, the control shield cage 3 is rotated at a preset speed, rotated at a preset angle and stopped for a preset time to detect the first detection point; the shield cage 3 is rotated successively at a preset speed, rotated at a preset angle and stopped for a preset time to detect the second, third, fourth... first detection points, so as to complete a 360° closed loop test;

[0069] S2-2. Following the steps in S2-1, adjust the vertical coordinate of the detector 4-3, and perform the complete steps in S2-1 on each vertical coordinate, so as to complete the test of all the first detection points in a complete cylindrical surface.

[0070] S2-3. Based on the detection methods of S2-1 and S2-2, each time the horizontal coordinate of the detector 4-3 is adjusted, the complete detection methods of S2-1 and S2-2 are executed, thereby achieving the testing of all detection points within the cylindrical space of the shielding cage 3.

[0071] Alternatively, in step 2, the specific steps for conducting efficient, semi / fully automated shielding effectiveness testing are as follows:

[0072] S2-1. The vertical coordinate of the fixed detector 4-3 remains unchanged, that is, the position of the detector 4-3 at the second detection point remains unchanged, that is, the vertical coordinate n remains unchanged. At this time, the control shield cage 3 is rotated at a preset speed, rotated at a preset angle and stopped for a preset time to perform the detection of the second detection point; the shield cage 3 is rotated successively at a preset speed, rotated at a preset angle and stopped for a preset time to perform the detection of the second, third, fourth... second detection points to complete a 360° closed loop test;

[0073] S2-2. Following the steps in S2-1, adjust the horizontal coordinate of the detector 4-3, and perform the complete steps in S2-1 on each horizontal coordinate, so as to complete the test of all the second detection points in a complete circular plane.

[0074] S2-3. Based on the detection methods of S2-1 and S2-2, each time the vertical coordinate of the detector 4-3 is adjusted, the complete detection methods of S2-1 and S2-2 are executed, thereby realizing the testing of all detection points in the cylindrical space of the shielding cage 3.

[0075] It should be noted that, in another embodiment, the shielding cage 3 is kept stationary while the detection device 4 is controlled to rotate.

[0076] Based on the above testing approach, in general, the testing device 4 is used to test all the testing points within one cylindrical surface of the internal space of the cylindrical shielding cage 3, and then all the testing points within multiple cylindrical surfaces in the horizontal direction are tested.

[0077] Alternatively, the detection device 4 can be used to test all the detection points in a circular plane within the internal space of the cylindrical shielding cage 3, and then all the detection points in multiple circular planes along the longitudinal direction can be tested.

[0078] Based on the above explanation, it is clear that the significance of designing the shielding cage 3 into a cylindrical shape in this invention is evident. At the same time, it is clear how to efficiently and semi / fully automatically scan and detect the shielding effectiveness of the internal space of the cylindrical shielding cage 3 by grid layout after designing the shielding cage 3 into a cylindrical shape, so that the full-area point-by-point fine detection can be implemented in engineering practice.

[0079] The following section provides a detailed description of the structure of the electromagnetic shielding system, which includes a base 1, a top base 2, and a shielding cage 3.

[0080] The base 1 includes a lower disc 1-1 and a lower rotating shaft 1-2. The lower disc 1-1 is installed on the ground of the building floor, and the lower rotating shaft 1-2 is rotatably positioned at the center of the top surface of the lower disc 1-1.

[0081] The top seat 2 includes an upper disc 2-1 and an upper rotating shaft 2-2. The upper disc 2-1 is installed on the roof of the building floor, and the upper rotating shaft 2-2 is rotatably positioned at the center of the bottom surface of the upper disc 2-1.

[0082] The shielding cage 3 includes a supporting frame 3-1, a shielding plate, and a shielding layer. The supporting frame 3-1 includes upper and lower plate frames 3-11 and an arc-shaped side frame 3-12. The upper and lower plate frames 3-11 include a first circular ring 3-111 and a crossbeam 3-112. The arc-shaped side frame 3-12 includes a second circular ring 3-121 and a longitudinal beam 3-122. The shielding plate is installed inside the upper and lower plate frames 3-11 and the arc-shaped side frame 3-12, and the shielding layer is installed inside the shielding plate.

[0083] The shielding plate is made of low-carbon steel plate with a thickness of 10mm or 8mm and material Q235B.

[0084] The first ring 3-111 and the second ring 3-121 are made of circular square steel pipe with specifications of P50*50 and material of Q235B.

[0085] The crossbeams 3-112 and longitudinal beams 3-122 are made of I-beams, with a specification of I18 and a material of Q235B.

[0086] After the shielding cage 3 completes the shielding effectiveness test, it is fixed to the building floor structure on the outside of the support frame 3-1 (i.e., the outside of the upper and lower plate frames 3-11 and the arc side frame 3-12) to restrict the rotation of the shielding cage 3. The exterior decoration of the shielding cage 3 is then completed as needed. At the same time, after the shielding cage 3 is fixed to the floor from the outside, the interior decoration of the shielding cage 3 can be completed simultaneously.

[0087] When the shielding effectiveness of the shielding cage 3 is compromised, or when it is necessary to improve the shielding effectiveness, the decoration can be removed and the restrictions on the rotation of the shielding cage 3 can be lifted, and the structure of the shielding cage 3 can be modified.

[0088] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An electromagnetic shielding system for laboratory use, characterized in that, It includes a base, a top base, and a shielding cage, wherein the shielding cage is rotatably installed between the base and the top base; The shielding cage has a cylindrical structure; The shielding cage includes a supporting frame, a shielding plate, and a shielding layer. The supporting frame includes upper and lower plate frames and an arc-shaped side frame. The shielding plate is installed inside the upper and lower plate frames and the arc-shaped side frame. The shielding layer is installed inside the shielding plate. It also includes a detection device, which comprises a transverse slide rail, a longitudinal slide rail, and a detector. The longitudinal slide rail is slidably mounted on the transverse slide rail, and the detector is slidably mounted on the longitudinal slide rail.

2. The electromagnetic shielding system for laboratory use according to claim 1, characterized in that, in, The base includes a lower disc and a lower rotating shaft. The lower disc is installed on the ground of the building floor, and the lower rotating shaft is rotatably positioned at the center of the top surface of the lower disc. The top seat includes an upper disc and an upper rotating shaft. The upper disc is installed on the roof of the building, and the upper rotating shaft is rotatably positioned at the center of the bottom surface of the upper disc.

3. The electromagnetic shielding system for laboratory use according to claim 1, characterized in that, in, The upper and lower plate frames include a first ring and a crossbeam. The arc-shaped side frame includes a second circular ring and longitudinal beams.

4. The electromagnetic shielding system for laboratory use according to claim 3, characterized in that, in, The shielding plate is made of low carbon steel plate with a thickness of 10mm or 8mm and material Q235B. And / or, the first and second rings are made of circular square steel pipes with specifications P50*50 and material Q235B; And / or, the crossbeams and longitudinal beams are made of I-beams, specification I18, material Q235B.

5. The electromagnetic shielding system for laboratory use according to claim 1, characterized in that, in, The length of the longitudinal slide rail is equal to the height of the shielding cage, and the length of the transverse slide rail is equal to the diameter of the shielding cage.

6. A test method for a laboratory electromagnetic shielding system, characterized in that, The electromagnetic shielding effectiveness of the electromagnetic shielding system according to any one of claims 1-5 was tested.

7. The test method according to claim 6, characterized in that, Including the following methods: Method 1: First, use the detection device to test all detection points in any cylindrical surface of the internal space of the shielding cage, and then use the detection device to test all detection points in multiple cylindrical surfaces in the horizontal direction. or, Method 2: First, use the detection device to test all the detection points in any circular plane of the internal space of the shielding cage, and then use the detection device to test all the detection points in multiple circular planes in the longitudinal direction.

8. The test method according to claim 7, characterized in that, Method 1 refers to: S1. Drive the shielding cage to rotate; S2. Testing is conducted using a detection device inside the shielding cage; S2-1. Keep the horizontal coordinate of the detector unchanged, control the shielding cage to perform the first detection point detection at a preset speed, a preset angle, and a preset time; successively rotate the shielding cage at a preset speed, a preset angle, and a preset time to perform the second, third, fourth... first detection point detection to complete a 360° closed-loop test; S2-2. Following the steps in S2-1, adjust the vertical coordinate of the detector and perform the complete steps in S2-1 on each vertical coordinate, thereby completing the test of all first detection points within a complete cylindrical surface. S2-3. Based on the detection methods in S2-1 and S2-2, each time the horizontal coordinate of the detector is adjusted, the complete detection methods in S2-1 and S2-2 are executed to achieve the testing of all detection points within the cylindrical space of the shielding cage.

9. The test method according to claim 7, characterized in that, Method 2 refers to: S1. Drive the shielding cage to rotate; S2. Testing is conducted using a detection device inside the shielding cage; S2-1. Keep the vertical coordinate of the detector unchanged, control the shielding cage to perform the second detection point detection at a preset speed, rotate at a preset angle and stop for a preset time; successively rotate the shielding cage at a preset speed, rotate at a preset angle and stop for a preset time to perform the second, third, fourth... second detection point detection to complete a 360° closed loop test; S2-2. Following the steps in S2-1, adjust the horizontal coordinate of the detector and perform the complete steps in S2-1 on each horizontal coordinate, thereby completing the test of all second detection points within a complete circular plane. S2-3. Based on the detection methods in S2-1 and S2-2, each time the vertical coordinate of the detector is adjusted, the complete detection methods in S2-1 and S2-2 are executed to achieve the testing of all detection points within the cylindrical space of the shielding cage.

10. The test method according to any one of claims 6-9, characterized in that, Keeping the shielding cage stationary, control the detection device to rotate within the shielding cage along its central axis.

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