Detection device and detection system

Abstract

The embodiment of the utility model discloses a detection device and a detection system, in the detection device, an electromagnetic shielding structure covers the inner wall of a box body; a signal source of the signal generation assembly is arranged outside the box body, a first electric connector penetrates through the box body, a radio frequency antenna is obliquely arranged in the box body, a parabolic reflector is arranged in the box body, and the radio frequency antenna is located below the parabolic reflector; a test fixture of the signal detection assembly is arranged in the box body, the test fixture is located in a focusing area below the parabolic reflector, a radio frequency signal receiver is arranged on the test fixture, the test fixture is used for mounting an object to be detected so as to cover the radio frequency signal receiver, a second electric connector penetrates through the box body, and a spectrum analyzer is arranged outside the box body. Through the above mode, the radio frequency antenna of the embodiment of the utility model obliquely radiates to the parabolic reflector, so that electromagnetic waves are focused and radiated to the test fixture, the electromagnetic field intensity of the test fixture area is enhanced, errors are reduced, and the accuracy of electromagnetic shielding effectiveness detection is improved.

Description

A detection device and detection system Technical Field

[0001] This utility model relates to the field of detection technology, and in particular to a detection device and detection system. Background Technology

[0002] With the development of science and technology, electronic components are becoming smaller, more compact, and more integrated. This makes them more susceptible to electromagnetic interference, affecting their normal operation. To reduce electromagnetic interference between components, electromagnetic shielding covers are typically used to cover them and provide electromagnetic shielding.

[0003] Electromagnetic shielding covers need to have their electromagnetic shielding effectiveness evaluated through electromagnetic shielding effectiveness testing. Currently, the commonly used shielding room window method is only suitable for large equipment. When the shielding room window method is used to test the electromagnetic shielding effectiveness of small equipment (such as small electromagnetic shielding covers), the error is relatively large, which can easily reduce the accuracy of electromagnetic shielding effectiveness testing. Therefore, there is an urgent need for an electromagnetic shielding effectiveness testing device suitable for small electromagnetic shielding covers. Summary of the Invention

[0004] The present invention aims to provide a detection device and detection system that can reduce errors and improve the accuracy of electromagnetic shielding effectiveness detection.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this utility model embodiment is: providing a detection device, including a housing, an electromagnetic shielding structure, a signal generating component, and a signal detection component; the electromagnetic shielding structure covers the inner wall of the housing; the signal generating component includes a signal source, a first electrical connector, a radio frequency antenna, and a parabolic reflector, the signal source being disposed outside the housing, the first electrical connector passing through the housing, the radio frequency antenna being obliquely disposed inside the housing, the parabolic reflector being disposed inside the housing, the radio frequency antenna being located below the parabolic reflector, one end of the first electrical connector being electrically connected to the signal source outside the housing, and the first electrical connector... The other end of the connector is electrically connected to the radio frequency antenna inside the housing; the signal detection assembly includes a test fixture, a radio frequency signal receiver, a second electrical connector, and a spectrum analyzer. The test fixture is disposed inside the housing and is located in the focusing area below the parabolic reflector. The radio frequency signal receiver is disposed on the test fixture and is used for mounting the object under test to cover the radio frequency signal receiver. The second electrical connector passes through the housing, and the spectrum analyzer is disposed outside the housing. One end of the second electrical connector is electrically connected to the radio frequency signal receiver inside the housing, and the other end of the second electrical connector is electrically connected to the spectrum analyzer outside the housing.

[0006] Optionally, the shielding effectiveness of the object under test is defined as S. When the test fixture is not equipped with the object under test, the radio frequency signal strength detected by the spectrum analyzer is defined as S1. When the test fixture is equipped with the object under test, the radio frequency signal strength detected by the spectrum analyzer is defined as S2, where S = S1 - S2.

[0007] Optionally, it also includes a universal bracket, which is disposed on the inner side wall of the housing. The universal bracket is detachably connected to the radio frequency antenna and is used for mounting the radio frequency antenna and adjusting the tilt angle of the radio frequency antenna.

[0008] Optionally, the universal bracket includes a first rod and a second rod. One end of the first rod is fixed to the inner side wall of the housing, and the other end of the first rod is hinged to the second rod. The end of the second rod away from the first rod is detachably connected to the radio frequency antenna.

[0009] Optionally, it also includes a first screw connector, which passes through the radio frequency antenna and is screwed to the end of the second rod away from the first rod, so that the end of the second rod away from the first rod is detachably connected to the radio frequency antenna.

[0010] Optionally, a fixing bracket is also included, which is disposed on the inner top wall of the housing and is detachably connected to the parabolic reflector.

[0011] Optionally, a second screw connector is also included, which passes through the parabolic reflector and is screwed onto the fixed bracket, so that the fixed bracket and the parabolic reflector are detachably connected.

[0012] Optionally, the enclosure includes a main body and a door. The main body has a receiving cavity and an opening. The receiving cavity communicates with the opening. The receiving cavity is used to receive the radio frequency antenna, parabolic reflector, test fixture and radio frequency signal receiver. The opening is used to allow the object under test to enter and exit the receiving cavity. The door is used to cover the opening.

[0013] Optionally, the electromagnetic shielding structure includes a first absorbing foam covering the inner wall of the enclosure body, which is used to shield electromagnetic waves emitted by the radio frequency antenna from penetrating the enclosure to the external environment; and / or, the electromagnetic shielding structure includes a second absorbing foam covering the side of the door facing the enclosure body, which is used to shield electromagnetic waves emitted by the radio frequency antenna from penetrating the door to the external environment; and / or, the electromagnetic shielding structure includes a third absorbing foam surrounding the periphery of the door, which seals the gap between the enclosure body and the door, and is used to shield electromagnetic waves emitted by the radio frequency antenna from leaking from the gap between the enclosure body and the door to the external environment.

[0014] To solve the above-mentioned technical problems, another technical solution adopted in this utility model embodiment is to provide a detection system, including the above-mentioned detection device.

[0015] The beneficial effects of this utility model embodiment are as follows: Unlike the prior art, this utility model embodiment provides a detection device, including a housing, an electromagnetic shielding structure, a signal generating component, and a signal detection component; the electromagnetic shielding structure covers the inner wall of the housing; the signal generating component includes a signal source, a first electrical connector, a radio frequency antenna, and a parabolic reflector; the signal source is disposed outside the housing, the first electrical connector passes through the housing, the radio frequency antenna is obliquely disposed inside the housing, the parabolic reflector is disposed inside the housing, the radio frequency antenna is located below the parabolic reflector, and one end of the first electrical connector is connected to the signal source outside the housing. The connection includes a first electrical connector, the other end of which is electrically connected to the radio frequency antenna inside the housing; the signal detection component includes a test fixture, a radio frequency signal receiver, a second electrical connector, and a spectrum analyzer. The test fixture is located inside the housing and in the focusing area below the parabolic reflector. The radio frequency signal receiver is located in the test fixture and is used for mounting the object under test to cover the radio frequency signal receiver. The second electrical connector passes through the housing, and the spectrum analyzer is located outside the housing. One end of the second electrical connector is electrically connected to the radio frequency signal receiver inside the housing, and the other end of the second electrical connector is electrically connected to the spectrum analyzer outside the housing.

[0016] In the above-described manner, the radio frequency antenna in this embodiment of the invention is tilted to radiate to the parabolic reflector, so that the spherical wave generated by the radio frequency antenna is converted into a plane wave by the parabolic reflector and focused onto the test fixture. This reduces the scattering and diffraction of the electromagnetic field during the radiation process, enhances the electromagnetic field strength in the test fixture area, reduces errors, and improves the accuracy of electromagnetic shielding effectiveness testing. It is especially suitable for electromagnetic shielding effectiveness testing of small objects under test. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of this utility model or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0018] Figure 1 is a schematic diagram of the overall structure of the detection device provided in an embodiment of this utility model;

[0019] Figure 2 is a partial structural schematic diagram of the detection device provided in an embodiment of this utility model;

[0020] Figure 3 is a partial structural schematic diagram of the detection device provided in an embodiment of this utility model;

[0021] Figure 4 is a schematic diagram of the overall structure of the detection device provided in this embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Box body; 11. Box main body; 12. Door body;

[0024] 2. Electromagnetic shielding structure; 21. First wave-absorbing foam;

[0025] 3. Signal generating component; 31. Signal source; 32. First electrical connector; 33. Radio frequency antenna; 34. Parabolic reflector;

[0026] 4 Signal detection components, 41 Test fixture, 42 Radio frequency signal receiver, 43 Second electrical connector, 44 Spectrum analyzer;

[0027] 5. Universal bracket, 51. First rod, 52. Second rod;

[0028] 6. Fixed brackets;

[0029] 100 detection device. Detailed Implementation

[0030] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "vertical," "horizontal," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0032] With the development of science and technology, electronic components are becoming smaller, more compact, and more integrated. This makes them more susceptible to electromagnetic interference, affecting their normal operation. To reduce electromagnetic interference between components, electromagnetic shielding covers are typically used to cover them and provide electromagnetic shielding.

[0033] Electromagnetic shielding covers need to have their electromagnetic shielding effectiveness evaluated through electromagnetic shielding effectiveness testing. Currently, the commonly used shielding room window method is only suitable for large equipment. When the shielding room window method is used to test the electromagnetic shielding effectiveness of small equipment (such as small electromagnetic shielding covers), the error is relatively large, which can easily reduce the accuracy of electromagnetic shielding effectiveness testing. Therefore, there is an urgent need for an electromagnetic shielding effectiveness testing device suitable for small electromagnetic shielding covers.

[0034] In view of this, the present invention provides an embodiment of a detection device 100, which can reduce errors and improve the accuracy of electromagnetic shielding effectiveness detection, and is especially suitable for electromagnetic shielding effectiveness detection of small objects to be tested.

[0035] To facilitate the reader's understanding of the concept of this utility model embodiment, the specific structure of the testing device is described below:

[0036] Please refer to Figures 1 to 4. The detection device 100 includes a housing 1, an electromagnetic shielding structure 2, a signal generating component 3, and a signal detection component 4. The electromagnetic shielding structure 2 covers the inner wall of the housing 1. The signal generating component 3 includes a signal source 31, a first electrical connector 32, a radio frequency antenna 33, and a parabolic reflector 34. The signal source 31 is located outside the housing 1, the first electrical connector 32 passes through the housing 1, the radio frequency antenna 33 is obliquely disposed inside the housing 1, and the parabolic reflector 34 is disposed inside the housing 1, with the radio frequency antenna 33 located below the parabolic reflector 34. One end of the first electrical connector 32 is electrically connected to the signal source 31 outside the housing 1, and the other end of the first electrical connector 32 is located inside the housing 1. The signal detection component 4 includes a test fixture 41, an RF signal receiver 42, a second electrical connector 43, and a spectrum analyzer 44. The test fixture 41 is located inside the housing 1 and is situated in the focusing area below the parabolic reflector 34. The RF signal receiver 42 is mounted on the test fixture 41 and is used for mounting the object under test to cover the RF signal receiver 42. The second electrical connector 43 passes through the housing 1, and the spectrum analyzer 44 is located outside the housing 1. One end of the second electrical connector 43 is electrically connected to the RF signal receiver 42 inside the housing 1, and the other end of the second electrical connector 43 is electrically connected to the spectrum analyzer 44 outside the housing 1.

[0037] In the above manner, the radio frequency antenna 33 in this embodiment of the present invention is tilted to radiate to the parabolic reflector 34, so that the spherical wave generated by the radio frequency antenna 33 is converted into a plane wave by the parabolic reflector 34 and focused to radiate to the test fixture 41. This reduces the scattering and diffraction of the electromagnetic field during the radiation process, enhances the electromagnetic field strength in the area of ​​the test fixture 41, reduces errors, and improves the accuracy of electromagnetic shielding effectiveness testing. It is especially suitable for electromagnetic shielding effectiveness testing of small objects under test.

[0038] For the aforementioned testing device 100, the shielding effectiveness of the object under test is defined as S. When the test fixture 41 is not equipped with the object under test, the radio frequency signal strength detected by the spectrum analyzer 44 is defined as S1. When the test fixture 41 is equipped with the object under test, the radio frequency signal strength detected by the spectrum analyzer 44 is defined as S2. Therefore, S = S1 - S2. This method provides a way to quantify electromagnetic shielding effectiveness, facilitating a direct and intuitive assessment of the electromagnetic shielding effectiveness of the object under test.

[0039] The aforementioned testing device 100, as shown in Figures 2 to 4, also includes a universal bracket 5. The universal bracket 5 is disposed on the inner wall of the housing 1 and is detachably connected to the radio frequency antenna 33. The universal bracket 5 is used to mount the radio frequency antenna 33 and adjust its tilt angle. In this manner, the universal bracket 5 facilitates the adjustment of the radio frequency antenna 33's tilt angle to accommodate the varying electromagnetic field strength required for testing the electromagnetic shielding effectiveness of objects of different shapes. Furthermore, the detachable connection between the universal bracket 5 and the radio frequency antenna 33 allows for quick assembly and disassembly of the antenna, facilitating its maintenance, replacement, and cleaning.

[0040] In some embodiments, referring to Figures 2 to 4, the universal bracket 5 includes a first rod 51 and a second rod 52. One end of the first rod 51 is fixed to the inner wall of the housing 1, and the other end of the first rod 51 is hinged to the second rod 52. The end of the second rod 52 away from the first rod 51 is detachably connected to the radio frequency antenna 33. Through this method, the hinged universal bracket 5 can improve the structural strength and adjustment freedom of the universal bracket 5, so that the radio frequency antenna 33 has a wider angle adjustment range. The fixing method of the first rod 51 to the housing 1 includes, but is not limited to, welding, bonding, screwing, snap-fitting, and plugging connections. The detachable connection method of the second rod 52 to the radio frequency antenna 33 includes, but is not limited to, screwing, snap-fitting, or magnetic connection methods.

[0041] In some embodiments, please refer to Figures 2 to 4. The detection device 100 further includes a first screw connector, which passes through the radio frequency antenna 33 and is screwed to the end of the second rod 52 away from the first rod 51, so that the end of the second rod 52 away from the first rod 51 is detachably connected to the radio frequency antenna 33.

[0042] The aforementioned detection device 100, as shown in Figures 2 to 4, also includes a fixing bracket 6. The fixing bracket 6 is disposed on the inner top wall of the housing 1 and is detachably connected to the parabolic reflector 34. In this manner, the fixing bracket 6 provides a preset installation position for the parabolic reflector 34, ensuring precise positioning of the reflector 34 within the housing 1 and preventing misalignment that could lead to incorrect electromagnetic wave reflection. Furthermore, the detachable connection between the fixing bracket 6 and the parabolic reflector 34 allows for quick assembly and disassembly, facilitating maintenance, replacement, and cleaning. The fixing methods of the fixing bracket 6 and the housing 1 include, but are not limited to, welding, bonding, screwing, snap-fitting, and plugging. The detachable connection methods of the fixing bracket 6 and the parabolic reflector 34 include, but are not limited to, screwing, snap-fitting, or magnetic connection.

[0043] In some embodiments, referring to Figures 2 to 4, the detection device 100 further includes a second screw connector, which passes through the parabolic reflector 34 and is screwed to the fixed bracket 6, so that the fixed bracket 6 and the parabolic reflector 34 are detachably connected.

[0044] In some embodiments, please refer to Figures 1 to 4. The housing 1 includes a housing body 11 and a door 12. The housing body 11 is provided with a receiving cavity and an opening. The receiving cavity is connected to the opening. The receiving cavity is used to receive the radio frequency antenna 33, the parabolic reflector 34, the test fixture 41 and the radio frequency signal receiver 42. The opening is used to allow the object under test to enter and exit the receiving cavity. The door 12 is used to cover the opening.

[0045] In some embodiments of the electromagnetic shielding structure 2 described above, as shown in Figures 2 to 4, the electromagnetic shielding structure 2 includes a first absorbing foam 21. The first absorbing foam 21 covers the inner wall of the housing body 11 and is used to shield electromagnetic waves emitted by the radio frequency antenna 33 from penetrating the housing 1 to the external environment. This method reduces the amount of electromagnetic waves radiated from the housing body 11 to the external environment, improving the accuracy and reliability of the test data.

[0046] And / or, for the electromagnetic shielding structure 2 described above, in some embodiments, as shown in Figures 2 to 4, the electromagnetic shielding structure 2 includes a second absorbing foam (not shown). The second absorbing foam covers the side of the door 12 facing the main body 11 of the enclosure. The second absorbing foam is used to shield electromagnetic waves emitted by the radio frequency antenna 33 from penetrating the door 12 to the external environment. In this way, the radiation of electromagnetic waves from the door 12 to the external environment can be reduced, further improving the accuracy and reliability of the test data.

[0047] And / or, for the electromagnetic shielding structure 2 described above, in some embodiments, as shown in Figures 2 to 4, the electromagnetic shielding structure 2 includes a third absorbing foam (not shown). The third absorbing foam is arranged around the periphery of the door 12, sealing the gap between the main body 11 and the door 12. The third absorbing foam is used to shield electromagnetic waves emitted by the radio frequency antenna 33 from leaking into the external environment through the gap between the main body 11 and the door 12. In this way, the radiation of electromagnetic waves from the gap between the main body 11 and the door 12 into the external environment can be reduced, further improving the accuracy and reliability of the test data.

[0048] It is understood that the first wave-absorbing foam 21 includes, but is not limited to, being fixed to the inner wall of the main body 11 of the enclosure by means of adhesive or screwing; the second wave-absorbing foam includes, but is not limited to, being fixed to the side of the door 12 facing the main body 11 by means of adhesive or screwing; and the third wave-absorbing foam includes, but is not limited to, being fixed to the periphery of the door 12 by means of adhesive or screwing.

[0049] In some embodiments, the first absorbing foam 21 includes a base and a plurality of protrusions. The base is plate-shaped and fixed to the inner wall of the housing body 11. The plurality of protrusions are fixed to the surface of the base away from the housing body 11. The plurality of protrusions are arranged in an array and each of the plurality of protrusions is square-pyramidal.

[0050] In some embodiments, the structures of the second and third wave-absorbing foams are the same as those of the first wave-absorbing foam 21. The structures of the second and third wave-absorbing foams can be referred to the embodiments of the structure of the first wave-absorbing foam 21 described above, and will not be repeated here.

[0051] In some embodiments of the signal generating component 3 described above, the radio frequency antenna 33 is a horn antenna.

[0052] In some embodiments of the signal detection component 4 described above, the test fixture 41 is provided with a clamping structure or a snap-fit ​​structure, which is used to clamp or snap the object to be tested so that the object to be tested is fixed to the test fixture.

[0053] This utility model embodiment provides a detection device 100, including a housing 1, an electromagnetic shielding structure 2, a signal generating component 3, and a signal detection component 4; the electromagnetic shielding structure 2 covers the inner wall of the housing 1; the signal generating component 3 includes a signal source 31, a first electrical connector 32, a radio frequency antenna 33, and a parabolic reflector 34. The signal source 31 is disposed outside the housing 1, the first electrical connector 32 passes through the housing 1, the radio frequency antenna 33 is obliquely disposed inside the housing 1, the parabolic reflector 34 is disposed inside the housing 1, and the radio frequency antenna 33 is located below the parabolic reflector 34. One end of the first electrical connector 32 is electrically connected to the signal source 31 outside the housing 1, and the other end of the first electrical connector 32 is... The enclosure 1 is electrically connected to the RF antenna 33. The signal detection component 4 includes a test fixture 41, an RF signal receiver 42, a second electrical connector 43, and a spectrum analyzer 44. The test fixture 41 is located inside the enclosure 1 and is situated in the focusing area below the parabolic reflector 34. The RF signal receiver 42 is mounted on the test fixture 41 and is used for mounting the object under test to cover the RF signal receiver 42. The second electrical connector 43 passes through the enclosure 1, and the spectrum analyzer 44 is located outside the enclosure 1. One end of the second electrical connector 43 is electrically connected to the RF signal receiver 42 inside the enclosure 1, and the other end of the second electrical connector 43 is electrically connected to the spectrum analyzer 44 outside the enclosure 1. In the above manner, the radio frequency antenna 33 in this embodiment of the present invention is tilted to radiate to the parabolic reflector 34, so that the spherical wave generated by the radio frequency antenna 33 is converted into a plane wave by the parabolic reflector 34 and focused to radiate to the test fixture 41. This reduces the scattering and diffraction of the electromagnetic field during the radiation process, enhances the electromagnetic field strength in the area of ​​the test fixture 41, reduces errors, and improves the accuracy of electromagnetic shielding effectiveness testing. It is especially suitable for electromagnetic shielding effectiveness testing of small objects under test.

[0054] This utility model also provides an embodiment of a detection system, which includes the detection device 100 described above. For the specific structure and function of the detection device 100, please refer to the above embodiments, which will not be repeated here.

[0055] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A detection device, characterized in that, include: Box; An electromagnetic shielding structure, wherein the electromagnetic shielding structure covers the inner wall of the enclosure; A signal generating component includes a signal source, a first electrical connector, a radio frequency antenna, and a parabolic reflector. The signal source is disposed outside the housing. The first electrical connector passes through the housing. The radio frequency antenna is obliquely disposed inside the housing. The parabolic reflector is disposed inside the housing and is located below the parabolic reflector. One end of the first electrical connector is electrically connected to the signal source outside the housing, and the other end of the first electrical connector is electrically connected to the radio frequency antenna inside the housing. A signal detection assembly includes a test fixture, a radio frequency (RF) signal receiver, a second electrical connector, and a spectrum analyzer. The test fixture is housed within a housing and located in the focusing area below the parabolic reflector. The RF signal receiver is mounted on the test fixture and is used for mounting an object under test to cover the RF signal receiver. The second electrical connector passes through the housing, and the spectrum analyzer is located outside the housing. One end of the second electrical connector is electrically connected to the RF signal receiver inside the housing, and the other end is electrically connected to the spectrum analyzer outside the housing.

2. The detection device according to claim 1, characterized in that, The shielding effectiveness of the object under test is defined as S. When the test fixture is not equipped with the object under test, the radio frequency signal strength detected by the spectrum analyzer is defined as S1. When the test fixture is equipped with the object under test, the radio frequency signal strength detected by the spectrum analyzer is defined as S2, where S = S1 - S2.

3. The detection device according to claim 1, characterized in that, It also includes a universal bracket, which is disposed on the inner side wall of the housing. The universal bracket is detachably connected to the radio frequency antenna and is used to install the radio frequency antenna and adjust the tilt angle of the radio frequency antenna.

4. The detection device according to claim 3, characterized in that, The universal bracket includes a first rod and a second rod. One end of the first rod is fixed to the inner side wall of the housing, and the other end of the first rod is hinged to the second rod. The end of the second rod away from the first rod is detachably connected to the radio frequency antenna.

5. The detection device according to claim 4, characterized in that, It also includes a first screw connector, which passes through the radio frequency antenna and is screwed to the end of the second rod away from the first rod, so that the end of the second rod away from the first rod is detachably connected to the radio frequency antenna.

6. The detection device according to claim 1, characterized in that, It also includes a fixed bracket, which is disposed on the inner top wall of the housing and is detachably connected to the parabolic reflector.

7. The detection device according to claim 6, characterized in that, It also includes a second screw connector, which passes through the parabolic reflector and is screwed to the fixed bracket, so that the fixed bracket and the parabolic reflector are detachably connected.

8. The detection device according to claim 1, characterized in that, The enclosure includes a main body and a door. The main body has a receiving cavity and an opening. The receiving cavity is connected to the opening. The receiving cavity is used to house the radio frequency antenna, parabolic reflector, test fixture and radio frequency signal receiver. The opening is used to allow the object under test to enter and exit the receiving cavity. The door is used to cover the opening.

9. The detection device according to claim 8, characterized in that, The electromagnetic shielding structure includes a first absorbing foam covering the inner wall of the main body of the enclosure, which is used to shield electromagnetic waves emitted by the radio frequency antenna from penetrating the enclosure to the external environment; and / or, the electromagnetic shielding structure includes a second absorbing foam covering the side of the door facing the main body of the enclosure, which is used to shield electromagnetic waves emitted by the radio frequency antenna from penetrating the door to the external environment; and / or, the electromagnetic shielding structure includes a third absorbing foam surrounding the periphery of the door, which seals the gap between the main body of the enclosure and the door, and is used to shield electromagnetic waves emitted by the radio frequency antenna from leaking from the gap between the main body of the enclosure and the door to the external environment.

10. A detection system, characterized in that, Includes the detection device as described in any one of claims 1-9.

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