CN115236414A - Shielding effectiveness test system and method - Google Patents

Abstract

The application provides a shielding effectiveness test system and a method, wherein a shielding interlayer is additionally arranged in a shielding chamber to distinguish a signal transmitting space and a signal receiving space, a signal transmitting device is placed in the signal transmitting space, during testing, external non-testing electromagnetic wave signals are isolated by the shielding chamber, a window for placing a sample to be tested is arranged on the shielding interlayer, only the electromagnetic wave signals which pass through the sample to be tested are received by the signal receiving device, the interference of the non-testing signals is isolated, and therefore the testing accuracy is greatly improved.

Description

Shielding effectiveness test system and method

Technical Field

The present application relates to the field of electromagnetic compatibility technologies, and in particular, to a system and a method for testing shielding effectiveness.

Background

With the development of electronic technology, the electromagnetic environment in the space environment is more and more complex. The complex electromagnetic environment can cause interference and even damage to the electronic equipment in the environment. And the electromagnetic shielding can cut off the propagation path of the electromagnetic wave, thereby eliminating the interference.

The shielding effectiveness of the electromagnetic shielding material can be effectively tested by the electromagnetic shielding effectiveness testing method. In the prior art, for example, an active light-transmitting shielding film shielding effectiveness testing method, device and system (publication No. CN109406899A, publication No. 2019.03.01) generate electromagnetic wave signals with preset intensity by an electromagnetic wave signal generating device, irradiate the electromagnetic wave signals to a window of a metal box body provided with a window of optical glass, the optical glass is provided with a light-transmitting shielding film to be tested, and an electromagnetic shielding effectiveness calculating device collects the intensity of the electromagnetic wave signals in the metal box body shielded by the light-transmitting shielding film to be tested, and calculates the ratio of the intensity of the electromagnetic wave signals in the metal box body without the light-transmitting shielding film to be tested to serve as the shielding effectiveness value of the light-transmitting shielding film to be tested. Therefore, the accurate test of the shielding effectiveness of the light-transmitting shielding film is realized.

However, this method has the following problems: during the test, besides the electromagnetic wave generated by the electromagnetic wave signal generating device, there is also electromagnetic wave interference of non-test signals, thereby causing inaccurate measurement of the shielding effectiveness of the shielding material.

Disclosure of Invention

The invention aims to provide a shielding effectiveness testing system and a shielding effectiveness testing method, which can solve the problems that in the existing shielding effectiveness testing technology of shielding materials, interference of external electromagnetic waves on a testing result is caused, and the accuracy of acquired data is influenced due to the fact that the fluctuation of electromagnetic wave signals in a metal box is large, so that the shielding effectiveness testing is inaccurate.

In order to achieve the above object, the present invention provides the following technical solutions:

in a first aspect, a shielding effectiveness testing system is provided, which includes:

the shielding chamber is divided into a signal transmitting space and a signal receiving space by a shielding interlayer, a window for installing a sample is formed in the shielding interlayer, and wave absorbing materials are arranged on the inner surfaces of the signal transmitting space and the signal receiving space;

the signal transmitting device is arranged in the signal transmitting space and used for transmitting the test electromagnetic wave signal;

and the signal receiving device is arranged in the signal receiving space and is used for receiving the test electromagnetic wave signal.

In one possible implementation manner of the first aspect, the system further includes: a sample frame detachably disposed on the window for supporting the sample.

In one possible implementation manner of the first aspect, the system further includes: a shielding assembly including a shielding layer for closing a gap between the sample frame and the sample.

In one possible implementation manner of the first aspect, the system further includes: the shielding assembly, the shielding assembly includes the shielding layer and pastes the layer, it is used for pasting to paste the layer the sample frame with the junction of sample, in order to seal the sample frame with gap between the sample, the shielding layer covers paste the layer surface.

In one possible implementation manner of the first aspect, the system further includes: the shielding assembly, the shielding assembly includes the shielding layer, pastes layer and conductive wire net, conductive wire net is used for filling the sample frame with gap between the sample, it is used for fixing to paste the layer conductive wire net, the shielding layer covers paste the layer surface.

In a possible implementation manner of the first aspect, a slide rail is fixed on the ground of the signal receiving space, an extending direction of the slide rail is perpendicular to a plane where the shielding interlayer is located, and the signal receiving device is fixed on the slide rail through a slider.

In one possible implementation manner of the first aspect, the system further includes: and the driving mechanism is used for driving the sliding block to drive the signal receiving device to slide along the sliding rail.

In a possible implementation manner of the first aspect, the system further includes a moving mechanism, a plurality of signal emitting device point locations are disposed in the signal emitting space, and the moving mechanism is configured to move the signal emitting device to any one of the signal emitting device point locations.

In a second aspect, a shielding effectiveness testing method is provided, which is applied to a shielding effectiveness testing system, and the method includes the following steps:

a signal transmitting step: the signal receiving device receives a signal transmitting instruction and transmits a test electromagnetic wave signal;

a signal receiving step: the signal receiving device collects the test electromagnetic wave signal and sends the reading value of the test electromagnetic wave signal to the control device;

a driving step: and the driving mechanism receives a first control signal sent by the control device, drives the sliding block to drive the signal receiving device to move to a preset position, and repeats the signal transmitting step to the driving step until the shielding effectiveness test is completed.

In a third aspect, a shielding effectiveness testing method is provided, which is applied to a shielding effectiveness testing system, and the method includes the following steps:

a signal transmitting step: the signal receiving device receives a signal transmitting instruction and transmits a test electromagnetic wave signal;

a signal receiving step: the signal receiving device collects the test electromagnetic wave signal and sends the reading value of the test electromagnetic wave signal to the control device;

moving: and the moving mechanism receives a second control signal sent by the control device, moves the signal transmitting device to a preset signal transmitting device point position, and repeats the steps from the signal transmitting step to the moving step until the shielding effectiveness test is completed.

Compared with the prior art that the signal transmitting device is arranged outside the shielding chamber and the signal receiving device is arranged in the shielding chamber to test the shielding effectiveness, the shielding effectiveness testing system and the shielding effectiveness testing method have the problem that external electromagnetic wave signals enter the shielding chamber through the shielding material to be tested to influence a testing result. This application is through setting up the shielding interlayer in the shielded room, and the space in with the shielded room divide into signal transmission space and signal reception space, and signal transmission space and signal reception space can both be isolated with external electromagnetic wave signal, avoid disturbing the test result. The shielding interlayer can prevent electromagnetic wave signals emitted by the signal emitting device from penetrating through the wall body and directly entering the signal receiving space without passing through the shielding material, and the testing of the shielding effect of the shielding material is influenced.

And secondly, wave-absorbing materials are arranged on the inner surfaces of the signal transmitting space and the signal receiving space, and can absorb electromagnetic wave signals reflected by the ground, the ceiling and the wall in the shielding room, so that the fluctuation of the electromagnetic wave signals caused by the reflection of the inner surface of the shielding room is reduced, and the energy density of the electromagnetic signals in the shielding room is kept stable. And then the electromagnetic wave emitted by the signal emitting device in the signal emitting space can enter the signal receiving space in a direction perpendicular to the shielding material to be tested, so that the inaccuracy of the test result of the electromagnetic wave signal caused by the angle is prevented. Meanwhile, the signal receiving device can acquire accurate electromagnetic wave data, so that the calculated shielding effectiveness is more accurate than the shielding effectiveness calculated without the wave-absorbing material.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Wherein:

FIG. 1 is a schematic diagram of a system for testing shielding effectiveness according to an embodiment;

FIG. 2 is a schematic diagram of a portion of a shielding effectiveness testing system according to an embodiment;

FIG. 3 is a schematic diagram of a portion of a shielding effectiveness testing system in accordance with an embodiment;

FIG. 4 is a schematic diagram of a portion of a shielding effectiveness testing system in accordance with an embodiment;

FIG. 5 is a schematic diagram illustrating a portion of a shielding effectiveness testing system according to an embodiment;

FIG. 6 is a schematic diagram illustrating a portion of a shielding effectiveness testing system according to an embodiment;

FIG. 7 is a flow diagram of a method for testing shielding effectiveness according to one embodiment;

FIG. 8 is a flow chart of a method for testing shielding effectiveness according to one embodiment.

Wherein, 1, shielding the chamber; 11. a shielding interlayer; 12. a wave-absorbing material; 13. a window; 14. a sample frame; 2. a signal transmitting device; 3. a signal receiving device; 4. a sample; 5. a shielding assembly; 6. a slide rail; 7. a slider; 8. a drive mechanism.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.

The technical solutions in the embodiments of the present application will be described below clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "comprises," "comprising," and "has" and any variations thereof in the description and claims of this application and in the above-described drawings are intended to cover non-exclusive inclusions. For example, a process, method, terminal, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. In the claims, the description, and the drawings of the specification of the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity/action/object from another entity/action/object without necessarily requiring or implying any such real-time relationship or order between such entities/actions/objects.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the prior art, the shielding effectiveness of a test sample is generally measured by placing a signal receiving device in a shielding chamber, placing a signal emitting device outside the shielding chamber, opening a window in the shielding chamber, and placing the sample to be tested at the window to measure the shielding effectiveness. However, there are many non-test electromagnetic wave signals outside, and these signals easily pass through the sample to be tested and enter the shielding chamber, and when the signal receiving device receives the test signal and the non-test signal at the same time, the accuracy of the test result is affected. Therefore, the shielding interlayer is additionally arranged in the shielding chamber, the signal transmitting space and the signal receiving space are distinguished, the signal transmitting device is placed in the signal transmitting space, when the signal transmitting device is tested, external non-testing electromagnetic wave signals are isolated by the shielding chamber, a window used for placing a sample to be tested is arranged on the shielding interlayer, only the electromagnetic wave signals which penetrate through the sample to be tested are received by the signal receiving device, the interference of the non-testing signals is isolated, and therefore the testing accuracy is greatly improved.

As shown in fig. 1 and 2, a shielding effectiveness testing system is proposed, which includes:

the device comprises a shielding chamber 1, wherein a shielding interlayer 11 is arranged in the shielding chamber 1, the shielding chamber 1 is divided into a signal transmitting space and a signal receiving space, a window 13 for installing a sample 4 is formed in the shielding interlayer 11, and wave-absorbing materials 12 are arranged on the inner surfaces of the signal transmitting space and the signal receiving space;

the signal transmitting device 2 is arranged in the signal transmitting space and is used for transmitting a test electromagnetic wave signal;

and the signal receiving device 3 is arranged in the signal receiving space and is used for receiving the test electromagnetic wave signal.

Fig. 1 is a structural diagram of a shielding effectiveness testing system in a top view, and the shielding chamber 1 is a closed all-metal box structure, or may be a closed space made of other shielding materials. The shielding isolation layer 11 is made of shielding material, and may be metal or other shielding material capable of meeting the shielding requirement, and is preferably made of metal material. The shielding interlayer 11 may be an integral structure, i.e. made of a single metal block, or formed by splicing or welding a plurality of metal blocks, and the splicing or welding is performed with a shielding treatment, such as sealing a conductive tape, so that the electromagnetic wave signal will not leak at the joint. Preferably, the shielding interlayer 11 is made of a whole metal material, and the joint of the shielding interlayer 11 and the shielding chamber 1 is subjected to shielding treatment, or the shielding interlayer 11 and the shielding chamber 1 are integrated, so that the test electromagnetic wave signal cannot be leaked. The wave-absorbing material 12 is preferably wave-absorbing sponge, and the wave-absorbing sponge is fixed on the inner surfaces of the signal transmitting space and the signal receiving space by glue or other fixing methods. In some scenarios, it is desirable that the shielding performance of the material be as weak as possible, such as automotive glass, and that the weaker the shielding performance, the better the handset signal received in the vehicle. When the shielding performance of the materials is tested, due to the weak shielding performance, a large number of electromagnetic wave signals penetrate through the sample 4 and enter the signal receiving space to cause the multipath effect, so that the wave absorbing materials 12 are arranged on the inner surfaces of the signal transmitting space and the signal receiving space. The purpose of the wave-absorbing material 12 is to weaken or even eliminate the multipath effect during the transmission of the electromagnetic wave, and to avoid the reflected electromagnetic wave from the inner surface of the shielding chamber 1, such as the floor, the wall, the ceiling, etc., which causes the inconsistent energy density and the random polarization in the shielding chamber 1, and thus causes the inaccuracy of the electromagnetic wave signal received by the signal receiving device 3. Therefore, by arranging the wave-absorbing material 12 on the inner surfaces of the signal transmitting space and the signal receiving space, the wave-absorbing material 12 can absorb the electromagnetic wave signals reflected by the ground, the ceiling and the walls in the shielding room 1, reduce the fluctuation of the electromagnetic wave signals caused by the reflection on the inner surface of the shielding room 1, and keep the energy density of the electromagnetic signals in the shielding room 1 stable. And then the electromagnetic wave emitted by the signal emission device 2 in the signal emission space can enter the signal receiving space in a direction perpendicular to the shielding material to be tested, so that the test result inaccuracy of the electromagnetic wave signal caused by the angle is prevented. Meanwhile, the signal receiving device 3 can acquire accurate electromagnetic wave data, so that the calculated shielding effectiveness is more accurate than that calculated without the wave-absorbing material 12.

The signal transmitting device 2 comprises a signal transmitter and a transmitting antenna, and the signal transmitting device 2 can be arranged at different positions in a signal transmitting space to measure the influence of signals transmitted at different distances and different angles on the shielding performance of the sample 4 to be measured. The signal receiving device 3 comprises a receiving antenna and a spectrum analyzer, and similarly, the signal receiving device 3 can be arranged at different positions in the signal receiving space to measure the influence of different distances and received signals on the shielding performance of the sample 4 to be measured.

In another implementation manner, the signal emitting device 2 may be placed in one of the two adjacent shielding chambers 1, the signal receiving device 3 may be placed in the other shielding chamber 1, a common wall of the two shielding chambers 1 serves as the shielding partition 11, a window 13 is formed in the common wall, and the sample 4 to be tested is placed in the window 13, so that the shielding effectiveness of the sample 4 to be tested can be accurately tested.

In another implementation mode, when the sample 4 to be measured is a material with strong shielding performance such as metal, the wave-absorbing material 12 is not arranged on the inner surfaces of the signal transmitting space and the signal receiving space. Since the material with strong shielding property such as metal can shield most of the electromagnetic wave signals, the electromagnetic wave signals passing through the sample 4 are not enough to cause multipath effect or have no great influence on the test result.

Compared with the prior art that the signal transmitting device 2 is arranged outside the shielding chamber 1, and the signal receiving device 3 is arranged in the shielding chamber 1 to test the shielding effectiveness, the shielding effectiveness test system has the problem that external electromagnetic wave signals enter the shielding chamber 1 through the shielding material to be tested to influence the test result. This application is through setting up shielding interlayer 11 in shielding room 1, and the space that will shield in the room 1 is divided into signal transmission space and signal reception space, and signal transmission space and signal reception space can both be isolated with external electromagnetic wave signal, avoid disturbing the test result. The shielding interlayer 11 can prevent the electromagnetic wave signals emitted by the signal emitting device 2 from directly entering the signal receiving space through the wall without passing through the shielding material, and the testing of the shielding effectiveness of the shielding material is influenced.

Secondly, the wave-absorbing materials 12 are arranged on the inner surfaces of the signal transmitting space and the signal receiving space, so that the wave-absorbing materials 12 can absorb electromagnetic wave signals reflected by the ground, the ceiling and the walls in the shielding room 1, the fluctuation of the electromagnetic wave signals caused by the reflection of the inner surface of the shielding room 1 is reduced, and the energy density of the electromagnetic signals in the shielding room 1 is kept stable. And then the electromagnetic wave emitted by the signal emitting device 2 in the signal emitting space can enter the signal receiving space in a direction perpendicular to the shielding material to be tested, so that the inaccuracy of the test result of the electromagnetic wave signal caused by the angle is prevented. Meanwhile, the signal receiving device 3 can acquire accurate electromagnetic wave data, so that the calculated shielding effectiveness is more accurate than the shielding effectiveness calculated without the wave-absorbing material 12.

As shown in fig. 3, in one embodiment, the system further comprises: a sample frame 14, wherein the sample frame 14 is detachably arranged on the window 13 and is used for supporting the sample 4.

During testing, different materials are often required to be tested in a large batch, the sample 4 is directly placed on the window 13 of the shielding interlayer 11, time is consumed for taking and placing the sample, efficiency is not high, and shielding processing is inconvenient between the sample 4 and the window 13. Therefore, the present embodiment is provided with a sample frame 14, the sample frame 14 is detachably mounted on the window 13, and the sample 4 to be measured is placed in the sample frame 14. The frame of the sample frame 14 is made of metal, and is usually made of galvanized steel and copper, so that electromagnetic wave signals can be effectively prevented from passing through the frame. The sample frame 14 is used for taking and placing the sample 4 to be tested, so that the taking and placing speed can be increased, and the testing efficiency can be improved.

As shown in fig. 4, in one embodiment, the system further comprises: a shielding assembly 5, the shielding assembly 5 comprising a shielding layer for closing a gap between the sample frame 14 and the sample 4.

When the sample 4 to be tested is mounted in the sample frame 14 for testing, due to the gaps existing between the sample 4 and the sample frame 14, the electromagnetic wave signals can enter the signal receiving space through the gaps, so that the electromagnetic wave signals received by the signal receiving device 3 are not all the electromagnetic wave signals penetrating through the sample 4 to be tested, which may affect the accuracy of the test result. The present embodiment is therefore also provided with a shielding assembly 5 comprising a shielding layer made of a shielding material such as metal, e.g. tin foil. The shielding layer is covered on the gap between the sample frame 14 and the sample 4, so that the electromagnetic wave signals can be prevented from entering the signal receiving space through the gap and interfering the test.

In one embodiment, the system further comprises: a shielding assembly 5, the shielding assembly 5 comprising a shielding layer for closing a gap between the sample frame 14 and the sample 4.

When the sample 4 to be tested is mounted in the sample frame 14 for testing, because gaps exist between the sample 4 and the sample frame 14, electromagnetic wave signals can enter the signal receiving space through the gaps, so that the electromagnetic wave signals received by the signal receiving device 3 are not all the electromagnetic wave signals penetrating through the sample 4 to be tested, which may affect the accuracy of the test result. Therefore, the present embodiment is further provided with a shielding assembly 5 including a shielding layer and an adhesive layer. Wherein the shielding layer is made of shielding material such as metal, and the adhesive layer is made of adhesive material. The shielding member 5 of the present embodiment is preferably a conductive tape. The pasting layer of the shielding component 5 is pasted at the joint of the sample 4 and the sample frame 14, the gap of the joint is sealed, the shielding layer covers the surface of the pasting layer, electromagnetic wave signals are shielded, and the electromagnetic wave signals are prevented from entering a signal receiving space through the pasting layer to interfere with testing.

In one embodiment, the system further comprises: shielding component 5, shielding component 5 includes the shielding layer, pastes layer and conductive wire net, conductive wire net is used for filling sample frame 14 with gap between the sample 4, it is used for fixing to paste the layer conductive wire net, the shielding layer covers paste the layer surface.

When the sample 4 to be tested is mounted in the sample frame 14 for testing, due to the gaps existing between the sample 4 and the sample frame 14, the electromagnetic wave signals can enter the signal receiving space through the gaps, so that the electromagnetic wave signals received by the signal receiving device 3 are not all the electromagnetic wave signals penetrating through the sample 4 to be tested, which may affect the accuracy of the test result. Therefore, the shielding assembly 5 is further provided in this embodiment, and includes a shielding layer, an adhesive layer, and a conductive wire mesh, where the conductive wire mesh is made of a metal conductive wire, and has a good shielding performance, and the conductive wire mesh is filled in a gap between the sample frame 14 and the sample 4 to block the gap, so as to serve as a first heavy protection. Because the conductive wire mesh is fixed by means of friction force between the conductive wire mesh and the gap and is easy to fall off, a layer of pasting layer is pasted outside the conductive wire mesh and used for fixing the conductive wire mesh, and the shielding layer covers the surface of the pasting layer and serves as second protection. By means of double protection of the conductive wire mesh and the shielding layer, electromagnetic wave signals are prevented from entering a signal receiving space through the adhesive layer and interfering with testing.

As shown in fig. 5, in one embodiment, a slide rail 6 is fixed on the ground of the signal receiving space, the extending direction of the slide rail 6 is perpendicular to the plane of the shielding interlayer 11, and the signal receiving device 3 is fixed on the slide rail 6 through a slide block 7.

Fig. 5 is a partial structure diagram of the shielding effectiveness testing system under the side view, when the influence of the distance between the test sample 4 and the signal receiving device 3 on the shielding performance of the sample 4 is detected, the position of the signal receiving device 3 needs to be adjusted, and the problem that the adjusted position is inaccurate easily occurs during manual adjustment. Therefore, in the present embodiment, the slide rail 6 is fixed on the ground of the signal receiving space, and the extending direction of the slide rail 6 is perpendicular to the plane of the shielding interlayer 11, so that the connecting direction of the signal receiving device 3 fixed on the slide rail 6 and the sample 4 is perpendicular to the plane of the sample 4, and the testing requirements are met. And the position of the signal receiving device 3 is adjusted by the slide rail 6, which is more accurate than the adjustment of manually carrying the signal receiving device 3.

As shown in fig. 6, in one embodiment, the system further comprises: and the driving mechanism 8 is used for driving the sliding block 7 to drive the signal receiving device 3 to slide along the sliding rail 6.

Fig. 6 is a partial structural diagram of a shielding effectiveness testing system under a side view, when a distance between a test sample 4 and a signal receiving device 3 affects shielding performance of the sample 4, a position of the signal receiving device 3 needs to be adjusted, and when a signal receiving position is adjusted manually, movement of a person causes disturbance of energy of electromagnetic waves at the same indoor position, so that a signal received by the signal receiving device 3 fluctuates greatly, and accuracy of a test is affected. Therefore, the present embodiment is provided with the driving mechanism 8, and when receiving the control signal, the driving mechanism 8 drives the slide rail 6 to drive the signal receiving device 3 to slide along the slide rail 6. The position of the signal receiving device 3 is automatically adjusted, and the influence on the accuracy of a test result caused by electromagnetic wave signal fluctuation caused by manual adjustment is avoided.

In one embodiment, the system further includes a moving mechanism, a plurality of signal emitting device sites are disposed in the signal emitting space, and the moving mechanism is configured to move the signal emitting device 2 to any one of the signal emitting device sites.

When the distance and the angle between the test sample 4 and the signal emitting device 2 affect the shielding performance of the sample 4, the position of the signal emitting device 2 needs to be adjusted, and when the number of test positions is large, the manual adjustment efficiency is low. Therefore, the embodiment is provided with a moving mechanism, the moving mechanism can be a motor driving the signal emitting device 2 to move on the sliding rail 6, and the robot can also grab the signal emitting device 2 to move to different positions. A plurality of signal transmitting device point positions are arranged in the signal transmitting space, and the number of the signal transmitting device point positions is different in different tests according to actual conditions. And testing the influence of signals with different distances and angles on the shielding performance of the sample 4 at different point positions. The moving mechanism is used to move the signal emitting device 2 to any one of the signal emitting device sites. The position of the signal transmitting device 2 is automatically adjusted, and compared with manual movement, the automatic positioning device is higher in efficiency and more accurate in positioning.

As shown in fig. 7, a shielding effectiveness testing method is provided, which is applied to a shielding effectiveness testing system, and the method includes the following steps:

a signal transmission step 101: the signal transmitting device receives a signal transmitting instruction and transmits a test electromagnetic wave signal;

a signal receiving step 102: the signal receiving device collects the test electromagnetic wave signal and sends the reading value of the test electromagnetic wave signal to the control device;

a driving step 103: and the driving mechanism receives a first control signal sent by the control device, drives the sliding block to drive the signal receiving device to move to a preset position, and repeats the signal transmitting step to the driving step until the shielding effectiveness test is completed.

The signal transmitting device, the signal receiving device and the driving mechanism are electrically connected with an external control device, and after the control device transmits a signal transmitting instruction to the signal transmitting device, the signal transmitting device transmits a test electromagnetic wave signal; the signal receiving device automatically collects the testing electromagnetic wave signals penetrating through the sample, reads the values and sends the read values to the control device. When the position of the signal receiving device needs to be changed after the test result of the signal receiving device at a certain position is tested, the control device sends a first control signal to the driving mechanism, controls the driving device to drive the sliding block to drive the signal receiving device to move to a preset position, and repeats the signal transmitting step 101 to the driving step 103 until all the positions are tested, so that the shielding effectiveness test is completed.

As shown in fig. 8, a shielding effectiveness testing method is provided, which is applied to a shielding effectiveness testing system, and the method includes the following steps:

a signal transmission step 201: the signal transmitting device receives a signal transmitting instruction and transmits a test electromagnetic wave signal;

a signal receiving step 202: the signal receiving device collects the test electromagnetic wave signal and sends the reading value of the test electromagnetic wave signal to the control device;

a moving step 203: and the moving mechanism receives a second control signal sent by the control device, moves the signal transmitting device to a preset signal transmitting device point position, and repeats the signal transmitting step 201 to the moving step 203 until the shielding effectiveness test is completed.

The signal transmitting device, the signal receiving device and the moving mechanism are electrically connected with an external control device, and after the control device transmits a signal transmitting instruction to the signal receiving device, the signal transmitting device transmits a test electromagnetic wave signal; the signal receiving device automatically collects the testing electromagnetic wave signals penetrating through the sample, reads the values and sends the read values to the control device. After the test result of the signal transmitting device at a certain position is tested, when the position of the signal transmitting device needs to be changed, the control device sends a first control signal to the moving mechanism, controls the moving mechanism to move the signal transmitting device to a preset position, and repeats the signal transmitting steps 201 to 203 until all the positions are tested, so as to complete the shielding effectiveness test.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A shielding effectiveness testing system, the system comprising:

the shielding chamber is divided into a signal transmitting space and a signal receiving space by a shielding interlayer, a window for installing a sample is formed in the shielding interlayer, and wave-absorbing materials are arranged on the inner surfaces of the signal transmitting space and the signal receiving space;

the signal transmitting device is arranged in the signal transmitting space and used for transmitting the test electromagnetic wave signal;

and the signal receiving device is arranged in the signal receiving space and is used for receiving the test electromagnetic wave signal.

2. The shielding effectiveness testing system of claim 1, wherein the system further comprises:

a sample frame detachably disposed on the window for supporting the sample.

3. The shielding effectiveness testing system of claim 2, wherein the system further comprises: a shielding assembly including a shielding layer for closing a gap between the sample frame and the sample.

4. The shielding effectiveness testing system of claim 2, wherein the system further comprises: the shielding assembly, the shielding assembly includes the shielding layer and pastes the layer, it is used for pasting to paste the layer the sample frame with the junction of sample, in order to seal the sample frame with gap between the sample, the shielding layer covers paste the layer surface.

5. The shielding effectiveness testing system of claim 2, wherein the system further comprises: the shielding assembly comprises a shielding layer, an adhesive layer and a conductive wire mesh, the conductive wire mesh is used for filling a gap between the sample frame and the sample, the adhesive layer is used for fixing the conductive wire mesh, and the shielding layer covers the surface of the adhesive layer.

6. The shielding effectiveness testing system of claim 1, wherein a slide rail is fixed on the ground of the signal receiving space, the extension direction of the slide rail is perpendicular to the plane of the shielding interlayer, and the signal receiving device is fixed on the slide rail through a slider.

7. The shielding effectiveness testing system of claim 6, wherein the system further comprises: and the driving mechanism is used for driving the sliding block to drive the signal receiving device to slide along the sliding rail.

8. The shielding effectiveness testing system according to claim 1, further comprising a moving mechanism, wherein a plurality of signal emitting device sites are disposed in the signal emitting space, and wherein the moving mechanism is configured to move the signal emitting device to any one of the signal emitting device sites.

9. A shielding effectiveness testing method applied to the shielding effectiveness testing system of claim 7, wherein the method comprises the following steps:

a signal transmitting step: the signal transmitting device receives a signal transmitting instruction and transmits a test electromagnetic wave signal;

a signal receiving step: the signal receiving device collects the test electromagnetic wave signal and sends the reading value of the test electromagnetic wave signal to the control device;

a driving step: and the driving mechanism receives a first control signal sent by the control device, drives the sliding block to drive the signal receiving device to move to a preset position, and repeats the signal transmitting step to the driving step until the shielding effectiveness test is completed.

10. A shielding effectiveness testing method applied to the shielding effectiveness testing system of claim 8, wherein the method comprises the following steps:

a signal transmitting step: the signal transmitting device receives a signal transmitting instruction and transmits a test electromagnetic wave signal;

a signal receiving step: the signal receiving device collects the test electromagnetic wave signal and sends the reading value of the test electromagnetic wave signal to the control device;

moving: and the moving mechanism receives a second control signal sent by the control device, moves the signal transmitting device to a preset signal transmitting device point position, and repeats the signal transmitting step to the moving step until the shielding effectiveness test is completed.

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