CN112698110A - Test method and system for testing shielding effectiveness of material - Google Patents
Test method and system for testing shielding effectiveness of material Download PDFInfo
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- CN112698110A CN112698110A CN202011450326.6A CN202011450326A CN112698110A CN 112698110 A CN112698110 A CN 112698110A CN 202011450326 A CN202011450326 A CN 202011450326A CN 112698110 A CN112698110 A CN 112698110A
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- 239000002184 metal Substances 0.000 claims description 15
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0835—Testing shielding, e.g. for efficiency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
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Abstract
The invention relates to the technical field of materials, in particular to a test method for testing shielding effectiveness of a material, which comprises the following steps: a material presetting space is arranged between the electromagnetic transmitting device and the electromagnetic receiving device which are oppositely arranged; modulating the electromagnetic emission intensity of the electromagnetic emission device radiation; placing a material to be tested in a material preset space, and receiving electromagnetic emission intensity through an electromagnetic receiving device to perform a first electromagnetic receiving test; when the material to be tested is placed in the material preset space, the electromagnetic emission intensity is received through the electromagnetic receiving device so as to carry out a second electromagnetic receiving test; and determining the shielding effectiveness of the material to be tested according to the test results of the first electromagnetic receiving test and the second electromagnetic receiving test. When the material to be tested is tested, the material to be tested does not need to be fixed in a compression mode, the material to be tested is directly placed in the material preset space, the sample plate of the material to be tested with a non-flat plate structure can be tested, the test process is greatly simplified, the operation is convenient, and the cost is low.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a method and a system for testing shielding effectiveness of a material.
Background
Electromagnetic radiation is a new pollution mode, not only harms human health and causes mutual interference among electronic equipment, but also harms national information safety after electromagnetic information is leaked, electromagnetic shielding is one of main technical measures for inhibiting electromagnetic interference, and the application range is wide. Currently, the shielding effectiveness of materials is generally tested according to the national standard GB/T52471 'method for measuring shielding effectiveness of electromagnetic shielding coatings', the military standard SJ20524 'method for measuring shielding effectiveness of materials' in the electronic industry, and the national military standard GJB6190 'method for measuring shielding effectiveness of materials'.
At present, when the shielding effectiveness of a material is tested, the material to be tested needs to be manufactured into a plane sample plate with a standard size, namely, the material to be tested can be tested only after being processed into a plane-shaped material, so that the test cost is increased; in addition, because the existing material shielding test method mainly comprises a flange coaxial test method, a shielding chamber window test method, a shielding camera bellows window test method and the like, when the existing test method is applied to test the shielding effectiveness, required test equipment and devices need to be applied to a shielding chamber or a flange coaxial device and the like to complete the test work besides general equipment such as a signal source, an antenna and receiving equipment, and the existing test method brings more inconvenience to the test process while increasing the test cost due to the large number of the equipment and devices. That is, the existing method for testing the shielding effectiveness of the material has the problems that the material in a plane form can only be tested, and the testing cost is high and the convenience is poor.
Disclosure of Invention
The embodiment of the invention provides a method and a system for testing the shielding effectiveness of a material, which are used for solving the problems that only a plane-form material can be tested when the shielding effectiveness of the material is tested in the prior art, the testing cost is high, the convenience is poor and the like.
In a first aspect of the present invention, a testing method for testing shielding effectiveness of a material is provided, comprising:
a material presetting space is arranged between the electromagnetic transmitting device and the electromagnetic receiving device which are oppositely arranged, and the material presetting space is used for placing a material to be detected;
modulating the electromagnetic emission intensity of the electromagnetic emission device radiation;
before the material to be tested is placed in the material preset space, the electromagnetic emission intensity is received through the electromagnetic receiving device so as to carry out a first electromagnetic receiving test;
when the material to be tested is placed in the material preset space, the electromagnetic emission intensity is received through the electromagnetic receiving device so as to carry out a second electromagnetic receiving test;
and determining the shielding effectiveness of the material to be tested according to the test results of the first electromagnetic receiving test and the second electromagnetic receiving test.
The invention has the beneficial effects that: when testing the material to be tested, need not the fixed material to be tested of crimping, directly with the material to be tested place in the material preset space can, can also test the material model to be tested of dull and stereotyped structure, the test procedure only needs to test the debugging and can accomplish the test procedure to electromagnetic emission device and electromagnetism receiving arrangement moreover, has simplified the test procedure greatly, and the operation is convenient, and is with low costs.
On the basis of the technical scheme, the invention can be further improved as follows.
Optionally, after determining the shielding effectiveness of the material to be tested according to the test results of the first electromagnetic reception test and the second electromagnetic reception test, the method further includes:
and modulating different electromagnetic emission intensities for the electromagnetic emission device to obtain the shielding effectiveness of the material to be detected on different electromagnetic emission intensities.
The invention adopting the alternative scheme has the beneficial effect that the test range of the shielding effectiveness of the material to be tested on different electromagnetic emission intensities can be measured by changing the electromagnetic emission intensity of the electromagnetic emission device.
Optionally, before the material to be tested is placed in the material presetting space, the electromagnetic receiving device receives the electromagnetic emission intensity to perform a first electromagnetic receiving test, including:
and converting the received electromagnetic emission intensity into a first electromagnetic receiving intensity through the electromagnetic receiving device, and acquiring a parameter value of the first electromagnetic receiving intensity when the first electromagnetic receiving intensity is greater than a required value or a predicted value of the shielding effectiveness of the material to be detected.
The invention adopting the above alternative scheme has the beneficial effect that through the first electromagnetic receiving test, the electromagnetic receiving device obtains the parameter value of the first electromagnetic receiving intensity when the material to be tested is not placed in the material preset space.
Optionally, when the material to be tested is placed in the material presetting space, the electromagnetic receiving device receives the electromagnetic emission intensity to perform a second electromagnetic receiving test, including:
when the material to be detected is placed in the material preset space, the electromagnetic receiving device converts the received electromagnetic emission intensity into a second electromagnetic receiving intensity, and when the second electromagnetic receiving intensity is larger than the background noise of receiving equipment in the electromagnetic receiving device, a parameter value of the second electromagnetic receiving intensity is obtained;
and when the material to be detected with the metal attachment layer arranged on the surface is placed in the material preset space, the electromagnetic receiving device converts the received electromagnetic emission intensity into a third electromagnetic receiving intensity, and when the third electromagnetic receiving intensity is greater than the background noise of receiving equipment in the electromagnetic receiving device, the parameter value of the third electromagnetic receiving intensity is obtained.
The alternative scheme adopted by the invention has the beneficial effects that through the second electromagnetic receiving test, when the electromagnetic receiving device is used for placing the material to be tested in the material preset space, the parameter value of the second electromagnetic receiving intensity and the parameter value of the third electromagnetic receiving intensity are obtained.
Optionally, the determining the shielding effectiveness of the material to be tested according to the test results of the first electromagnetic reception test and the second electromagnetic reception test includes:
and determining the shielding effectiveness of the material to be detected according to the acquired parameter value of the first electromagnetic receiving intensity, the acquired parameter value of the second electromagnetic receiving intensity and the acquired parameter value of the third electromagnetic receiving intensity.
The alternative scheme adopted by the invention has the beneficial effect that the shielding effectiveness of the material to be detected is determined according to the acquired parameter values.
Optionally, the electromagnetic receiving intensity includes magnetic field intensity, electric field intensity, voltage and power;
when the electromagnetic receiving intensity is the voltage, the method for determining the shielding effectiveness of the material to be measured according to the acquired parameter value of the first electromagnetic receiving intensity, the acquired parameter value of the second electromagnetic receiving intensity, and the acquired parameter value of the third electromagnetic receiving intensity is as follows:
SE(dB)＝20*log(V0/(V1-V2)) (1)
in the formula (1), the SE is the shielding effectiveness, the V0 represents a parameter value of the first electromagnetic reception intensity, the V1 represents a parameter value of the second electromagnetic reception intensity, and the V2 represents a parameter value of the third electromagnetic reception intensity.
The alternative scheme adopted by the invention has the beneficial effect that the shielding effectiveness of the material to be measured is obtained by taking the logarithm of the ratio of the difference value of the parameter value V0 of the first electromagnetic receiving intensity, the parameter value V1 of the second electromagnetic receiving intensity and the parameter value V2 of the third electromagnetic receiving intensity.
In a second aspect of the present invention, there is provided a testing system for testing shielding effectiveness of a material, comprising:
the test device comprises a test platform, an electromagnetic transmitting device and an electromagnetic receiving device, wherein the electromagnetic transmitting device and the electromagnetic receiving device are oppositely arranged on the test platform;
the test platform comprises:
the modulation module is used for modulating the electromagnetic emission intensity radiated by the electromagnetic emission device;
the first test module is used for receiving the electromagnetic emission intensity through the electromagnetic receiving device to perform a first electromagnetic receiving test before the material to be tested is placed in the material preset space;
the second test module is used for receiving the electromagnetic emission intensity through the electromagnetic receiving device to perform a second electromagnetic receiving test when the material to be tested is placed in the material preset space;
and the determining module is used for determining the shielding effectiveness of the material to be tested according to the test results of the first electromagnetic receiving test and the second electromagnetic receiving test.
The invention has the beneficial effects that: the invention can test the non-planar material, the material to be tested is not required to be pressed and fixed during the test, the material to be tested is directly placed in the material preset space on the test platform, and the test process can be completed only by testing and debugging the electromagnetic transmitting device and the electromagnetic receiving device on the test platform, so that the test process is greatly simplified, the operation is convenient, and the cost is low.
On the basis of the technical scheme, the invention can be further improved as follows.
Optionally, the modulation module is further configured to: and modulating different electromagnetic emission intensities for the electromagnetic emission device to obtain the shielding effectiveness of the material to be detected on different electromagnetic emission intensities.
The invention adopts the alternative scheme, which has the beneficial effect that the test range of the shielding effectiveness of the material to be tested on different electromagnetic emission intensities can be tested by changing the electromagnetic emission intensity of the electromagnetic emission device under the control of the modulation module.
Optionally, the first test module is specifically configured to: converting the received electromagnetic emission intensity into a first electromagnetic receiving intensity through the electromagnetic receiving device, and acquiring a parameter value of the first electromagnetic receiving intensity when the first electromagnetic receiving intensity is greater than a required value or a predicted value of the shielding effectiveness of the material to be detected;
the second test module is specifically configured to: when the material to be detected is placed in the material preset space, the electromagnetic receiving device converts the received electromagnetic emission intensity into a second electromagnetic receiving intensity, and when the second electromagnetic receiving intensity is larger than the background noise of receiving equipment in the electromagnetic receiving device, a parameter value of the second electromagnetic receiving intensity is obtained; and when the material to be detected with the metal attachment layer arranged on the surface is placed in the material preset space, the electromagnetic receiving device converts the received electromagnetic emission intensity into a third electromagnetic receiving intensity, and when the third electromagnetic receiving intensity is larger than the background noise of receiving equipment in the electromagnetic receiving device, a parameter value of the third electromagnetic receiving intensity is obtained.
The invention adopts the above alternative scheme, which has the advantages that the parameter value of the first electromagnetic receiving intensity is obtained when the electromagnetic receiving device is not provided with the material to be tested in the material presetting space under the control of the first testing module, and the parameter value of the second electromagnetic receiving intensity and the parameter value of the third electromagnetic receiving intensity are obtained when the electromagnetic receiving device is provided with the material to be tested in the material presetting space under the control of the second testing module.
Optionally, the determining module is specifically configured to:
and determining the shielding effectiveness of the material to be detected according to the acquired parameter value of the first electromagnetic receiving intensity, the acquired parameter value of the second electromagnetic receiving intensity and the acquired parameter value of the third electromagnetic receiving intensity.
The alternative scheme adopted by the invention has the beneficial effect that the shielding effectiveness of the material to be detected is determined according to the acquired parameter values.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart of a testing method for testing shielding effectiveness of a material according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a system for testing shielding effectiveness of a material according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a method for testing shielding effectiveness of a test material according to an embodiment of the present invention.
In the figure: the method comprises the following steps of 1-a test platform, 2-an electromagnetic receiving device, 21-a receiving device, 22-an attenuator, 23-a receiving antenna, 3-an electromagnetic transmitting device, 31-a transmitting antenna, 32-a power amplifier, 33-an electromagnetic signal source, 4-a material preset space, 5-a material to be tested, 6-a test power supply, 7-a determining module, 8-a second test module, 9-a first test module and 10-a modulating module.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In a first embodiment of the present invention, a testing method for testing shielding effectiveness of a material is provided, please refer to fig. 1-3, which includes the following steps:
step S11, a material presetting space 4 is arranged between the electromagnetic emitting device 3 and the electromagnetic receiving device 2 which are oppositely arranged, and the material presetting space 4 is used for placing the material 5 to be measured;
step S12, modulating the electromagnetic emission intensity radiated by the electromagnetic emission device 3;
step S13, placing the material 5 to be tested in front of the material preset space 4, and receiving the electromagnetic emission intensity through the electromagnetic receiving device 2 to perform a first electromagnetic receiving test;
step S14, when the material 5 to be tested is placed in the material preset space 4, the electromagnetic receiving device 2 receives the electromagnetic emission intensity to perform a second electromagnetic receiving test;
step S15, determining the shielding effectiveness of the material 5 to be tested according to the test results of the first electromagnetic reception test and the second electromagnetic reception test.
The embodiment of the invention can test the non-planar material, the material 5 to be tested is not required to be fixed by pressing during the test, the material 5 to be tested is directly placed in the material preset space 4, and the test process can be completed only by testing and debugging the electromagnetic transmitting device 3 and the electromagnetic receiving device 2, so that the test process is greatly simplified, the operation is convenient, and the cost is low.
Optionally, after step S15, the method further includes: by modulating different electromagnetic emission intensities for the electromagnetic emission device 3, the shielding effectiveness of the material 5 to be measured on different electromagnetic emission intensities can be obtained. In the embodiment of the invention, the electromagnetic emission intensity of the electromagnetic emission device is changed, and the steps S13-S15 are repeated, so that the test range of the shielding effectiveness of the material to be tested on different electromagnetic emission intensities can be measured. Therefore, the testing of the shielding effectiveness of the material to be tested is realized.
The embodiment of the invention adopts the testing method process of the steps S11-S15, solves the problems that special testing devices such as shielding chambers or flange coaxial devices are required to be applied and the material 5 to be tested needs to be a planar material, and the material 5 to be tested does not need to be fixed by pressing during testing, so that the testing process has good convenience and low cost.
Specifically, step S13 specifically includes: the electromagnetic receiving device 2 converts the received electromagnetic emission intensity into a first electromagnetic receiving intensity, and when the first electromagnetic receiving intensity is larger than a required value or a predicted value of the shielding effectiveness of the material 5 to be detected, a parameter value of the first electromagnetic receiving intensity is obtained. Step S14 specifically includes: step a, when a material 5 to be measured is placed in a material preset space 4, the received electromagnetic emission intensity is converted into a second electromagnetic receiving intensity through the electromagnetic receiving device 2, and when the second electromagnetic receiving intensity is larger than the background noise of the receiving equipment 21 in the electromagnetic receiving device 2, a parameter value of the second electromagnetic receiving intensity is obtained. And b, when the material to be detected 5 with the metal attachment layer arranged on the surface is placed in the material preset space 4, the electromagnetic receiving device 2 is used for converting the received electromagnetic emission intensity into a third electromagnetic receiving intensity, and when the third electromagnetic receiving intensity is larger than the background noise of the receiving equipment 21 in the electromagnetic receiving device 2, a parameter value of the third electromagnetic receiving intensity is obtained. In the embodiment of the present invention, the metal adhesion layer includes a copper foil, a metal tape and a metallic paint, and the metal adhesion layer in the embodiment of the present invention may also be made of other materials in other forms or structures.
Therefore, in the embodiment of the present invention, through the first electromagnetic reception test, when the material 5 to be measured is not placed in the material presetting space 4, the electromagnetic receiving device 2 obtains the parameter value of the first electromagnetic reception intensity, and through the second electromagnetic reception test, when the material 5 to be measured is placed in the material presetting space 4, the electromagnetic receiving device 2 obtains the parameter value of the second electromagnetic reception intensity and the parameter value of the third electromagnetic reception intensity. Then, step S15 specifically includes the following steps: and determining the shielding effectiveness of the material to be detected according to the acquired parameter value of the first electromagnetic receiving intensity, the acquired parameter value of the second electromagnetic receiving intensity and the acquired parameter value of the third electromagnetic receiving intensity. In practical engineering, the electromagnetic receiving strength includes a magnetic field strength, an electric field strength, a voltage and a power, which are not limited herein, and when the electromagnetic receiving strength is a voltage, in step S15, the method for determining the shielding effectiveness of the material 5 to be measured according to the acquired parameter value of the first electromagnetic receiving strength, the acquired parameter value of the second electromagnetic receiving strength and the acquired parameter value of the third electromagnetic receiving strength includes:
SE(dB)＝20*log(V0/(V1-V2)) (1)
in the formula (1), SE is the shielding effectiveness, V0 represents the parameter value of the first electromagnetic reception intensity, V1 represents the parameter value of the second electromagnetic reception intensity, and V2 represents the parameter value of the third electromagnetic reception intensity. Therefore, the shielding effectiveness of the material to be tested is obtained by taking the logarithm of the ratio of the difference value of the parameter value V0 of the first electromagnetic receiving intensity, the parameter value V1 of the second electromagnetic receiving intensity and the parameter value V2 of the third electromagnetic receiving intensity.
In a second embodiment of the present invention, a testing system for testing shielding effectiveness of a material is provided, referring to fig. 2, including:
the testing platform comprises a testing platform 1, an electromagnetic transmitting device 3 and an electromagnetic receiving device 2 which are oppositely arranged on the testing platform 1, wherein a material presetting space 4 is arranged between the electromagnetic transmitting device 3 and the electromagnetic receiving device 2, and the material presetting space 4 is used for placing a material 5 to be tested.
The test platform 1 includes: a modulation module 10 for modulating the electromagnetic emission intensity radiated by the electromagnetic emission device 3. The first testing module 9 is configured to receive the electromagnetic emission intensity through the electromagnetic receiving device 2 before the material 5 to be tested is placed in the material pre-setting space 4, so as to perform a first electromagnetic receiving test. And the second testing module 8 is used for receiving the electromagnetic emission intensity through the electromagnetic receiving device 2 to perform a second electromagnetic receiving test when the material 5 to be tested is placed in the material presetting space 4. And the determining module 7 is used for determining the shielding effectiveness of the material 5 to be tested according to the test results of the first electromagnetic receiving test and the second electromagnetic receiving test.
The embodiment of the invention can test the non-planar materials, the materials to be tested are not required to be fixed by crimping during testing, the materials 5 to be tested are directly placed in the material preset space 4 on the testing platform 1, and the testing process can be completed only by testing and debugging the electromagnetic transmitting device 3 and the electromagnetic receiving device 2 on the testing platform 1, so that the testing process is greatly simplified, the operation is convenient, and the cost is low. Referring to fig. 2, the test platform 1 further includes a test power supply 6 for supplying power to each module, the test power supply 6 is electrically connected to the modulation module 10, the first test module 9, the second test module 8 and the determination module 7, respectively, when the shielding effectiveness test is performed, the test power supply 6 is turned on, and the shielding effectiveness of the material 5 to be tested is tested and measured after the platform to be tested is stable in operation, so that convenience in the shielding effectiveness test process is improved.
Specifically, the modulation module 10 is further configured to: by modulating different electromagnetic emission intensities for the electromagnetic emission device 3, the shielding effectiveness of the material 5 to be measured on different electromagnetic emission intensities can be obtained. Therefore, the shielding effectiveness of the material 5 to be measured on different electromagnetic emission intensities can be measured by changing the electromagnetic emission intensity of the electromagnetic emission device 3 under the control of the modulation module 10. The first test module 9 is specifically configured to: the electromagnetic receiving device 2 converts the received electromagnetic emission intensity into a first electromagnetic receiving intensity, and when the first electromagnetic receiving intensity is larger than a required value or a predicted value of the shielding effectiveness of the material 5 to be detected, a parameter value of the first electromagnetic receiving intensity is obtained. The second test module 8 is specifically configured to: when the material 5 to be measured is placed in the material presetting space 4, the received electromagnetic emission intensity is converted into a second electromagnetic receiving intensity through the electromagnetic receiving device 2, and when the second electromagnetic receiving intensity is larger than the background noise of the receiving equipment 21 in the electromagnetic receiving device 2, a parameter value of the second electromagnetic receiving intensity is obtained. And when the material to be detected 5 with the metal attachment layer arranged on the surface is placed in a material preset space, converting the received electromagnetic emission intensity into a third electromagnetic receiving intensity through the electromagnetic receiving device 2, and acquiring a parameter value of the third electromagnetic receiving intensity when the third electromagnetic receiving intensity is greater than the background noise of the receiving equipment 21 in the electromagnetic receiving device 2.
Specifically, referring to fig. 2, in the present embodiment, the electromagnetic emission device 3 includes an electromagnetic signal source 33, a power amplifier 32 and an emission antenna 31, the electromagnetic signal source 33 is used for modulating different electromagnetic emission intensities under the control of the modulation module 10, the power amplifier 32 is used for amplifying the electromagnetic emission intensity when the signal power output by the electromagnetic signal source 33 does not satisfy the shielding effectiveness of the material to be measured 5, and the emission antenna 31 is used for radiating the electromagnetic emission intensity. The electromagnetic receiving apparatus 2 includes a receiving antenna 23, a receiving device 21, and an attenuator 22, where the receiving antenna 23 is configured to convert the received electromagnetic emission intensity into a first electromagnetic reception intensity, a second electromagnetic reception intensity, and a third electromagnetic reception intensity, the receiving device 21 is configured to detect and measure the first electromagnetic reception intensity, the second electromagnetic reception intensity, and the third electromagnetic reception intensity to obtain parameter values of each electromagnetic reception intensity, and the attenuator 22 is configured to perform signal attenuation processing on the first electromagnetic reception intensity, the second electromagnetic reception intensity, and the third electromagnetic reception intensity when the signal intensity of the first electromagnetic reception intensity, the second electromagnetic reception intensity, and the third electromagnetic reception intensity is greater than the port level of the receiving device 21 to protect the receiving device 21.
In the embodiment of the present invention, under the control of the first testing module 9, the electromagnetic receiving device 2 obtains the parameter value of the first electromagnetic receiving intensity when the material 5 to be tested is not placed in the material presetting space 4, and under the control of the second testing module 8, the electromagnetic receiving device 2 obtains the parameter value of the second electromagnetic receiving intensity and the parameter value of the third electromagnetic receiving intensity when the material 5 to be tested is placed in the material presetting space 4, and then the determining module 7 determines the shielding effectiveness of the material 5 to be tested according to the obtained parameter value of the first electromagnetic receiving intensity, the obtained parameter value of the second electromagnetic receiving intensity and the obtained parameter value of the third electromagnetic receiving intensity. When the electromagnetic reception intensity is a voltage, the determining module 7 determines the shielding effectiveness of the material 5 to be measured according to the acquired parameter value of the first electromagnetic reception intensity, the acquired parameter value of the second electromagnetic reception intensity, and the acquired parameter value of the third electromagnetic reception intensity by:
SE(dB)＝20*log(V0/(V1-V2)) (1)
in the formula (1), SE is the shielding effectiveness, V0 represents the parameter value of the first electromagnetic reception intensity, V1 represents the parameter value of the second electromagnetic reception intensity, and V2 represents the parameter value of the third electromagnetic reception intensity. Therefore, the shielding effectiveness of the material to be tested 5 is obtained, and the embodiment of the invention has the advantages of strong operability, good convenience, low requirement on a testing device and no requirement on plane processing of the material to be tested.
The third embodiment of the present invention is an application example of the present invention, which is described in conjunction with fig. 1-2, on the basis of the above two embodiments.
After the test platform 1 is built, a test power supply 6 of the test platform 1 is connected, and the platform 1 to be tested is measured after working stably.
First, an electromagnetic receiving test is performed on the electromagnetic receiving device 2 in a free space, specifically, when the material 5 to be tested is not placed between the receiving antenna 21 of the electromagnetic receiving device 2 and the transmitting antenna 31 of the electromagnetic transmitting device 3, the electromagnetic signal source 33 is adjusted to a frequency point to be tested, the electromagnetic signal source 33 or the power amplifier 32 is adjusted to make the output level of the electromagnetic transmitting device 3 moderate, the electromagnetic receiving device 2 receives a radio frequency signal (i.e., an electromagnetic transmission intensity signal) radiated by the electromagnetic transmitting device 3, and when the reading of the parameter value of the first electromagnetic receiving intensity displayed on the receiving device 21 of the electromagnetic transmitting device 3 is greater than the required value or the estimated value of the shielding effectiveness of the material 5 to be tested, the reading V0 (unit is volt V) displayed on the receiving device 21 at this time is recorded.
Secondly, referring to fig. 3, vertically placing the material 5 to be measured between the receiving antenna 23 and the transmitting antenna 31, and making the material 5 to be measured close to the port surface of the receiving antenna 23, keeping the frequency and the output level of the electromagnetic signal source 33 unchanged, observing the reading of the receiving device 21, and recording the reading V1 (in volts V) displayed on the receiving device 21 when the reading of the parameter value of the second electromagnetic receiving intensity measured by the receiving device 21 is not less than the background noise of the receiving device 21.
And thirdly, attaching or coating a metal attaching layer on the surface of the material 5 to be detected, wherein in the embodiment of the invention, the metal attaching layer comprises copper foil, metal adhesive tape and metallic paint coating. The shielding effectiveness of the metal attaching layer with a certain thickness attached or coated is not less than the shielding effectiveness required value or estimated value of the material 5 to be tested by at least 10 dB;
fourthly, performing an electromagnetic receiving test on the material 5 to be tested to which the metal attaching layer is attached or coated, placing the material 5 to be tested to which the metal attaching layer is attached or coated between the receiving antenna 23 and the transmitting antenna 31, wherein the placing mode of the material 5 to be tested is consistent with the placing mode in the second step, keeping the frequency and the output level of the electromagnetic signal source 33 unchanged, observing the reading of the receiving device 21, and recording the reading V2 (the unit is volt V) of the receiving device 21 when the reading of the parameter value of the third electromagnetic receiving intensity measured by the receiving device 21 is not less than the background noise of the receiving device 21;
and fifthly, calculating the Shielding Effectiveness (SE) of the material 5 to be measured:
SE(dB)＝20*log(V0/(V1-V2)) (1)
and sixthly, changing the frequency of the electromagnetic signal source 33 so as to change the electromagnetic emission intensity radiated into the space by the emission antenna 31 of the electromagnetic emission device 3, and repeating the first to the fifth steps to measure the shielding effectiveness of the material 5 to be measured at different frequency points, thereby completing the test of the shielding effectiveness of the material 5 to be measured. The invention can test the non-planar material, solves the problems of the traditional method that the number of test equipment and devices is large, the planar processing and the compression joint fixing are needed to be carried out on the material to be tested, and has good convenience and low cost in the test process.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), and includes a plurality of instructions for controlling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A test method for testing shielding effectiveness of a material, comprising:
a material presetting space is arranged between the electromagnetic transmitting device and the electromagnetic receiving device which are oppositely arranged, and the material presetting space is used for placing a material to be detected;
modulating the electromagnetic emission intensity of the electromagnetic emission device radiation;
before the material to be tested is placed in the material preset space, the electromagnetic emission intensity is received through the electromagnetic receiving device so as to carry out a first electromagnetic receiving test;
when the material to be tested is placed in the material preset space, the electromagnetic emission intensity is received through the electromagnetic receiving device so as to carry out a second electromagnetic receiving test;
and determining the shielding effectiveness of the material to be tested according to the test results of the first electromagnetic receiving test and the second electromagnetic receiving test.
2. The method as claimed in claim 1, further comprising, after determining the shielding effectiveness of the material to be tested according to the test results of the first and second electromagnetic reception tests:
and modulating different electromagnetic emission intensities for the electromagnetic emission device to obtain the shielding effectiveness of the material to be detected on different electromagnetic emission intensities.
3. The method as claimed in claim 1, wherein the step of receiving the electromagnetic emission intensity by the electromagnetic receiving device for performing a first electromagnetic receiving test before the step of placing the material to be tested in the material pre-placing space comprises:
and converting the received electromagnetic emission intensity into a first electromagnetic receiving intensity through the electromagnetic receiving device, and acquiring a parameter value of the first electromagnetic receiving intensity when the first electromagnetic receiving intensity is greater than a required value or a predicted value of the shielding effectiveness of the material to be detected.
4. The method as claimed in claim 1, wherein the step of receiving the electromagnetic emission intensity by the electromagnetic receiving device to perform a second electromagnetic receiving test when the material to be tested is placed in the material pre-placing space comprises:
when the material to be detected is placed in the material preset space, the electromagnetic receiving device converts the received electromagnetic emission intensity into a second electromagnetic receiving intensity, and when the second electromagnetic receiving intensity is larger than the background noise of receiving equipment in the electromagnetic receiving device, a parameter value of the second electromagnetic receiving intensity is obtained;
and when the material to be detected with the metal attachment layer arranged on the surface is placed in the material preset space, the electromagnetic receiving device converts the received electromagnetic emission intensity into a third electromagnetic receiving intensity, and when the third electromagnetic receiving intensity is greater than the background noise of receiving equipment in the electromagnetic receiving device, the parameter value of the third electromagnetic receiving intensity is obtained.
5. The method as claimed in claims 3 and 4, wherein the determining the shielding effectiveness of the material to be tested according to the test results of the first electromagnetic receiving test and the second electromagnetic receiving test comprises:
and determining the shielding effectiveness of the material to be detected according to the acquired parameter value of the first electromagnetic receiving intensity, the acquired parameter value of the second electromagnetic receiving intensity and the acquired parameter value of the third electromagnetic receiving intensity.
6. The method according to claim 5, wherein the electromagnetic receiving intensity includes magnetic field intensity, electric field intensity, voltage and power;
when the electromagnetic receiving intensity is the voltage, the method for determining the shielding effectiveness of the material to be measured according to the acquired parameter value of the first electromagnetic receiving intensity, the acquired parameter value of the second electromagnetic receiving intensity, and the acquired parameter value of the third electromagnetic receiving intensity is as follows:
SE(dB)＝20*log(V0/(V1-V2)) (1)
in the formula (1), the SE is the shielding effectiveness, the V0 represents a parameter value of the first electromagnetic reception intensity, the V1 represents a parameter value of the second electromagnetic reception intensity, and the V2 represents a parameter value of the third electromagnetic reception intensity.
7. A test system for testing shielding effectiveness of a material, comprising:
the test device comprises a test platform, an electromagnetic transmitting device and an electromagnetic receiving device, wherein the electromagnetic transmitting device and the electromagnetic receiving device are oppositely arranged on the test platform;
the test platform comprises:
the modulation module is used for modulating the electromagnetic emission intensity radiated by the electromagnetic emission device;
the first test module is used for receiving the electromagnetic emission intensity through the electromagnetic receiving device to perform a first electromagnetic receiving test before the material to be tested is placed in the material preset space;
the second test module is used for receiving the electromagnetic emission intensity through the electromagnetic receiving device to perform a second electromagnetic receiving test when the material to be tested is placed in the material preset space;
and the determining module is used for determining the shielding effectiveness of the material to be tested according to the test results of the first electromagnetic receiving test and the second electromagnetic receiving test.
8. The test system for testing shielding effectiveness of a material of claim 7, wherein the modulation module is further configured to: and modulating different electromagnetic emission intensities for the electromagnetic emission device to obtain the shielding effectiveness of the material to be detected on different electromagnetic emission intensities.
9. The testing system for testing shielding effectiveness of a material as defined in claim 7,
the first test module is specifically configured to: converting the received electromagnetic emission intensity into a first electromagnetic receiving intensity through the electromagnetic receiving device, and acquiring a parameter value of the first electromagnetic receiving intensity when the first electromagnetic receiving intensity is greater than a required value or a predicted value of the shielding effectiveness of the material to be detected;
the second test module is specifically configured to: when the material to be detected is placed in the material preset space, the electromagnetic receiving device converts the received electromagnetic emission intensity into a second electromagnetic receiving intensity, and when the second electromagnetic receiving intensity is larger than the background noise of receiving equipment in the electromagnetic receiving device, a parameter value of the second electromagnetic receiving intensity is obtained; and when the material to be detected with the metal attachment layer arranged on the surface is placed in the material preset space, the electromagnetic receiving device converts the received electromagnetic emission intensity into a third electromagnetic receiving intensity, and when the third electromagnetic receiving intensity is larger than the background noise of receiving equipment in the electromagnetic receiving device, a parameter value of the third electromagnetic receiving intensity is obtained.
10. The testing system for testing shielding effectiveness of a material of claim 9, wherein the determining module is specifically configured to:
and determining the shielding effectiveness of the material to be detected according to the acquired parameter value of the first electromagnetic receiving intensity, the acquired parameter value of the second electromagnetic receiving intensity and the acquired parameter value of the third electromagnetic receiving intensity.
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