CN110702999A - Strong electromagnetic pulse shielding effectiveness test system and method - Google Patents
Strong electromagnetic pulse shielding effectiveness test system and method Download PDFInfo
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Abstract
The invention discloses a strong electromagnetic pulse shielding effectiveness test system, which comprises a strong electromagnetic pulse source, a test shielding cavity, a pulse field signal receiving loop and a pulse field signal compensation loop, wherein the test shielding cavity is provided with a test shielding cavity; a strong electromagnetic pulse source generates a strong electromagnetic pulse field in a microwave darkroom; a test window is arranged on the side surface of the test shielding cavity, the shielding cavity is arranged in the microwave darkroom, and one side of the shielding cavity, which is provided with the test window, is right opposite to the incoming wave direction; the pulse field signal receiving loop and the pulse field signal compensating loop comprise a receiving antenna/field probe, a signal transmission loop and signal display equipment; the receiving antenna/field probe is connected with the signal display device through the first signal transmission loop or the second signal transmission loop. In addition, the invention also discloses a method corresponding to the system. The invention fills the blank in the field of strong electromagnetic pulse shielding effectiveness test systems and methods. The test system of the invention has a large dynamic range and extremely high accuracy of test results.
Description
Technical Field
The invention belongs to the technical field of electromagnetic shielding material shielding effectiveness testing, and particularly relates to a strong electromagnetic pulse shielding effectiveness testing system and method.
Background
The shielding effectiveness is one of the most important performances of the electromagnetic shielding material, accurate testing and characterization of the shielding effectiveness are crucial to practical application of the shielding material, and especially with the emergence of strong electromagnetic pulse threats such as high-power microwaves and nuclear electromagnetic pulses in recent years, the normal operation of electronic equipment is threatened more, and strong electromagnetic pulse protection on the electronic equipment is urgently needed. Therefore, accurate characterization and testing of the shielding effectiveness of the shielding material under the condition of strong electromagnetic pulse is a key ring in the application of the shielding material to strengthening against strong electromagnetic pulse.
At present, a shielding effectiveness test method under a continuous wave small signal condition is mature, and national military standards/national standards such as GJB8820-2015 electromagnetic shielding material shielding effectiveness measurement method, GB30142-2013 planar electromagnetic shielding material shielding effectiveness measurement method and the like make clear regulations on a test method, system configuration, application range and the like. However, the above method is not suitable for the shielding effectiveness test under the condition of strong electromagnetic pulse. On the other hand, according to the reports of the influence of strong electromagnetic pulse on the Shielding performance of the material, the research on the wave absorbing material under the condition of strong electromagnetic pulse, the Shielding electromagnetic effect of energy absorption windows and HPM effects on coated windows, and the like, under the action of strong electromagnetic pulse, the material properties may be changed under the influence of strong electromagnetic field, thereby influencing the Shielding performance, and the test result under the condition of continuous wave small signal cannot completely reflect the Shielding performance of the material under the condition of strong electromagnetic pulse. On the other hand, strong electromagnetic pulses generally have the characteristics of fast rising edge, narrow pulse width, low duty ratio and the like, and equipment such as a spectrum analyzer, a spectrum analyzer with a tracking signal source, a network analyzer and the like suggested to be used in the standard is difficult to accurately and effectively acquire strong electromagnetic pulse signals, so that the problem of inaccurate measurement or incapability of testing is caused. Meanwhile, the strong electromagnetic pulse source output stability is generally not high, the signal jitter is large, and the accuracy of the test result is difficult to ensure only by using one set of signal monitoring loop. Therefore, the system and the method for testing the shielding effectiveness under the strong electromagnetic pulse condition are constructed, and the system and the method have important significance for the shielding effectiveness characterization and protection reinforcement application of the shielding material under the strong electromagnetic pulse condition.
Disclosure of Invention
The invention aims to solve the problem that the traditional shielding effectiveness testing method is difficult to meet the testing requirement of a shielding material under the condition of strong electromagnetic pulse, and provides a strong electromagnetic pulse shielding effectiveness testing system and method which are high in accuracy, large in dynamic range and simple and convenient to operate.
The purpose of the invention is realized by the following technical scheme:
a strong electromagnetic pulse shielding effectiveness test system comprises a strong electromagnetic pulse source, a test shielding cavity, a pulse field signal receiving circuit and a pulse field signal compensation circuit;
a strong electromagnetic pulse source generates a strong electromagnetic pulse field in a microwave darkroom; a test window is arranged on the side surface of the test shielding cavity, the shielding cavity is arranged in the microwave darkroom, and one side of the shielding cavity, which is provided with the test window, is right opposite to the incoming wave direction;
the pulse field signal receiving circuit comprises a receiving antenna/field probe, a first signal transmission circuit and signal display equipment, wherein the receiving antenna/field probe is arranged in the test shielding cavity; the receiving antenna/field probe is connected with the signal display equipment through a first signal transmission loop;
the pulse field signal compensation loop comprises a receiving antenna/field probe, a second signal transmission loop and signal display equipment, wherein the receiving antenna/field probe, the second signal transmission loop and the signal display equipment are arranged in the microwave darkroom; the receiving antenna/field probe is connected with the signal display device through a second signal transmission loop.
Preferably, the signal display device is disposed in the control room.
Preferably, the signal display devices of the pulsed field signal receiving circuit and the pulsed field signal compensation circuit are the same signal display device.
Preferably, the signal display device is an oscilloscope.
Preferably, the strong electromagnetic pulse source is nuclear electromagnetic pulse, narrow-band high-power microwave, broadband high-power microwave or ultra-wideband high-power microwave.
Preferably, the pulsed field signal receiving loop and the pulsed field signal compensating loop are microwave loops or optical fiber loops.
Preferably, when the pulsed field signal receiving circuit and the pulsed field signal compensation circuit are microwave circuits:
pulsed field signal receiving circuit: an attenuator, a power amplifier and a detector are arranged between the receiving antenna/field probe and the signal display equipment, the receiving antenna/field probe, the attenuator, the power amplifier and the detector are connected through a microwave cable, and the detector and the signal display equipment are connected through a BNC wire. Wherein, the power amplifier's effect does: when the shielding effectiveness of the shielding material to be detected is very high, the intensity of the pulse signal attenuated by the shielding material is smaller than the sensitivity of the detector, so that the pulse signal cannot be obtained, the power amplifier can amplify the microwave signal to make up for the problem of lower sensitivity when the detector modulates the microwave pulse signal, and the dynamic range of the system is improved; the attenuator plays a role in attenuating the microwave energy entering the power amplifier, and the situation that the wave detector is burnt due to overhigh signal energy amplified by the power amplifier is prevented;
pulse field signal compensation loop: an attenuator and a detector are arranged between the receiving antenna/field probe and the signal display equipment, the receiving antenna/field probe, the attenuator and the detector are connected through a microwave cable, and the detector and the signal display equipment are connected through a BNC (bayonet nut connector) line, wherein the receiving antenna/field probe is a compensation antenna/field probe. Wherein the attenuator plays a role of attenuating microwave energy to protect a signal display device (oscilloscope);
the pulse field signal receiving circuit and the pulse field signal compensating circuit are connected to the signal display equipment.
Preferably, when the pulsed field signal receiving loop and the pulsed field signal compensation loop are optical fiber loops:
pulsed field signal receiving circuit: a first electro-optical conversion module and a first photoelectric conversion module are arranged between the receiving antenna/field probe and the signal display equipment, the first electro-optical conversion module is arranged in the test shielding cavity, the first photoelectric conversion module is arranged in the control room, and the first electro-optical conversion module is connected with the first photoelectric conversion module through an optical fiber;
pulse field signal compensation loop: a second electro-optical conversion module and a second photoelectric conversion module are arranged between the receiving antenna/field probe and the signal display equipment, the second electro-optical conversion module is arranged in the microwave darkroom, the second photoelectric conversion module is arranged in the control room, and the second electro-optical conversion module is connected with the second photoelectric conversion module through an optical fiber;
the pulse field signal receiving circuit and the pulse field signal compensating circuit are connected to the signal display equipment.
A test method for the strong electromagnetic pulse shielding effectiveness of electromagnetic shielding materials by using the strong electromagnetic pulse shielding effectiveness test system is provided, wherein a pulse field signal receiving loop and a pulse field signal compensating loop are microwave loops, and the test method comprises the following steps:
firstly, calibrating attenuation values of a microwave cable and an attenuator, and calibrating the sensitivity of a detector;
calibrating the strong electromagnetic pulse field according to the test requirement, determining the test position, and recording the parameter configuration of the strong electromagnetic pulse source;
thirdly, placing the test shielding cavity at a field intensity calibration point, and simultaneously placing the pulse signal compensation antenna at one side of the test shielding cavity and fixing the position;
fourthly, operating the strong electromagnetic pulse source to radiate signals according to the calibration parameters, recording the voltage readings of the pulse field signal receiving circuit and the pulse field signal compensating circuit, and recording the voltage readings as V0And V0', while recording the attenuator attenuation value of the pulse field signal receiving circuit, denoted as R0；
Step five, mounting the sample to be tested on the test window, and operating strong electromagnetic pulseThe source radiates signals according to the calibration parameters, and the signal readings of the pulse field signal receiving circuit and the pulse field signal compensating circuit are recorded as V1And V1', simultaneously recording the attenuation value of the attenuator of the pulse field signal receiving loop, denoted as R1；
And step six, calculating the shielding effectiveness according to the data, wherein the calculation formula is as follows:
SE＝(A0+R0)-(A1ten R1)+(A′0-A′1) (1)
Wherein A is0、A0' detection values corresponding to voltage values of a pulse field signal receiving circuit and a pulse field signal compensating circuit when a sample to be measured is not placed in a test window, A1And A1The pulse field signal receiving circuit and the pulse field signal compensation circuit respectively correspond to the detection values when the tested sample is placed in the test window.
A test method for the strong electromagnetic pulse shielding effectiveness of electromagnetic shielding materials by using the strong electromagnetic pulse shielding effectiveness test system is characterized in that a pulse field signal receiving loop and a pulse field signal compensating loop are optical fiber loops; the test method comprises the following steps:
calibrating the sensitivity of an optical fiber loop (a receiving antenna/field probe, a first electro-optical conversion module, a first photoelectric conversion module, a compensation antenna/field probe, a second electro-optical conversion module, a second photoelectric conversion module);
calibrating the strong electromagnetic pulse field according to the test requirement, determining the test position, and recording the parameter configuration of the strong electromagnetic pulse source;
thirdly, placing the test shielding cavity at a field intensity calibration point, and simultaneously placing the pulse signal compensation antenna at one side of the test shielding cavity and fixing the position;
fourthly, operating the strong electromagnetic pulse source to radiate signals according to the calibration parameters, recording the voltage readings of the pulse field signal receiving circuit and the pulse field signal compensating circuit, and recording the voltage readings as v0And v0'；
Step five, mounting the sample to be tested on the test window, and operating the strong electromagnetic pulse source to pressSignal radiation is carried out according to the calibration parameters, and the signal readings of the pulse field signal receiving circuit and the pulse field signal compensating circuit are recorded as v1And v1'；
And step six, calculating the shielding effectiveness according to the data, wherein the calculation formula is as follows:
the invention has the beneficial effects that:
compared with the existing common shielding effectiveness testing device, the strong electromagnetic pulse shielding effectiveness testing system and method provided by the invention have the following advantages:
1. the strong electromagnetic pulse shielding effectiveness test system and the method provided by the invention fill the blank in the technical field of strong electromagnetic pulse shielding effectiveness test of materials, and provide a feasible system and a feasible method for the test in the field;
2. the power amplification module is added in the microwave loop, so that the problem that a microwave pulse signal cannot be obtained due to the sensitivity of a detector when the shielding effectiveness of the detected shielding material is high is solved, and the dynamic range of the system is greatly improved;
3. a field intensity compensation calibration loop is designed in the system, so that measurement errors caused by strong electromagnetic pulse source signal jitter can be effectively made up, and a test result has extremely high accuracy and reliability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of the system components when the signal receiving and compensation calibration loop is a microwave loop;
fig. 2 is a schematic diagram of the system when the signal receiving and compensating calibration loop is an optical fiber loop.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example one
As shown in fig. 1 and fig. 2, a strong electromagnetic pulse shielding effectiveness testing system includes a strong electromagnetic pulse source, a testing shielding cavity, a pulse field signal receiving circuit and a pulse field signal compensating circuit; the test shielding cavity is a sealing cavity body with a cubic structure and is made of cold-rolled steel plates, the length, the width and the height of the sealing cavity body are all 1.5m, and wave-absorbing materials are attached inside the cavity body to eliminate the influence of resonance on the test. One side of the shielding cavity is provided with a test window of 300mm multiplied by 300mm for placing a tested sample. The test shielding cavity is arranged on a movable bracket with adjustable height, so that the test shielding cavity can be conveniently adjusted to meet the test requirements of different strong electromagnetic pulse sources.
The strong electromagnetic pulse source generates a strong electromagnetic pulse field in the microwave darkroom; the test shielding cavity is arranged in the microwave darkroom, and one side of the test shielding cavity, which is provided with the test window, is right opposite to the incoming wave direction.
The pulse field signal receiving circuit comprises a receiving antenna/field probe, a first signal transmission circuit and signal display equipment, wherein the receiving antenna/field probe is arranged in the test shielding cavity; the receiving antenna/field probe is connected with the signal display device through a first signal transmission loop.
The pulse field signal compensation loop comprises a receiving antenna/field probe, a second signal transmission loop and signal display equipment, wherein the receiving antenna/field probe, the second signal transmission loop and the signal display equipment are arranged in the microwave darkroom; the receiving antenna/field probe is connected with the signal display device through a second signal transmission loop.
The signal display device is arranged in the control room. And the signal display equipment of the pulse field signal receiving circuit and the pulse field signal compensation circuit is the same signal display equipment. The signal display device is an oscilloscope.
The strong electromagnetic pulse source is nuclear electromagnetic pulse, narrow-band high-power microwave, broadband high-power microwave or ultra-wideband high-power microwave.
The pulse field signal receiving loop and the pulse field signal compensating loop are microwave loops or optical fiber loops.
As shown in fig. 1, when the pulsed field signal receiving loop and the pulsed field signal compensating loop are microwave loops:
pulsed field signal receiving circuit: an attenuator, a power amplifier and a detector are arranged between the receiving antenna/field probe and the signal display equipment, the receiving antenna/field probe, the attenuator, the power amplifier and the detector are connected through a microwave cable, and the detector and the signal display equipment are connected through a BNC wire. Wherein, the power amplifier's effect does: when the shielding effectiveness of the shielding material to be detected is very high, the intensity of the pulse signal attenuated by the shielding material is smaller than the sensitivity of the detector, so that the pulse signal cannot be obtained, the power amplifier can amplify the microwave signal to make up the problem of lower sensitivity when the detector modulates the microwave pulse signal, and the dynamic range of the system is improved; the attenuator plays the role of attenuating the microwave energy entering the power amplifier, and prevents the detector from being burnt due to overhigh signal energy amplified by the power amplifier.
Pulse field signal compensation loop: an attenuator and a detector are arranged between the receiving antenna/field probe and the signal display equipment, the receiving antenna/field probe, the attenuator and the detector are connected through a microwave cable, and the detector and the signal display equipment are connected through a BNC (bayonet nut connector) line, wherein the receiving antenna/field probe is a compensation antenna/field probe. Among other things, the attenuator functions to attenuate microwave energy to protect the signal display device (oscilloscope).
The pulse field signal receiving circuit and the pulse field signal compensating circuit are connected to the signal display equipment. As shown in fig. 2, when signals are transmitted through optical fibers, corresponding parts can be changed on the basis of the original test system shown in fig. 1, the receiving antenna/field probe is connected with the electro-optical conversion module, the microwave cable is replaced by the optical fibers, and the attenuator and the detector are replaced by the photoelectric conversion module. Namely, when the pulse field signal receiving loop and the pulse field signal compensating loop are optical fiber loops:
pulsed field signal receiving circuit: a first electro-optical conversion module and a first photoelectric conversion module are arranged between the receiving antenna/field probe and the signal display equipment, the first electro-optical conversion module is arranged in the test shielding cavity, the first photoelectric conversion module is arranged in the control chamber, and the first electro-optical conversion module is connected with the first photoelectric conversion module through an optical fiber.
Pulse field signal compensation loop: a second electro-optical conversion module and a second photoelectric conversion module are arranged between the receiving antenna/field probe (fig. 2 is a compensation antenna/field probe) and the signal display device, the second electro-optical conversion module is arranged in the microwave darkroom, the second photoelectric conversion module is arranged in the control room, and the second electro-optical conversion module is connected with the second photoelectric conversion module through an optical fiber;
the pulse field signal receiving circuit and the pulse field signal compensating circuit are connected to the signal display equipment.
Example two
A test method for the strong electromagnetic pulse shielding effectiveness of electromagnetic shielding materials by using the strong electromagnetic pulse shielding effectiveness test system is provided, wherein a pulse field signal receiving loop and a pulse field signal compensating loop are microwave loops, and the test method comprises the following steps:
firstly, calibrating attenuation values of a microwave cable and an attenuator, and calibrating the sensitivity of a detector;
calibrating the strong electromagnetic pulse field according to the test requirement, determining the test position, and recording the parameter configuration of the strong electromagnetic pulse source;
thirdly, placing the test shielding cavity at a field intensity calibration point, and simultaneously placing the pulse signal compensation antenna at one side of the test shielding cavity and fixing the position; erecting a pulse signal compensation antenna at a fixed position on the side surface of the test shielding cavity, and displaying a compensation signal through an oscilloscope after the compensation signal is transmitted through a microwave cable, attenuated by an attenuator and modulated by a detector;
fourthly, operating the strong electromagnetic pulse source to radiate signals according to the calibration parameters, recording the voltage readings of the pulse field signal receiving circuit and the pulse field signal compensating circuit, and recording the voltage readings as V0And V0', while recording the attenuator attenuation value of the pulse field signal receiving circuit, denoted as R0；
Fifthly, mounting the sample to be tested on a test window, operating a strong electromagnetic pulse source to radiate signals according to calibration parameters, and recording the signal readings of a pulse field signal receiving circuit and a pulse field signal compensating circuit as V1And V1', simultaneously recording the attenuation value of the attenuator of the pulse field signal receiving loop, denoted as R1；
And step six, calculating the shielding effectiveness according to the data, wherein the calculation formula is as follows:
SE＝(A0+R0)-(A1+R1)+(A′0-A′1) (1)
wherein A is0、A0' detection values corresponding to voltage values of a pulse field signal receiving circuit and a pulse field signal compensating circuit when a sample to be measured is not placed in a test window, A1And A1The pulse field signal receiving circuit and the pulse field signal compensation circuit respectively correspond to the detection values when the tested sample is placed in the test window.
The system is used for carrying out shielding effectiveness test on the electromagnetic shielding material under the condition of strong electromagnetic pulse, and the shielding effectiveness of the tested sample is calculated by the calculation formula (1).
EXAMPLE III
A test method for the strong electromagnetic pulse shielding effectiveness of electromagnetic shielding materials by using the strong electromagnetic pulse shielding effectiveness test system is characterized in that a pulse field signal receiving loop and a pulse field signal compensating loop are optical fiber loops; the test method comprises the following steps:
calibrating the sensitivity of an optical fiber loop (a receiving antenna/field probe, a first electro-optical conversion module, a first photoelectric conversion module, a compensation antenna/field probe, a second electro-optical conversion module, a second photoelectric conversion module);
calibrating the strong electromagnetic pulse field according to the test requirement, determining the test position, and recording the parameter configuration of the strong electromagnetic pulse source;
thirdly, placing the test shielding cavity at a field intensity calibration point, and simultaneously placing the pulse signal compensation antenna at one side of the test shielding cavity and fixing the position;
fourthly, operating the strong electromagnetic pulse source to radiate signals according to the calibration parameters, recording the voltage readings of the pulse field signal receiving circuit and the pulse field signal compensating circuit, and recording the voltage readings as v0And v0'；
Fifthly, mounting the sample to be tested on a test window, operating a strong electromagnetic pulse source to radiate signals according to calibration parameters, and recording the signal readings of a pulse field signal receiving circuit and a pulse field signal compensating circuit as v1And v1'；
And step six, calculating the shielding effectiveness according to the data, wherein the calculation formula is as follows:
compared with the traditional shielding effectiveness testing device, the invention fills the technical blank of the strong electromagnetic pulse shielding effectiveness testing system and method, in addition, the power amplification module is added in the microwave loop, thereby effectively solving the problem that the microwave pulse signal cannot be obtained due to the sensitivity of a detector when the shielding effectiveness of the tested shielding material is very large, greatly improving the dynamic range of the system, simultaneously, the field intensity compensation calibration loop is designed in the shielding effectiveness testing system, thereby effectively making up the measurement error caused by the jitter of the strong electromagnetic pulse source signal, and the testing result has extremely high accuracy and reliability.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, it should be noted that any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A strong electromagnetic pulse shielding effectiveness test system is characterized in that: the test device comprises a strong electromagnetic pulse source, a test shielding cavity, a pulse field signal receiving circuit and a pulse field signal compensation circuit;
a strong electromagnetic pulse source generates a strong electromagnetic pulse field in a microwave darkroom; a test window is arranged on the side surface of the test shielding cavity, the shielding cavity is arranged in the microwave darkroom, and one side of the shielding cavity, which is provided with the test window, is right opposite to the incoming wave direction;
the pulse field signal receiving circuit comprises a receiving antenna/field probe, a first signal transmission circuit and signal display equipment, wherein the receiving antenna/field probe is arranged in the test shielding cavity; the receiving antenna/field probe is connected with the signal display equipment through a first signal transmission loop;
the pulse field signal compensation loop comprises a receiving antenna/field probe, a second signal transmission loop and signal display equipment, wherein the receiving antenna/field probe, the second signal transmission loop and the signal display equipment are arranged in the microwave darkroom; the receiving antenna/field probe is connected with the signal display device through a second signal transmission loop.
2. A strong electromagnetic pulse shielding effectiveness testing system according to claim 1, wherein: the signal display device is arranged in the control room.
3. A strong electromagnetic pulse shielding effectiveness testing system according to claim 1, wherein: and the signal display equipment of the pulse field signal receiving circuit and the pulse field signal compensation circuit is the same signal display equipment.
4. A strong electromagnetic pulse shielding effectiveness testing system according to claim 1, wherein: the signal display device is an oscilloscope.
5. A strong electromagnetic pulse shielding effectiveness testing system according to claim 1, wherein: the strong electromagnetic pulse source is nuclear electromagnetic pulse, narrow-band high-power microwave, broadband high-power microwave or ultra-wideband high-power microwave.
6. A strong electromagnetic pulse shielding effectiveness testing system according to claim 1, wherein: the pulse field signal receiving loop and the pulse field signal compensating loop are microwave loops or optical fiber loops.
7. A strong electromagnetic pulse shielding effectiveness test system according to claim 6, characterized in that: when the pulse field signal receiving circuit and the pulse field signal compensating circuit are microwave circuits;
pulsed field signal receiving circuit: an attenuator, a power amplifier and a detector are arranged between the receiving antenna/field probe and the signal display equipment, the receiving antenna/field probe, the attenuator, the power amplifier and the detector are connected through a microwave cable, and the detector and the signal display equipment are connected through a BNC wire;
pulse field signal compensation loop: an attenuator and a detector are arranged between the receiving antenna/field probe and the signal display equipment, the receiving antenna/field probe, the attenuator and the detector are connected through a microwave cable, and the detector and the signal display equipment are connected through a BNC (bayonet nut connector) line, wherein the receiving antenna/field probe is a compensating antenna/field probe;
the pulse field signal receiving circuit and the pulse field signal compensating circuit are connected to the signal display equipment.
8. A strong electromagnetic pulse shielding effectiveness test system according to claim 6, characterized in that: when the pulse field signal receiving loop and the pulse field signal compensating loop are optical fiber loops;
pulsed field signal receiving circuit: a first electro-optical conversion module and a first photoelectric conversion module are arranged between the receiving antenna/field probe and the signal display equipment, the first electro-optical conversion module is arranged in the test shielding cavity, the first photoelectric conversion module is arranged in the control room, and the first electro-optical conversion module is connected with the first photoelectric conversion module through an optical fiber;
pulse field signal compensation loop: a second electro-optical conversion module and a second photoelectric conversion module are arranged between the receiving antenna/field probe and the signal display equipment, the second electro-optical conversion module is arranged in the microwave darkroom, the second photoelectric conversion module is arranged in the control room, and the second electro-optical conversion module is connected with the second photoelectric conversion module through an optical fiber;
the pulse field signal receiving circuit and the pulse field signal compensating circuit are connected to the signal display equipment.
9. A method for testing strong electromagnetic pulse shielding effectiveness of an electromagnetic shielding material by using the strong electromagnetic pulse shielding effectiveness testing system according to any one of claims 1 to 8, wherein: the pulse field signal receiving circuit and the pulse field signal compensating circuit are microwave circuits, and the testing method comprises the following steps:
firstly, calibrating attenuation values of a microwave cable and an attenuator, and calibrating the sensitivity of a detector;
calibrating the strong electromagnetic pulse field according to the test requirement, determining the test position, and recording the parameter configuration of the strong electromagnetic pulse source;
thirdly, placing the test shielding cavity at a field intensity calibration point, and simultaneously placing the pulse signal compensation antenna at one side of the test shielding cavity and fixing the position;
fourthly, operating the strong electromagnetic pulse source to radiate signals according to the calibration parameters, recording the voltage readings of the pulse field signal receiving circuit and the pulse field signal compensating circuit, and recording the voltage readings as V0And V0', while recording the attenuator attenuation value of the pulse field signal receiving circuit, denoted as R0；
Step five, to be testedThe sample is arranged on the test window, the strong electromagnetic pulse source is operated to radiate signals according to the calibration parameters, and the signal readings of the pulse field signal receiving circuit and the pulse field signal compensating circuit are recorded as V1And V1', simultaneously recording the attenuation value of the attenuator of the pulse field signal receiving loop, denoted as R1；
And step six, calculating the shielding effectiveness according to the data, wherein the calculation formula is as follows:
SE＝(A0+R0)-(A1+R1)+(A′0-A′1) (1)
wherein A is0、A0' detection values corresponding to voltage values of a pulse field signal receiving circuit and a pulse field signal compensating circuit when a sample to be measured is not placed in a test window, A1And A1The pulse field signal receiving circuit and the pulse field signal compensation circuit respectively correspond to the detection values when the tested sample is placed in the test window.
10. A method for testing strong electromagnetic pulse shielding effectiveness of an electromagnetic shielding material by using the strong electromagnetic pulse shielding effectiveness testing system according to any one of claims 1 to 8, wherein: the pulse field signal receiving loop and the pulse field signal compensating loop are optical fiber loops; the test method comprises the following steps:
firstly, calibrating the sensitivity of an optical fiber loop;
calibrating the strong electromagnetic pulse field according to the test requirement, determining the test position, and recording the parameter configuration of the strong electromagnetic pulse source;
thirdly, placing the test shielding cavity at a field intensity calibration point, and simultaneously placing the pulse signal compensation antenna at one side of the test shielding cavity and fixing the position;
fourthly, operating the strong electromagnetic pulse source to radiate signals according to the calibration parameters, recording the voltage readings of the pulse field signal receiving circuit and the pulse field signal compensating circuit, and recording the voltage readings as v0And v0'；
Step five, mounting the sample to be tested on the test window, and operating the strong electromagnetic pulse source according to the calibration parametersSignal radiation, recording of the signal readings of the pulse field signal receiving circuit and the pulse field signal compensating circuit are recorded as v1And v1'；
And step six, calculating the shielding effectiveness according to the data, wherein the calculation formula is as follows:
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| CN111624425A (en) * | 2020-05-29 | 2020-09-04 | 北京无线电计量测试研究所 | System and method for measuring shielding efficiency of electromagnetic pulse signal |
| CN111983341A (en) * | 2020-07-15 | 2020-11-24 | 中国工程物理研究院应用电子学研究所 | Signal preprocessing module for strong electromagnetic pulse shielding effectiveness test and system thereof |
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| CN111624425A (en) * | 2020-05-29 | 2020-09-04 | 北京无线电计量测试研究所 | System and method for measuring shielding efficiency of electromagnetic pulse signal |
| CN111983341A (en) * | 2020-07-15 | 2020-11-24 | 中国工程物理研究院应用电子学研究所 | Signal preprocessing module for strong electromagnetic pulse shielding effectiveness test and system thereof |
| CN111983341B (en) * | 2020-07-15 | 2023-01-20 | 中国工程物理研究院应用电子学研究所 | Signal preprocessing module for strong electromagnetic pulse shielding effectiveness test and system thereof |
| CN112130004A (en) * | 2020-09-25 | 2020-12-25 | 中国工程物理研究院应用电子学研究所 | Circuit-level high-power microwave back-door coupling real-time testing device and method |
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| CN112596010A (en) * | 2020-11-26 | 2021-04-02 | 中国航空工业集团公司沈阳飞机设计研究所 | Energy selection surface electromagnetic performance test device and method thereof |
| CN112578192A (en) * | 2020-12-30 | 2021-03-30 | 北京无线电计量测试研究所 | Time domain pulse shielding effectiveness testing device and method for small shielding body |
| CN112649693A (en) * | 2021-01-15 | 2021-04-13 | 公安部第三研究所 | Multi-dimensional electromagnetic interference visual automatic detection system and method under high and low temperature environment |
| CN113391153A (en) * | 2021-06-18 | 2021-09-14 | 深圳市精泰达科技有限公司 | Automatic alignment test system and test method for 5G millimeter wave shielding box |
| CN113533883A (en) * | 2021-06-29 | 2021-10-22 | 中国工程物理研究院应用电子学研究所 | System and method for testing electromagnetic shielding effectiveness of artificial material based on common-aperture antenna array |
| CN113533883B (en) * | 2021-06-29 | 2023-06-23 | 中国工程物理研究院应用电子学研究所 | Artificial material electromagnetic shielding effectiveness test system and method based on common aperture antenna array |
| CN113899962A (en) * | 2021-08-24 | 2022-01-07 | 中国工程物理研究院应用电子学研究所 | System and method for testing high-power microwave protection efficiency of rear door protection device |
| CN113899962B (en) * | 2021-08-24 | 2023-04-25 | 中国工程物理研究院应用电子学研究所 | System and method for testing high-power microwave protection efficiency of back door protection device |
| CN113495247A (en) * | 2021-09-08 | 2021-10-12 | 中国工程物理研究院应用电子学研究所 | High-power microwave effect evaluation system and method for general investigation direction-finding system |
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| CN114184834B (en) * | 2021-10-26 | 2023-05-23 | 中国工程物理研究院应用电子学研究所 | High-power microwave protection performance test system and method for electromagnetic protection device with high confidence |
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