CN111551814B - Method for testing electromagnetic environment effect of monitoring system in variable-rising-edge wide-pulse electric field environment - Google Patents
Method for testing electromagnetic environment effect of monitoring system in variable-rising-edge wide-pulse electric field environment Download PDFInfo
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Abstract
The invention discloses a method for testing the electromagnetic environment effect of a monitoring system in a variable-rising-edge wide-pulse electric field environment, which utilizes a steep inductance, an adjustable inductance and a low-inductance short circuit line to be matched with a pulse steep device to realize the continuous adjustment of the rising edge of a radiation field from ns magnitude to mu s magnitude; the problem of simultaneous testing of the rising edge and the pulse width of the electric field waveform is solved by utilizing a sensitivity self-calibration electric field probe and electric field data automatic acquisition and analysis software; the method solves the problem of calibrating the test field intensity and the rising edge of the bounded wave simulator in different areas by utilizing a null field linear calibration method, provides a specific test method and operation steps of the monitoring system environmental effect, can ensure the normalization and the rationality of the monitoring system electromagnetic environmental effect test in a low-bandwidth pulsed electric field environment, and can improve the accuracy of the monitoring system electromagnetic environmental effect test.
Description
Technical Field
The invention belongs to the field of an electromagnetic environment effect test method of an electronic system, and particularly relates to an electromagnetic environment effect test method of a monitoring system under a variable-rising-edge wide-pulse electric field environment.
Background
The utility model discloses a rise along adjustable wide pulse strong electric field analogue means has been proposed in ZL201820312470.5 analogue means of a fast rise along wide pulse strong electric field environment, can produce the strong electric field waveform of 0 ~ 50ns within range adjustable pulse rise along and millisecond pulse width. However, the analog range of the rising edge of this device is too narrow, and the device needs to be improved for low frequency electric fields (rising edge in hundreds of ns to mus). In addition, the difference between the rising edge and the pulse width of the waveform generated by the device is several orders of magnitude, the test capability of the current universal electric field probe and the current oscilloscope is considered, the precise test of the rising edge and the pulse width cannot be realized simultaneously by using one set of electric field probe and the oscilloscope, and the waveform test and analysis method of the simulation device is a problem which needs to be solved urgently in the actual use process.
In the invention patent ZL201510020231.3 electromagnetic environment effect experiment method of electronic equipment in a bounded wave environment, the electromagnetic environment effect experiment method and steps of the electronic equipment of a bounded wave electric field simulator are standardized, and different test areas of the equipment are divided, but the patent does not specify how the field intensity of different areas is tested in the test process: if the method of simultaneously testing the field intensity probe and the equipment is adopted, the existence of the equipment can generate great influence on the testing field waveform of the field intensity probe, so that the testing data is inaccurate; if the field intensity conversion is directly carried out according to different heights, no specific operation method and requirements are given in the patent.
The monitoring system comprises equipment such as a hard disk video recorder, a display screen, a video camera and a network cable, is commonly used for monitoring and recording the internal environment of a project or the running condition of the equipment in the project, and provides guarantee for the normal running of the whole project. The diversity of their coupling channels also makes the system highly susceptible to electromagnetic interference or damage. The existing published documents have few research reports on electromagnetic interference or damage of monitoring systems, and the test requirements, methods and steps of the monitoring systems are not specified yet.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for testing the electromagnetic environment effect of a monitoring system under the environment of a variable-rising-edge (continuously adjustable from nanosecond magnitude to microsecond magnitude) wide-pulse electric field.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for testing the electromagnetic environment effect of a monitoring system in a variable-rising-edge wide-pulse electric field environment is characterized by comprising the following steps:
(1) selecting a connection mode of a monitoring system and tested equipment specifically arranged in a test area as required, arranging the tested equipment on a wooden placing table, setting the tested equipment right facing the incoming wave direction of a radiation field, keeping the network cables vertically arranged (if the network cables exist), and simulating the vertical pole of the radiation waveIrradiation status under chemical conversion, which is recorded as status A1j(j ═ 1), continuously adjusting and changing the field intensity amplitude and the rising edge of the radiation field, utilizing a measuring probe to perform real-time test of radiation field parameters, sequentially performing irradiation tests under different amplitude values and different rising edge conditions, observing the effect phenomenon of the tested equipment, and recording the corresponding lowest field intensity peak value and the corresponding rising edge value when the tested equipment is interfered;
(2) keeping the relative state of the equipment in the step (1) unchanged, integrally moving the tested equipment side to the incoming wave direction, and recording the state as A2j(j ═ 1), carrying out an irradiation test according to the mode in the step (1), and recording a corresponding lowest field intensity peak value and a corresponding rising edge value when the tested equipment is interfered;
(3) keeping the relative state of the equipment in the step (1) unchanged, integrally moving the tested equipment back to the incoming wave direction, and recording the state as A3j(j ═ 1), carrying out an irradiation test according to the mode in the step (1), and recording a corresponding lowest field intensity peak value and a corresponding rising edge value when the tested equipment is interfered;
(4) according to the setting in the step (1), all the tested devices are placed upside down, the horizontal polarization condition is simulated, and the situation is recorded as a state B1j(j ═ 1), carrying out an irradiation test according to the mode in the step (1), and recording a corresponding lowest field intensity peak value and a corresponding rising edge value when the tested equipment is interfered;
(5) keeping the relative state of the equipment in the step (4) unchanged, integrally moving the tested equipment side to the incoming wave direction, and recording the state as B2j(j ═ 1), carrying out an irradiation test according to the mode in the step (4), and recording a corresponding lowest field intensity peak value and a corresponding rising edge value when the tested equipment is interfered;
(6) keeping the relative state of the equipment in the step (4) unchanged, integrally moving the tested equipment back to the incoming wave direction, and recording the state as B3j(j ═ 1), carrying out an irradiation test according to the mode in the step (4), and recording a corresponding lowest field intensity peak value and a corresponding rising edge value when the tested equipment is interfered;
(7) changing the working conditions of the tested equipment (such as the length of a connecting wire, a connecting mode and the like, or sequentially shielding different parts in the tested equipment by using a shielding box or a steel pipe) according to the most sensitive test posture of the tested equipment determined in the steps (1) to (6), wherein the change of the working state is characterized by changing a subscript j (j is 2,3 … … n), and determining the interference effect rule of the equipment in different setting states, and the lowest field intensity peak value and the corresponding rising edge value corresponding to the interference according to the mode in the step (1);
(8) selecting the lowest field intensity peak value and the corresponding rising edge in the steps (1) - (7) as an interference threshold of the sample, setting the tested equipment according to the corresponding tested state, sequentially performing irradiation tests under different amplitude values and different rising edge conditions, observing the influence of the irradiation tests on the damage effect result, and recording the lowest field intensity peak value and the corresponding rising edge when the damage occurs, namely the damage threshold of the tested equipment;
(9) replacing the sample, and repeating the steps (1) to (8);
(10) and (4) comprehensively comparing and analyzing the test phenomena and the test data recorded in the steps (1) to (9) to determine the interference/damage threshold range of the variable rising edge wide pulse electric field on the monitoring system.
In addition to the above test protocol, the number of times of repeating the test in each of the above steps (1) to (9) should not be less than 3.
On the basis of the test scheme, the radiation field measuring probe in the step (1) comprises two sets of electric field probes with the same performance, one set of electric field probes is fixedly arranged in the test area, and the other set of electric field probes is arranged in the test area according to the tested equipment.
On the basis of the test scheme, the electric field probes are two probes with sensitivity self-calibration functions, the two electric field probes are placed on a wooden placing table in a test area, a monitoring camera is used for observing test scenes of the test area and specific test phenomena of equipment, and the two probes are matched with an automatic electric field data acquisition and analysis tool to realize simultaneous test and analysis of the rising edge and the pulse width of an electric field waveform.
On the basis of the test scheme, the electric field probe carries out signal transmission through the optical fiber, the optical signal is transmitted into the photoelectric conversion module and then outputs an electric signal, the output end of the photoelectric conversion module is connected with the oscilloscope through the coaxial line, the electric signal is transmitted into the oscilloscope, the industrial personal computer reads the test data of the oscilloscope in real time through the GPIB connecting line, and the test result is displayed on the display interface of the electric field data automatic acquisition and analysis tool.
On the basis of the above test scheme, the irradiation test in adopt and become to rise along wide pulse electric field simulator pulse sharpening device and produce the radiation field, the device includes pulse generator system, pulse sharpening device and radiation line structure, pulse generator system output is connected with pulse sharpening device, pulse sharpening device links to each other with the radiation line structure, pulse sharpening device includes sharpening pulse capacitor and sharpening output switch, concatenates between sharpening pulse capacitor and the pulse generator system and adjusts the inductance, concatenates between sharpening output switch and the radiation line structure and steeps the inductance, low inductance line short circuit steeps output switch.
On the basis of the test scheme, the inductance of the low-inductance short-circuit line is less than 500nH, and the low-inductance short-circuit line is connected to two ends of the sharpening output switch to carry out switch short circuit.
On the basis of the test scheme, the steepening inductor and the regulating inductor are formed by winding high-voltage wires, and can be wound into a series of inductors with different inductance values according to requirements so as to obtain different rising edges of the radiation field in a matching manner.
On the basis of the test scheme, the tested equipment comprises a camera, a switch, a hard disk video recorder, an electro-optical conversion module, a photoelectric conversion module and a display, and the camera has the following three connection modes according to test requirements: 1: the camera, the electro-optical conversion module, the photoelectric conversion module, the switch, the hard disk video recorder and the display are connected in series; 2: camera-switch-hard disk recorder-display; 3: camera-video recorder-display.
The test area may house one or more of the devices under test on the basis of the test protocol described above.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
(1) in the invention, the electric field simulation device provided in patent ZL201820312470.5 simulation device for strong electric field environment with fast rising edge and wide pulse is improved by matching the sharpening inductor, the regulating inductor and the low-inductance short circuit line with the pulse sharpening device, so that the rising edge of the radiation field can be continuously regulated from ns magnitude to mu s magnitude;
(2) the invention utilizes two sets of sensitivity self-calibration electric field probes and electric field data automatic acquisition and analysis software to solve the problem of simultaneous testing and analysis of the rising edge and the pulse width of the radiation electric field waveform;
(3) the invention solves the problem of calibrating the test field intensity and the rising edge of the bounded wave simulator in different areas by using an empty field linear calibration method, can reduce the influence of a test probe on the environmental field intensity of the tested equipment, and improves the field intensity test accuracy;
(4) the method and the operation steps for testing the electromagnetic environment effect of the monitoring system in the variable-rising-edge wide-pulse electric field environment can ensure the normalization and the rationality of the electromagnetic environment effect test of the monitoring system in the variable-rising-edge wide-pulse electric field environment and can improve the accuracy of the electromagnetic environment effect test of the monitoring system. The invention has the advantages of clear order, strong pertinence, easy realization and the like.
Drawings
FIG. 1 is a schematic diagram of a pulse steepening device of a variable rising edge wide pulse electric field simulator according to the present invention;
FIG. 2 is a connection diagram of an electric field measurement probe;
FIG. 3 is a schematic diagram of bounded wave simulator trial area division;
FIG. 4 is a schematic diagram of the test apparatus layout;
FIG. 5 is a schematic diagram of the detailed connection of the test apparatus;
in the figure: 1. a pulse generator system; 2. a pulse sharpening device; 3. a radiation line structure; 4. sharpening the pulse capacitor; 5. steepening the output switch; 6. adjusting the inductance; 7. a low-inductance short circuit line; 8. sharpening the inductor; 9. an industrial personal computer; 10. an oscilloscope; 11. a photoelectric conversion module; 12. a first electric field probe; 13. a second electric field probe; 14. a dual mode optical fiber; 15. GPIB connection; 16. a coaxial line; 17. a device under test; 18. a wooden placing table; 19. a terminal load; 20. a surveillance camera; 21. a radiation source; 22. shielding the measurement room; 23. a radiation source control system; 24. a device under test control and monitoring system; 25. a device under test control line; 26. a switch; 27. a display; 28. a hard disk video recorder; 29. an electro-optical conversion module; 30. a camera; 31. a network cable; 32. and (4) wireless communication.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention discloses a method for testing the electromagnetic environment effect of a monitoring system under a wide-pulse strong electric field environment with variable rising edge (continuously adjustable from ns magnitude to mu s magnitude), which utilizes a sharpening inductor 8, an adjusting inductor 6 and a low-inductance short-circuit line 7 to be matched with a pulse sharpening device 2 to realize the continuous adjustment of the rising edge of a radiation field from ns magnitude to mu s magnitude.
Fig. 1 is a schematic diagram of an arrangement of a variable rising edge wide pulse electric field simulator pulse sharpening device according to the present invention, the device includes a pulse generator system 1, a pulse sharpening device 2 and a radiation structure 3, an output of the pulse generator system 1 is connected with the pulse sharpening device 2, the pulse sharpening device 2 is connected with the radiation structure 3, the pulse sharpening device 2 includes a sharpening pulse capacitor 4 and a sharpening output switch 5, an adjusting inductor 6 is connected in series between the sharpening pulse capacitor 4 and the pulse generator system 1, and a sharpening inductor 8 is connected in series between the sharpening output switch 5 and the radiation structure 3. Before the test, according to the rising edge characteristic of the radiation field to be realized, the rising edge of the radiation field is continuously adjusted from ns magnitude to mu s magnitude by utilizing the sharpening inductor 8, the regulating inductor 6 and the low-inductance short-circuit line 7 to be matched with the pulse sharpening device 2. Connecting a sharpening inductor 8 between a sharpening output switch 5 and a radiation line structure 3, adjusting the size of the rising edge of a radiation field to obtain the rising edge in the range of 0-240 ns, and at the moment, adjusting the inductor 6 and a low-inductance short circuit line 7 not to be connected into a system; the output switch 5 is short-circuited and steeped by using a low-inductance short-circuit line 7, and the regulating inductor 6 is connected in series between the pulse generator system 1 and the pulse steepening device 2, the rising edge of the radiation field is regulated to obtain the rising edge in the range of more than 240ns, and the steepening inductor 8 is not connected into the system at the moment. Therefore, the rising edge of the radiation field is continuously adjusted from ns magnitude to mu s magnitude by utilizing the sharpening inductor 8, the regulating inductor 6 and the low-inductance short-circuit line 7 to be matched with the pulse sharpening device 2. In practical application, the sharpening inductor 8 and the regulating inductor 6 are wound by high-voltage wires and are wound into a series of inductors with different inductance values according to requirements so as to obtain different rising edges of the radiation field in a matching manner. Tests show that the inductance of the low-inductance short-circuit line 7 is 450nH, and the low-inductance short-circuit line is connected to two ends of the sharpening output switch 5 to carry out switch short circuit according to requirements.
In actual test, two sets of sensitivity self-calibration electric field probes and electric field data automatic acquisition and analysis software are used for matching to simultaneously test the rising edge and the pulse width of an electric field waveform. The sensitivity self-calibration electric field probe utilizes the dual-mode optical fiber 14 to transmit signals, self-calibrates the sensitivity of the electric field probe before testing, eliminates the drift of the test sensitivity of the probe caused by environmental influence, ensures the accuracy of the test, and controls the calibration action by one key of a sensitivity calibration button on electric field data automatic acquisition and analysis software; the sensitivity self-calibration electric field probe carries out signal transmission through a dual-mode optical fiber 14, an optical signal is transmitted into a photoelectric conversion module 11 and then outputs an electric signal, the output end of the photoelectric conversion module 11 is connected with an oscilloscope 10 through a coaxial line 16, the electric signal is transmitted into the oscilloscope 10, an industrial personal computer 9 reads test data of the oscilloscope 10 in real time through a GPIB (general purpose interface bus) connecting line 15, and a test result is displayed on a display interface of electric field data automatic acquisition and analysis software.
The invention utilizes a sensitivity self-calibration electric field probe and electric field data automatic acquisition and analysis software to solve the problem of simultaneous testing of the rising edge and the pulse width of the electric field waveform. FIG. 2 is a connection diagram of an electric field measurement probe, wherein the fastest rising edge measurable by the electric field probe I12 is less than 2ns, the pulse width is 0.1 mu s, and the electric field probe I is specially used for testing the waveform of the rising edge; the second electric field probe 13 can measure the fastest rising edge 5ns, the pulse width is more than 1ms, and the second electric field probe is specially used for testing the full waveform (particularly the pulse width). The data results of the two test probes are transmitted to the photoelectric conversion module 11 through the dual-mode optical fiber 14 and converted into electric signals, then the electric signals are transmitted to the oscilloscope 10 through the coaxial line 16, and then the electric signals are transmitted to the industrial personal computer 9 through the GPIB connecting line 15 to read the test data of the oscilloscope 10 in real time, and the test results are displayed on the display interface of the automatic electric field data acquisition and analysis software.
Due to the limitation of the response characteristic of the electric field probe I12, the rising edge of the electric field wave form of the radiation is displayed correctly, and the pulse width or full wave form is displayed unrealistically. And the second electric field probe 13 displays the pulse width of the waveform of the radiation electric field correctly due to the limitation of the response characteristic of the second electric field probe, and displays the rising edge in a non-detailed and non-accurate manner. The electric field data automatic acquisition and analysis software carries out non-uniform resampling on the test data of the two probes (the sampling rate of the rising edge is set according to the sampling rate of the probe 1, the sampling rate of the subsequent waveform is set according to the sampling rate of the probe 2), then the re-fitting and drawing are carried out on the resampled data to obtain a complete radiation field waveform, the subsequent data processing such as frequency spectrum analysis and parameter extraction is carried out on the basis of the resampled data, and key parameters such as the rising edge, the pulse width, the falling edge, the duration, the peak value and the like can be displayed on an interface in real time.
Two sets of electric field probes with the same performance are used, one set of electric field probes is fixedly arranged in a test area, and the other set of electric field probes is arranged according to a test area to be arranged in the tested equipment. Before formal test, the positions of the two probes are fixed, and the test results of the two probes under typical field intensity are analyzed to obtain a field intensity calibration coefficient, a rising edge calibration coefficient and the like (considering that the pulse width is in ms magnitude, the change of different test areas of the simulator is not large, so that the calibration is not carried out). In the formal test, a probe is arranged in a test area and is fixed, only tested equipment is arranged in the test area, and parameters such as radiation field intensity of the tested equipment are obtained by calibrating a test result of the probe arranged in the test area by a calibration coefficient.
The tested equipment 17 is placed on the wooden placing table 18, and the texture of the wooden placing table 18 is dry, so that the radiation field environment is not influenced. The height of the wood placing table 18 can ensure that the tested device 17 is in the center of the uniform field test zone. Two electric field probes are placed on a first test area wooden placing table 18 at a distance of 50cm, and a monitoring camera is utilized to monitor test scenes 20 of a test field area and the specific test phenomenon of equipment. The remaining control and monitoring equipment, except the dual mode fiber 14 and transmission lines, is all located in the shielded measurement room 22. The shielding measurement room 22 satisfies the electric field shielding effectiveness of more than 80dB and the magnetic field shielding effectiveness of more than 60 dB.
Before the tested device 17 starts the test, the field intensity calibration is firstly carried out on different test areas of the simulator to obtain different testsField intensity calibration coefficient k of test areaiAnd a rise time calibration coefficient tiThe index i (i ═ 1,2 … m) characterizes the number of test areas. Two sets of electric field probes I12 and two sets of electric field probes II 13 are subjected to a test under different applied voltages, wherein one set of probes are always placed in a test area and are fixed differently, the distance between the two probes is 0.5m, the field intensity and the rising edge reading of the electric field probes in different test areas under different applied voltages (the specific applied voltage range is determined according to the test requirement of tested equipment 17, the height of a simulator in the test is 3m, the applied voltage is 0-300 kV, and the maximum field intensity can be formed to be 100kV/m) are recorded, and the field intensity calibration coefficients k of the fixed probes in the different test areas and the test area are obtained through data processingiAnd a rise time calibration coefficient tiIn actual tests, the actual radiation field intensity and the rising edge of the device under test 17 are ki*E1And ti*tr1In which E1And tr1The results of the measurement of the radiation field strength and the rising edge of a test area are respectively.
The monitoring system of the invention utilizes the monitoring camera 20 to transmit signals to the photoelectric conversion module 11 positioned in the shielding measurement room 22 through the dual-mode optical fiber 14, and output signals are displayed on the display 27 in real time after passing through the switch 26 and the hard disk video recorder 28. The actual tested equipment 17 is arranged as shown in figure 4, the first electric field probe 12 and the second electric field probe 13 are placed in a first test area at a distance of 0.5m and used as standard field intensity parameters in the test process, the two probes pass through the dual-mode optical fiber 14 and then are transmitted into the photoelectric conversion module 11 positioned in the shielding measurement room 22, then are transmitted into the oscilloscope 10 through the photoelectric conversion module 11 and are transmitted into the industrial personal computer 9 through the GPIB connecting wire 15, and the test result is displayed by automatic electric field data acquisition and analysis software. After being connected in a certain connection mode shown in fig. 5, the device under test 17 is placed in a test area, and the distribution characteristics of the radiation field intensity of the bounded waves are considered, and the device under test is sequentially pushed from a test area to a test area at the end of the radiation source 21 according to the requirement that the field intensity is increased from small to large. The working state of the tested equipment 17 is controlled and detected by a tested equipment control and monitoring system 24 positioned in the shielding measuring room 22, and a real-time picture is displayed through a display 27. The working state of the radiation source 21 is controlled in real time by a radiation source control system 23 located in the shield measurement room 22. The monitoring of the whole test scene is carried out in real time by a monitoring camera 20 which is positioned above the test area (the distance is enough to ensure that the radiation wave influences the test area), and the monitoring camera is transmitted to a photoelectric conversion module 11 positioned in a shielding measurement room 22 through a dual-mode optical fiber 14 to output an electric signal, and then the electric signal is displayed in real time by a display 27 after passing through an exchanger 26 and a hard disk video recorder 28.
In the above, the device under test 17 includes a camera 30, a switch 26, a hard disk recorder 28, an electro-optical conversion module 29, an electro-optical conversion module 11, a display 27, and the like, and the camera 30 may adopt different connection modes according to test requirements, as shown in fig. 5. Connection mode 1: the camera 30, the electro-optical conversion module 29, the photoelectric conversion module 11, the switch 26, the hard disk video recorder 28 and the display 27; connection mode 2: camera 30-switch 26-hard disk video recorder 28-display 27; connection mode 3: camera 30-hard disk recorder 28-display 27. Depending on the testing requirements, the testing area may house one or more of the devices under test 17 to perform the tests on the particular different devices.
The device under test 17 is connected by one of the above connection methods, taking the Haekwover DS-2DC24021W-D3/W model 400 ten thousand pixel network infrared spherical camera 30 as an example, the camera 30 can be connected by a network cable 31, and connected by a dual-mode optical fiber 14 or connected by a wireless communication 32 after passing through a relay optical converter 29. The camera 30 is connected in one of the three manners (when the network cable 31 is connected, the camera 30 is connected to the switch 26, the Haokang Wigner DS-7808NB-K2 hard disk video recorder 28 and the display 27 through the Anokang AMC657305 network cable 31, when the dual-mode optical fiber is connected 14, the camera 30 is connected to the electro-optical conversion module 29 through the Anokang AMC657305 network cable 31, and then the photoelectric conversion module 11, the switch 26, the Haokang Wigner DS-7808-K2 hard disk video recorder NB 28 and the display 27 are connected through the dual-mode optical fiber 14. when the wireless communication 32 is connected, the camera 30 and the Kangwei DS-7808NB-K2 hard disk video recorder 28 establish wireless network communication, and result display is directly carried out through the display 27). the size of the actually tested equipment 17 is considered to be small, and if the test area is enough, three sets of tested equipment 17 can be used for carrying out tests simultaneously in different connection manners.
The main indexes of the variable rising edge wide pulse electric field environment which can be generated in the test are as follows: the radiation field is a double-exponential pulse signal, the rising edge of a pulse electric field can be continuously adjusted from ns magnitude to mu s magnitude, the full width at half maximum of the pulse can be adjusted to be not less than 1ms, the electric field intensity can be adjusted to be not less than 100kV/m, the height of the simulator radiation line structure 3 is 3m, the length of the simulator radiation line structure is 3.6m, and the width of the simulator radiation line structure is 3.6 m.
The invention discloses a method for testing the electromagnetic environment effect of a monitoring system in a variable-rising-edge wide-pulse electric field environment, which comprises the following specific steps:
(1) obtaining field intensity calibration coefficients k under different regions according to different test region field intensity and rising edge calibration methodsiAnd a rise time calibration coefficient ti；
(2) Placing a first test electric field probe 12 and a second test electric field probe 13 in a first test area according to the requirements, wherein the first test area and the second test area are different in fixation, and the distance between the two probes is 0.5 m;
(3) selecting a monitoring system connection mode and tested equipment 17 specifically arranged in a test area as required, arranging the tested equipment 17/system on a wood placing table 18, setting the tested equipment 17/system to be opposite to the incoming wave direction of a radiation field, keeping a network cable 31 vertically arranged (if the network cable 31 exists), simulating the irradiation state of the radiation wave under vertical polarization, and marking the irradiation state as a state A at the moment1j(j is 1), continuously adjusting and changing the field intensity amplitude and the rising edge of the radiation source, sequentially carrying out irradiation tests under the conditions of different amplitudes and different rising edges, observing the effect phenomenon of the tested equipment 17, and recording the corresponding lowest field intensity peak value E when the equipment/system is interferedA1jAnd corresponding rising edge value TA1j；
(4) Keeping the relative state of the equipment/system in the step (3) unchanged, and moving the equipment/system side pair as a whole (marked as state A)2j(j ═ 1)) direction of incoming wave, at this time, the irradiation test is carried out in the mode of step (3), and the lowest field intensity peak value E corresponding to the interfered recording equipment/system is recordedA2jAnd corresponding rising edge value TA2j；
(5) Keeping the relative state of the equipment/system in the step (3) unchanged, and enabling the whole mobile equipment/system to be back-to-back (marked as state A)3j(j＝1) In the direction of incoming waves, then, the irradiation test is carried out according to the mode in the step (3), and the corresponding lowest field intensity peak value E is recorded when the equipment/system is interferedA3jAnd corresponding rising edge value TA3j；
(6) All devices under test 17/systems are placed upside down (simulating horizontal polarization) according to the settings in step (3), and this time is recorded as state B1j(j is 1), carrying out an irradiation test according to the mode in the step (3), and recording the corresponding lowest field intensity peak value E when the equipment/system is interferedB1jAnd corresponding rising edge value TB1j；
(7) Keeping the relative device status in step (6) unchanged, and moving the device/system side pair as a whole (noted as status B)2j(j ═ 1)) direction of incoming wave, at this time, the irradiation test is carried out in the mode of step (6), and the lowest field intensity peak value E corresponding to the interfered recording equipment/system is recordedB2jAnd corresponding rising edge value TB2j；
(8) Keeping the relative state of the equipment/system in the step (6) unchanged, and enabling the whole mobile equipment/system to be back-to-back (marked as state B)3j(j ═ 1)) direction of incoming wave, at this time, the irradiation test is carried out in the mode of step (6), and the lowest field intensity peak value E corresponding to the interfered recording equipment/system is recordedB3jAnd corresponding rising edge value TB3j；
(9) And (3) comparing the lowest field intensity peak values obtained in the steps (3) to (8), taking the tested posture of the tested equipment 17/system corresponding to the lowest field intensity peak value as the most sensitive tested posture, changing the working conditions of the equipment/system (such as the length of a connecting wire, the connecting mode and the like, or sequentially shielding different parts in the tested equipment by using a shielding box or a steel pipe), and representing the change of the working state by changing the subscript j (j is 2,3 … n). Determining the interference effect rule of the equipment/system under different setting states and the corresponding lowest field intensity peak value E when the equipment/system is interfered in the same way in the step (2)XjAnd corresponding rising edge value TXj；
(10) And (4) selecting the lowest field intensity peak value and the corresponding rising edge in the steps (3) to (9) as the interference threshold of the sample, setting the tested equipment 17 according to the corresponding tested state, sequentially performing irradiation tests under different amplitude values and different rising edge conditions, observing the influence of the irradiation tests on the damage effect result, and recording the lowest field intensity peak value and the corresponding rising edge when the damage occurs, namely the damage threshold of the tested equipment. Thus, a sample interference/impairment threshold is determined;
(11) replacing the sample, and repeating the steps (3) to (10);
(12) and (4) comprehensively comparing and analyzing the test phenomena and the test data recorded in the steps (3) to (10) to determine the interference/damage threshold range of the variable rising edge wide pulse electric field on the monitoring system.
In the above tests, in the steps (3) to (11), before each test, the sensitivity calibration button on the electric field data automatic acquisition and analysis software needs to be used for one-key calibration of the test sensitivity of the electric field probe, so as to ensure the accuracy of each test result;
in the above test, in the steps (3) to (11), the test area of the device under test can be changed continuously according to the requirement of the test field strength;
in the above tests, in the steps (3) to (11), the radiation field intensity actually received by the device under test 17 needs to be calibrated according to the field intensity calibration coefficient k in the step (1)iAnd a rise time calibration coefficient tiTo determine that the actual radiation field strength and the rising edge of the device under test 17 are ki*E1And ti*tr1In which E1And tr1Respectively measuring the radiation field intensity and the rising edge of a test area;
in the above-described tests, the number of times of repetition test in each of the above-described steps (3) to (11) should not be less than 3.
The electric field data automatic acquisition and analysis software in the scheme is compiled by VC + +, can be interconnected and communicated with the oscilloscope 10, reads data acquired by the oscilloscope 10 in real time through the GPIB connecting wire 15, and can realize functions of resampling the data, analyzing frequency spectrum, analyzing parameters, displaying waveforms in real time and the like.
By adopting the technical scheme, the invention has the following advantages:
(1) in the invention, the electric field simulation device provided in patent ZL201820312470.5 simulation device for strong electric field environment with fast rising edge and wide pulse is improved by matching the sharpening inductor, the regulating inductor and the low-inductance short circuit line with the pulse sharpening device, so that the rising edge of the radiation field can be continuously regulated from ns magnitude to mu s magnitude;
(2) the invention utilizes two sets of sensitivity self-calibration electric field probes and electric field data automatic acquisition and analysis software to solve the problem of simultaneous testing and analysis of the rising edge and the pulse width of the radiation electric field waveform;
(3) the invention solves the problem of calibrating the test field intensity and the rising edge of the bounded wave simulator in different areas by using an empty field linear calibration method, can reduce the influence of a test probe on the environmental field intensity of the tested equipment, and improves the field intensity test accuracy;
(4) the method and the operation steps for testing the electromagnetic environment effect of the monitoring system in the variable-rising-edge wide-pulse electric field environment can ensure the normalization and the rationality of the electromagnetic environment effect test of the monitoring system in the variable-rising-edge wide-pulse electric field environment and can improve the accuracy of the electromagnetic environment effect test of the monitoring system. The invention has the advantages of clear order, strong pertinence, easy realization and the like.
Claims (7)
1. A method for testing the electromagnetic environment effect of a monitoring system in a variable-rising-edge wide-pulse electric field environment is characterized by comprising the following steps:
(1) selecting a monitoring system connection mode and test equipment specifically arranged in a test area as required, arranging the test equipment on a wood placing table, setting the test equipment right facing the incoming wave direction of a radiation field, keeping the network cables vertically arranged, simulating the irradiation state of the radiation wave under vertical polarization, and recording the irradiation state as a state A1j(j ═ 1), continuously adjusting and changing the field intensity amplitude and the rising edge of the radiation field, utilizing a measuring probe to perform real-time test of radiation field parameters, sequentially performing irradiation tests under different amplitude values and different rising edge conditions, observing the effect phenomenon of the tested equipment, and recording the corresponding lowest field intensity peak value and the corresponding rising edge value when the tested equipment is interfered; the measuring probe comprises two sets of electric field probes with the same performance, one set of electric field probe is fixedly arranged in the test area, and the other set of electric field probe is arranged according to a tested objectAn electric field probe is placed in a test area of the device; the electric field probes are two probes with sensitivity self-calibration functions, the two electric field probes are placed on a wooden placing table in a test area, a monitoring camera is used for observing test scenes of the test area and specific test phenomena of equipment, and the two probes are matched with an automatic electric field data acquisition and analysis tool to realize simultaneous test and analysis of a rising edge and a pulse width of an electric field waveform; the irradiation test is characterized in that a variable-rising-edge wide-pulse electric field simulator pulse sharpening device is adopted to generate a radiation field, the device comprises a pulse generator system (1), a pulse sharpening device (2) and a radiation line structure (3), the output of the pulse generator system (1) is connected with the pulse sharpening device (2), the pulse sharpening device (2) is connected with the radiation line structure (3), the pulse sharpening device (2) comprises a sharpening pulse capacitor (4) and a sharpening output switch (5), an adjusting inductor (6) is connected between the sharpening pulse capacitor (4) and the pulse generator system (1) in series, a sharpening inductor (8) is connected between the sharpening output switch (5) and the radiation line structure (3) in series, and a low-inductance short-circuit line (7) short-circuits the sharpening output switch (5);
(2) keeping the relative state of the equipment in the step (1) unchanged, integrally moving the tested equipment side to the incoming wave direction, and recording the state as A2j(j ═ 1), carrying out an irradiation test according to the mode in the step (1), and recording a corresponding lowest field intensity peak value and a corresponding rising edge value when the tested equipment is interfered;
(3) keeping the relative state of the equipment in the step (1) unchanged, integrally moving the tested equipment back to the incoming wave direction, and recording the state as A3j(j ═ 1), carrying out an irradiation test according to the mode in the step (1), and recording a corresponding lowest field intensity peak value and a corresponding rising edge value when the tested equipment is interfered;
(4) according to the setting in the step (1), all the tested devices are placed upside down, the horizontal polarization condition is simulated, and the situation is recorded as a state B1j(j ═ 1), carrying out an irradiation test according to the mode in the step (1), and recording a corresponding lowest field intensity peak value and a corresponding rising edge value when the tested equipment is interfered;
(5) keeping the relative state of the equipment in the step (4) unchanged, integrally moving the tested equipment side to the incoming wave direction, and recording the state as B2j(j ═ 1), as in step (4)Carrying out an irradiation test in a mode, and recording a lowest field intensity peak value and a corresponding rising edge value corresponding to the interference of the tested equipment;
(6) keeping the relative state of the equipment in the step (4) unchanged, integrally moving the tested equipment back to the incoming wave direction, and recording the state as B3j(j ═ 1), carrying out an irradiation test according to the mode in the step (4), and recording a corresponding lowest field intensity peak value and a corresponding rising edge value when the tested equipment is interfered;
(7) changing the working conditions of the tested equipment (such as the length of a connecting wire, a connecting mode and the like, or sequentially shielding different parts in the tested equipment by using a shielding box or a steel pipe) according to the most sensitive test posture of the tested equipment determined in the steps (1) to (6), wherein the change of the working state is characterized by changing a subscript j (j is 2,3 … … n), and determining the interference effect rule of the equipment in different setting states, and the lowest field intensity peak value and the corresponding rising edge value corresponding to the interference according to the mode in the step (1);
(8) selecting the lowest field intensity peak value and the corresponding rising edge in the steps (1) - (7) as an interference threshold of the sample, setting the tested equipment according to the corresponding tested state, sequentially performing irradiation tests under different amplitude values and different rising edge conditions, observing the influence of the irradiation tests on the damage effect result, and recording the lowest field intensity peak value and the corresponding rising edge when the damage occurs, namely the damage threshold of the tested equipment;
(9) replacing the sample, and repeating the steps (1) to (8);
(10) and (4) comprehensively comparing and analyzing the test phenomena and the test data recorded in the steps (1) to (9) to determine the interference/damage threshold range of the variable rising edge wide pulse electric field on the monitoring system.
2. The method for testing the electromagnetic environment effect of the monitoring system in the environment of the variable-rising-edge wide-pulse electric field according to claim 1, wherein in the steps (1) to (9), the number of repeated tests in each state is not less than 3.
3. The method for testing the electromagnetic environment effect of the monitoring system under the variable rising edge wide pulse electric field environment according to claim 1, wherein the electric field probe performs signal transmission through a dual-mode optical fiber (14), an optical signal is transmitted into a photoelectric conversion module (11) and then outputs an electrical signal, the output end of the photoelectric conversion module (11) is connected with an oscilloscope (10) through a coaxial line (16), the electrical signal is transmitted into the oscilloscope (10), an industrial personal computer (9) reads test data of the oscilloscope (10) in real time through a GPIB (general purpose interface bus) connecting line (15), and a test result is displayed on a display interface of an electric field data automatic acquisition and analysis tool.
4. The method for testing the electromagnetic environment effect of the monitoring system in the environment of the variable rising edge and the wide pulse electric field according to claim 1, wherein the inductance of the low-inductance short-circuit line (7) is less than 500nH, and the low-inductance short-circuit line (7) is connected to two ends of the steepening output switch (5) for switching short circuit.
5. The method for testing the electromagnetic environment effect of the monitoring system under the environment of the variable-rising-edge wide-pulse electric field according to claim 4, wherein the sharpening inductor (8) and the adjusting inductor (6) are formed by winding high-voltage wires, and can be wound into a series of inductors with different inductance values according to requirements so as to obtain different rising edges of the radiation field in a matching manner.
6. The method for testing the electromagnetic environment effect of the monitoring system in the environment of the variable rising edge and the wide pulse electric field according to claim 1, wherein the tested device comprises a camera, a switch, a hard disk video recorder, an electro-optical conversion module and a display, and the camera has the following three connection modes according to test requirements: 1: the camera, the electro-optical conversion module, the photoelectric conversion module, the switch, the hard disk video recorder and the display are connected in series; 2: camera-switch-hard disk recorder-display; 3: camera-video recorder-display.
7. The method of claim 6, wherein one or more of the devices under test can be placed in the test area.
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