CN116707665B - Radio frequency electromagnetic energy explosion test device and method - Google Patents
Radio frequency electromagnetic energy explosion test device and method Download PDFInfo
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- CN116707665B CN116707665B CN202310986885.6A CN202310986885A CN116707665B CN 116707665 B CN116707665 B CN 116707665B CN 202310986885 A CN202310986885 A CN 202310986885A CN 116707665 B CN116707665 B CN 116707665B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0087—Monitoring; Testing using service channels; using auxiliary channels using auxiliary channels or channel simulators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0892—Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3912—Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region
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- Spectroscopy & Molecular Physics (AREA)
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Abstract
The application discloses a radio frequency electromagnetic energy explosion test device and a method, wherein the device comprises: sealing the gas cavity; the antenna assembly comprises an antenna body, wherein two ends of the antenna body are respectively and electrically connected with a conductive disc and a metal disc; the gap adjusting assembly comprises a linear driving mechanism, wherein the linear driving mechanism is connected with a metal rod, one end of the metal rod penetrates through the metal disc, and the distance between the end of the metal rod and the conductive disc is an electric gap; during the test, explosive gas is filled in the sealed gas cavity, the antenna assembly obtains radio frequency electromagnetic energy, the linear driving mechanism drives the metal rod to be close to or far away from the conductive disc to change the distance, so that the gap minimum breakdown voltage corresponding to each gap distance is obtained, and the mapping relation between the gap minimum breakdown voltage and the gap distance is established. The application can obtain the minimum breakdown voltage of the gap corresponding to different gap distances under a specific frequency band, thereby providing data support for theoretical analysis of plasma discharge under high-frequency conditions and explosive environments.
Description
Technical Field
The application belongs to the technical field of wireless communication, and particularly relates to a radio frequency electromagnetic energy explosion test device and method.
Background
The safety performance test of radio frequency electromagnetic energy equipment in an explosive environment is an important ring for guaranteeing the safe operation of the equipment. At present, an IEC (International Electrotechnical Commission ) standard spark table is used for testing radio frequency electromagnetic energy fed in equipment with the frequency band below 30MHz, and popularizing a test conclusion to be applicable to equipment with the frequency band between 9kHz and 60 GHz.
However, for high-frequency devices, such as 5G devices, the rf electromagnetic energy required for different gap spacings may be different in a particular frequency band, and thus the above criteria directly apply the test conclusion of the low frequency band to the high frequency band, which has an inaccurate problem.
Disclosure of Invention
The embodiment of the application provides a radio frequency electromagnetic energy explosion test device and a radio frequency electromagnetic energy explosion test method, which are used for obtaining the gap minimum breakdown voltage corresponding to different gap distances under a specific frequency band at least to a certain extent by establishing a mapping relation between the gap minimum breakdown voltage and the gap distance, namely obtaining radio frequency electromagnetic energy required by different gap distances, so that data support is provided for theoretical analysis of plasma discharge under high-frequency and explosive gas conditions.
Other features and advantages of the application will be apparent from the following detailed description, or may be learned by the practice of the application.
According to a first aspect of an embodiment of the present application, there is provided a radio frequency electromagnetic energy explosion test apparatus comprising:
sealing the gas cavity;
the antenna assembly is arranged in the sealed gas cavity and comprises an antenna body, wherein two ends of the antenna body are respectively and electrically connected with a conductive disc and a metal disc, and the conductive disc and the metal disc are oppositely arranged;
the gap adjusting assembly is arranged in the sealed gas cavity and comprises a linear driving mechanism, the linear driving mechanism is connected with a metal rod, one end of the metal rod penetrates through the metal disc, and the distance between the end of the metal rod and the conductive disc is an electric gap;
when a radio frequency electromagnetic energy explosion test is carried out, explosive gas is filled in the closed gas cavity, the antenna assembly is used for acquiring radio frequency electromagnetic energy, the linear driving mechanism is used for driving the metal rod to be close to or far away from the conductive disc so as to change the interval of the electric gap, so that the gap minimum breakdown voltage corresponding to each gap interval is acquired, and the mapping relation between the gap minimum breakdown voltage and the gap interval is established.
In some embodiments of the application, based on the foregoing, the conductive pad is electrically connected to a feed electrode for electrically connecting to a radio frequency source for feeding radio frequency electromagnetic energy.
In some embodiments of the present application, based on the foregoing, the antenna body adopts a loop antenna, and the feed electrode includes a coaxial cable, and an impedance of the coaxial cable is matched with an impedance of the antenna body.
In some embodiments of the application, based on the foregoing scheme, the conductive plate is a cadmium plate, and the metal rod is a tungsten lead screw.
In some embodiments of the present application, based on the foregoing, the linear driving mechanism includes a driving motor, and a motion conversion mechanism is connected to an output end of the driving motor, and the motion conversion mechanism is connected to the metal rod, and is configured to convert a rotational driving force output by the driving motor into a linear driving force for driving the metal rod to perform a translational motion.
In some embodiments of the application, based on the foregoing, the motion conversion mechanism is a crank block mechanism.
In some embodiments of the present application, based on the foregoing solution, the gas-tight cavity is provided with a pressure relief port, and the pressure relief port is plugged with a sealing element.
In some embodiments of the present application, based on the foregoing, the linear driving mechanism is further configured to drive the metal rod to be periodically connected to the conductive disc, so as to determine, as a power safety threshold, a power of the rf electromagnetic energy at the time of explosion when the explosive gas is exploded during a step-up of the power of the rf electromagnetic energy obtained by the antenna assembly.
According to a second aspect of embodiments of the present application, there is provided a radio frequency electromagnetic energy explosion test method applied to the apparatus according to any one of the first aspects, the method comprising:
filling explosive gas into the closed gas cavity;
acquiring radio frequency electromagnetic energy through an antenna assembly;
controlling the linear driving mechanism to drive the metal rod to be close to or far away from the conductive disc so as to change the distance between the electric gaps;
and acquiring a gap minimum breakdown voltage corresponding to each gap interval, and establishing a mapping relation between the gap minimum breakdown voltage and the gap interval.
In some embodiments of the present application, based on the foregoing scheme, the method further includes:
controlling the linear driving mechanism to drive the metal rod to be periodically connected with the conductive disc;
gradually increasing the power of the radio frequency electromagnetic energy acquired by the antenna assembly;
when the explosive gas explodes, the radio frequency electromagnetic energy power at the time of explosion is determined as a power safety threshold.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
According to the radio frequency electromagnetic energy explosion test device provided by one or more embodiments of the application, the linear driving mechanism is arranged to drive the metal rod to be close to or far from the conductive disc so as to change the gap spacing between the end part of the metal rod and the conductive disc, and the mapping relation between the gap minimum breakdown voltage and the gap spacing can be established by acquiring the gap minimum breakdown voltage corresponding to each gap spacing, so that the gap minimum breakdown voltage corresponding to different gap spacing, namely the radio frequency electromagnetic energy required by different gap spacing, is known under a specific frequency band, and data support is provided for theoretical analysis of plasma discharge under high frequency and explosive gas conditions.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:
FIG. 1 shows a schematic structural diagram of a radio frequency electromagnetic energy explosion test device in an embodiment of the application;
FIG. 2 shows a schematic external structure of a radio frequency electromagnetic energy explosion test apparatus in an embodiment of the present application;
FIG. 3 illustrates a front view of a radio frequency electromagnetic energy explosion testing apparatus in an embodiment of the present application;
FIG. 4 illustrates a top view of a radio frequency electromagnetic energy explosion test apparatus in an embodiment of the present application;
FIG. 5 is a schematic view showing the structure of components in a gas-tight chamber in an embodiment of the present application;
fig. 6 shows a schematic structural diagram of a loop antenna in an embodiment of the present application;
FIG. 7 is a schematic diagram showing the connection structure of a loop antenna and a tungsten wire rod in an embodiment of the application;
fig. 8 shows a flow chart of a radio frequency electromagnetic energy explosion test method in an embodiment of the application.
Wherein, 1-the gas cavity is sealed; 2-an antenna body; 3-conductive plates; 4-metal disc; 5-a linear drive mechanism; 51-driving a motor; 52-a motion conversion mechanism; 6-a metal rod; 7-feeding electrode; 8-a pressure relief port; 9-an intake valve; 10-an air outlet valve; 11-an antenna mount; 12-sealing cover.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the application may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the application.
The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
Electromagnetic waves are both carriers of information and energy. Under certain conditions, radio frequency electromagnetic energy can cause impact ionization and corona discharge in normal air. Rf devices used in explosive environments, such as 5G base stations and WIFI devices, where electromagnetic energy in the space is at risk of igniting the explosive gas, although the electric field strength needs to reach the megavolt level to break down the air, which is normally difficult to achieve, electromagnetic field energy can produce a very large electric field strength with a small voltage in a very small gap, thus breaking down the air discharge with a small energy value. Therefore, if the mapping relation between different gap distances and the gap minimum breakdown voltage can be known, the method has important significance for theoretical analysis of plasma discharge under the conditions of high frequency and explosive gas.
Referring to fig. 1 to 7, fig. 1 is a schematic structural view showing a radio frequency electromagnetic energy explosion test apparatus in an embodiment of the present application; FIG. 2 shows a schematic external structure of a radio frequency electromagnetic energy explosion test apparatus in an embodiment of the present application; FIG. 3 illustrates a front view of a radio frequency electromagnetic energy explosion testing apparatus in an embodiment of the present application; FIG. 4 illustrates a top view of a radio frequency electromagnetic energy explosion test apparatus in an embodiment of the present application; FIG. 5 is a schematic view showing the structure of components in a gas-tight chamber in an embodiment of the present application; fig. 6 shows a schematic structural diagram of a loop antenna in an embodiment of the present application; fig. 7 shows a schematic diagram of a connection structure between a loop antenna and a tungsten wire rod in an embodiment of the application.
As shown in fig. 1 to 5, based on the above, according to a first aspect of an embodiment of the present application, there is provided a radio frequency electromagnetic energy explosion test apparatus, including:
sealing the gas chamber 1;
the antenna assembly is arranged in the airtight gas cavity 1 and comprises an antenna body 2, two ends of the antenna body 2 are respectively and electrically connected with a conductive disc 3 and a metal disc 4, and the conductive disc 3 and the metal disc 4 are oppositely arranged to form an electric gap;
the gap adjusting assembly is arranged in the airtight gas cavity 1 and comprises a linear driving mechanism 5, the linear driving mechanism 5 is connected with a metal rod 6, one end of the metal rod 6 is arranged on the metal disc 4 in a penetrating mode, and the distance between the end of the metal rod 6 and the conductive disc 3 is an electric gap;
when the radio frequency electromagnetic energy explosion test is performed, the closed gas cavity 1 is filled with explosive gas, the antenna assembly is used for acquiring radio frequency electromagnetic energy, the linear driving mechanism 5 is used for driving the metal rod 6 to be close to or far away from the conductive disc 3 so as to change the interval of the electric gap, so that the gap minimum breakdown voltage corresponding to each gap interval is acquired, and the mapping relation between the gap minimum breakdown voltage and the gap interval is established.
The principle of the radio frequency electromagnetic energy explosion test device of the embodiment of the application is as follows: the linear driving mechanism 5 is controlled to drive the metal rod 6 to be close to or far away from the conductive disc 3, and the metal rod 6 is arranged on the metal disc 4 in a penetrating manner, so that the electric gap between the conductive disc 3 and the metal rod 6 is changed in the process that the metal rod 6 is close to or far away from the conductive disc 3, and the electric gap is adjustable. For example: setting a fixed step length, the linear driving mechanism 5 drives the metal rod 6 to gradually approach the conductive disc 3 from the metal disc 4 according to the preset step length, so that the gap distance between the metal rod 6 and the conductive disc 3 is gradually reduced, namely, the initial electric gap between the metal rod 6 and the conductive disc 3 can be the distance between the conductive disc 3 and the metal disc 4, the tail end electric gap between the metal rod 6 and the conductive disc 3 can be zero, and at the moment, the metal rod 6 is translated to be in contact with the conductive disc 3. And under the gap spacing corresponding to each step length, gradually increasing the voltage between the gaps until the gaps are broken down, obtaining the minimum breakdown voltage corresponding to the breakdown of the gaps, and so on until the mapping relation between each gap spacing and the minimum breakdown voltage of the gaps is established, wherein the minimum breakdown voltage of the gaps can be obtained by calculation through radio frequency electromagnetic energy fed into the antenna component.
Based on the above disclosure, the beneficial effects of the embodiment of the application are as follows: by arranging the linear driving mechanism 5, the metal rod 6 is driven to be close to or far away from the conductive disc 3 so as to change the gap spacing between the end part of the metal rod 6 and the conductive disc 3, and the mapping relation between the gap minimum breakdown voltage and the gap spacing can be established by acquiring the gap minimum breakdown voltage corresponding to each gap spacing, so that the gap minimum breakdown voltage corresponding to different gap spacing under a specific frequency band is known, namely the radio frequency electromagnetic energy required by different gap spacing is known, and data support is provided for theoretical analysis of plasma discharge under high frequency and explosive gas conditions.
In some implementations of the embodiment of the present application, the airtight gas chamber 1 may be a one-piece structure or a split-type structure, for example, a receiving chamber for receiving the antenna assembly and the linear driving mechanism 5 is provided, and a detachable sealing cover 12 is provided above the receiving chamber, where the specific structure of the airtight gas chamber 1 may be set according to the test requirement, and is not limited herein.
In some implementations of embodiments of the application, the antenna assembly may obtain rf electromagnetic energy in a variety of ways. One of the modes is as follows: the conductive plate 3 is electrically connected with a feed electrode 7, and the feed electrode 7 is used for being electrically connected with a radio frequency source to feed radio frequency electromagnetic energy. Preferably, the feeding electrode 7 comprises an SMA (Sub-Miniature a) coaxial cable, an inner core of the SMA coaxial cable is connected to the metal disc 4, a shielding layer of the SMA coaxial cable is connected to the conductive disc 3, the SMA coaxial cable is connected to an external radio frequency source, and radio frequency electromagnetic energy is fed to the antenna assembly through the radio frequency source. Another way is: setting an electromagnetic field environment, placing the radio frequency electromagnetic energy explosion test device in the electromagnetic field environment, and obtaining radio frequency electromagnetic energy through the coupling action of the antenna component. It is to be understood that the manner in which the antenna assembly obtains rf electromagnetic energy is not limited to the above examples, and other manners in which rf electromagnetic energy may be obtained are also within the scope of the embodiments of the present application, which are not limited herein.
In some implementations of embodiments of the application, when feeding rf electromagnetic energy to the antenna assembly via an external rf source, it is preferable to provide an rf source protection circuit to protect the rf source. The rf source protection circuit adopts an existing conventional protection circuit, and is not described herein.
As shown in fig. 6 and fig. 7, in some implementations of the embodiments of the present application, when the feeder electrode 7 includes a coaxial cable, the antenna body 2 adopts a loop antenna, and the impedance of the coaxial cable is matched with the impedance of the antenna body 2, for example, the impedance of the coaxial cable is equal to the impedance of the antenna body 2, so that when rf electromagnetic energy is fed to the loop antenna through the coaxial cable, energy reflection caused by impedance mismatch can be avoided, and thus rf electromagnetic energy fed by the coaxial cable can be substantially received by the loop antenna, thereby improving energy feeding efficiency. Preferably, the impedance of the coaxial cable and the impedance of the antenna body 2 are set to 50 ohms.
In some implementations of the embodiments of the present application, the loop antenna may be matched with the impedance of the coaxial cable by adjusting a size parameter, where the size parameter is adjusted in a conventional manner and is not described herein. It can be understood that the loop antenna can also control the frequency band corresponding to the resonance point by adjusting the size parameter, for example, the resonance point can be set at any frequency band by adjusting the size parameter, so as to meet the test requirement of each frequency band.
Of course, it is understood that the loop antenna may be a single loop antenna, a concentric dual loop antenna, or other antennas; it should be further understood that the antenna body 2 in the embodiment of the present application is not limited to the loop antenna, but may be any other antenna, which is not limited herein.
In some implementations of the embodiments of the present application, an antenna fixing frame 11 is further disposed below the antenna assembly, so as to improve structural stability of the antenna assembly, and avoid accidents such as rollover of the antenna assembly during testing.
In some implementations of the embodiment of the present application, the conductive plate 3 and the metal plate 4 are disposed opposite to each other when installed, and the distance between the surfaces of the conductive plate and the metal plate is a fixed distance, where the size of the fixed distance is determined by the test requirement, and is not limited herein.
In some implementations of the embodiments of the present application, the conductive disc 3 may be made of any dielectric material with good electrical conductivity, such as a cadmium disc, an aluminum disc, and the like, which is not limited herein.
In some implementations of the embodiment of the application, the conductive disc 3 is a cadmium disc, the metal rod 6 is a tungsten lead screw, and in the test process, it is found that the tungsten filament and the cadmium disc are used as ignition electrodes, so that the ignition efficiency is good.
In some embodiments of the self-adapting example, when one end of the metal rod 6 passes through the conductive disc 3 and enters the electric gap, a limiting member is sleeved on one side of the metal rod 6 in the electric gap, so as to ensure that the metal rod 6 always maintains electrical connection with the metal disc 4 during movement.
In some embodiments, the metal disk 4 is a copper disk.
In some implementations of the embodiment of the present application, the linear driving mechanism 5 includes a driving motor 51, where the driving motor 51 may be a stepper motor, an output end of the driving motor 51 is connected to a motion conversion mechanism 52, the motion conversion mechanism 52 is connected to the metal rod 6, and the motion conversion mechanism 52 is used to convert a rotational driving force output by the driving motor 51 into a linear driving force for driving the metal rod 6 to perform a translational motion.
Specifically, the driving force output by the driving motor 51 is a force for rotating, however, if the gap distance between the metal rod 6 and the conductive plate 3 is to be adjusted, for example, the gap distance between the tungsten wire rod and the cadmium plate is to be adjusted, the tungsten wire rod needs to be controlled to perform translational movement, for example, the tungsten wire rod is controlled to gradually perform translational movement to approach the cadmium plate according to a preset step size, so as to change the gap distance between the tungsten wire rod and the cadmium plate, and therefore, the rotating driving force output by the driving motor 51 needs to be converted into a linear driving force capable of driving the metal rod 6 to perform translational movement.
It should be understood that the metal rod 6 and the metal plate 4 of the embodiment of the present application are both made of conductive materials, and when the metal rod 6 is inserted through the metal plate 4, the two are electrically connected. The motion conversion mechanism 52 is used for converting rotary motion into translational motion, and no electrical effect is involved, so that the motion rotation mechanism 52 is made of non-metallic material, i.e. no electrical connection exists between the motion rotation mechanism 52 and the metal disc 4.
In some implementations of the embodiment of the present application, the motion conversion mechanism 52 is a slider-crank mechanism, where the slider-crank mechanism refers to a planar link mechanism that uses a crank and a slider to implement conversion between rotation and movement, as shown in fig. 5, a member of the slider-crank mechanism that forms a sliding pair with a rack is a slider, and a member that connects the crank and the slider through the sliding pair is a link, and its structure and principle are the prior art and are not described herein.
It should be understood that, when the motion conversion mechanism 52 is a slider-crank mechanism, the slider-crank mechanism should be provided with a motion limit position, wherein the motion limit position of the side where the slider-crank mechanism is connected to the metal rod 6 should ensure stable electrical connection between the metal rod 6 and the metal disc 4, and the motion limit position of the slider-crank mechanism and the side of the driving motor 51 should ensure that the slider-crank mechanism does not interfere with the inner wall of the sealed gas chamber 1, so as to ensure smoothness of motion.
In some implementations of the embodiment of the present application, the motion conversion mechanism 52 may also be a dual-gear structure, or a gear and rack structure, which will not be described herein.
In some implementations of the embodiment of the present application, the gas-tight cavity is provided with a pressure relief opening 8, and a sealing member is blocked on the pressure relief opening 8, preferably, a rubber plug is used as the sealing member to ensure tightness of the gas-tight cavity during the test. After the test is completed, i.e. the explosive gas is exploded, the pressure generated by the explosion is discharged through the pressure relief opening 8, so as to avoid damage to other components in the cavity.
In some implementations of the embodiment of the present application, the gas-enclosed cavity is provided with a gas inlet and a gas outlet, the gas inlet is provided with a gas inlet valve 9, the gas outlet is provided with a gas outlet valve 10, and preferably, the gas inlet valve 9 and the gas outlet valve 10 adopt electromagnetic valves, so that the gas inlet process and the gas outlet process of the gas-enclosed cavity can be automatically controlled.
The safety performance test of radio frequency electromagnetic energy equipment in an explosive environment is an important ring for guaranteeing the safe operation of the equipment. British standard BS 6656:2002 Assessment of inadvertent ignition of flammable atmospheres by radio-frequency radiation-Guide sets forth radio frequency electromagnetic energy power and energy safety thresholds in explosive environments of class I, IIA, IIB and IIC, respectively, e.g. methane gas, requiring an average threshold power of 200us of no more than 6W. The test scheme is to construct a 50 ohm pure resistive circuit to simulate a radio frequency circuit with characteristic impedance of 50 ohms, connect an IEC standard spark table in series to the radio frequency circuit, and evaluate the power safety threshold of radio frequency electromagnetic energy according to the ignition result of the spark test table. GB/T3836.1 part 1 of the explosive Environment: in the general requirement of equipment, the result and the test method are adopted, the frequency band below 30MHz is tested, and the test conclusion is directly promoted to the 99kHz-60GHz frequency band.
For high frequency communication devices, however, such as 5G radio frequencies, the usual frequency band is up to 3.5GHz,
when the 5G radio frequency is spark-discharged relative to the low-frequency electromagnetic wave, the sheath electric field collapses and expands at a high speed, the space transient characteristic is complex, the electronic heating mode is different from classical random heating, electrons are difficult to respond to the electric field along with the increase of the frequency, and the mixed gas discharge of explosive gas and air is more complex than inert gas discharge, so that the problem of error in setting the safe power threshold exists in a mode of directly applying a test conclusion of a frequency band below 30MHz to 5G equipment.
In order to solve the above-mentioned problems, in some embodiments, the linear driving mechanism 5 is further configured to drive the metal rod 6 to be periodically connected to the conductive disc 3 on the basis of the above-mentioned rf electromagnetic energy explosion test device, so that when the explosive gas explodes, the rf electromagnetic energy power at the time of explosion is determined as a power safety threshold during the gradual increase of the rf electromagnetic energy power obtained by the antenna assembly.
Wherein, the periodic connection of the metal rod 6 and the conductive disc 3 means that: the metal rod 6 and the conductive plate 3 are electrically connected according to a preset period. For example, it may be: the driving motor 51 rotates once, and the distance between the metal rod 6 and the conductive disc 3 is from the maximum distance to the minimum distance to the maximum distance, wherein the maximum distance means that the metal rod 6 is located at the initial position, for example, at the metal disc 4, and the minimum distance means that the metal rod is in contact with the conductive disc 3, i.e. the electrical connection is established.
When the power safety threshold of the radio frequency electromagnetic energy is measured, the test principle of the radio frequency electromagnetic energy explosion test device is as follows: the linear driving mechanism 5 is controlled to drive the metal rod 6 to be periodically connected with the conductive disc 3, for example, the driving motor 51 drives the tungsten screw rod to perform periodic translational motion by driving the crank slider mechanism, so that the tungsten screw rod is periodically connected with the conductive disc 3, and in the rotation process of the driving motor 51, the power of the radio frequency electromagnetic energy acquired by the antenna assembly is gradually increased, and when the explosive gas is exploded, the radio frequency electromagnetic energy power during the explosion is determined to be a power safety threshold, so that the power safety threshold test is completed.
In some embodiments, when determining the power safety threshold of the rf electromagnetic energy, the rf electromagnetic energy explosion test device is further connected with a power measurement circuit for measuring the power of the rf electromagnetic energy fed to the antenna assembly, including the power safety threshold.
Based on the disclosure, the linear driving mechanism 5 is further used for driving the metal rod 6 to be periodically connected with the conductive disc 3, so that when the explosive gas explodes in the process of gradually increasing the power of the radio frequency electromagnetic energy acquired by the antenna assembly, the radio frequency electromagnetic energy power during explosion is determined as the power safety threshold, thereby accurately evaluating the power safety thresholds of radio frequency devices with different frequency bands in an explosive place, for example, evaluating the power safety thresholds of 5G devices with different frequency bands in the explosive place, solving the problem that the conventional standard limiting safety threshold is too large to develop the 5G communication technology and providing powerful data support for the application of high-power 5G devices in the explosive place.
Referring to fig. 8, a flow chart of a radio frequency electromagnetic energy explosion test method in an embodiment of the application is shown.
As shown in fig. 8, according to a second aspect of an embodiment of the present application, there is provided a radio frequency electromagnetic energy explosion test method applied to the apparatus according to any one of the first aspects, including, but not limited to, the implementation of steps S101 to S104:
s101, filling explosive gas into a closed gas cavity;
s102, acquiring radio frequency electromagnetic energy through the antenna assembly;
s103, controlling a linear driving mechanism to drive the metal rod to be close to or far away from the conductive disc so as to change the distance between the electric gaps;
step S104, obtaining a gap minimum breakdown voltage corresponding to each gap interval, and establishing a mapping relation between the gap minimum breakdown voltage and the gap interval.
In step S101, the explosive gas includes, but is not limited to, hydrogen, ethylene, methane, and the like. When the explosive gas is filled into the closed gas cavity, the control valve of the gas inlet can be controlled to introduce gas into the cavity, and then the control valve is closed, so that the closed gas cavity is closed, and a testing environment for an explosion test is created.
In step S104, the mapping relationship between the minimum breakdown voltage of the gap and the gap spacing may be a functional relationship, that is, the gap spacing is taken as an independent variable, the minimum breakdown voltage of the gap is taken as an independent variable, and a functional relationship between the two is established.
It should be noted that the gap minimum breakdown voltage may be calculated by the power of electromagnetic energy fed into the antenna assembly. For example: when the impedance of the loop antenna is set to 50 ohms, the calculation formula of the gap minimum breakdown voltage may be as follows:
；
where P is the power of the RF electromagnetic energy fed into the test device, 50 is the antenna impedance, and u is the gap voltage.
In the test process, the distance between the tip of the tungsten screw rod and the cadmium disc is controlled by the driving motor so as to change the electric gap between the cadmium disc and the copper disc, the voltage between the cadmium disc and the tungsten screw rod can be changed by changing the power of radio frequency electromagnetic energy acquired by the antenna assembly, such as changing the power of a radio frequency source, and the minimum breakdown voltage of gaps corresponding to different gap distances under a specific frequency range, namely the radio frequency electromagnetic energy required by different gap distances is known by observing or detecting the electric spark generation or the gas explosion condition, such as detecting the gas explosion condition by adopting a sensor, so that data support is provided for theoretical analysis of plasma discharge under high frequency and explosive gas conditions.
In some embodiments of the present application, based on the foregoing scheme, the method further includes:
s105, controlling the linear driving mechanism to drive the metal rod to be periodically connected with the conductive disc;
step S106, gradually increasing the power of the radio frequency electromagnetic energy acquired by the antenna assembly;
and S107, when the explosive gas explodes, determining the radio frequency electromagnetic energy power at the time of explosion as a power safety threshold.
In steps S105 to S107, the linear driving mechanism is controlled to drive the metal rod to be periodically connected with the conductive disc, for example, the driving motor drives the tungsten screw rod to perform periodic translational motion by driving the crank slider mechanism, so that the tungsten screw rod is periodically connected with the conductive disc, and in the rotation process of the driving motor (for example, 3200 rotation is continuously performed), when the explosive gas is exploded, the power of the radio frequency electromagnetic energy obtained by the antenna assembly is gradually increased, the radio frequency electromagnetic energy power during the explosion is determined as a power safety threshold, and the power safety threshold test under specific input conditions (for example, under specific frequency and modulation waveform) is completed.
Based on the disclosure, the method for testing the explosion of the radio frequency electromagnetic energy provided by the embodiment of the application verifies the synergistic effect between the physical process and the physical parameters during the discharge of the radio frequency energy by obtaining the mapping relation between the minimum discharge breakdown voltage and the gap spacing of the radio frequency electromagnetic energy under the specific frequency, thereby providing data support for theoretical analysis of the plasma discharge under the high frequency and explosive gas conditions; the linear driving mechanism is controlled to drive the metal rod to be periodically connected with the conductive disc, so that the power safety threshold test under the specific input condition is completed, the restriction problem of 5G communication technology development caused by overlarge standard limiting safety threshold can be solved, and powerful data support is provided for the application of high-power 5G equipment in explosive places.
The above description is only an example of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A radio frequency electromagnetic energy explosion test device, comprising:
sealing the gas cavity;
the antenna assembly is arranged in the sealed gas cavity and comprises an antenna body, wherein two ends of the antenna body are respectively and electrically connected with a conductive disc and a metal disc, and the conductive disc and the metal disc are oppositely arranged;
the gap adjusting assembly is arranged in the sealed gas cavity and comprises a linear driving mechanism, the linear driving mechanism is connected with a metal rod, one end of the metal rod penetrates through the metal disc and is electrically connected with the metal disc, and the distance between the end of the metal rod and the conductive disc is an electric gap;
when a radio frequency electromagnetic energy explosion test is carried out, explosive gas is filled in the closed gas cavity, the antenna assembly is used for acquiring radio frequency electromagnetic energy, the linear driving mechanism is used for driving the metal rod to be close to or far away from the conductive disc so as to change the interval of the electric gap, so that the gap minimum breakdown voltage corresponding to each gap interval is acquired, and the mapping relation between the gap minimum breakdown voltage and the gap interval is established.
2. The apparatus of claim 1, wherein the conductive pad is electrically connected to a feed electrode for electrically connecting to a radio frequency source for feeding radio frequency electromagnetic energy.
3. The apparatus of claim 2, wherein the antenna body is a loop antenna and the feed electrode comprises a coaxial cable having an impedance matching an impedance of the antenna body.
4. The device of claim 1, wherein the conductive disc is a cadmium disc and the metal rod is a tungsten lead screw.
5. The device according to claim 1, wherein the linear driving mechanism comprises a driving motor, a motion conversion mechanism is connected to an output end of the driving motor, the motion conversion mechanism is connected to the metal rod, and the motion conversion mechanism is used for converting a rotary driving force output by the driving motor into a linear driving force for driving the metal rod to perform translational motion.
6. The apparatus of claim 5, wherein the motion conversion mechanism is a slider-crank mechanism.
7. The device of claim 1, wherein the sealed gas chamber is provided with a pressure relief port, and wherein the pressure relief port is plugged with a seal.
8. The apparatus of any one of claims 1-7, wherein the linear drive mechanism is further configured to drive the metal rod into periodic connection with the conductive disc to determine a power safety threshold for the rf electromagnetic energy at the time of explosion as the explosive gas is exploded during a step up in power of the rf electromagnetic energy acquired by the antenna assembly.
9. A method of radio frequency electromagnetic energy explosion testing applied to the apparatus of any one of claims 1-8, the method comprising:
filling explosive gas into the closed gas cavity;
acquiring radio frequency electromagnetic energy through an antenna assembly;
controlling the linear driving mechanism to drive the metal rod to be close to or far away from the conductive disc so as to change the distance between the electric gaps;
and acquiring a gap minimum breakdown voltage corresponding to each gap interval, and establishing a mapping relation between the gap minimum breakdown voltage and the gap interval.
10. The method as recited in claim 9, further comprising:
controlling the linear driving mechanism to drive the metal rod to be periodically connected with the conductive disc;
gradually increasing the power of the radio frequency electromagnetic energy acquired by the antenna assembly;
when the explosive gas explodes, the radio frequency electromagnetic energy power at the time of explosion is determined as a power safety threshold.
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| CN115862274A (en) * | 2023-03-03 | 2023-03-28 | 安标国家矿用产品安全标志中心有限公司 | Multi-band radio frequency electromagnetic energy explosion-proof ignition test device and method |
| CN115880866A (en) * | 2023-03-03 | 2023-03-31 | 安标国家矿用产品安全标志中心有限公司 | Electromagnetic energy explosion-proof test linear module and method |
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| CN115862274A (en) * | 2023-03-03 | 2023-03-28 | 安标国家矿用产品安全标志中心有限公司 | Multi-band radio frequency electromagnetic energy explosion-proof ignition test device and method |
| CN115880866A (en) * | 2023-03-03 | 2023-03-31 | 安标国家矿用产品安全标志中心有限公司 | Electromagnetic energy explosion-proof test linear module and method |
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| 空气ESD辐射电磁场和放电间隙区分布研究;贺其元 等;无线电工程;第41卷(第9期);全文 * |
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