Radio frequency electromagnetic energy explosion testing device and method

Abstract

The invention discloses a radio frequency electromagnetic energy explosion testing device and method. The device comprises a closed gas cavity, a testing cable, a linear driving mechanism and a processing circuit. The airtight gas cavity is filled with explosive gas. The test cable comprises an inner conductor and an outer conductor, the outer conductor is coaxially arranged around the inner conductor, the inner conductor comprises a first inner conductor and a second inner conductor which are oppositely arranged in the axial direction, the end, away from the second inner conductor, of the first inner conductor is configured to receive radio frequency electromagnetic energy, and the power of the radio frequency electromagnetic energy tends to be increased. And the linear driving mechanism is connected with one end, far away from the first inner conductor, of the second inner conductor, and is configured to drive the second inner conductor to periodically reciprocate along the axial direction, so that the second inner conductor and the first inner conductor are periodically disconnected or connected. And the processing circuit is configured to take the power of the radio frequency electromagnetic energy corresponding to gas explosion as a power safety threshold. According to the invention, data support can be provided for safe operation of the coaxial cable in practical application.

Description

Technical Field

[0001] This application belongs to the field of communication testing technologies, and particularly relates to a radio frequency electromagnetic energy explosion testing device and method. Background Art

[0002] The safety performance testing of radio frequency electromagnetic energy equipment in an explosive environment is an important part of ensuring the safe operation of the equipment. For example: The safety performance testing of radio frequency transmission lines (such as coaxial cables) in an underground explosive gas environment is an important part of ensuring underground radio frequency transmission.

[0003] When a radio frequency transmission line fails, it is very likely to generate a spark in an explosive gas environment, thus triggering an underground explosion accident. Therefore, it is necessary to test the safety performance of radio frequency transmission lines in an explosive environment. Summary of the Invention

[0004] Embodiments of this application provide a radio frequency electromagnetic energy explosion testing device and method, which can detect the power safety threshold of radio frequency electromagnetic energy when there is an unstable contact fault in the inner conductor of a test cable in an explosive gas environment, thereby providing data support for the safe operation of coaxial cables in practical applications.

[0005] Other features and advantages of this application will become apparent through the following detailed description, or will be partially learned through the practice of this application.

[0006] According to a first aspect of the embodiments of this application, a radio frequency electromagnetic energy explosion testing device is provided, including: A sealed gas chamber filled with explosive gas inside; A test cable disposed in the sealed gas chamber, including an inner conductor and an outer conductor that are insulated from each other, the outer conductor is coaxially disposed around the inner conductor, the inner conductor includes a first inner conductor and a second inner conductor that are axially opposite to each other, one end of the first inner conductor away from the second inner conductor is configured to receive radio frequency electromagnetic energy, and the power of the radio frequency electromagnetic energy shows an increasing trend; A linear drive mechanism disposed in the sealed gas chamber, connected to one end of the second inner conductor away from the first inner conductor, and configured to drive the second inner conductor to reciprocate periodically along the axis, so that the second inner conductor is periodically disconnected or conducted with the first inner conductor; A processing circuit configured to use the power of the radio frequency electromagnetic energy corresponding to the explosion as the power safety threshold when detecting that the explosive gas explodes.

[0007] Optionally, the outer conductor includes a first outer conductor and a second outer conductor that are axially opposite to each other, and there is a gap between the first outer conductor and the second outer conductor; The device further includes: an induction coil, which includes a coil body and a coil probe connected to each other. The coil body is sleeved on the first inner conductor or the second inner conductor at the gap, and the coil probe extends outside the sealed gas chamber. The processing circuit is further configured to detect the operating current when the first inner conductor and the second inner conductor are conducting based on the coil probe.

[0008] Optionally, the first inner conductor and the second outer conductor have the same diameter, and the ratio of the diameter of the outer conductor to the diameter of the first inner conductor is: 2.3:1.

[0009] Optionally, the sealed gas chamber further includes: a first base, and a groove is provided on one side of the first base facing the test cable. The test cable further includes: a first support member, which is sleeved on the outer conductor, and the bottom of the first support member is embedded in the groove.

[0010] Optionally, the sealed gas chamber further includes: a second base, and the top of the second base faces the test cable. The test cable further includes: a second support member, which is sleeved on the outer conductor, and the second support member is arranged on the top of the second base.

[0011] Optionally, the second support member is closer to the linear drive mechanism than the first support member. The linear drive mechanism is provided with an output shaft, and the output shaft is connected to one end of the second inner conductor away from the first inner conductor. A first elastic member is provided between the first support member and the side wall of the gas sealed chamber, and the first elastic member is sleeved on the outer conductor. The second support member is sleeved on the output shaft and abuts against one end of the outer conductor close to the linear drive mechanism.

[0012] Optionally, the operating frequency band range of the test cable is: 400 MHz to 5 GHz. The processing circuit is further configured to: obtain the power safety threshold corresponding to different frequencies.

[0013] A second aspect of the embodiments of the present application provides a radio frequency electromagnetic energy explosion test method, which is applied to the device according to any one of the first aspect. The method includes: In the case where the power of the radio frequency electromagnetic energy received by the first inner conductor shows an increasing trend, control the linear drive mechanism to drive the second inner conductor to reciprocate periodically along the axis, so that the second inner conductor is periodically disconnected or conducted with the first inner conductor. When it is detected that the explosive gas explodes, the power of the radio frequency electromagnetic energy corresponding to the explosion is used as the power safety threshold.

[0014] Optionally, the outer conductor includes a first outer conductor and a second outer conductor that are oppositely arranged along the axis, and there is a gap between the first outer conductor and the second outer conductor; the device further includes: an induction coil, the induction coil includes a coil body and a coil probe that are connected to each other, the coil body is sleeved on the first inner conductor or the second inner conductor at the gap, and the coil probe extends outside the sealed gas chamber. The method further includes: Detecting the working current when the first inner conductor and the second inner conductor are conducted based on the coil probe; Determining the spark discharge power according to the working current, the power safety threshold, and the preset impedance of the test cable.

[0015] Optionally, the method further includes: Obtaining the spark discharge power and the power safety threshold at different frequencies; Establishing a mapping relationship between the spark discharge power and the power safety threshold.

[0016] According to the radio frequency electromagnetic energy explosion test device provided by one or more embodiments of the present application, it includes: a sealed gas chamber, a test cable, a linear drive mechanism, and a processing circuit. The sealed gas chamber is filled with explosive gas. The test cable is arranged in the sealed gas chamber and includes an inner conductor and an outer conductor that are insulated from each other. The outer conductor is coaxially arranged around the inner conductor. The inner conductor includes a first inner conductor and a second inner conductor that are oppositely arranged along the axis. One end of the first inner conductor away from the second inner conductor is configured to receive radio frequency electromagnetic energy, and the power of the radio frequency electromagnetic energy shows an increasing trend; the linear drive mechanism is arranged in the sealed gas chamber and is connected to one end of the second inner conductor away from the first inner conductor, and is configured to drive the second inner conductor to reciprocate periodically along the axis so that the second inner conductor is periodically disconnected or conducted with the first inner conductor. The processing circuit is configured to use the power of the radio frequency electromagnetic energy corresponding to the explosion as the power safety threshold when it is detected that the explosive gas explodes. Thus, the embodiments of the present application can, in an explosive gas environment, simulate a fault of unstable contact of the inner conductor of the test cable by periodically disconnecting or conducting the first inner conductor and the second inner conductor, and detect the power safety threshold of the radio frequency electromagnetic energy, thereby providing data support for the safe operation of the coaxial cable in actual applications and avoiding explosion ignition accidents caused by unstable contact of the inner conductor during actual use; in addition, the embodiments of the present application perform energy transmission through the direct contact of the first inner conductor and the second inner conductor, reducing the energy transmission loss during the test process, improving the anti-external interference ability and the adaptability in different test environments.

[0017] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application. Obviously, the drawings in the following description are only some embodiments of this application, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts. In the drawings: Figure 1 shows a structural diagram of a radio frequency electromagnetic energy explosion test device according to an embodiment of this application; Figure 2 shows an explosion diagram of a radio frequency electromagnetic energy explosion test device according to an embodiment of this application; Figure 3 shows another structural diagram of a radio frequency electromagnetic energy explosion test device according to an embodiment of this application; Figure 4 shows a flowchart of a radio frequency electromagnetic energy explosion test method according to an embodiment of this application.

[0019] Among them, 1 - sealed gas chamber; 11 - first base; 12 - groove; 13 - second base; 14 - first elastic member; 15 - second elastic member; 2 - test cable; 21 - inner conductor; 21A - first inner conductor; 21A1 - cable joint; 21B - second inner conductor; 21C - first support member; 21D - second support member; 22 - outer conductor; 3 - linear drive mechanism; 31 - drive motor; 32 - motion conversion mechanism; 33 - first output shaft; 34 - second output shaft; X - axial direction; 4 - induction coil; 41 - coil body; 42 - coil probe; 5 - radio frequency source; 6 - circulator; 71 - first power meter; 72 - second power meter; 8 - bidirectional directional coupler; 9 - attenuator; 10 - load. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the drawings in the embodiments of this application. Obviously, the described embodiments are only some of the embodiments of this application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.

[0021] In addition, the described features, structures, or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present application. However, those skilled in the art will realize that the technical solutions of the present application may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be employed. In other cases, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the present application.

[0022] The flowchart shown in the drawings is only an exemplary illustration, and does not necessarily include all contents and operations / steps, nor does it necessarily need to be executed in the described order. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to the actual situation.

[0023] Coaxial cables have the advantages of high bandwidth, good anti-electromagnetic interference energy, and easy laying and expansion. They are usually used for the transmission of 5G signals of radio frequency sources and are widely used in various industrial scenarios including explosive places (such as coal mines, petrochemical industries, and dusty environments). For example, gas is one of the most dangerous harmful gases in coal mine production. When its concentration exceeds a certain limit, it will trigger an explosion accident. Therefore, it is necessary to strictly monitor and control the gas concentration. When gas absorbs heat energy, it may explode, and the higher the heat energy, the easier it is to explode. When the heat near the radio frequency coaxial cable underground is large enough, it will cause sparking and arc release. When the released energy is sufficient and the gas meets the explosion conditions, an explosion may occur.

[0024] In actual work, the environment in coal mine shafts is complex. When radio frequency coaxial cables are in use, they may be damaged due to environmental reasons or aging problems, resulting in unstable contact of the cables. In an environment with high-concentration harmful gases, it is extremely easy to generate sparks, thus causing underground explosion accidents. Therefore, it is necessary to test the safety performance of coaxial cables in explosive environments to ensure safe operation in explosive environments.

[0025] In view of this, the embodiments of the present application provide a radio frequency electromagnetic energy explosion test device, which can provide data support for the safe operation of coaxial cables in actual applications and avoid explosion ignition accidents caused by unstable contact of the inner conductor during actual use.

[0026] The radio frequency electromagnetic energy explosion test device of the embodiments of the present application will be described below with reference to specific drawings.

[0027] Figure 1 The structure diagram of the radio frequency electromagnetic energy explosion test device of the embodiments of the present application is shown; Figure 2 The explosion diagram of the radio frequency electromagnetic energy explosion test device of the embodiments of the present application is shown.

[0028] According to the first aspect of the embodiments of the present application, a radio frequency electromagnetic energy explosion test device is provided, including: a sealed gas chamber 1, a test cable 2, a linear drive mechanism 3, and a processing circuit. The sealed gas chamber 1 is filled with explosive gas inside. The test cable 2 is disposed in the sealed gas chamber 1 and includes an inner conductor 21 and an outer conductor 22 that are insulated from each other. The outer conductor 22 is coaxially disposed around the inner conductor 21. The inner conductor 21 includes a first inner conductor 21A and a second inner conductor 21B that are oppositely disposed along the axial direction X. One end of the first inner conductor 21A away from the second inner conductor 21B is configured to receive radio frequency electromagnetic energy, and the power of the radio frequency electromagnetic energy shows an increasing trend. The linear drive mechanism 3 is disposed in the sealed gas chamber 1 and is connected to one end of the second inner conductor 21B away from the first inner conductor 21A, and is configured to drive the second inner conductor 21B to reciprocate periodically along the axial direction X, so that the second inner conductor 21B is periodically disconnected or conducted with the first inner conductor 21A. The processing circuit is configured to use the power of the radio frequency electromagnetic energy corresponding to the explosion as the power safety threshold when detecting that the explosive gas explodes.

[0029] It should be noted that, in order to simulate the underground environment, the sealed gas chamber 1 is provided in the embodiments of the present application. The sealed gas chamber 1 is filled with explosive gas, and the explosive gas refers to a gas that may explode after receiving a certain amount of energy (such as thermal energy), for example, methane (CH4), hydrogen (H2), carbon monoxide (CO), hydrogen sulfide (H2S), etc.

[0030] It can be understood that a radio frequency coaxial cable generally includes: an inner conductor 21, an insulating layer, and an outer conductor 22 from the inside out. The outer conductor 22 and the inner conductor 21 are coaxially disposed. Among them, the inner conductor 21 is used to transmit electrical signals and is the main path of the current, and can be made of solid copper wire, stranded copper wire, or copper-coated aluminum wire, etc.; the insulating layer is used to isolate the inner conductor 21 and the outer conductor 22 and provide mechanical support, and can be made of solid plastic, foam plastic, or gas medium, etc.; the outer conductor 22 serves as a return path and provides a shielding effect against external electromagnetic interference to protect the internal signal from external noise, and can be made of fine copper wire braiding or a foil layer.

[0031] In order to conduct safety tests on the use of coaxial cables in downhole environments, the embodiment of this application is provided with a test cable 2. The test cable 2 includes an inner conductor 21 and an outer conductor 22 that are insulated from each other. The outer conductor 22 is coaxially arranged around the inner conductor 21, that is, the inner conductor 21 and the outer conductor 22 are centered around the same center line, and the length direction of the center line is the length direction of the inner conductor 21 and / or the outer conductor 22. The axes X of the inner conductor 21 and the outer conductor 22 are the same, that is, the length direction of the center line. Among them, the inner conductor 21 and the outer conductor 22 are metal conductors. For example, the inner conductor 21 is a metal rod, and the outer conductor 22 is a metal hollow cylinder.

[0032] In some embodiments, an insulating layer (not shown) is provided between the inner conductor 21 and the outer conductor 22 of the embodiment of this application, so that the inner conductor 21 and the outer conductor 22 are insulated from each other and prevent excessive energy loss during the operation of the device.

[0033] It can be understood that a cable joint 21A1 can be provided at one end of the first inner conductor 21A away from the second inner conductor 21B. The cable joint 21A1 can be connected to an external coaxial cable, and the coaxial cable can be connected to a radio frequency source 5. The radio frequency source 5 can be a 5G base station or a combination of a power amplifier and a signal generator. Thus, the radio frequency electromagnetic energy emitted by the radio frequency source 5 can be transmitted to the first inner conductor 21A through the coaxial cable. Among them, when conducting a radio frequency electromagnetic energy explosion test device, the power of the radio frequency electromagnetic energy received by the first inner conductor 21A shows an increasing trend. It can be understood that the greater the power, the greater the current flowing through the first inner conductor 21A and the second inner conductor 21B, and the more heat generated by the first inner conductor 21A and the second inner conductor 21B.

[0034] The periodic disconnection or conduction of the first inner conductor 21A and the second inner conductor 21B can be: the first inner conductor 21A and the second inner conductor 21B are in contact and conduction at intervals of a certain time and are disconnected at intervals of a certain time, that is, "conduction - disconnection - conduction - disconnection". For example: Suppose the first inner conductor 21A and the second inner conductor 21B are in contact and conduction for 5 seconds at intervals and are disconnected for 4 seconds at intervals. Then, within a duration of 18 seconds, the first inner conductor 21A and the second inner conductor 21B are in a state of contact and conduction within the first 4 seconds, in a disconnected state within the 4 - 9 seconds, in a state of contact and conduction within the 9 - 13 seconds, and in a disconnected state within the 13 - 18 seconds, and so on.

[0035] It can be understood that the processing circuit of the embodiment of this application can be an integrated circuit including a control circuit, a detection circuit, a data analysis circuit, etc. For example, the power of the radio frequency electromagnetic energy can be controlled through the control circuit, the movement of the linear drive mechanism 3 can be controlled, etc., the power safety threshold can be detected through the detection circuit (such as a power sensor, etc.), and data calculation can be performed through the data analysis circuit.

[0036] It should be noted that the principle of the radio frequency electromagnetic energy explosion test device in the embodiments of the present application is as follows: When performing the radio frequency electromagnetic energy explosion test, the first inner conductor 21A receives radio frequency electromagnetic energy, and the power of the radio frequency electromagnetic energy shows an increasing trend. The linear drive mechanism 3 drives the second inner conductor 21B to reciprocate periodically along the axial direction X, as Figure 1 or Figure 2 shown. The axial direction X is consistent with the length directions of the first inner conductor 21A and the second inner conductor 21B, so that the second inner conductor 21B is periodically disconnected or conducted with the first inner conductor 21A to simulate the problem of unstable contact (i.e., intermittent open circuit) of the inner conductor 21 of the coaxial cable. When the processing circuit detects that the explosive gas explodes, it indicates that the power of the radio frequency electromagnetic energy reaches the threshold for igniting the explosive gas, and the power of the radio frequency electromagnetic energy corresponding to the explosion is used as the power safety threshold; conversely, if the radio frequency electromagnetic energy does not reach the corresponding threshold, the explosive gas will not be ignited even if an electric spark is generated. Thus, it is possible to test and obtain the power safety threshold below which the coaxial cable should operate when it is in an explosive environment, thereby avoiding the occurrence of explosion accidents caused by the problem of unstable contact (intermittent open circuit) of the inner conductor 21 of the coaxial cable.

[0037] In some embodiments of the present application, the sealed gas chamber 1 can be an integral structure or a split structure. For example, a receiving chamber for accommodating the test cable 2 and the linear drive mechanism 3 is provided, and a detachable sealing cover is provided above the receiving chamber. The specific structure of the sealed gas chamber 1 can be set according to the test requirements and will not be limited here.

[0038] In some embodiments, the diameters of the first inner conductor 21A and the second outer conductor 22 are the same, and the ratio of the diameter of the outer conductor 22 to the diameter of the first inner conductor 21A is: 2.3:1.

[0039] It should be noted that the characteristic impedance is a key parameter of the coaxial cable and can determine the matching degree between the cable and the signal source or the load 10. The characteristic impedance can be calculated by the following formula: ; wherein, represents the characteristic impedance, represents the relative permittivity of the insulating medium between the inner conductor 21 and the outer conductor 22, represents the diameter of the outer conductor 22, represents the diameter of the first inner conductor 21A.

[0040] As can be seen from the above formula, a larger diameter ratio will result in a higher characteristic impedance. In typical applications, the characteristic impedance of coaxial cables is usually set to 50 ohms. In the embodiments of the present application, when the diameter ratio of the outer conductor 22 is 1:2.3, a characteristic impedance close to 50Ω can be achieved, while helping the electric field to be evenly distributed between the inner conductor 21 and the outer conductor 22, reducing the risks of partial discharge and breakdown.

[0041] In some embodiments, the operating frequency band range of the test cable 2 is: 400 MHz to 5 GHz, for example, 400 MHz, 600 MHz, 1 GHz, 1.5 GHz, 2 GHz, 3 GHz, 3.5 GHz, 4 GHz, 5 GHz, etc. The processing circuit is further configured to: obtain the power safety threshold corresponding to different frequencies.

[0042] It can be understood that the operating frequency band range of the coaxial cable can be determined by performance parameters such as characteristic impedance, the diameter ratio of the inner and outer conductors 22, and the signal attenuation on the inner and outer conductors 22. Through testing, it is found in the embodiments of the present application that the operating frequency band range of the test cable 2 can be 400 MHz to 5 GHz. Thus, the power safety threshold at different frequencies can be obtained, and the mapping relationship between frequency and power safety threshold can also be established, thereby providing more accurate data support for the safe operation of the coaxial cable during actual use.

[0043] It should be noted that the operating frequency band range of the coaxial cable is related to the design of S parameters. The S parameters include S11 and S12. Among them, S11 represents return loss and can be used to evaluate the impedance matching between the coaxial cable and its connectors. Good matching means that signals can be transmitted efficiently without excessive reflection, which is crucial for maintaining signal integrity. As the frequency increases, the S11 of the coaxial cable may deteriorate because factors such as skin effect and dielectric loss will lead to a higher reflectivity. Among them, S12 represents insertion loss, which reflects the transmission efficiency of the coaxial cable. Ideally, all input energy should reach the output end, but in reality, there will be a certain amount of energy loss, and this part of the loss is the insertion loss. The insertion loss increases with the increase in frequency because the skin effect reduces the effective cross-sectional area of the conductor, increasing the resistance; at the same time, the dielectric loss of the insulating material also intensifies with the increase in frequency.

[0044] In some embodiments, the outer conductor 22 includes a first outer conductor 22 and a second outer conductor 22 that are oppositely disposed along the axial direction X, and there is a gap between the first outer conductor 22 and the second outer conductor 22. The device further includes: an induction coil 4, the induction coil 4 includes a coil body 41 and a coil probe 42 that are connected to each other, the coil body 41 is sleeved on the first inner conductor 21A or the second inner conductor 21B at the gap, and the coil probe 42 extends out of the sealed gas chamber 1; the processing circuit is further configured to detect the working current when the first inner conductor 21A and the second inner conductor 21B are conducting based on the coil probe 42.

[0045] Combined with Figure 1 or Figure 2 It can be seen that the induction coil 4 is sleeved on the first inner conductor 21A or the second inner conductor 21B. When the first inner conductor 21A and the second inner conductor 21B are in contact and conducting, based on the principle of electromagnetic induction, the current Ispark of the electric spark can be measured through the coil (the working current when the first inner conductor 21A and the second inner conductor 21B are conducting).

[0046] Figure 3 Another structural diagram of the radio frequency electromagnetic energy explosion test device according to the embodiment of the present application is shown.

[0047] In some embodiments, the device further includes: a radio frequency source 5, a circulator 6, a first power meter 71, a second power meter 72, and a bidirectional directional coupler 8. The radio frequency source 5 is connected to the circulator 6, the circulator 6 is connected to the input end of the bidirectional directional coupler 8. After the output end of the bidirectional directional coupler 8 is connected to the inner conductor 21, energy is output to the load 10. The forward coupling end of the bidirectional directional coupler 8 is connected to the first power meter 7, and the reverse coupling end of the bidirectional directional coupler 8 is connected to the second power meter 72. In addition, the bidirectional directional coupler 8 is also connected to a load 10. Thus, after the radio frequency signal emitted by the radio frequency source 5 enters from one of the ports of the circulator 6, it is cyclically output to the bidirectional directional coupler 8 in a predetermined direction, and then transmitted from the bidirectional directional coupler 8 to the first inner conductor 21A. Among them, the first power meter 71 is used to detect the intensity of the forward transmission of the radio frequency signal, and the second power meter 72 is used to detect the intensity of the reverse transmission after the radio frequency signal is reflected. Then, the power difference detected by the first power meter 71 and the second power meter 72 is the power of the radio frequency electromagnetic energy actually fed into the first inner conductor 21A.

[0048] Based on the above, according to the power detected by the first power meter 71 and the second power meter 72, and the characteristic impedance of the coaxial cable itself, the voltage Uspark of the electric spark can be calculated based on the following formula: Uspark = [(forward power - reverse power) × 50] 1 / 2 ; (1) Then, by combining the current Ispark and voltage Uspark of the electric spark, the electric spark power can be calculated, and the calculation formula is as follows: The electric spark power Pspark = Uspark × Ispark; (2) According to formulas (1) and (2), the electric spark power corresponding to the power of the radio frequency electromagnetic energy can be obtained, and the electric spark power corresponding to the power safety threshold can also be obtained. Thus, by acquiring the power safety threshold and the electric spark power at different frequencies, a mapping relationship between the power safety threshold and the electric spark power can be established based on interpolation.

[0049] It can be understood that after establishing the mapping relationship between the power safety threshold and the electric spark power, the corresponding power safety threshold can be directly deduced based on the working current of the inner conductor 21 on the coaxial cable, thereby improving the test efficiency of different power safety thresholds corresponding to the unstable contact fault of the inner conductor 21 of the coaxial cable. In addition, during the actual application of the coaxial cable, the corresponding power safety threshold can be determined by detecting the working current on the inner conductor 21, and the radio frequency electromagnetic energy can be controlled below the power safety threshold, thereby ensuring the safe operation of the coaxial cable.

[0050] In some embodiments, the device further includes: an attenuator 9, one end of the attenuator 9 is connected to a circulator 6, and the other end is connected to a load 10. Thus, the signal intensity entering the load 10 from the circulator 6 is reduced, the signal level is controlled, the load 10 is protected from excessive signal loss, and the stability of the test device is ensured.

[0051] In some embodiments, the driving linear mechanism includes: a driving motor 31 and a motion conversion mechanism 32. The driving motor 31 is provided with a first output shaft 33; the motion conversion mechanism 32 is connected to the first output shaft 33, the motion conversion mechanism 32 is provided with a second output shaft 34, and the second output shaft 34 is connected to one end of the second inner conductor 21B away from the first inner conductor 21A.

[0052] Exemplarily, the driving force output by the driving motor 31 is a force for rotational motion. However, based on the above settings, if the first inner conductor 21A and the second inner conductor 21B are to be periodically conducted or disconnected, the second inner conductor 21B needs to be controlled to perform a linear reciprocating motion. Therefore, it is necessary to convert the rotational driving force output by the driving motor 31 into a linear driving force that can drive the two inner conductors 21 to perform translational motion.

[0053] In some embodiments, the motion conversion mechanism 32 is a crank-slider mechanism, which is a planar linkage mechanism that uses a crank and a slider to achieve the mutual conversion between rotation and translation. The specific structure can refer to the related art and will not be elaborated here. Alternatively, the motion conversion mechanism 32 can also be a double-gear structure, or a structure of a gear and a rack, which will not be elaborated here.

[0054] In some embodiments, the sealed gas chamber 1 further includes: a first base 11, on one side of the first base 11 facing the test cable 2, a groove 12 is provided; the test cable 2 further includes: a first support member 21C, the first support member 21C is sleeved on the outer conductor 22, and the bottom of the first support member 21C is embedded in the groove 12.

[0055] It can be understood that by using the first support member 21C to support one side of the outer conductor 22 and embedding the bottom of the first support member 21C in the groove 12, the outer conductor 22 can be fixed inside the sealed gas chamber 1, improving the structural stability. Among them, the first support member 21C can be a metal disk, and through holes are provided on the metal disk, so that the metal disk can be sleeved on the outer conductor 22. Among them, in order to ensure the structural stability, the diameter of the through hole can be the same as the diameter of the outer conductor 22. It can also be understood that when the first support member 21C adopts a metal support member, the first support member 21C can also serve as the outer conductor 22.

[0056] In some embodiments, the sealed gas chamber 1 further includes: a second base 13, the top of the second base 13 faces the test cable 2; the test cable 2 further includes: a second support member 21D, the second support member 21D is sleeved on the outer conductor 22, and the second support member 21D is arranged on the top of the second base 13.

[0057] It can be understood that by using the second support member 21D to support the other side of the outer conductor 22 and arranging the second support member 21D on the second base 13, for example, fixed on the second base 13 by using metal screws, the outer conductor 22 can be fixed inside the sealed gas chamber 1, improving the structural stability. Among them, the second support member 21D can be a "cross" metal member, and the inside of the cross metal member is a hollow structure, so that the cross metal member can be sleeved on the outer conductor 22. Among them, in order to ensure the structural stability, the diameter of the hollow structure of the actual metal member can be the same as the diameter of the outer conductor 22. It can also be understood that when the second support member 21D adopts a metal support member, the second support member 21D can also serve as the outer conductor 22.

[0058] In some embodiments, the second support member 21D is closer to the linear drive mechanism 3 than the first support member 21C. The linear drive mechanism 3 is provided with an output shaft, and the output shaft is connected to an end of the second inner conductor 21B away from the first inner conductor 21A; a first elastic member 14 is provided between the first support member 21C and the side wall of the gas tight chamber, and the first elastic member 14 is sleeved on the outer conductor 22; the second support member 21D is sleeved on the output shaft and abuts against an end of the outer conductor 22 close to the linear drive mechanism 3.

[0059] It can be understood that the first elastic member 14 and the second elastic member 15 can be springs. The first elastic member 14 can play a role in supporting and damping vibration. While the second elastic member 15 plays a role in supporting and damping vibration, it can also play a role in assisting the reset of the second inner conductor 21B through elastic force.

[0060] In some embodiments, an air inlet and an air outlet are formed on the gas tight chamber. An intake valve is provided on the air inlet, and an exhaust valve is provided on the air outlet. Exemplarily, the intake valve and the exhaust valve adopt solenoid valves, so that the intake process and the exhaust process of the gas tight chamber can be automatically controlled.

[0061] Based on the above - disclosed content, the radio - frequency electromagnetic energy explosion test device of the embodiments of the present application includes: a sealed gas chamber 1, a test cable 2, a linear drive mechanism 3, and a processing circuit. The sealed gas chamber 1 is filled with explosive gas. The test cable 2 is arranged in the sealed gas chamber 1 and includes an inner conductor 21 and an outer conductor 22 that are insulated from each other. The outer conductor 22 is coaxially arranged around the inner conductor 21. The inner conductor 21 includes a first inner conductor 21A and a second inner conductor 21B that are oppositely arranged along the axial direction X. One end of the first inner conductor 21A away from the second inner conductor 21B is configured to receive radio - frequency electromagnetic energy, and the power of the radio - frequency electromagnetic energy shows an increasing trend. The linear drive mechanism 3 is arranged in the sealed gas chamber 1 and is connected to one end of the second inner conductor 21B away from the first inner conductor 21A, and is configured to drive the second inner conductor 21B to reciprocate periodically along the axial direction X so that the second inner conductor 21B is periodically disconnected or conducted with the first inner conductor 21A. The processing circuit is configured to, when detecting that the explosive gas explodes, use the power of the radio - frequency electromagnetic energy corresponding to the explosion as the power safety threshold. Thus, the embodiments of the present application can, in an explosive gas environment, simulate a fault of unstable contact of the inner conductor 21 of the test cable 2 by periodically disconnecting or conducting the first inner conductor 21A and the second inner conductor 21B, and detect the power safety threshold of the radio - frequency electromagnetic energy, thereby providing data support for the safe operation of the coaxial cable in practical applications and avoiding explosion ignition accidents caused by unstable contact of the inner conductor 21 during actual use. In addition, the embodiments of the present application perform energy transmission through the direct contact of the first inner conductor 21A and the second inner conductor 21B, reducing the energy loss during transmission, improving the anti - external interference ability, and the adaptability in different test environments.

[0062] Figure 4 The flowchart of the radio - frequency electromagnetic energy explosion test method of the embodiments of the present application is shown.

[0063] In the second aspect of the embodiments of the present application, a radio - frequency electromagnetic energy explosion test method is provided, which is applied to the device as described in any one of the first aspects. The processing circuit may include a controller, and the method may be executed on the controller. The method includes but is not limited to: Step S10. In the case where the power of the radio - frequency electromagnetic energy received by the first inner conductor shows an increasing trend, control the linear drive mechanism to drive the second inner conductor to reciprocate periodically along the axial direction so that the second inner conductor is periodically disconnected or conducted with the first inner conductor; It can be understood that for the increase in the power of the radio - frequency electromagnetic energy, the power output of the radio - frequency source can be controlled by the controller, or the radio - frequency source can preset a power output rule and perform power output according to the rule, such as increasing the power by 1 kilowatt every 5 seconds, etc. This is only an example here and does not limit the embodiments of the present application.

[0064] Step S20. When it is detected that the explosive gas explodes, use the power of the radio frequency electromagnetic energy corresponding to the explosion as the power safety threshold.

[0065] It can be understood that the implementation principles of the methods in steps S10 - S20 of the embodiments of the present application can be referred to the foregoing, and will not be elaborated here.

[0066] In some embodiments, the outer conductor includes a first outer conductor and a second outer conductor that are axially oppositely arranged, and there is a gap between the first outer conductor and the second outer conductor; the device further includes: an induction coil, the induction coil includes a coil body and a coil probe that are connected to each other, the coil body is sleeved on the first inner conductor or the second inner conductor at the gap, and the coil probe extends outside the sealed gas chamber, and the method further includes: Step S30. Detect the working current when the first inner conductor and the second inner conductor are conducting based on the coil probe; Step S40. Determine the spark discharge power according to the working current, the power safety threshold, and the preset impedance of the test cable.

[0067] It can be understood that the implementation principles of the methods in steps S30 - S40 of the embodiments of the present application can be referred to the foregoing, and will not be elaborated here.

[0068] In some embodiments, the method further includes: Step S50. Obtain the spark discharge power and the power safety threshold at different frequencies; Step S60. Establish a mapping relationship between the spark discharge power and the power safety threshold.

[0069] It can be understood that the implementation principles of the methods in steps S50 - S60 of the embodiments of the present application can be referred to the foregoing, and will not be elaborated here.

[0070] The above are only the embodiments of the present application, and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A radio frequency electromagnetic energy explosion test device, characterized in that, Comprising: A sealed gas chamber filled with explosive gas inside; A test cable disposed in the sealed gas chamber, including an inner conductor and an outer conductor that are insulated from each other. The outer conductor is coaxially disposed around the inner conductor. The inner conductor includes a first inner conductor and a second inner conductor that are axially opposite to each other. One end of the first inner conductor away from the second inner conductor is configured to receive radio frequency electromagnetic energy, and the power of the radio frequency electromagnetic energy shows an increasing trend; A linear drive mechanism disposed in the sealed gas chamber, connected to one end of the second inner conductor away from the first inner conductor, and configured to drive the second inner conductor to reciprocate periodically along the axis, so that the second inner conductor is periodically disconnected or conducted with the first inner conductor; A processing circuit configured to, when detecting an explosion of the explosive gas, use the power of the radio frequency electromagnetic energy corresponding to the explosion as a power safety threshold.

2. The device according to claim 1, wherein, The outer conductor includes a first outer conductor and a second outer conductor that are axially opposite to each other, and there is a gap between the first outer conductor and the second outer conductor; The device further includes: an induction coil, which includes a coil body and a coil probe connected to each other. The coil body is sleeved on the first inner conductor or the second inner conductor at the gap, and the coil probe extends outside the sealed gas chamber; The processing circuit is further configured to detect the working current when the first inner conductor and the second inner conductor are conducted based on the coil probe.

3. The device according to claim 1, characterized in that, The first inner conductor and the second outer conductor have the same diameter, and the ratio of the diameter of the outer conductor to the diameter of the first inner conductor is: 2.3:

1.

4. The device according to claim 1, characterized in that, The sealed gas chamber further includes: a first base, and a groove is provided on one side of the first base facing the test cable; The test cable further includes: a first support member sleeved on the outer conductor, and the bottom of the first support member is embedded in the groove.

5. The device according to claim 4, characterized in that, The sealed gas chamber further includes: a second base, and the top of the second base faces the test cable; The test cable further includes: a second support member sleeved on the outer conductor, and the second support member is disposed on the top of the second base.

6. The device according to claim 5, characterized in that, The second support member is closer to the linear drive mechanism than the first support member. The linear drive mechanism is provided with an output shaft, and the output shaft is connected to one end of the second inner conductor away from the first inner conductor; A first elastic member is provided between the first support member and the side wall of the gas sealed chamber, and the first elastic member is sleeved on the outer conductor; The second support member is sleeved on the output shaft and abuts against one end of the outer conductor close to the linear drive mechanism.

7. The device according to any one of claims 1-6, characterized in that, The working frequency band range of the test cable is: 400 MHz to 5 GHz; The processing circuit is further configured to: obtain the power safety thresholds corresponding to different frequencies.

8. A method for testing the explosion of radio frequency electromagnetic energy, characterized in that, Applied to the device according to any one of claims 1-7, the method includes: When the power of the radio frequency electromagnetic energy received by the first inner conductor shows an increasing trend, control the linear drive mechanism to drive the second inner conductor to reciprocate periodically along the axial direction, so that the second inner conductor is periodically disconnected or connected to the first inner conductor; When it is detected that the explosive gas explodes, use the power of the radio frequency electromagnetic energy corresponding to the explosion as the power safety threshold.

9. The method according to claim 8, wherein The outer conductor includes a first outer conductor and a second outer conductor that are oppositely arranged along the axial direction, and there is a gap between the first outer conductor and the second outer conductor; the device further includes: an induction coil, the induction coil includes a coil body and a coil probe that are connected to each other, the coil body is sleeved on the first inner conductor or the second inner conductor at the gap, and the coil probe extends out of the sealed gas chamber. The method further includes: Detect the working current when the first inner conductor and the second inner conductor are conducting based on the coil probe; Determine the spark discharge power according to the working current, the power safety threshold, and the preset impedance of the test cable.

10. The method according to claim 9, wherein The method further includes: Obtain the spark discharge power and the power safety threshold at different frequencies; Establish a mapping relationship between the spark discharge power and the power safety threshold.

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