A spiral wave plasma measurement method and device based on multi-source information fusion

Abstract

The application relates to a multi-source information fusion spiral wave plasma measurement method and device. The method comprises the following steps: collecting information fusion spiral waves; measuring the spiral waves by a non-contact measurement means to obtain core plasma density and microwave penetration depth of the information fusion; measuring the spiral waves by a contact measurement means to obtain downstream plasma density of the information fusion; capturing the spiral waves by an optical image means to obtain a plasma discharge diagram of the information fusion; and performing numerical fitting on the core plasma density, the microwave penetration depth, the downstream plasma density and the plasma discharge diagram according to an information fusion means to determine a plasma radial density distribution of the information fusion. The application solves the problem that a probe cannot contact and measure high-density spiral wave plasma, and overcomes the measurement limitation of the plasma density in the discharge core area under the limitation of the microwave frequency.

Description

Technical Field

[0001] This invention relates to the field of aerospace electric propulsion technology, and more specifically, to a method and apparatus for measuring helical wave plasma using multi-source information fusion. Background Technology

[0002] As a high-ionization-rate, high-density, and structurally simple ion source, the helical wave ion source is showing increasingly broad application prospects in the materials and aerospace fields. Because the helical wave ion source is an electrode-free source, there is no need to consider the impact of electrode corrosion on the ion source's lifespan. Therefore, the helical wave ion source will have a very important application requirement in future high-power electric propulsion vehicles for space.

[0003] Currently, the understanding of the discharge mechanism and underlying physical mechanisms of helical wave plasma generated by helical wave ion sources is not yet deep and detailed. For example, the energy coupling mechanism of helical wave plasma, the KH instability phenomenon during mode switching, the unclear mechanism of the plasma "blue core" mode discharge, and limitations in plasma density measurement methods remain. Therefore, further in-depth physical mechanism and experimental research is needed to understand the discharge laws and physical characteristics of helical wave plasma, thereby enabling its fuller utilization. Plasma density is a crucial physical parameter for understanding the physical properties of plasma and its discharge laws; accurate measurement of plasma density is fundamental to the study of related physical characteristics of plasma.

[0004] As a high-density plasma, helical wave plasma is susceptible to structural damage and discharge mode shifts when approached by a Langmuir probe due to radio frequency power interference, making direct contact measurement of plasma density impossible. Furthermore, the small spatial scale of helical wave plasma sources used in space electric propulsion means that existing plasma measurement methods for high-density plasma devices such as nuclear fusion cannot be applied to helical wave ion sources used in space electric propulsion. Therefore, to achieve high-density plasma measurement of helical wave ion sources for space electric propulsion, it is necessary to develop more effective small-scale spatial helical wave plasma density diagnostic methods. Summary of the Invention

[0005] This application provides a method and apparatus for measuring helical wave plasma using multi-source information fusion. To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simple form as a prelude to the detailed description that follows.

[0006] In a first aspect, embodiments of this application provide a method for measuring helical wave plasma using multi-source information fusion, the method comprising:

[0007] Spiral wave for information fusion;

[0008] The spiral wave was measured using non-contact measurement methods to obtain the core plasma density and microwave penetration depth of the information fusion.

[0009] The downstream plasma density of the information fusion is obtained by measuring the spiral wave using a contact measurement method.

[0010] The spiral wave is captured by optical imaging techniques to obtain the plasma discharge map of the information fusion.

[0011] The core plasma density, microwave penetration depth, downstream plasma density, and plasma discharge map are numerically fitted using information fusion methods to determine the plasma radial density distribution obtained by information fusion.

[0012] Optionally, the measurement of the spiral wave using non-contact measurement methods to obtain the core plasma density and microwave penetration depth of the information fusion includes:

[0013] The core plasma density of the information fusion was obtained by measuring the spiral wave using a microwave method.

[0014] The microwave penetration depth of the information fusion is obtained by measuring the spiral wave using the time-gating method.

[0015] The microwave method and time-gate method are used as the non-contact measurement means.

[0016] Optionally, the measurement of the spiral wave using a microwave method to obtain the core plasma density for information fusion includes:

[0017] The spiral wave was measured using microwave reflection and a vector network analyzer to obtain the maximum plasma density of the information fusion.

[0018] The spiral wave was measured using microwave transmission and the vector network analyzer to obtain the average plasma density of the information fusion.

[0019] The microwave reflection method and the microwave transmission method are used as the microwave method, and the maximum plasma density and the average plasma density are used as the core plasma density for information fusion.

[0020] Optionally, the step of measuring the spiral wave using a contact measurement method to obtain the downstream plasma density of the information fusion includes:

[0021] The downstream plasma density of the information fusion was obtained by measuring the spiral wave using a probe method and a probe analyzer.

[0022] The probe method is used as the contact measurement method.

[0023] Optionally, the probe method includes: Langmuir probe.

[0024] Optionally, the step of capturing the spiral wave through optical imaging to obtain the plasma discharge map of information fusion includes:

[0025] The spiral wave is captured by a camera to obtain the plasma discharge map of the information fusion;

[0026] The camera is used as the optical image in the segment.

[0027] Optionally, the step of numerically fitting the core plasma density, the microwave penetration depth, the downstream plasma density, and the plasma discharge map using information fusion methods to determine the information-fused plasma radial density distribution includes:

[0028] Based on the core plasma density, the microwave penetration depth, the downstream plasma density, and the plasma discharge map, the radial position point plasma density and radial position point coordinate information of the information fusion are determined.

[0029] The plasma radial density distribution curve of the radial position point is determined by numerical fitting of the plasma density at the radial position point, the coordinate information of the radial position point, and the distribution law of the plasma radial density according to the information fusion method.

[0030] The plasma radial density distribution of the information fusion is represented by the plasma radial density distribution curve.

[0031] Secondly, embodiments of this application provide a multi-source information fusion spiral wave plasma measurement device, the device comprising:

[0032] The information acquisition module is used to acquire spiral waves for information fusion.

[0033] The core density determination module is used to measure the spiral wave through non-contact measurement methods to obtain the core plasma density and microwave penetration depth of the information fusion.

[0034] The downstream density determination module is used to measure the spiral wave through contact measurement to obtain the downstream plasma density of the information fusion.

[0035] An image capture module is used to capture the spiral wave through optical imaging means to obtain the plasma discharge map of the information fusion.

[0036] The radial density determination module is used to perform numerical fitting on the core plasma density, the microwave penetration depth, the downstream plasma density, and the plasma discharge map using information fusion methods to determine the plasma radial density distribution fused by the information.

[0037] Thirdly, embodiments of this application provide a computer storage medium storing multiple instructions adapted for loading and execution of the above-described method steps by a processor.

[0038] Fourthly, embodiments of this application provide a terminal that may include: a processor and a memory; wherein the memory stores a computer program adapted to be loaded by the processor and executed by the above-described method steps.

[0039] The technical solutions provided in this application embodiment may include the following beneficial effects:

[0040] In this embodiment, the multi-source information fusion spiral wave plasma measurement method first acquires the information-fused spiral wave; then, it measures the spiral wave using a non-contact measurement method to obtain the core plasma density and microwave penetration depth of the information fusion; it then measures the spiral wave using a contact measurement method to obtain the downstream plasma density of the information fusion; next, it captures the spiral wave using optical imaging to obtain the plasma discharge map of the information fusion; finally, it performs numerical fitting on the core plasma density, microwave penetration depth, downstream plasma density, and plasma discharge map based on the information fusion method to determine the radial density distribution of the information-fused plasma. This application utilizes non-contact measurement methods, including the microwave method, to measure the core plasma density of the discharge core region. This overcomes the challenges of probes affecting the helical wave discharge mode and damaging the plasma structure at close range, as well as the inability of contact measurement methods to accurately measure density. Simultaneously, it effectively utilizes contact measurement methods, using the probe method to efficiently measure the downstream plasma density downstream of the discharge core region. Furthermore, it captures plasma discharge maps using optical imaging techniques and combines this with microwave penetration depth measured by the time-gating method to obtain coordinate information corresponding to the core plasma density and the downstream plasma density, achieving the measurement of high-density helical wave plasma density through multi-source information fusion. This application solves the problems of probes being unable to contact and measure the plasma density of the current helical wave ion source discharge core region, and the frequency limitations of non-contact measurement equipment preventing the measurement of the highest plasma density in the discharge core region, providing a means and basis for high-density plasma measurement.

[0041] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0042] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0043] Figure 1 This is a flowchart illustrating a multi-source information fusion method for measuring helical wave plasma provided in an embodiment of this application.

[0044] Figure 2 This is a schematic diagram of the overall process of a helical wave plasma measurement method with multi-source information fusion provided in an embodiment of this application;

[0045] Figure 3 This is a schematic diagram of microwave measurement of plasma density using a helical wave plasma measurement method based on multi-source information fusion provided in an embodiment of this application.

[0046] Figure 4 This is a schematic diagram of the probe method for measuring plasma density and the optical method for measuring plasma discharge map of a multi-source information fusion spiral wave plasma measurement method provided in this application embodiment;

[0047] Figure 5 This is a schematic diagram of a helical wave plasma measurement device with multi-source information fusion provided in an embodiment of this application;

[0048] Figure 6 This is a schematic diagram of a terminal provided in an embodiment of this application.

[0049] Figure Labels

[0050] 1 Discharge Chamber

[0051] 2. Helical wave plasma

[0052] 3. Microwave Antenna

[0053] 4 Vector Network Analyzer

[0054] 5. Camera

[0055] 6 Langmuir probes

[0056] 7 Langmuir Probe Analyzer Detailed Implementation

[0057] The following description and accompanying drawings fully illustrate specific embodiments of the invention to enable those skilled in the art to practice them.

[0058] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0059] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of systems and methods consistent with some aspects of the invention as detailed in the appended claims.

[0060] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0061] The following will be combined with the appendix Figure 1 -Appendix Figure 4 This paper provides a detailed description of a multi-source information fusion method for measuring helical wave plasma provided in the embodiments of this application.

[0062] Please see Figure 1-4 This is a flowchart illustrating a multi-source information fusion method for measuring helical wave plasma, as provided in this application embodiment. Figure 1-4 As shown, the method in this application embodiment may include the following steps:

[0063] This application proposes a multi-source information fusion method for measuring helical wave plasma density, specifically a method for measuring high-density plasma density using space-electrically propelled helical waves, based on multi-source information fusion. For example... Figure 2 and Figure 3As shown, the method may include: a high-density spiral wave plasma source, a microwave antenna 3, a vector network analyzer 4, a camera 5, a Langmuir probe 6, and a Langmuir probe analyzer 7, etc. The main function of the spiral wave plasma source is to ionize the working gas into spiral wave plasma 2. The high-density spiral wave plasma source consists of a vacuum discharge chamber 1, a spiral wave antenna, an electromagnetic coil, a vacuum pump, and an intake device; the electromagnetic coil is used to generate an axial magnetic field to confine and control the spiral wave plasma, the vacuum pump is used to evacuate the discharge chamber, and the intake device is used to provide the working gas. The discharge chamber 1 is made of a non-metallic quartz glass tube with a circular cross-section. The spiral wave plasma 2 is generated by applying radio frequency power through the spiral wave antenna, resulting in the ionization of the gas inside the discharge chamber under the coupling effect of the electromagnetic field and the applied magnetic field. The plasma described in this application is spiral wave plasma.

[0064] The microwave antenna is connected to the vector network analyzer via a signal transmission line for non-contact measurement of the core plasma density in the discharge core region. The Langmuir probe is placed downstream of the discharge chamber and connected to the Langmuir probe analyzer via a transmission line for contact measurement of the downstream plasma density in the discharge core region. The camera is fixed above the discharge chamber on a tripod, taking a top-down view of the entire chamber to capture images of the helical wave plasma discharge.

[0065] The high-density plasma measurement method proposed in this application, based on multi-source information fusion using probes, microwaves, and optical methods, enables wide-range, multi-method measurement of high-density plasma. Addressing limited testing conditions, it measures the average plasma density using microwave transmission, the maximum plasma density using microwave reflection, the downstream plasma density using a Langmuir probe, and captures spiral wave plasma discharge maps using a camera. Combined with numerical fitting, it further inverts the highest plasma density in the core region of the discharge, thus obtaining the radial cross-sectional density profile distribution curve of the plasma. This achieves density measurement of spiral wave high-density plasma, solving the problems of being unable to measure the highest plasma density in the discharge core region due to frequency limitations in non-contact measurement, and the inability of probes to contact and measure high-density spiral wave plasma in the discharge core region. This application also addresses the problems of small spatial scale of high-density spiral wave plasma sources for space electric propulsion and the inability of existing methods to measure high-density plasma density in small-sized ion sources. It proposes a plasma density measurement method using multi-source information fusion, overcoming the limitations of measuring plasma density in the discharge core region under microwave frequency constraints and solving the problem of probes being unable to contact and measure high-density spiral wave plasma for space electric propulsion. This provides a means and basis for measuring high-density plasma for space electric propulsion. Specifically:

[0066] S100, a spiral wave for collecting and fusing information.

[0067] S200, the spiral wave is measured using a non-contact measurement method to obtain the core plasma density and microwave penetration depth of the information fusion, including:

[0068] The core plasma density of the information fusion is obtained by measuring the spiral wave using a microwave method; the microwave method is only applicable to the measurement of plasma density in non-metallic discharge chambers; specifically:

[0069] The spiral wave was measured using microwave reflection and a vector network analyzer to obtain the maximum plasma density of the information fusion.

[0070] In this embodiment of the application, for the microwave reflection method, the frequency f of the microwave antenna is... p Satisfying 30GHz≤f p For plasmas ≤110 GHz, the microwave reflection method is used to measure the maximum plasma density. A microwave antenna is placed on one side of the plasma discharge chamber wall, with the antenna's signal transmission port perpendicular to the chamber wall and the antenna axis at the same horizontal level as the chamber axis. This method uses a single microwave antenna connected to a vector network analyzer, enabling the measurement of plasma frequency and phase changes.

[0071] When measuring the maximum plasma density, the maximum plasma density can be obtained by recording the frequency and phase changes of the microwave signal displayed on the vector network analyzer.

[0072] The spiral wave was measured using microwave transmission and the vector network analyzer to obtain the average plasma density of the information fusion.

[0073] In this embodiment of the application, for the microwave transmission method, the frequency of the microwave antenna cannot be lower than 9 GHz. The microwave transmission method is used to measure the average density of plasma. The method uses two microwave antennas connected to a vector network analyzer. One microwave antenna is used to transmit microwave signals, and the other microwave antenna is used to receive microwave signals transmitted through the plasma. The two microwave antennas are symmetrically placed on both sides of the discharge chamber. To ensure good transmission and reception of microwave signals, the microwave antenna (port) is perpendicular to the wall of the discharge chamber, the microwave antenna ports correspond to each other, and the antenna axis is at the same height as the discharge chamber axis.

[0074] When measuring the average plasma density, the average plasma density under the corresponding operating conditions is obtained by recording the frequency and phase changes of the microwave signal displayed on the vector network analyzer.

[0075] Using a vector network analyzer with time-domain options, along with a spread spectrum analyzer and a horn antenna, the microwave penetration depth in the helical wave plasma is measured using the time-gating method. Specifically, the vector network analyzer, connected to the horn antenna, transmits a pulse signal of a certain frequency to the helical wave plasma. After a certain gate delay time, the time gate is opened to record the returned pulse signal information. The transmission distance s1 of the microwave signal at that frequency can be calculated from the time difference between the transmitted and returned pulse signals. The distance s2 between the horn antenna and the discharge chamber is measured. The microwave penetration depth obtained by information fusion is then calculated from s1 - s2. Here, the vector network analyzer can be... Figure 2 The vector network analyzer 4 in the middle, the horn antenna can be Figure 2 Microwave antenna 3 is used in this embodiment. In this application, the microwave reflection method and the microwave transmission method are used as the microwave method, and the microwave method and the time-gate method are used as the non-contact measurement means. The maximum plasma density and the average plasma density are used as the core plasma density for information fusion.

[0076] S300, the spiral wave is measured using a contact measurement method to obtain the downstream plasma density of the information fusion, including:

[0077] The downstream plasma density of the information fusion is obtained by measuring the spiral wave using a probe method and a probe analyzer; the probe method is used as the contact measurement means. The probe method includes a Langmuir probe, and correspondingly, the probe analyzer includes a Langmuir probe analyzer.

[0078] In this embodiment of the application, for discharge chambers with a large aperture, a probe array can be used to measure the radial density of the plasma.

[0079] Plasma density is measured using a Langmuir probe with RF power compensation. The Langmuir probe is connected to the discharge chamber via a vacuum flange and placed at a predetermined downstream distance from the core region of the plasma discharge, with its axis aligned with the discharge chamber axis. The Langmuir probe is connected to a Langmuir probe analyzer. Placing the Langmuir probe at a predetermined downstream distance from the core region of the plasma discharge for plasma density measurement avoids any interference with the plasma structure; this predetermined downstream distance is greater than 30 cm.

[0080] When measuring plasma density using a Langmuir probe, the corresponding electrical parameters can be obtained from the IV characteristic curve recorded by the Langmuir probe analyzer, thereby calculating the downstream plasma density under the corresponding operating conditions. The IV characteristic curve is a current-voltage characteristic curve.

[0081] In summary, for helical wave plasma, close-range contact probe measurement has a significant impact on the plasma structure, causing a change in the helical wave plasma discharge mode and making it impossible to accurately measure the plasma density in the discharge core region. Therefore, this application embodiment utilizes the advantage of non-contact measurement methods, including the microwave method, which does not affect the plasma structure and discharge mode in the discharge core region. The microwave method is used to achieve non-contact measurement of the plasma density in the discharge core region using a microwave antenna and a vector network analyzer, while a probe is used to perform contact measurement of the plasma density downstream of the plasma discharge core region.

[0082] S400, capturing the spiral wave through optical imaging to obtain the plasma discharge map of the information fusion, including:

[0083] The spiral wave is captured by a camera to obtain the plasma discharge map of the information fusion; the plasma discharge map is also called an optical discharge map, and the camera is used as the optical imaging means.

[0084] In this embodiment, a camera is used to capture images of high-density spiral wave plasma discharge. The camera is positioned above the plasma discharge chamber, and its shooting range includes the entire area inside the discharge chamber. The camera can capture images of the entire discharge process of the high-density spiral wave plasma within the discharge chamber. These images are referred to as the plasma discharge diagram described in this embodiment.

[0085] S500, based on information fusion methods, numerically fits the core plasma density, the microwave penetration depth, the downstream plasma density, and the plasma discharge map to determine the information-fused plasma radial density distribution, including:

[0086] Based on the core plasma density, the microwave penetration depth, the downstream plasma density, and the plasma discharge map, the radial position point plasma density and radial position point coordinate information of the information fusion are determined; the radial position point plasma density, the radial position point coordinate information, and the plasma radial density distribution law are numerically fitted according to the information fusion method to determine the plasma radial density distribution curve of the information fusion; the plasma radial density distribution curve is used to represent the plasma radial density distribution of the information fusion.

[0087] In this embodiment, the maximum plasma density obtained through microwave reflection, time-gating, microwave transmission, and probe methods, along with the corresponding microwave penetration depth, average plasma density, and downstream plasma density, are matched with different plasma density coordinate information acquired through plasma discharge maps. A numerical fitting method is then used to obtain the radial density distribution curve of the plasma across the entire radial domain, thereby determining the plasma density information at different radial positions within the discharge chamber. Specifically:

[0088] The coordinates of the maximum plasma density in the plasma discharge diagram can be obtained by using the maximum plasma density and microwave penetration depth, and the shape of its envelope and corresponding coordinate information can be determined. The plasma density on a certain envelope in the corresponding plasma discharge diagram can be obtained by using the downstream plasma density. The plasma density at a certain coordinate position in the plasma discharge diagram between the maximum plasma density and the downstream plasma density can be obtained by using the average plasma density.

[0089] The plasma density and coordinates at radial positions in the discharge chamber can be determined using the above method. First, the coordinates and corresponding plasma density values ​​at the radial positions are used as basic difference points. Then, least squares fitting or polynomial interpolation is used to obtain the plasma radial density distribution curve. The more difference points there are, the closer the obtained interpolation function will be to the actual plasma radial density distribution. Finally, by substituting the corresponding coordinates, the maximum plasma density in the discharge core region can be obtained.

[0090] In this embodiment, the multi-source information fusion spiral wave plasma measurement method first acquires the information-fused spiral wave; then, it measures the spiral wave using a non-contact measurement method to obtain the core plasma density and microwave penetration depth of the information fusion; it then measures the spiral wave using a contact measurement method to obtain the downstream plasma density of the information fusion; next, it captures the spiral wave using optical imaging to obtain the plasma discharge map of the information fusion; finally, it performs numerical fitting on the core plasma density, microwave penetration depth, downstream plasma density, and plasma discharge map based on the information fusion method to determine the radial density distribution of the information-fused plasma. This application utilizes non-contact measurement methods, including the microwave method, to measure the core plasma density in the discharge core region. This overcomes the challenges of probes affecting the helical wave discharge mode and damaging the plasma structure at close range, as well as the inaccuracy of density measurement in contact methods. Simultaneously, it effectively utilizes contact measurement methods, using the probe method to efficiently measure the downstream plasma density downstream of the discharge core region. Furthermore, it captures plasma discharge maps using optical imaging techniques and combines this with microwave penetration depth measurements obtained via the time-gating method to obtain the coordinate information corresponding to the core plasma density and the downstream plasma density, achieving multi-source information fusion for the measurement of high-density helical wave plasma density. This application solves the problem of probes being unable to make contact in measuring high-density helical wave plasma, overcomes the limitations of measuring plasma density in the discharge core region under microwave frequency constraints, and provides a means for high-density plasma measurement.

[0091] The following are embodiments of the apparatus of the present invention, which can be used to execute embodiments of the method of the present invention. For details not disclosed in the embodiments of the apparatus of the present invention, please refer to the embodiments of the method of the present invention.

[0092] Please see Figure 5 The diagram illustrates a schematic representation of a multi-source information fusion spiral wave plasma measurement device according to an exemplary embodiment of the present invention. The device includes: an information acquisition module 10, a core density determination module 20, a downstream density determination module 30, an image capture module 40, and a radial density determination module 50.

[0093] Information acquisition module 10 is used to acquire spiral waves from information fusion;

[0094] The core density determination module 20 is used to measure the spiral wave through non-contact measurement methods to obtain the core plasma density and microwave penetration depth of the information fusion.

[0095] The downstream density determination module 30 is used to measure the spiral wave through a contact measurement method to obtain the downstream plasma density of the information fusion.

[0096] Image capture module 40 is used to capture the spiral wave through optical imaging means to obtain the plasma discharge map of information fusion;

[0097] The radial density determination module 50 is used to determine the radial density distribution of the plasma fused by numerical fitting of the core plasma density, the microwave penetration depth, the downstream plasma density and the plasma discharge map using information fusion methods.

[0098] It should be noted that the multi-source information fusion spiral wave plasma measurement device provided in the above embodiments is only illustrated by the division of the above functional modules when executing the multi-source information fusion spiral wave plasma measurement method. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the multi-source information fusion spiral wave plasma measurement device and the multi-source information fusion spiral wave plasma measurement method embodiments provided in the above embodiments belong to the same concept, and the implementation process is detailed in the method embodiments, which will not be repeated here.

[0099] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0100] The multi-source information fusion spiral wave plasma measurement device first acquires the information-fused spiral wave; then, it measures the spiral wave using a non-contact measurement method to obtain the core plasma density and microwave penetration depth of the information fusion; next, it measures the spiral wave using a contact measurement method to obtain the downstream plasma density of the information fusion; then, it captures the spiral wave using optical imaging to obtain the plasma discharge map of the information fusion; finally, it performs numerical fitting on the core plasma density, microwave penetration depth, downstream plasma density, and plasma discharge map based on the information fusion method to determine the radial density distribution of the information-fused plasma. This application utilizes a non-contact measurement method, including the microwave method, to measure the core plasma density of the discharge core region, overcoming the difficulties of probes affecting the spiral wave discharge mode and damaging the plasma structure at close range, and the inability of contact measurement methods to accurately measure its density; simultaneously, it effectively utilizes contact measurement methods, using the probe method to effectively measure the downstream plasma density downstream of the discharge core region; and simultaneously, it captures the plasma discharge map based on optical imaging; combined with the microwave penetration depth measured by the time-gating method, it obtains the coordinate information corresponding to the core plasma density and the downstream plasma density, thus realizing the measurement of the high-density plasma density of the multi-source information fusion spiral wave. This application solves the problem that the probe cannot reach and measure high-density spiral wave plasma, overcomes the limitation of measuring plasma density in the discharge core region under microwave frequency constraints, and provides a means for high-density plasma measurement.

[0101] The present invention also provides a computer-readable medium having program instructions stored thereon, which, when executed by a processor, implement the multi-source information fusion spiral wave plasma measurement method provided in the above-described method embodiments.

[0102] The present invention also provides a computer program product containing instructions that, when run on a computer, causes the computer to execute the multi-source information fusion spiral wave plasma measurement method of the above-described method embodiments.

[0103] Please see Figure 6 This is a schematic diagram of the structure of a terminal provided in an embodiment of this application. Figure 6 As shown, terminal 1000 may include: at least one processor 1001, at least one network interface 1004, user interface 1003, memory 1005, and at least one communication bus 1002.

[0104] The communication bus 1002 is used to realize the connection and communication between these components.

[0105] The user interface 1003 may include a display screen and a camera. Optionally, the user interface 1003 may also include a standard wired interface and a wireless interface.

[0106] The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface).

[0107] The processor 1001 may include one or more processing cores. The processor 1001 connects to various parts within the terminal 1000 using various interfaces and lines, and performs various functions and processes data by running or executing instructions, programs, code sets, or instruction sets stored in the memory 1005, and by calling data stored in the memory 1005. Optionally, the processor 1001 may be implemented using at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 1001 may integrate one or a combination of several of the following: Central Processing Unit (CPU), Graphics Processing Unit (GPU), and modem. The CPU primarily handles the operating system, user interface, and applications; the GPU is responsible for rendering and drawing the content required for display; and the modem handles wireless communication. It is understood that the modem may also be implemented as a separate chip without being integrated into the processor 1001.

[0108] The memory 1005 may include random access memory (RAM) or read-only memory. Optionally, the memory 1005 may include a non-transitory computer-readable storage medium. The memory 1005 can be used to store instructions, programs, code, code sets, or instruction sets. The memory 1005 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as touch function, sound playback function, image playback function, etc.), instructions for implementing the above-described method embodiments, etc.; the data storage area may store data involved in the above-described method embodiments, etc. Optionally, the memory 1005 may also be at least one storage device located remotely from the aforementioned processor 1001. Figure 6 As shown, the memory 1005, which serves as a computer storage medium, may include an operating system, a network communication module, a user interface module, and a multi-source information fusion spiral wave plasma measurement application.

[0109] exist Figure 6 In the terminal 1000 shown, the user interface 1003 is mainly used to provide an input interface for the user and to acquire the user's input data; while the processor 1001 can be used to call the multi-source information fusion spiral wave plasma measurement application stored in the memory 1005, and specifically perform the following operations:

[0110] Spiral wave for information fusion;

[0111] The spiral wave was measured by non-contact measurement to obtain the core plasma density and microwave penetration depth of the information fusion.

[0112] The downstream plasma density of the information fusion is obtained by measuring the spiral wave using a contact measurement method.

[0113] The spiral wave is captured by optical imaging techniques to obtain the plasma discharge map of the information fusion.

[0114] The core plasma density, microwave penetration depth, downstream plasma density, and plasma discharge map are numerically fitted using information fusion methods to determine the plasma radial density distribution fused by the information fusion.

[0115] In one embodiment, when the processor 1001 performs the measurement of the spiral wave using a non-contact measurement method to obtain the core plasma density and microwave penetration depth of the information fusion, it specifically performs the following operations:

[0116] The core plasma density of the information fusion was obtained by measuring the spiral wave using a microwave method.

[0117] The microwave penetration depth of the information fusion is obtained by measuring the spiral wave using the time-gating method.

[0118] The microwave method and time-gate method are used as the non-contact measurement means.

[0119] In one embodiment, when the processor 1001 performs the measurement of the spiral wave using a microwave method to obtain the core plasma density of the information fusion, it specifically performs the following operations:

[0120] The spiral wave was measured using microwave reflection and a vector network analyzer to obtain the maximum plasma density of the information fusion.

[0121] The spiral wave was measured using microwave transmission and the vector network analyzer to obtain the average plasma density of the information fusion.

[0122] The microwave reflection method and the microwave transmission method are used as the microwave method, and the maximum plasma density and the average plasma density are used as the core plasma density for information fusion.

[0123] In one embodiment, when the processor 1001 performs the measurement of the spiral wave via contact measurement to obtain the downstream plasma density of the information fusion, it specifically performs the following operations:

[0124] The downstream plasma density of the information fusion is obtained by measuring the spiral wave using a probe method and a probe analyzer; the probe method includes a Langmuir probe.

[0125] The probe method is used as the contact measurement method.

[0126] In one embodiment, when processor 1001 performs the operation of capturing the spiral wave through optical imaging to obtain the plasma discharge map of information fusion, it specifically performs the following operations:

[0127] The spiral wave is captured by a camera to obtain the plasma discharge map of the information fusion;

[0128] The camera is used as the optical imaging means.

[0129] In one embodiment, when the processor 1001 performs numerical fitting of the core plasma density, the microwave penetration depth, the downstream plasma density, and the plasma discharge map according to the information fusion method to determine the fused plasma radial density distribution, it specifically performs the following operations:

[0130] Based on the core plasma density, the microwave penetration depth, the downstream plasma density, and the plasma discharge map, the radial position point plasma density and radial position point coordinate information of the information fusion are determined.

[0131] The plasma radial density distribution curve of the radial position point is determined by numerical fitting of the plasma density at the radial position point, the coordinate information of the radial position point, and the distribution law of the plasma radial density according to the information fusion method.

[0132] The plasma radial density distribution of the information fusion is represented by the plasma radial density distribution curve.

[0133] The proposed multi-source information fusion helical wave plasma measurement method first acquires the information-fused helical wave; then, it measures the helical wave using a non-contact measurement method to obtain the core plasma density and microwave penetration depth of the information fusion; next, it measures the helical wave using a contact measurement method to obtain the downstream plasma density of the information fusion; then, it captures the helical wave using optical imaging to obtain the plasma discharge map of the information fusion; finally, it performs numerical fitting on the core plasma density, microwave penetration depth, downstream plasma density, and plasma discharge map based on the information fusion method to determine the radial density distribution of the information-fused plasma. This application utilizes a non-contact measurement method, including the microwave method, to measure the core plasma density of the discharge core region, overcoming the difficulties of probes affecting the helical wave discharge mode and damaging the plasma structure at close range, and the inability of contact measurement methods to accurately measure its density; simultaneously, it effectively utilizes contact measurement methods, using the probe method to effectively measure the downstream plasma density downstream of the discharge core region; and simultaneously, it captures the plasma discharge map based on optical imaging; combined with the microwave penetration depth measured by the time-gating method, it obtains the coordinate information corresponding to the core plasma density and the downstream plasma density, thus realizing the measurement of high-density helical wave plasma density through multi-source information fusion. This application solves the problem that the probe cannot reach and measure high-density spiral wave plasma, overcomes the limitation of measuring plasma density in the discharge core region under microwave frequency constraints, and provides a means for high-density plasma measurement.

[0134] Those skilled in the art will understand that implementing all or part of the processes in the above embodiments can be accomplished by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory, or random access memory, etc.

[0135] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A method for measuring helical wave plasma using multi-source information fusion, characterized in that, Includes the following steps: Spiral wave for information fusion; The spiral wave is measured using non-contact measurement methods to obtain the core plasma density and microwave penetration depth of the information fusion, including: The core plasma density of the information fusion was obtained by measuring the spiral wave using a microwave method, including: The spiral wave was measured using microwave reflection and a vector network analyzer to obtain the maximum plasma density of the information fusion. The spiral wave was measured using microwave transmission and the vector network analyzer to obtain the average plasma density of the information fusion. The microwave reflection method and the microwave transmission method are used as the microwave method, and the maximum plasma density and the average plasma density are used as the core plasma densities for information fusion. The microwave penetration depth of the information fusion is obtained by measuring the spiral wave using the time-gating method. The microwave method and time-gating method are used as the non-contact measurement means; The downstream plasma density of the information fusion is obtained by measuring the spiral wave using a contact measurement method. The spiral wave is captured by optical imaging techniques to obtain the plasma discharge map of the information fusion. The core plasma density, microwave penetration depth, downstream plasma density, and plasma discharge map are numerically fitted using information fusion methods to determine the plasma radial density distribution fused by the information fusion.

2. The spiral wave plasma measurement method according to claim 1, characterized in that, The step of measuring the spiral wave using a contact measurement method to obtain the downstream plasma density of the information fusion includes: The downstream plasma density of the information fusion was obtained by measuring the spiral wave using a probe method and a probe analyzer. The probe method is used as the contact measurement method.

3. The spiral wave plasma measurement method according to claim 2, characterized in that, The probe method includes: Langmuir probe.

4. The spiral wave plasma measurement method according to claim 1, characterized in that, The step of capturing the spiral wave using optical imaging techniques to obtain the plasma discharge map obtained through information fusion includes: The spiral wave is captured by a camera to obtain the plasma discharge map of the information fusion; The camera is used as the optical imaging means.

5. The spiral wave plasma measurement method according to claim 1, characterized in that, The step of determining the fused plasma radial density distribution by numerically fitting the core plasma density, microwave penetration depth, downstream plasma density, and plasma discharge map using information fusion methods includes: Based on the core plasma density, the microwave penetration depth, the downstream plasma density, and the plasma discharge map, the radial position point plasma density and radial position point coordinate information of the information fusion are determined; The plasma radial density distribution curve of the radial position point is determined by numerical fitting of the plasma density at the radial position point, the coordinate information of the radial position point, and the distribution law of the plasma radial density according to the information fusion method. The plasma radial density distribution of the information fusion is represented by the plasma radial density distribution curve.

6. A helical wave plasma measurement device with multi-source information fusion, characterized in that, include: The information acquisition module is used to acquire spiral waves for information fusion. The core density determination module is used to measure the spiral wave using non-contact measurement methods to obtain the core plasma density and microwave penetration depth of the information fusion, including: The core plasma density of the information fusion was obtained by measuring the spiral wave using a microwave method, including: The spiral wave was measured using microwave reflection and a vector network analyzer to obtain the maximum plasma density of the information fusion. The spiral wave was measured using microwave transmission and the vector network analyzer to obtain the average plasma density of the information fusion. The microwave reflection method and the microwave transmission method are used as the microwave method, and the maximum plasma density and the average plasma density are used as the core plasma densities for information fusion. The microwave penetration depth of the information fusion is obtained by measuring the spiral wave using the time-gating method. The microwave method and time-gating method are used as the non-contact measurement means; The downstream density determination module is used to measure the spiral wave through contact measurement to obtain the downstream plasma density of the information fusion. An image capture module is used to capture the spiral wave through optical imaging means to obtain the plasma discharge map of the information fusion. The radial density determination module is used to perform numerical fitting on the core plasma density, the microwave penetration depth, the downstream plasma density, and the plasma discharge map using information fusion methods to determine the plasma radial density distribution fused by the information.

7. A computer storage medium, characterized in that, The computer storage medium stores a plurality of instructions adapted for loading by a processor and executing the method steps as claimed in any one of claims 1-5.

8. A terminal, characterized in that, include: A processor and a memory; wherein the memory stores a computer program adapted to be loaded by the processor and to execute the method steps as claimed in any one of claims 1-5.

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