A high-frequency rotating magnetic field transient magnetic field configuration measurement system and method

Abstract

The application relates to the technical field of aerospace space electromagnetic propulsion, in particular to a high-frequency rotating magnetic field transient magnetic field configuration measuring system and method, the system comprises a high-frequency rotating magnetic field, a three-axis inductive magnetic probe, a signal transmission bus and an oscilloscope, wherein: a plurality of three-axis inductive magnetic probe arrays are uniformly distributed in the high-frequency rotating magnetic field to be measured; one end of the signal transmission bus is fixed at the boundary of the high-frequency rotating magnetic field region to be measured, and the other end is connected with the oscilloscope; the signal transmission line of each three-axis inductive magnetic probe is connected with the signal transmission bus; the oscilloscope is internally provided with a data processing system, which is used for collecting inductive magnetic field signals and processing the same, and displays the configuration and dynamic change of the high-frequency rotating magnetic field to be measured in real time. The application is suitable for transient rotating magnetic field configuration detection with a frequency of 0-1 MHz, and the known inductive magnetic probe, the oscilloscope and other instruments are combined skillfully to have the ability of high-frequency magnetic field measurement.

Description

Technical Field

[0001] This application relates to the field of aerospace electromagnetic propulsion technology, and more specifically, to a transient magnetic field configuration measurement system and method for a high-frequency rotating magnetic field. Background Technology

[0002] High-frequency rotating magnetic fields are used to form and drive the field-reversed plasma cluster (FRC) in a novel FRC electromagnetic thruster. Due to magnetohydrodynamic instabilities, FRCs are difficult to form and accelerate stably, so this novel electromagnetic acceleration technology has strict requirements on the configuration of the rotating magnetic field.

[0003] The frequency of the rotating magnetic field in traditional motors is less than 100 Hz, which is easy to detect. However, the high-frequency rotating magnetic field of 10 to 1000 kHz cannot be accurately measured using existing instruments and methods. Therefore, it is impossible to measure and optimize the transient configuration of the high-frequency rotating magnetic field. Summary of the Invention

[0004] This application provides a transient magnetic field configuration measurement system and method for high-frequency rotating magnetic fields, which can measure the transient magnetic field configuration of high-frequency rotating magnetic fields and obtain the dynamic changes of the magnetic field configuration.

[0005] To achieve the above objectives, this application provides a transient magnetic field configuration measurement system for a high-frequency rotating magnetic field, including a high-frequency rotating magnetic field to be measured, a triaxial induction magnetic probe, a signal transmission bus, and an oscilloscope. Multiple triaxial induction magnetic probe arrays are evenly distributed within the high-frequency rotating magnetic field to be measured for inducing magnetic field signals. One end of the signal transmission bus is fixed at the boundary of the region of the high-frequency rotating magnetic field to be measured, and the other end is connected to the oscilloscope for transmitting the induced magnetic field signals. The signal transmission line of each triaxial induction magnetic probe is connected to the signal transmission bus. The oscilloscope has an internal data processing system for collecting and processing the induced magnetic field signals, and for displaying the configuration and dynamic changes of the high-frequency rotating magnetic field to be measured in real time.

[0006] Furthermore, the high-frequency rotating magnetic field to be measured is a time-varying dynamic magnetic field obtained by synthesizing two-phase or multi-phase resonant magnetic fields according to the phase difference. Its measurable frequency range is 0-1.0MHz, and its magnetic field strength is 0-1T.

[0007] Furthermore, the triaxial inductive magnetic probe consists of three inductive magnetic probes fixed along three axes of a spatial rectangular coordinate system. The three inductive magnetic probes are fixed perpendicularly to each other, and each magnetic probe can measure the magnetic field strength of the current area.

[0008] Furthermore, the oscilloscope's response time is on the order of femtoseconds.

[0009] Further, the application also provides a method for measuring the transient magnetic field configuration of high-frequency rotating magnetic field by using the system, comprising the following steps: step 1: knowing the high-frequency rotating magnetic field to be measured, selecting the size of the inductive magnetic probe according to the measurement accuracy requirement, assembling three inductive magnetic probes into a three-axis inductive magnetic probe, and preparing multiple identical three-axis inductive magnetic probes for standby; step 2: according to the requirement of the spatial resolution of the measurement, multiple three-axis inductive magnetic probes are fixedly arranged in the high-frequency rotating magnetic field region with a certain array density; step 3: the signal transmission lines of each three-axis inductive magnetic probe in the array are concentrated, orderly and fixedly connected with the signal transmission bus at the boundary of the high-frequency rotating magnetic field region, and the signal transmission bus is connected with the oscilloscope; step 4: the oscilloscope starts to work, collects the inductive magnetic field signals, and obtains the data change of the magnetic field size in a period of time; and step 5: the obtained magnetic field data is processed to obtain the transient configuration of the high-frequency rotating magnetic field at a certain moment, and then the magnetic field transient configurations of continuous moments are arranged in time sequence to obtain the dynamic change of the magnetic field configuration.

[0010] Further, in step 2, the array density of the three-axis inductive magnetic probe determines the geometric accuracy of the final measurement.

[0011] Further, in step 4, the magnetic field size is obtained by time integration processing of the inductive magnetic field signal change rate of the three-axis inductive magnetic probe.

[0012] Further, in step 5, the transient configuration of the high-frequency rotating magnetic field is obtained by interpolation processing according to the magnetic field size measured by each three-axis inductive magnetic probe.

[0013] The high-frequency rotating magnetic field transient magnetic field configuration measurement system and method provided by the application have the following beneficial effects:

[0014] The application is suitable for transient rotating magnetic field configuration detection with a frequency of 0-1MHz, especially for the rotating magnetic field configuration measurement of the current FRC electromagnetic thruster. By using the known inductive magnetic probe, oscilloscope and other instruments, the application has the ability to solve the high-frequency magnetic field measurement through ingenious combination. The magnetic probe does not use additional power supply, but transmits signals by the inductive current of the changing magnetic field, and has no interference to the magnetic field. In addition, as long as the probe size is appropriate and the array density is appropriate, the requirement of the measurement accuracy can be met. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The drawings illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In the drawings:

[0016] Figure 1is a schematic diagram of a transient magnetic field configuration measurement system of a high-frequency rotating magnetic field (including an enlarged view of a three-axis induction magnetic probe) provided by an embodiment of the present application;

[0017] In the figure: 1 - high-frequency rotating magnetic field to be measured, 2 - three-axis induction magnetic probe, 3 - signal transmission bus, 4 - oscilloscope, 5 - boundary of the high-frequency rotating magnetic field region to be measured. DETAILED DESCRIPTION

[0018] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0019] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0020] In the present application, the terms "up", "down", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0021] In addition, in addition to being used to indicate the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "up" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0022] In addition, the meaning of the term "a plurality of" should be two and more than two.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 As shown, this application provides a transient magnetic field configuration measurement system for a high-frequency rotating magnetic field, including a high-frequency rotating magnetic field 1 to be measured, a triaxial induction magnetic probe 2, a signal transmission bus 3, and an oscilloscope 4. Multiple triaxial induction magnetic probes 2 are evenly distributed within the high-frequency rotating magnetic field 1 to sense magnetic field signals. One end of the signal transmission bus 3 is fixed at the boundary 5 of the region of the high-frequency rotating magnetic field to be measured, and the other end is connected to the oscilloscope 4 for transmitting the sensed magnetic field signals. The signal transmission line of each triaxial induction magnetic probe 2 is connected to the signal transmission bus 3. The oscilloscope 4 has an internal data processing system for collecting and processing the sensed magnetic field signals, and displaying the configuration and dynamic changes of the high-frequency rotating magnetic field 1 in real time.

[0025] Specifically, the transient magnetic field configuration measurement system for high-frequency rotating magnetic fields provided in this application embodiment is mainly for measuring the transient configuration of high-frequency rotating magnetic fields, i.e., the rotation frequency of the magnetic field is between 10-1000kHz. When measuring the rotating magnetic field of an FRC electromagnetic thruster in a space or ground vacuum environment, the materials used in the system should comply with the requirements for materials used in vacuum cryogenic environments. The triaxial induction magnetic probe 2 is mainly used to sense the magnetic field signal of the high-frequency rotating magnetic field 1 to be measured. Vector operations on the magnetic field signal can obtain the magnitude and direction of the magnetic field in the current detection area. Multiple triaxial induction magnetic probes 2 are arranged in a planar or spatial array at a certain density. Subsequently, the magnitude and direction of the magnetic field detected by each array point are connected by interpolation to obtain the transient magnetic field configuration. During operation, the induced magnetic field signals from each triaxial magnetic probe 2 are converged and transmitted to the signal transmission bus 3. The signal transmission bus 3 then transmits the induced magnetic field signals to the oscilloscope 4. The oscilloscope 4 is equipped with a data processing system. By combining the induced signals from the triaxial magnetic probe array 2 with the coordinate positions of the magnetic probes, the transient magnetic field configuration is calculated. Then, by selecting an appropriate time interval to collect multiple transient magnetic field configurations, the dynamic changes of the magnetic field over a period of time can be obtained. In addition, the data processing system can also be set up in dedicated equipment such as computers. By connecting the oscilloscope 4 to dedicated equipment, the comprehensive and accurate measurement of magnetic field data can be achieved.

[0026] Furthermore, the high-frequency rotating magnetic field 1 to be measured is a time-varying dynamic magnetic field synthesized by two-phase or multi-phase resonant magnetic fields according to their phase difference. Its measurable frequency range is 0-1.0MHz, and its magnetic field strength is 0-1T. In the embodiments of this application, the high-frequency rotating magnetic field 1 to be measured can be a two-phase, three-phase, multi-phase, or even a rotating magnetic field generated by the mechanical motion of a permanent magnet, whichever is selected according to the actual experimental conditions.

[0027] Further, the three-axis induction magnetic probe 2 is composed of three induction magnetic probes fixed along three axes of a space orthogonal coordinate system, the three induction magnetic probes are fixed perpendicularly to each other, and each magnetic probe can measure the magnetic field intensity of the current region. The three-axis induction magnetic probe 2 is composed of three induction magnetic probe heads fixed along orthogonal directions. In order to ensure the measurement accuracy, the size of the probe head is set to be small, generally less than 1 / 20 of the diameter of the region of the high-frequency rotating magnetic field 1 to be measured, and in order to ensure the high spatial resolution of the measurement, the array density of the three-axis induction magnetic probe 2 is generally set to be large. Each magnetic probe is mainly used for measuring the magnetic field intensity of the current region, and the subsequent data processing obtains the magnetic field size and direction of the current region.

[0028] Further, the response time of the oscilloscope 4 is in the order of femtoseconds. The oscilloscope 4 has the functions of collecting and displaying scanning data, and the time resolution thereof is in the order of femtoseconds, so it can be considered that the induction magnetic field signal can be collected in real time. The ability of the oscilloscope 4 to collect data in real time is the key to measuring the high-frequency rotating magnetic field configuration according to the application.

[0029] In addition, the application also provides a method for measuring the transient magnetic field configuration of a high-frequency rotating magnetic field. The three-axis induction magnetic probe 2 array is used to detect the transient magnetic field configuration in cooperation with the high-time-resolution oscilloscope 4 and the data processing system, which solves the problem of accurate measurement of the gigahertz rotating magnetic field configuration and provides technical support for magnetic field configuration optimization. The method comprises the following steps:

[0030] Step 1: The high-frequency rotating magnetic field 1 to be measured is known, the size of the induction magnetic probe head is selected according to the measurement accuracy requirement, three induction magnetic probes are assembled into a three-axis induction magnetic probe 2, a plurality of identical three-axis induction magnetic probes 2 are prepared for standby, and the geometric parameters of each probe head, as well as the parameters such as the number of turns, resistance, and inductance are recorded;

[0031] Step 2: According to the requirement of the spatial resolution of the measurement, a plurality of three-axis induction magnetic probes 2 are fixed and arranged in the region of the high-frequency rotating magnetic field 1 to be measured at a certain array density. The array density of the three-axis induction magnetic probe 2 determines the geometric accuracy of the final measurement.

[0032] Step 3: The signal transmission lines of each three-axis induction magnetic probe 2 in the array are concentrated, orderly and fixedly connected with the signal transmission bus 3 at the boundary 5 of the high-frequency rotating magnetic field 1 to be measured, and the signal transmission bus 3 is connected with the oscilloscope 4;

[0033] Step 4: The oscilloscope 4 starts to work and collects the induction magnetic field signal to obtain the change of the magnetic field size data within a period of time. The magnetic field size is obtained by time integration processing of the induction magnetic field signal change rate of the three-axis induction magnetic probe 2.

[0034] Step 5: the obtained magnetic field data, combined with the position coordinates of the three-axis magnetic probe, the number of turns, geometric parameters, resistance, inductance and other data are comprehensively processed to obtain the transient configuration of the high-frequency rotating magnetic field at a certain time. The transient configuration of the high-frequency rotating magnetic field is obtained by interpolation processing according to the magnetic field size measured by each three-axis induction magnetic probe 2, and then the magnetic field transient configuration at continuous time is arranged in time sequence to obtain the dynamic change of the magnetic field configuration.

[0035] Further, the high-frequency rotating magnetic field transient magnetic field configuration measurement system and method provided by the application, the three-axis induction magnetic probe 2 does not use additional power supply in the detection process, and the signal is transmitted by the induced current of the changing magnetic field, which does not interfere with the magnetic field, and the application is not only suitable for high-frequency rotating magnetic field transient configuration measurement, but also suitable for low-frequency rotating magnetic field and other time-varying, non-rotating magnetic field configuration measurement in principle.

[0036] The above only describes the preferred embodiments of the application and is not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A system for measuring the transient magnetic field configuration of a high frequency rotating magnetic field, characterized by, It comprises a high-frequency rotating magnetic field to be measured, three-axis inductive magnetic probes, a signal transmission bus and an oscilloscope, wherein: The multiple three-axis inductive magnetic probe arrays are uniformly distributed in the high-frequency rotating magnetic field to be measured, and are used for inductive magnetic field signal; One end of the signal transmission bus is fixed at the boundary of the high-frequency rotating magnetic field to be measured, and the other end is connected with the oscilloscope, and is used for transmission of the inductive magnetic field signal; The signal transmission line of each three-axis inductive magnetic probe is connected with the signal transmission bus; The three-axis inductive magnetic probe is composed of three inductive magnetic probes fixed along three axes of a space rectangular coordinate system, and the three inductive magnetic probes are fixed perpendicularly to each other, and each magnetic probe can measure the magnetic field intensity of the current region; The response time of the oscilloscope is femtosecond order; The oscilloscope is internally provided with a data processing system, which is used for collection and processing of the inductive magnetic field signal, and real-time display of the configuration and dynamic change of the high-frequency rotating magnetic field to be measured, wherein: The magnetic field size is obtained by time integral processing of the inductive magnetic field signal change rate of the three-axis inductive magnetic probe, that is, vector operation on the magnetic field signal can obtain the magnetic field size and direction of the current detection region; The transient configuration of the high-frequency rotating magnetic field is obtained by interpolation processing of the magnetic field size measured by each three-axis inductive magnetic probe, that is, the magnetic field size and direction detected by each array point are connected by the interpolation method, and the transient magnetic field configuration can be obtained; And the transient magnetic field configuration is calculated by the inductive signal of the three-axis inductive magnetic probe array and the coordinate position of the magnetic probe, and then a plurality of transient magnetic field configurations are collected by selecting appropriate time intervals, and the dynamic change of the magnetic field in a period of time can be obtained.

2. The transient magnetic field pattern measurement system of a high frequency rotating magnetic field according to claim 1, characterized in that, The high-frequency rotating magnetic field to be measured is a time-varying dynamic magnetic field synthesized by two-phase or multi-phase resonant magnetic fields according to a phase difference, and the measurable frequency range is 0-1.0 MHz, and the magnetic field intensity is 0-1T.

3. A method of applying the transient magnetic field pattern measurement system of any one of claims 1-2, characterized in that, It comprises the following steps: Step 1: The size of the inductive magnetic probe head is selected according to the measurement accuracy requirement, three inductive magnetic probes are assembled into a three-axis inductive magnetic probe, and multiple identical three-axis inductive magnetic probes are prepared for standby; Step 2: According to the requirement of the spatial resolution of the measurement, multiple three-axis inductive magnetic probes are fixed and arranged in the high-frequency rotating magnetic field region according to a certain array density; Step 3: The signal transmission lines of each three-axis inductive magnetic probe in the array are concentrated, ordered and fixed at the signal transmission bus at the boundary of the high-frequency rotating magnetic field region, and the signal transmission bus is connected with the oscilloscope; Step 4: The oscilloscope starts to work, collects the inductive magnetic field signal, and obtains the data change of the magnetic field size in a period of time; Step 5: The obtained magnetic field data is processed to obtain the transient configuration of the high-frequency rotating magnetic field at a certain time, and then the magnetic field transient configurations of continuous time are arranged in time sequence to obtain the dynamic change of the magnetic field configuration.

4. The method of claim 3, wherein the transient magnetic field configuration measurement system using a high frequency rotating magnetic field is characterized by, In step 2, the array density of the three-axis inductive magnetic probe determines the geometric accuracy of the final measurement.

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