Measurement device for magnetic induction intensity distribution inside an inductively pulsed plasma thruster

Abstract

This invention provides a measuring device for the magnetic induction intensity distribution inside an inductively pulsed plasma thruster, relating to the technical field of measuring magnetic induction intensity inside an inductively pulsed plasma thruster. The device includes: a calculation component, a magnetic probe fixing component, multiple magnetic probes, and multiple sets of measuring components. Each magnetic probe includes: multiple inductor coils arranged at preset intervals; each inductor coil corresponds to a set of measuring components; each set of measuring components includes: a twisted pair cable, a passive integrating circuit, a signal transmission cable, and an oscilloscope. Multiple magnetic probes are arranged axially along the cavity of the inductively pulsed plasma thruster and are parallel to each other, and are uniformly fixed in the upper half of the cavity by the magnetic probe fixing component. The ends of the multiple magnetic probes are all located on the center line of the cavity. Therefore, multiple magnetic probes can achieve full coverage of the spatial magnetic field measurement inside the cavity of the inductively pulsed plasma thruster, and the magnetic induction intensity distribution inside the inductively pulsed plasma thruster can be obtained through measurement.

Description

Technical Field

[0001] This invention relates to the technical field of measuring magnetic induction intensity inside an inductively pulsed plasma thruster, and in particular to a measuring device for the distribution of magnetic induction intensity inside an inductively pulsed plasma thruster. Background Technology

[0002] To meet the mission requirements of deep space exploration, space electric propulsion technologies, characterized by long lifespan and high specific impulse, such as Hall thrusters and ion thrusters, are rapidly developing. Compared to traditional continuous thrusters like Hall thrusters and ion thrusters, inductively pulsed plasma thrusters are electrodeless electromagnetic thrusters, eliminating electrode ablation issues, and offering advantages such as high specific impulse, high efficiency, high power, and the ability to use diverse working fluids. However, inductively pulsed plasma thrusters, especially field-inverse configuration inductively pulsed plasma thrusters, operate in pulse mode, resulting in rapid plasma generation and dissipation, causing high-frequency changes in the magnetic field in space on the order of MHz. During operation, the distribution of the space electromagnetic field has a significant impact on the thruster's thrust, efficiency, specific impulse, and total impulse. For example, the thrust of the thruster is related to the magnitude of the angular current, which in turn depends on the frequency of the rotating magnetic field generated by the rotating magnetic field antenna. Therefore, there is an urgent need for an effective and reliable diagnostic measurement device to measure the spatial distribution of the high-frequency magnetic field magnetic induction intensity inside the thruster, in order to evaluate the thruster's performance and conduct subsequent improvements. Summary of the Invention

[0003] The purpose of this invention is to provide a measuring device for the magnetic induction intensity distribution inside an inductive pulse plasma thruster, so as to provide an effective and reliable device for measuring the spatial distribution of the magnetic induction intensity of a high-frequency magnetic field inside the thruster.

[0004] In a first aspect, the present invention provides a measuring device for the magnetic induction intensity distribution within an inductively pulsed plasma thruster, comprising: a calculation component, a magnetic probe fixing component, multiple magnetic probes, and multiple sets of measuring components; each magnetic probe includes: multiple inductor coils arranged at preset intervals; each inductor coil corresponds to a set of measuring components; each set of measuring components includes: a twisted pair cable, a passive integrating circuit, a signal transmission cable, and an oscilloscope; multiple magnetic probes are arranged axially along the cavity of the inductively pulsed plasma thruster and are parallel to each other, and are uniformly fixed in the upper half of the cavity by the magnetic probe fixing component, and the ends of the multiple magnetic probes are all located on the center line of the cavity; the two ends of each inductor coil are connected to the input terminal of the passive integrating circuit through the twisted pair cable, and the output terminal of the passive integrating circuit is connected to the oscilloscope through the signal transmission cable; the passive integrating circuit, the signal transmission cable, the oscilloscope, and the calculation component are all located outside the cavity; the calculation component acquires the signal voltage of each oscilloscope, and determines the magnetic induction intensity at the spatial location of each inductor coil based on the signal voltage, the time constant of the passive integrating circuit, and the sensitivity of the inductor coil, thereby obtaining the magnetic induction intensity distribution within the inductively pulsed plasma thruster.

[0005] Optionally, the magnetic probe is a PCB circuit board with multiple inductor coils soldered on its surface at preset intervals, and the multiple inductor coils are arranged in the same direction.

[0006] Optionally, it also includes: multiple quartz protective sleeves; each magnetic probe is fitted with a quartz protective sleeve.

[0007] Optionally, each quartz protective sleeve is closed at the bottom and open at the top, with the opening being a boss structure with a groove. After each quartz protective sleeve is inserted into the magnetic probe fixing assembly, the groove and the limiting boss on the magnetic probe fixing assembly are complementaryly connected.

[0008] Optionally, the grooved boss includes a first groove and a second groove, which are respectively located on both sides of the opening.

[0009] Optionally, the magnetic probe fixing assembly includes: a fixing rod, a fixing plate, and a glass cover plate; the fixing rod has a groove structure and is attached to the inner surface of the upper half of the cavity for connection with multiple quartz protective sleeves; the glass cover plate is used to cover the groove structure of the fixing rod; the fixing plate is fixedly connected to the edge of the cavity and the fixing rod respectively; a hole is opened at the connection between the fixing rod and the fixing plate to allow the twisted pair cable to be led out from the inside of the cavity to the passive integrating circuit through the hole.

[0010] Optionally, the passive integrating circuit includes: a resistor and a capacitor; the first end of the resistor is connected to the first lead of the twisted pair cable, and the second end of the resistor is connected to the first end of the capacitor and the first input end of the signal transmission cable; the second end of the capacitor is connected to the second lead of the twisted pair cable and the second input end of the signal transmission cable respectively.

[0011] Optionally, the cutoff frequency of the passive integrator circuit is N times the frequency of the magnetic field inside the induced pulse plasma thruster, where N is less than 1.

[0012] Optionally, the inductor coil is a coreless coil.

[0013] Secondly, the present invention provides a method for measuring the magnetic flux density distribution within an inductively pulsed plasma thruster, applicable to the measuring device for the magnetic flux density distribution within an inductively pulsed plasma thruster according to any of the foregoing embodiments, comprising: acquiring the time constant of a passive integrating circuit and the sensitivity of an inductor coil in the measuring device for the magnetic flux density distribution within an inductively pulsed plasma thruster; acquiring the signal voltage of each oscilloscope in the measuring device for the magnetic flux density distribution within an inductively pulsed plasma thruster; determining the magnetic flux density at the spatial location of each inductor coil based on the signal voltage, the time constant of the passive integrating circuit, and the sensitivity of the inductor coil, thereby obtaining the magnetic flux density distribution within the inductively pulsed plasma thruster.

[0014] This invention provides a device for measuring the magnetic field distribution within an inductively pulsed plasma thruster. The device includes a calculation component, a magnetic probe fixing component, multiple magnetic probes, and multiple sets of measurement components. Each magnetic probe includes multiple inductor coils arranged at preset intervals. Each inductor coil corresponds to a set of measurement components. Each set of measurement components includes a twisted pair cable, a passive integrating circuit, a signal transmission cable, and an oscilloscope. The multiple magnetic probes are arranged axially along the cavity of the inductively pulsed plasma thruster and are parallel to each other. They are uniformly fixed in the upper half of the cavity by the magnetic probe fixing component, and the ends of the multiple magnetic probes are all located on the center line of the cavity. Therefore, the multiple magnetic probes can achieve full coverage of the spatial magnetic field measurement within the cavity of the inductively pulsed plasma thruster. During the measurement process, the induced electromotive force generated by each inductor coil is integrated by the passive integrating circuit and then input to the oscilloscope. The calculation component acquires the signal voltage from each oscilloscope. Based on the signal voltage, the time constant of the passive integrating circuit, and the sensitivity of the inductor coil, the magnetic field intensity at the spatial location of each inductor coil can be determined, thereby obtaining the magnetic field distribution within the inductively pulsed plasma thruster. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1An isometric view of a field-reversing plasma thruster cavity provided in an embodiment of the present invention;

[0017] Figure 2 A plurality of magnetic probes provided in an embodiment of the present invention are used in... Figure 1 The isometric view of the cavity shown;

[0018] Figure 3 A plurality of magnetic probes provided in an embodiment of the present invention are used in... Figure 1 A half-sectional view of the cavity shown;

[0019] Figure 4 A circuit schematic diagram of an inductor coil and its corresponding measuring components provided for an embodiment of the present invention;

[0020] Figure 5 An isometric view of a magnetic probe composed of a PCB circuit board and an inductor coil provided in an embodiment of the present invention;

[0021] Figure 6 An isometric view of a quartz protective sleeve provided in an embodiment of the present invention;

[0022] Figure 7 An isometric view of a magnetic probe fixing assembly provided in an embodiment of the present invention.

[0023] Icons: 100-Magnetic probe mounting assembly; 200-Magnetic probe; 300-Twisted pair cable; 400-Passive integrating circuit; 500-Signal transmission cable; 600-Oscilloscope; 700-Quartz protective sleeve; 201-Inductor coil; 101-Fixing rod; 102-Fixing plate; 103-Glass cover. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0026] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] Example 1

[0028] This invention provides a device for measuring the magnetic induction intensity distribution inside an inductively pulsed plasma thruster, comprising: a calculation component, a magnetic probe fixing component 100, multiple magnetic probes 200, and multiple sets of measurement components.

[0029] Each magnetic probe includes: multiple inductor coils 201 arranged at preset intervals; each inductor coil corresponds to a set of measurement components; each set of measurement components includes: twisted pair cable 300, passive integrator circuit 400, signal transmission cable 500 and oscilloscope 600.

[0030] Multiple magnetic probes are arranged axially and parallel to each other along the cavity of the induction pulse plasma thruster, and are uniformly fixed in the upper half of the cavity by a magnetic probe fixing assembly, with the ends of the multiple magnetic probes located on the center line of the cavity.

[0031] Figure 1 This is an isometric view of a field-reversing plasma thruster cavity provided in an embodiment of the present invention. Figure 2 A plurality of magnetic probes provided in an embodiment of the present invention are used in... Figure 1 The isometric view of the cavity shown. Figure 3 A plurality of magnetic probes provided in an embodiment of the present invention are used in... Figure 1 The image shows a half-sectional view of the cavity. It should be noted that the measuring device provided in this embodiment of the invention is suitable for measuring the magnetic induction intensity in cavities of various shapes (short for cavities of inductively pulsed plasma thrusters). Figure 1 The shape of one cavity is shown only as an example.

[0032] In the measuring device provided in this embodiment of the invention, all magnetic probes are arranged parallel to each other and uniformly along the axial direction in the upper half of the cavity through the magnetic probe fixing assembly. The top of all magnetic probes is close to the inner wall of the cavity, and the bottom (i.e., the end) is located on the center line of the cavity. In other words, the line connecting the ends of all magnetic probes is the center line of the cavity.

[0033] Figure 3In the illustrated measuring device, there are three magnetic probes, each with an inductor coil spaced 5 mm apart. The three magnetic probes are equipped with 9, 12, and 15 inductors respectively. This embodiment of the invention does not specifically limit the number of magnetic probes or the number of inductors on each probe. Users need to adapt the number of magnetic probes according to the size of the cavity and the required magnetic flux density resolution. Obviously, the larger the size, the more magnetic probes and inductors are needed; the higher the resolution requirement, the more magnetic probes and inductors are needed. However, if the spacing between the inductors is too small, mutual interference will occur. Therefore, by reasonably designing the spacing between the magnetic probes and the spacing between the inductors on each probe, the spatial resolution of the magnetic flux density measurement within the cavity can be guaranteed. This embodiment of the invention achieves full coverage of the spatial magnetic field measurement within the cavity by arranging multiple magnetic probes along the axial direction to form a magnetic probe array.

[0034] Before calculating the magnetic flux density, the sensitivity of the inductor coil needs to be determined in advance. To simplify the calibration process, the inductor coil in this embodiment is a coreless coil. The sensitivity can also be obtained by consulting the manufacturer. To reduce the size of the magnetic probe and minimize interference with the plasma, as well as to improve the measurement accuracy of the magnetic field strength, the smaller the inductor coil, the better. It is known that the inductance value of the inductor coil affects its sensitivity. If the inductance value is too small, the output voltage will be too low, resulting in a decreased signal-to-noise ratio; if the inductance value is too large, its size will increase accordingly. Therefore, users should select an inductor coil of appropriate size and inductance value according to their actual testing needs.

[0035] The two ends of each inductor coil are connected to the input of the passive integrator circuit via twisted-pair cables, and the output of the passive integrator circuit is connected to the oscilloscope via a signal transmission cable; the passive integrator circuit, signal transmission cable, oscilloscope, and computing components are all located outside the cavity.

[0036] The computing component acquires the signal voltage of each oscilloscope and, based on the signal voltage, the time constant of the passive integrator circuit, and the sensitivity of the inductor coil, determines the magnetic induction intensity at the spatial location of each inductor coil, thus obtaining the magnetic induction intensity distribution within the induced pulse plasma thruster.

[0037] Figure 4 This invention provides a circuit schematic diagram of an inductor coil and its corresponding measuring components, which is illustrated in an embodiment of the present invention. Figure 4 As can be seen, the output signal of the inductor coil is input into the passive integrator circuit through a twisted pair cable, and the output signal of the passive integrator circuit is transmitted to the oscilloscope through a signal transmission cable. Optionally, in order to shield electromagnetic interference, the twisted pair cable is made of copper enameled wire.

[0038] Oscilloscopes are known to have acquisition frequencies up to GHz, enabling them to acquire transient changes in the magnetic field at the same point in space during pulsed plasma thruster operation. This allows for performance evaluation and subsequent optimization. A computing component communicates with the oscilloscopes to acquire the signal voltages connected to each oscilloscope. Based on the signal voltages, the time constant of the passive integrator circuit, and the sensitivity of the inductors, the magnetic flux density at each inductor's spatial location is calculated. This invention does not specifically limit the choice of computing component; any component capable of performing the aforementioned calculations is acceptable. The computing component can be a microcontroller, computer, etc.

[0039] The following is a detailed explanation of the principle by which the calculation component calculates magnetic field strength: According to Faraday's law of electromagnetic induction, an inductor coil will generate an induced electromotive force under the influence of a high-frequency magnetic field. ,in, This indicates the induced electromotive force. This represents the magnetic flux. Since the effective area of ​​the inductor is small enough that the magnetic field inside the cavity is approximately uniform, the induced electromotive force can be written as... ,in, This indicates the sensitivity of an inductor. Sensitivity is equal to the product of the number of turns and the cross-sectional area of ​​the inductor, and its unit is m. 2 , This represents the magnetic flux density. After being re-integrated by a passive integrator, the signal voltage input to the oscilloscope is obtained. ,in, This indicates the signal voltage of the oscilloscope. This represents the time constant of the passive integrator circuit. That is, the oscilloscope signal voltage and magnetic flux density are linearly related. Therefore, given the oscilloscope signal voltage, the time constant of the passive integrator circuit, and the sensitivity of the inductor coil, the magnetic flux density at a given moment at the corresponding spatial measurement point within the cavity (i.e., the location of the inductor coil) can be calculated using the above formula. The magnetic flux density at all spatial measurement points within the cavity constitutes the magnetic flux density distribution within the induced pulse plasma thruster.

[0040] This invention provides a device for measuring the magnetic field distribution within an inductively pulsed plasma thruster. The device includes a calculation component, a magnetic probe fixing component, multiple magnetic probes, and multiple sets of measurement components. Each magnetic probe includes multiple inductor coils arranged at preset intervals. Each inductor coil corresponds to a set of measurement components. Each set of measurement components includes a twisted pair cable, a passive integrating circuit, a signal transmission cable, and an oscilloscope. The multiple magnetic probes are arranged axially along the cavity of the inductively pulsed plasma thruster and are parallel to each other. They are uniformly fixed in the upper half of the cavity by the magnetic probe fixing component, and the ends of the multiple magnetic probes are all located on the center line of the cavity. Therefore, the multiple magnetic probes can achieve full coverage of the spatial magnetic field measurement within the cavity of the inductively pulsed plasma thruster. During the measurement process, the induced electromotive force generated by each inductor coil is integrated by the passive integrating circuit and then input to the oscilloscope. The calculation component acquires the signal voltage from each oscilloscope. Based on the signal voltage, the time constant of the passive integrating circuit, and the sensitivity of the inductor coil, the magnetic field intensity at the spatial location of each inductor coil can be determined, thereby obtaining the magnetic field distribution within the inductively pulsed plasma thruster.

[0041] In one alternative embodiment, the magnetic probe is a PCB circuit board with multiple inductor coils soldered to its surface at preset intervals, and the multiple inductor coils are arranged in the same direction.

[0042] Figure 5 This is an isometric view of a magnetic probe composed of a PCB circuit board and an inductor coil, provided as an embodiment of the present invention. Optionally, a pair of pads are provided on the PCB circuit board every 3-5 mm, and the two ends of the inductor coil are respectively soldered to the pads on the PCB circuit board. That is, the inductor coil is soldered to the pads on the PCB circuit board to form a magnetic probe. Optionally, the PCB circuit board is made of FR-4 grade material.

[0043] In one optional embodiment, the device further includes: a plurality of quartz protective sleeves 700; each magnetic probe is covered with a quartz protective sleeve.

[0044] Specifically, to prevent plasma from eroding the magnetic probe and to ensure the stability and reliability of its operation, this embodiment of the invention embeds the magnetic probe in a quartz protective sleeve. Optionally, the quartz protective sleeve is a quartz glass tube. The size of the quartz protective sleeve is minimized while ensuring that it does not interfere with the operation of the magnetic probe. Figure 3 As shown, all magnetic probes are arranged according to Figure 3 The probes are inserted into quartz glass tubes in the directions shown, forming an intervening magnetic probe array along the axial direction of the cavity of the field-reversing plasma thruster, achieving full coverage of magnetic field measurement points.

[0045] Figure 6This is an isometric view of a quartz protective sleeve proposed in an embodiment of the present invention. Each quartz protective sleeve is closed at the bottom and open at the top, and the opening is a boss structure with a groove. After each quartz protective sleeve is inserted into the magnetic probe fixing assembly, the groove and the limiting boss on the magnetic probe fixing assembly are complementaryly connected.

[0046] In other words, all quartz protective sleeves can be snapped onto the magnetic probe fixing assembly, allowing the quartz protective sleeves to move only in the vertical direction (inserting into the magnetic probe fixing assembly, or removing from the magnetic probe fixing assembly). Therefore, when measuring the magnetic induction intensity inside the cavity, the quartz protective sleeves will not move in other directions following the disturbance of the plasma, thus effectively avoiding test errors.

[0047] To ensure the stability of the engagement between the quartz protective sleeve and the magnetic probe fixing assembly, such as Figure 6 As shown, the boss with grooves includes a first groove and a second groove, which are respectively located on both sides of the opening.

[0048] In one alternative embodiment, the magnetic probe fixing assembly includes: a fixing rod 101, a fixing plate 102, and a glass cover plate 103.

[0049] The fixing rod has a groove structure and is attached to the inner surface of the upper half of the cavity for connecting with multiple quartz protective sleeves.

[0050] A glass cover is used to cover the grooved structure of the fixing rod.

[0051] The fixed plate is fixedly connected to the edge of the cavity and the fixed rod respectively.

[0052] A hole is made at the connection between the fixing rod and the fixing plate so that the twisted pair cable can be led out from the inside of the cavity to the passive integrating circuit through the hole.

[0053] Figure 7 This is an isometric view of a magnetic probe fixing assembly provided in an embodiment of the present invention. To improve the stability of the measuring device, the magnetic probe fixing assembly is made of a material with high stability in a plasma environment. Optionally, the magnetic probe fixing assembly consists of a high-silica fixing rod, an MC nylon fixing plate, and a glass cover. The glass cover covers the groove of the fixing rod to prevent plasma from interfering with the magnetic probe. Furthermore, the fixing rod and the fixing plate, as well as the fixing plate and the cavity, are connected by nylon bolts and nuts.

[0054] In one alternative implementation, the passive integrator circuit includes a resistor and a capacitor.

[0055] The first end of the resistor is connected to the first lead of the twisted pair cable, and the second end of the resistor is connected to the first end of the capacitor and the first input end of the signal transmission cable.

[0056] The second end of the capacitor is connected to the second lead of the twisted pair and the second input end of the signal transmission cable, respectively.

[0057] The cutoff frequency of the passive integrator circuit is N times the frequency of the magnetic field inside the induced pulse plasma thruster, where N is less than 1.

[0058] It is known that the larger the time constant of a passive integrator, the smaller the output voltage; conversely, the smaller the time constant, the worse the integration effect. When the cutoff frequency of the passive integrator is much smaller than the frequency of the magnetic field inside the induced pulse plasma thruster, the output voltage amplitude of the passive integrator can be considered much smaller than the input voltage amplitude. It can be approximated as ( For output voltage, (where the input voltage is used), at this time the integrator performs well and the output voltage amplitude is not too small.

[0059] Taking a measured high-frequency magnetic field in the MHz range as an example, the cutoff frequency of the passive integrator circuit can be selected as 0.1 times the frequency of the magnetic field inside the induced pulse plasma thruster, that is... ,in, This represents the time constant of a passive integrator circuit. This represents the resistance value in a passive integrator circuit. This indicates the capacitance value in the passive integrator circuit. Optionally, the passive integrator circuit consists of a 1kΩ metal film resistor and a 10nF ceramic capacitor.

[0060] In summary, by rationally designing the inductance of the inductor coil and the time constant of the passive integrator circuit in the measuring device, high-precision transient measurement of high-frequency magnetic fields of various magnitudes by the magnetic probe array can be achieved.

[0061] Example 2

[0062] This invention also provides a method for measuring the magnetic induction intensity distribution inside an inductively pulsed plasma thruster. This method is mainly applied to the measuring device for the magnetic induction intensity distribution inside an inductively pulsed plasma thruster provided in Embodiment 1 above. The method provided by this invention will be described in detail below.

[0063] The method for measuring the magnetic induction intensity distribution inside an inductively pulsed plasma thruster provided in this embodiment of the invention specifically includes the following steps:

[0064] First, the time constant of the passive integrator circuit and the sensitivity of the inductor coil in the measuring device for obtaining the magnetic induction intensity distribution inside the induced pulse plasma thruster are obtained.

[0065] Then, the signal voltage of each oscilloscope in the measuring device for the distribution of magnetic induction intensity inside the induced pulse plasma thruster is acquired.

[0066] Finally, based on the signal voltage, the time constant of the passive integrator circuit, and the sensitivity of the inductor coil, the magnetic induction intensity at the spatial location of each inductor coil is determined, thus obtaining the magnetic induction intensity distribution within the induced pulse plasma thruster.

[0067] The measurement principle of magnetic induction intensity distribution has been described in detail above, and will not be repeated here. For details, please refer to the description in Example 1.

[0068] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0069] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0070] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A measuring device for the distribution of magnetic induction intensity within an inductively pulsed plasma thruster, characterized in that, include: Computational components, magnetic probe fixing components, multiple magnetic probes, and multiple sets of measurement components; Each magnetic probe includes: a plurality of inductor coils arranged at preset intervals; each inductor coil corresponds to a set of measurement components; each set of measurement components includes: a twisted pair cable, a passive integrating circuit, a signal transmission cable, and an oscilloscope; The plurality of magnetic probes are arranged axially along the cavity of the induction pulse plasma thruster and are parallel to each other. They are uniformly fixed in the upper half of the cavity by the magnetic probe fixing assembly, and the ends of the plurality of magnetic probes are all located on the center line of the cavity. Each inductor coil has its two ends connected to the input terminal of the passive integrator circuit via the twisted pair cable, and the output terminal of the passive integrator circuit is connected to the oscilloscope via the signal transmission cable; the passive integrator circuit, the signal transmission cable, the oscilloscope, and the computing component are all located outside the cavity; The computing component acquires the signal voltage of each oscilloscope, and based on the signal voltage, the time constant of the passive integrator circuit, and the sensitivity of the inductor coil, determines the magnetic induction intensity at the spatial location of each inductor coil, thereby obtaining the magnetic induction intensity distribution within the induced pulse plasma thruster.

2. The measuring device for the magnetic induction intensity distribution within an inductively pulsed plasma thruster according to claim 1, characterized in that, The magnetic probe is a PCB circuit board with multiple inductor coils soldered to its surface at preset intervals, and the multiple inductor coils are arranged in the same direction.

3. The measuring device for the magnetic induction intensity distribution within an inductively pulsed plasma thruster according to claim 1, characterized in that, Also includes: Multiple quartz protective sleeves; Each of the magnetic probes is covered with a quartz protective sleeve.

4. The measuring device for the magnetic induction intensity distribution within an inductively pulsed plasma thruster according to claim 3, characterized in that, Each of the quartz protective sleeves is closed at the bottom and open at the top, with the opening being a boss structure with a groove. After each of the quartz protective sleeves is inserted into the magnetic probe fixing assembly, the groove is complementary to the limiting boss on the magnetic probe fixing assembly.

5. The measuring device for the magnetic induction intensity distribution within an inductively pulsed plasma thruster according to claim 4, characterized in that, The grooved boss includes a first groove and a second groove, which are respectively located on both sides of the opening.

6. The measuring device for the magnetic induction intensity distribution within an inductively pulsed plasma thruster according to claim 4, characterized in that, The magnetic probe fixing assembly includes: a fixing rod, a fixing plate, and a glass cover plate; The fixing rod has a groove structure and is attached to the inner surface of the upper half of the cavity for connecting with multiple quartz protective sleeves; The glass cover is used to cover the groove structure of the fixing rod; The fixing plate is fixedly connected to the edge of the cavity and the fixing rod, respectively; A hole is made at the connection between the fixing rod and the fixing plate so that the twisted pair cable can be led out from the inside of the cavity to the passive integrating circuit through the hole.

7. The measuring device for the magnetic induction intensity distribution within an inductively pulsed plasma thruster according to claim 1, characterized in that, The passive integrating circuit includes: resistors and capacitors; The first end of the resistor is connected to the first lead of the twisted pair, and the second end of the resistor is connected to the first end of the capacitor and the first input end of the signal transmission cable. The second end of the capacitor is connected to the second lead of the twisted pair and the second input end of the signal transmission cable, respectively.

8. The measuring device for the magnetic induction intensity distribution within an inductively pulsed plasma thruster according to claim 7, characterized in that, The cutoff frequency of the passive integrator circuit is N times the frequency of the magnetic field inside the induced pulse plasma thruster, where N is less than 1.

9. The measuring device for the magnetic induction intensity distribution within an inductively pulsed plasma thruster according to claim 1, characterized in that, The inductor coil is a coreless coil.

10. A method for measuring the magnetic induction intensity distribution within an inductively pulsed plasma thruster, characterized in that, A measuring device for measuring the magnetic induction intensity distribution within an inductively pulsed plasma thruster according to any one of claims 1-9, comprising: The time constant of the passive integrator circuit and the sensitivity of the inductor coil in the measuring device for obtaining the magnetic induction intensity distribution inside the induced pulse plasma thruster; The signal voltage of each oscilloscope in the measuring device for acquiring the magnetic induction intensity distribution inside the inductive pulse plasma thruster; Based on the signal voltage, the time constant of the passive integrator circuit, and the sensitivity of the inductor coil, the magnetic induction intensity at the spatial location of each inductor coil is determined, thereby obtaining the magnetic induction intensity distribution within the induced pulse plasma thruster.

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