阅读说明：本技术 一种等离子体中尘埃颗粒的捕获装置 (Dust particle capturing device in plasma ) 是由 袁承勋 丁哲 姚静锋 周忠祥 李书博 库德里亚夫谢夫·安纳托利 于 2020-12-01 设计创作，主要内容包括：本发明提出了一种等离子体中尘埃颗粒的捕获装置,属于等离子体领域。解决了现有研究和设备中对等离子体系统中尘埃颗粒捕获困难的问题。它包括所述辉光放电管为对称弯曲的结构,所述辉光放电管与放电管固定装置相连,围绕弯曲部位自由旋转并固定,所述辉光放电管内部两端对称设置有空心阳极和空心阴极,所述空心阳极和空心阴极分别与直流电源的正负极相连,所述辉光放电管内部对称位置均设置有尘埃注入装置,所述辉光放电管与真空泵和气体注入装置相连,所述朗缪尔探针设置在辉光放电管内部并与数据收集系统相连,所述激光器和高速相机沿辉光放电管径向对称设置。它主要用于等离子体中尘埃颗粒的捕获。(The invention provides a device for capturing dust particles in plasma, and belongs to the field of plasma. The problem of in current research and the equipment dust particle capture difficulty in the plasma system is solved. The device comprises a symmetrically bent glow discharge tube, wherein the glow discharge tube is connected with a discharge tube fixing device, freely rotates and is fixed around a bent part, hollow anodes and hollow cathodes are symmetrically arranged at two ends in the glow discharge tube, the hollow anodes and the hollow cathodes are respectively connected with the anode and the cathode of a direct current power supply, dust injection devices are arranged at symmetrical positions in the glow discharge tube, the glow discharge tube is connected with a vacuum pump and a gas injection device, a Langmuir probe is arranged in the glow discharge tube and is connected with a data collection system, and a laser and a high-speed camera are symmetrically arranged along the radial direction of the glow discharge tube. It is mainly used for capturing dust particles in plasma.)

1. A device for trapping airborne particles in plasma, comprising: the device comprises a hollow anode (1a), a hollow cathode (1b), a vacuum pump (2), a dust injection device (3), a direct current power supply (4), a data collection system (5), a Langmuir probe (6), a glow discharge tube (7), a gas injection device (10), a discharge tube fixing device (11), a laser (12) and a high-speed camera (13); the glow discharge tube (7) is of a symmetrically bent structure, the glow discharge tube (7) is connected with a discharge tube fixing device (11) and freely rotates and is fixed around the bent part, the two ends of the interior of the glow discharge tube (7) are symmetrically provided with a hollow anode (1a) and a hollow cathode (1b), the hollow anode (1a) and the hollow cathode (1b) are respectively connected with the anode and the cathode of the direct current power supply (4), dust injection devices (3) are arranged at symmetrical positions in the glow discharge tube (7), the glow discharge tube (7) is connected with a vacuum pump (2) and a gas injection device (10), the Langmuir probe (6) is arranged inside the glow discharge tube (7) and is connected with the data collection system (5), the laser (12) and the high-speed camera (13) are arranged symmetrically along the radial direction of the light discharge tube (7).

2. A device for trapping airborne particles in plasma according to claim 1, wherein: the glow discharge tube (7) is a V-shaped quartz tube which is symmetrically bent, and the bending angle is 90 degrees.

3. A device for trapping airborne particles in plasma according to claim 1, wherein: the outer diameter of the light discharge tube (7) is 30mm, the wall thickness is 2mm, and the total length is 450 mm.

4. A device for trapping airborne particles in plasma according to claim 1, wherein: the vacuum degree in the light discharge tube (7) is in the range of 0.1torr to 1 torr.

5. A device for trapping airborne particles in plasma according to claim 1, wherein: the hollow anode (1a) and the hollow cathode (1b) are metal molybdenum sheet open cylinders.

6. A device for trapping airborne particles in plasma according to claim 5, wherein: the hollow anode (1a) and the hollow cathode (1b) are 2mm in thickness, 24mm in diameter and 30mm in length.

7. A device for trapping airborne particles in plasma according to claim 1, wherein: an ammeter (8) is connected in series to the direct current power supply (4), and a voltmeter (9) is connected in parallel to the direct current power supply (4).

8. A device for trapping airborne particles in plasma according to claim 1, wherein: and resistors (14) are connected in series between the hollow anodes (1a) and the hollow cathodes (1b) and the direct current power supply (4).

9. A device for trapping airborne particles in plasma according to claim 1, wherein: the dust injection device (3) injects dust particles into the plasma in a mechanical vibration mode.

10. A device for trapping airborne particles in plasma according to claim 1, wherein: the direct current power supply (4) provides 0-1500V adjustable voltage and 0-200 mA adjustable current.

Technical Field

The invention belongs to the field of plasmas, and particularly relates to a capturing device for dust particles in plasmas.

Background

The plasma is generated by means of high temperature, high pressure and the like, long-range force among charged particles plays a leading role, and ionized gas with collective effect is generally in an electrically neutral property and is often called as a fourth state of a substance. The electric field and magnetic field environment inside the plasma is very complicated because the plasma contains a large amount of charged particles (positive ions, negative ions and electrons) and neutral particles (atoms, molecules, radicals and active groups).

Dust particles carry a certain amount of charge inside the plasma due to the presence of the electric field. Meanwhile, the charged dust particles can be influenced by the electric field and the magnetic field in the plasma, and present a complex distribution condition in the plasma, so that the application of the plasma in engineering is greatly hindered. At present, as the current scientific and engineering means are still not perfect, the capture means for the particle movement of dust inside the plasma is still lacking. Therefore, it is urgently needed to develop a simple and effective device for capturing dust particles in plasma.

Disclosure of Invention

The invention provides a device for capturing dust particles in plasma, which aims to solve the problems in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: a device for capturing dust particles in plasma comprises a hollow anode, a hollow cathode, a vacuum pump, a dust injection device, a direct current power supply, a data collection system, a Langmuir probe, a glow discharge tube, a gas injection device, a discharge tube fixing device, a laser and a high-speed camera; the device comprises a glow discharge tube, a laser, a high-speed camera and a vacuum pump, wherein the glow discharge tube is of a symmetrically bent structure, the glow discharge tube is connected with a discharge tube fixing device, freely rotates and is fixed around a bent part, hollow anodes and hollow cathodes are symmetrically arranged at two ends in the glow discharge tube, the hollow anodes and the hollow cathodes are respectively connected with the anode and the cathode of a direct-current power supply, dust injection devices are arranged at symmetrical positions in the glow discharge tube, the glow discharge tube is connected with the vacuum pump and the gas injection devices, the Langmuir probe is arranged in the glow discharge tube and is connected with a data collection system, and the laser and the high-speed camera are symmetrically.

Furthermore, the light discharge tube is a V-shaped quartz tube which is symmetrically bent, and the bending angle is 90 degrees.

Furthermore, the glow discharge tube has an outer diameter of 30mm, a wall thickness of 2mm and a total length of 450 mm.

Further, the vacuum degree in the glow discharge tube is in the range of 0.1torr to 1 torr.

Furthermore, the hollow anode and the hollow cathode are metal molybdenum sheet open cylinders.

Further, the hollow anode and the hollow cathode have a thickness of 2mm, a diameter of 24mm and a length of 30 mm.

Furthermore, an ammeter is connected in series to the direct current power supply, and a voltmeter is connected in parallel to the direct current power supply.

Furthermore, resistors are connected in series between the hollow anode and the hollow cathode and the direct current power supply.

Further, the dust injection device injects dust particles into the plasma by mechanical vibration.

Furthermore, the DC power supply provides an adjustable voltage of 0-1500V and an adjustable current of 0-200 mA.

Compared with the prior art, the invention has the beneficial effects that: the invention solves the problem that dust particles in a plasma system are difficult to capture in the existing research and equipment. The invention adopts the glow discharge method to generate plasmas with different densities in the glow discharge tube by adjusting the voltage of the direct current power supply, and can freely rotate around the bending part through the discharge tube fixing device, thereby realizing the balance between the gravity of dust particles and the electromagnetic force received in the plasmas, and then the dust particles are captured by the plasmas, and dust images are obtained by a high-speed camera through a laser. Simultaneously, parameters of plasmas under different conditions are researched through the Langmuir probe and the data acquisition system, and a specific mechanism for capturing dust particles in the plasmas is further researched, so that the accuracy of the device is improved.

Drawings

FIG. 1 is a schematic structural diagram of a device for capturing dust particles in plasma according to the present invention;

FIG. 2 is a diagram showing the results of numerical simulation of the electric field force exerted on airborne particles in a radial electric field in a glow discharge tube according to the present invention.

1 a-hollow anode, 1 b-hollow cathode, 2-vacuum pump, 3-dust injection device, 4-DC power supply, 5-data collection system, 6-Langmuir probe, 7-glow discharge tube, 8-ammeter, 9-voltmeter, 10-gas injection device, 11-discharge tube fixture, 12-laser, 13-high speed camera, 14-resistor.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely explained below with reference to the drawings in the embodiments of the present invention.

Referring to fig. 1-2 to illustrate the present embodiment, a device for capturing dust particles in plasma includes a hollow anode 1a, a hollow cathode 1b, a vacuum pump 2, a dust injection device 3, a dc power supply 4, a data collection system 5, a langmuir probe 6, a glow discharge tube 7, a gas injection device 10, a discharge tube holder 11, a laser 12, and a high-speed camera 13; the glow discharge tube 7 is of a symmetrical bent structure, the glow discharge tube 7 is connected with a discharge tube fixing device 11, freely rotates and is fixed around a bent part, hollow anodes 1a and hollow cathodes 1b are symmetrically arranged at two ends inside the glow discharge tube 7, the hollow anodes 1a and the hollow cathodes 1b are respectively connected with the positive electrode and the negative electrode of a direct current power supply 4, dust injection devices 3 are arranged at symmetrical positions inside the glow discharge tube 7, the glow discharge tube 7 is connected with a vacuum pump 2 and a gas injection device 10, a Langmuir probe 6 is arranged inside the glow discharge tube 7 and is connected with a data collection system 5, and a laser 12 and a high-speed camera 13 are symmetrically arranged along the radial direction of the glow discharge tube 7.

In this embodiment, two sides of the glow discharge tube 7 are symmetrically provided with 4 openings, the dust injection device 3, the hollow anode 1a and the hollow cathode 1b are respectively and symmetrically arranged, plasmas with different densities are generated in the glow discharge tube 7 by adjusting the voltage of the direct current power supply 4 and adopting a glow discharge method, the gas injection device 10 injects different gas environments into the glow discharge tube 7, the dust injection device 3 injects dust particles into the plasmas in a mechanical vibration mode, and a dust image is obtained by the high-speed camera 13 through the laser 12. Plasma parameters are diagnosed by the langmuir probe 6 and collected and processed by the data collection system 5.

The dust particles are subjected to the following forces inside the plasma:

gravity: f_g＝m_dg

Electric field force:

friction force:

thermophoretic force:

ion drag force:

in the direct current glow discharge, the gravity and the electric field force of dust particles play a dominant role, and other acting forces can be ignored. The glow discharge tube 7 can rotate freely around the bending part under the action of the discharge tube fixing device 11, so that the mutual balance of the gravity and the electric field force borne by the dust particles is realized, and the dust particles in the plasma are captured.

The light discharge tube 7 of the present embodiment is a V-shaped quartz tube bent symmetrically, and has a bending angle of 90 °, an outer diameter of 30mm, a wall thickness of 2mm, and a total length of 450mm, and the dust particle image can be obtained by the high-speed camera 13 with a good ratio of the outer diameter to the length. The glow discharge tube 7 is externally connected with the vacuum pump 2, the periphery of the glow discharge tube is sealed by sealant, so that the vacuum degree in the glow discharge tube 7 is controlled within a condition range suitable for the generation of glow discharge plasma, and the vacuum degree in the glow discharge tube 7 is 0.1torr to 1 torr. The hollow anode 1a and the hollow cathode 1b are metal molybdenum open cylinders having a thickness of 2mm, a diameter of 24mm and a length of 30mm in order to generate a direct current glow discharge plasma within the glow discharge tube 7. The hollow anode 1a and the hollow cathode 1b are connected to the positive electrode and the negative electrode of the direct current power supply 4, the direct current power supply 4 provides 0-1500V adjustable voltage and 0-200 mA adjustable current, an ammeter 8 is connected in series to the direct current power supply 4 for visually observing the output current condition of the direct current power supply 4, a voltmeter 9 is connected in parallel to the direct current power supply 4 for visually observing the output voltage condition of the direct current power supply 4, and a resistor 14 is connected in series between the hollow anode 1a and the hollow cathode 1b and between the direct current power supply 4 for protecting the safety of the experimental device. In order to obtain the actual discharge of the plasma, plasma parameters were diagnosed by the langmuir probe 6 and collected and processed by the data collection system 5.

The present invention provides a device for capturing dust particles in plasma, which is described above in detail, and the principle and the embodiment of the present invention are explained herein by using specific examples, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.