Large-area high-irradiance ultraviolet irradiation device simulating the positive electrical environment of the lunar sunside

Abstract

The present invention proposes a large-area high-irradiance ultraviolet irradiation device for simulating the positive charge environment of the lunar sun side, which belongs to the field of space environment simulation technology. It solves the problem of realizing the simulation of the low-potential positive charge environment on the lunar surface, charging the lunar dust samples or test samples positively, studying the charging and discharging mechanism of micron / submicron dust under ultraviolet irradiation conditions and the environmental effect of charged dust, and carrying out theoretical research on lunar surface dust charging. The irradiation device includes a large ultraviolet flange, a plurality of ultraviolet irradiation sources, a plurality of position and attitude holding fixtures and a plurality of flange interfaces. The two large ultraviolet flanges are located at the upper part of the straight section of the lunar dust chamber. The angle between the interface axis and the axis of the main cylinder of the lunar dust chamber converges at the center of the focusing plane at 45°. Each large flange is provided with a plurality of flange interfaces, and each ultraviolet irradiation source is fixed on the flange interface through a position and attitude holding fixture. The present invention is used for simulating the charging environment on the lunar sun side, and can charge the dust or test samples on the irradiated surface with a low-voltage positive potential of about tens of volts.

Description

Technical Field

[0001] The invention belongs to the technical field of space environment simulation, and in particular relates to a large-area high-irradiance ultraviolet irradiation device for simulating the positive electrical environment of the lunar sunside. Background Art

[0002] Under the influence of sunlight, solar wind plasma and high-energy particle flow in space, the lunar surface and dust particles will be charged with electric potential of certain polarity and intensity. Charged lunar dust particles will be suspended to a certain height under the action of electrostatic force, forming a global three-dimensional distribution that can reach an altitude of nearly one kilometer. Electrostatically suspended dust will migrate under the action of the electric field on the lunar surface, which is particularly serious at the twilight plane, forming a lunar dust fountain phenomenon.

[0003] In order to simulate the lunar dust fountain phenomenon, a lunar dust charging system was established in the lunar dust cabin. The lunar dust charging system includes an ultraviolet radiation source, an X-ray source, and an electron accelerator. The ultraviolet radiation source charges the lunar dust with low-potential positive electricity, the X-ray source charges the lunar dust with high-potential positive electricity, and the electron accelerator charges the lunar dust with negative electricity. By establishing a large-area, high-irradiance ultraviolet radiation device that simulates the positive electrical environment on the lunar sunward side, the lunar dust cabin can realize the function of charging the lunar dust, thereby completing a series of experiments such as simulating lunar dust charging and lunar dust fountains. Summary of the invention

[0004] In order to realize the simulation of the low-potential positively charged environment on the lunar surface, the present invention is used to positively charge lunar dust samples or test samples, study the charging and discharging mechanism of micron / submicron dust under ultraviolet irradiation conditions and the environmental effect of charged dust, carry out theoretical research on lunar surface dust charging, and propose a large-area high-irradiance ultraviolet irradiation device that simulates the positively charged environment on the dayside of the moon, which is a part of the lunar dust charging system of the lunar dust cabin.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a large-area, high-irradiance ultraviolet irradiation device that simulates the positive electrical environment of the lunar sunside, comprising a large ultraviolet flange, a plurality of ultraviolet irradiation sources, a plurality of position and attitude holding tooling and a plurality of flange interfaces, two large ultraviolet flanges are located at the upper part of the straight cylinder section of the lunar dust chamber, and the angle between the interface axis and the axis of the lunar dust chamber cylinder converges at the center of the focusing plane at 45°, each large ultraviolet flange is provided with a plurality of flange interfaces, and each ultraviolet irradiation source is fixed to the flange interface through a position and attitude holding tooling.

[0006] Furthermore, the ultraviolet radiation source is a deuterium lamp.

[0007] Furthermore, 37 deuterium lamps are arranged radially in a hexagonal pattern.

[0008] Furthermore, each UV large flange has 37 flange interfaces.

[0009] Furthermore, 37 deuterium lamps are arranged on each large ultraviolet flange to form an irradiation surface with a diameter of Φ1000mm on the focusing plane of the lunar dust capsule. The distance between the Φ1000mm irradiation surface in the focusing plane and the reference ground of the lunar dust capsule container is 2400mm.

[0010] Furthermore, the maximum ultraviolet radiation intensity on the focusing plane is ≥3.5 vacuum ultraviolet constants. When 74 deuterium lamps are turned on at the same time, the irradiation surface with a diameter of 1000mm in the focusing plane of the lunar dust cabin can reach 4.15 vacuum ultraviolet constants.

[0011] Furthermore, the window of the deuterium lamp is made of MgF2 material.

[0012] Furthermore, the power of the deuterium lamp reaches 150W and the light is emitted from the top.

[0013] Furthermore, a cooling fan is installed at the rear end of the deuterium lamp, and the cooling fan provides air cooling for the deuterium lamp 2 to ensure that the deuterium lamp 2 is at a reliable working temperature under normal temperature and pressure working conditions.

[0014] Furthermore, the operating temperature of the deuterium lamp is 10-40°C.

[0015] Furthermore, the spectrum of the ultraviolet radiation of the deuterium lamp is continuous radiation, and the spectrum wavelength range is 100-200nm.

[0016] Compared with the prior art, the large-area high-irradiance ultraviolet irradiation device for simulating the positive electrical environment of the lunar sunward side according to the present invention has the following beneficial effects:

[0017] 1. The present invention is the ultraviolet irradiation device with the largest irradiation area in the world. It is used in a vacuum environment and can provide a vacuum ultraviolet irradiation environment that is 2.5 times that of the second largest device that can provide ultraviolet irradiation environment. The principle is that when the energy of a group of photons is greater than the photoelectric work function of dust particles, the photons are incident on the dust surface, and the dust particles will emit photoelectrons and become positively charged. Ultraviolet irradiation charges the moon dust particles in this way. At the same time, since the charge accumulates over time, the charge of the moon dust particles can reach the experimental requirements through long-term irradiation, achieving the expected experimental effect.

[0018] 2. The present invention is used to simulate the charging environment on the sun-facing side of the lunar surface, and can give the lunar dust a low-voltage positive potential of several tens of volts.

[0019] 3. In the large ultraviolet flange directly connected to the lunar dust chamber, the present invention utilizes a method of opening a flange interface on the large ultraviolet flange to achieve non-interference between the flange interfaces and achieve the effect of densely arranging deuterium lamps. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the structural framework of the moon dust cabin of the present invention;

[0022] Figure 2 This is a schematic diagram of the distribution of a large-area, high-irradiance ultraviolet irradiation device for simulating the positive electrical environment on the lunar sunside according to the present invention on the lunar dust cabin;

[0023] Figure 3 This is a schematic diagram of the structure framework of the ultraviolet radiation source of the present invention;

[0024] Figure 4 This is a schematic diagram of the composition of the deuterium lamp described in the present invention;

[0025] Figure 5 This is a front view of the ultraviolet large flange of the present invention;

[0026] Figure 6 It is a side view of the ultraviolet large flange of the present invention;

[0027] Figure 7 It is an axonometric view of the ultraviolet large flange described in the present invention;

[0028] Figure 8 is a side view of a single deuterium lamp according to the present invention;

[0029] Fig. 9 It is a schematic diagram of the structure of a single deuterium lamp according to the present invention;

[0030] In the figure: 1-position attitude holding tooling, 2-deuterium lamp, 3-flange interface, 4-ultraviolet large flange. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0032] 1. Specific implementation method 1, see Figure 1-9To illustrate this embodiment, a large-area, high-irradiance ultraviolet irradiation device that simulates the positive electrical environment of the lunar sunside includes a large ultraviolet flange 4, a plurality of ultraviolet irradiation sources, a plurality of position and attitude holding fixtures 1, and a plurality of flange interfaces 3. Two large ultraviolet flanges 4 are located at the upper part of the straight cylinder section of the lunar dust chamber, and the angle between the interface axis and the axis of the lunar dust chamber cylinder is 45°, converging at the center of the focusing plane. Each large ultraviolet flange 4 is provided with a plurality of flange interfaces 3, and each ultraviolet irradiation source is fixed to the flange interface 3 by a position and attitude holding fixture 1.

[0033] The ultraviolet radiation source is a deuterium lamp 2. Each ultraviolet large flange 4 is provided with 37 flange interfaces 3. The 37 deuterium lamps 2 are arranged radially in a hexagonal shape.

[0034] The position and attitude holding fixture 1 is composed of a thin circular plate and four vertical studs, the upper ends of the studs are connected to the thin circular plate, and the lower ends are connected to the flange interface 3. The position and attitude holding fixture 1 is installed from the rear of the deuterium lamp 2 to the flange interface 3, and the deuterium lamp 2 is buckled through a thin circular plate and bolt holes matched with the flange interface 3, so that the deuterium lamp 2 and the flange interface 3 maintain a fixed relative position.

[0035] The working principle of irradiation with deuterium lamp 2 is as follows: when deuterium lamp 2 is working, that is, the filament is energized and heated to emit free electrons, and voltage is applied to the anode. At this time, the free electrons move toward the anode under the acceleration of the electric field. In this process, the free electrons collide with the deuterium molecules inelastically, making the deuterium molecules in an excited state. When they return to their original state or lower energy state, they release energy in the form of radiation and emit light. Deuterium lamp 2 can generate continuous radiation within a wavelength of 100nm-200nm, the lower limit of which is determined by the line radiation of Raman molecules and the upper limit is limited by the Balmer line spectrum.

[0036] 37 deuterium lamps 2 are arranged on each large ultraviolet flange 4, forming an irradiation surface with a diameter of Φ1000mm on the focusing plane of the lunar dust chamber. The distance between the Φ1000mm irradiation surface in the focusing plane and the reference ground of the lunar dust chamber container is 2400mm.

[0037] The irradiation surface of Φ1000mm is designed to ensure that the experimental area is large enough to accommodate relevant experimental equipment. The height of 2400mm reserves the size of the bottom mobile platform that needs to be installed in the future.

[0038] The number of deuterium lamps 2 is sufficient and they are arranged in a hexagonal radial pattern, in order to ensure that the ultraviolet radiation is as uniform as possible on the irradiated surface, and to ensure that the irradiance on the irradiated surface gradually decreases from the inside to the outside. At the same time, due to the size of the large ultraviolet flange of the lunar dust chamber and the size of the deuterium lamps, and due to the heat dissipation requirements, the deuterium lamps 2 cannot be arranged too densely, so the number of deuterium lamps 2 is set at 74.

[0039] The maximum ultraviolet radiation intensity on the focusing plane is ≥3.5 vacuum ultraviolet constants. When 74 deuterium lamps 2 are turned on at the same time, the irradiation surface with a diameter of 1000mm in the focusing plane of the lunar dust cabin can reach 4.15 vacuum ultraviolet constants.

[0040] Moon dust particles of the same size are irradiated by ultraviolet sources of different irradiances. The greater the irradiance, the more charges on the surface of the moon dust; at the same time, the longer the irradiation time, the more charges on the moon dust. Therefore, the experiment is accelerated by increasing the irradiance and thus the charge on the surface of the moon dust. The 4.15 vacuum ultraviolet constants are the long-term stable irradiance that can be achieved at the edge of the irradiation surface under the irradiation of 74 deuterium lamps 2 arranged according to the design; the 3.5 vacuum ultraviolet constants are the long-term stable irradiance that can be achieved after considering the attenuation of the deuterium lamp 2 due to long-term operation or attenuation due to window pollution and other reasons.

[0041] Two ultraviolet radiation sources are installed on the upper part of the straight section of the lunar dust chamber. The angle between the axis of the flange interface 3 and the axis of the lunar dust chamber cylinder converges at the center of the focusing plane at 45°. A large ultraviolet flange 4 required for the installation of two ultraviolet radiation sources is provided.

[0042] The ultraviolet source is planned to use a 150W deuterium lamp 2 of the L11798LS MOD model as the light source, and a matching working power supply. This type of deuterium lamp is the same model as the deuterium lamp 2 of the integrated cabin ultraviolet irradiation system of the integrated environmental simulation subsystem - system-level integrated irradiation test cabin, ensuring the sharing of light sources. At the same time, air cooling is provided for the deuterium lamp 2 to ensure that the deuterium lamp 2 light source is at a reliable working temperature of 10 to 40°C; the deuterium lamp 2 and power supply, as well as the cooling system required by the ultraviolet source are shared by the integrated cabin ultraviolet irradiation system (SESRI.1.1.1.6) of the integrated environmental simulation subsystem - system-level integrated irradiation test cabin (SESRI.1.1.1) in actual applications; the selection, design, installation, commissioning, integration and acceptance of the ultraviolet deuterium lamp are completed according to actual conditions.

[0043] The 74 deuterium lamps 2 use special window MgF2 material, with a power of 150W and top light emission. The exterior of the deuterium lamp 2 is composed of a cylindrical metal and a cooling fan at the rear end. The cylindrical metal is used to dissipate heat on the side of the deuterium lamp 2. The equipped fan can provide air cooling for the deuterium lamp 2 to ensure that the deuterium lamp 2 light source is at a reliable working temperature (10-40°C) under normal temperature and pressure working conditions.

[0044] The ultraviolet source is detachable and connected to the lunar dust capsule container system by flange docking. There are two ultraviolet source interfaces with an inner diameter of Φ1100mm. Both are located at the upper part of the straight cylinder section of the lunar dust capsule container system. The axes of the ultraviolet light beams converge at the center of the focusing plane at an inclination angle of 45°. For the deformation error of the ultraviolet source interface of the lunar dust capsule container, the ultraviolet source must be adaptively designed.

[0045] The measurement and calibration system has the ability to measure optical performance, and can measure the optical performance parameters such as the irradiance and irradiation area of ​​the ultraviolet source; a) The vacuum degree of the lunar dust chamber is better than 1.5×10 -3 When the irradiation temperature is 10000 Pa, the photoelectric tube and the supporting measuring instruments are used to measure the irradiance of the ultraviolet irradiation system, so as to obtain the total irradiance of the 100-200nm ultraviolet radiation band within the irradiation surface with a diameter of Φ1000mm. The ultraviolet irradiation area is scanned and measured within the irradiation surface of the irradiation sample stage by a vacuum ultraviolet detector, so as to obtain the parameters such as the irradiation surface and irradiation unevenness of the ultraviolet irradiation system; b) The self-developed deuterium lamp 2 visible light simulation light source is used to assist the mechanical structure processing of the ultraviolet irradiation system and the installation and adjustment of the deuterium lamp 2.

[0046] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A large-area, high-irradiance ultraviolet irradiation device that simulates the positive electrical environment of the lunar sunward side, characterized in that: It comprises a large ultraviolet flange (4), a plurality of ultraviolet radiation sources, a plurality of position and posture holding fixtures (1) and a plurality of flange interfaces (3), wherein two large ultraviolet flanges (4) are located at the upper part of the straight cylinder section of the lunar dust chamber, and the angle between the interface axis and the axis of the lunar dust chamber cylinder is 45° and converges at the center of the focusing plane, and each large ultraviolet flange (4) is provided with a plurality of flange interfaces (3), and each ultraviolet radiation source is fixed on the flange interface (3) through the position and posture holding fixture (1), and the ultraviolet radiation source is a deuterium lamp (2); The position and posture holding fixture (1) is composed of a thin circular plate and four vertical double-headed studs, the upper ends of the double-headed studs are connected to the thin circular plate, and the lower ends are connected to the flange interface (3). The position and posture holding fixture (1) is installed from the rear of the deuterium lamp (2) to the flange interface (3), and the deuterium lamp (2) is fastened through a thin circular plate and bolt holes that match the flange interface (3), so that the deuterium lamp (2) and the flange interface (3) maintain a fixed relative position.

2. The large-area high-irradiance ultraviolet irradiation device for simulating the positive electrical environment of the lunar sunward side according to claim 1 is characterized in that: Each large ultraviolet flange (4) is provided with 37 flange interfaces (3).

3. The large-area high-irradiance ultraviolet irradiation device for simulating the positive electrical environment of the lunar sunward side according to claim 1 is characterized in that: 37 deuterium lamps (2) are arranged on each large ultraviolet flange (4) to form an irradiation surface with a diameter of Φ1000mm on the focusing plane of the lunar dust chamber. The distance between the Φ1000mm irradiation surface in the focusing plane and the reference ground of the lunar dust chamber container is 2400mm.

4. The large-area high-irradiance ultraviolet irradiation device for simulating the positive electrical environment of the lunar sunward side according to claim 3 is characterized in that: The maximum ultraviolet radiation intensity on the focusing plane is ≥3.5 vacuum ultraviolet constants. When 74 deuterium lamps are turned on at the same time, the irradiation surface with a diameter of 1000mm in the focusing plane of the lunar dust cabin can reach 4.15 vacuum ultraviolet constants.

5. The large-area high-irradiance ultraviolet irradiation device for simulating the positive electrical environment of the lunar sunward side according to claim 4 is characterized in that: 37 deuterium lamps (2) are arranged radially in a hexagonal pattern.

6. The large-area, high-irradiance ultraviolet irradiation device for simulating the positive electrical environment of the lunar sunward side according to claim 1, 2, 3, 4 or 5, characterized in that: The window of the deuterium lamp (2) is made of MgF2 material.

7. The large-area, high-irradiance ultraviolet irradiation device for simulating the positive electrical environment of the lunar sunward side according to claim 1, 2, 3, 4 or 5, characterized in that: The deuterium lamp (2) has a power of 150W and emits light from the top.

8. The large-area, high-irradiance ultraviolet irradiation device for simulating the positive electrical environment of the lunar sunward side according to claim 1, 2, 3, 4 or 5, characterized in that: A cooling fan is installed at the rear end of the deuterium lamp (2), and the cooling fan provides air cooling for the deuterium lamp (2), thereby ensuring that the deuterium lamp (2) is at a reliable operating temperature under normal temperature and pressure working conditions.

9. The large-area high-irradiance ultraviolet irradiation device for simulating the positive electrical environment of the lunar sunward side according to claim 8, characterized in that: The operating temperature of the deuterium lamp (2) is 10-40°C.

10. The large-area, high-irradiance ultraviolet irradiation device for simulating the positive electrical environment of the lunar sunward side according to claim 1, 2, 3, 4, 5 or 9, characterized in that: The spectrum of ultraviolet radiation from the deuterium lamp (2) is continuous radiation, and the spectrum wavelength range is 100 to 200 nm.

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