Method for carrying out artificial rainfall by adopting silver iodide nanoparticles and sowing device

Abstract

The invention relates to the field of artificial rainfall, in particular to a method for carrying out artificial rainfall by adopting silver iodide nanoparticles and a sowing device. The invention aims to overcome the problem of low nucleation efficiency caused by dependence of the traditional artificial rainfall technology on initiating explosive devices, low utilization rate of silver iodide and uncontrollable particle size. According to the main scheme, a pulse laser beam is generated through a laser generator; the energy density of the laser beam is adjusted to be 1-100 J / cm < 2 >, the pulse width is adjusted to be nanosecond to femtosecond level, the pulse repetition frequency is adjusted to be 10-100 kHz, and the laser beam is focused to act on the surface of the silver iodide target material; performing non-decomposable gasification on the silver iodide target material by utilizing the transient photothermal effect of the laser beam to generate silver iodide steam; condensing the silver iodide steam into silver iodide nano-particles of 10-1000nm in the air through high-altitude low-temperature high-speed airflow to form an artificial condensation nucleus; and releasing the silver iodide nanoparticles to the top or the interior of a target cloud layer to promote water vapor condensation and rainfall formation in the cloud.

Description

Technical Field

[0001] The invention relates to the field of artificial rainfall, and is a method and a spreading device for artificial rainfall using silver iodide nanoparticles. Background Art

[0002] Artificial weather modification technology (such as artificial rainfall, hail prevention, etc.) is an important means to deal with meteorological disasters and alleviate water shortages. Among them, silver iodide (AgI) is widely used in cold cloud catalysis operations due to its excellent ice nucleation performance. The current mainstream technology mainly releases silver iodide particles in the following two ways:

[0003] 1. Combustion type cigarette stick

[0004] Silver iodide powder is mixed with gunpowder and pressed into a columnar smoke rod, which is carried to the operation area by plane and ignited. The high temperature generated by the combustion of gunpowder causes the silver iodide to sublimate and vaporize, forming aerosol particles that diffuse into the cloud layer with the airflow. However, this method has significant defects:

[0005] Dependence on pyrotechnics: Cigarette sticks are civilian explosives. Their production, storage and transportation require approval, and the process is complex and time-consuming.

[0006] The proportion of effective ingredients is low: the silver iodide content in a single cigarette stick is only more than ten grams, and the remaining ingredients are gunpowder and adhesives, which limits the catalytic efficiency.

[0007] Poor particle uniformity: Temperature fluctuations during the combustion process result in a wide distribution of silver iodide particle sizes (hundreds of nanometers to tens of micrometers), which affects the efficiency of ice nucleation.

[0008] 2. Anti-aircraft guns / rocket bombs

[0009] Silver iodide is loaded into the warhead of the artillery shell and the catalyst is diffused through explosion. Although this method can quickly cover a large area, it has problems such as strict ammunition control, high operating costs (single launch costs more than 10,000 yuan) and safety risks.

[0010] In recent years, laser technology has been explored for meteorological intervention due to its precise and controllable characteristics. For example, femtosecond lasers can induce local condensation by ionizing the air, but this method relies on the inherent moisture in the cloud layer and cannot actively introduce condensation nuclei, so its scope of application is limited. Other studies have proposed using laser ablation of metal targets to generate aerosols, but their goal is air purification or material synthesis, and they do not involve the vaporization control of silver iodide and the adaptation of artificial rainfall scenarios.

[0011] Summary of existing technical bottlenecks:

[0012] The reliance on explosives complicates the approval of operations and makes it difficult to meet the needs of sudden meteorological intervention;

[0013] The effective utilization rate of silver iodide is low and the catalytic cost remains high;

[0014] The particle size distribution generated by the traditional combustion / explosion method is uncontrollable and the ice nucleation rate is unstable;

[0015] Emerging laser technologies have not yet been effectively combined with the silver iodide catalytic mechanism, and there is a lack of targeted solutions. Summary of the invention

[0016] Technical problems to be solved: Overcome the problems of traditional artificial rainfall technology's reliance on pyrotechnics, low utilization of silver iodide, and low nucleation efficiency caused by uncontrollable particle size, and provide a safe, efficient, and laser-catalyzed artificial rainfall method and device that can accurately generate nanoscale condensation nuclei.

[0017] The present invention provides a method for artificial rainfall using silver iodide nanoparticles, wherein a laser generator and a silver iodide target are mounted on an aircraft, and the method comprises the following steps:

[0018] (a) A pulsed laser beam generated by a laser generator;

[0019] (b) Adjust the energy density of the laser beam to 1–100 J / cm 2 , the pulse width is from nanosecond to femtosecond level, and the pulse repetition frequency is 10-100kHz, so that the laser beam is focused on the surface of the silver iodide target;

[0020] (c) utilizing the transient photothermal effect of the laser beam to cause non-decomposition gasification of the silver iodide target to generate silver iodide vapor;

[0021] (d) condensing the silver iodide vapor into silver iodide nanoparticles of 10-1000 nm in the air through a high-altitude low-temperature and high-speed airflow to form artificial condensation nuclei;

[0022] (e) releasing the silver iodide nanoparticles to the top or inside of a target cloud layer to promote condensation of water vapor in the cloud and formation of precipitation.

[0023] The present invention also provides a spreading device for implementing the method described in claim 1, comprising:

[0024] Laser generator module: output pulse energy 1–100 J / cm 2 Nanosecond laser beams;

[0025] Target chamber: It is equipped with target material and laser output module. The transient photothermal effect generated by the output laser beam of the laser output module is used to cause non-decomposition gasification on the surface of the silver iodide target material to generate silver iodide vapor. The cold air in the flight process is compressed and accelerated through the bell-mouth structure air inlet. The accelerated cold air will quickly cool and condense the silver iodide vapor to form silver iodide particles, which will be released into the target cloud layer through the bell-mouth structure air outlet.

[0026] In the above technical solution, the laser output by the laser generator module is introduced into the laser output module through the optical fiber, the laser is collimated inside the laser output module, and the laser spot is focused onto the target material through the adjustable reflector.

[0027] In the above technical solution, a target material gasification section is arranged between the target chamber bell-mouth structure air inlet and the bell-mouth structure air outlet, the bottom of the target material gasification section is used to set the target material, a protective window is arranged on the top of the target material gasification section, and a laser output module is arranged on the protective window.

[0028] In the above technical solution, a target material gasification section is arranged between the air inlet of the target chamber bell-mouth structure and the air outlet of the bell-mouth structure, a target material rotating device is arranged on the axis of the target material gasification section, and the target material is sleeved and fixed on the fixed cylinder of the target material rotating device.

[0029] In the above technical solution, a front rotating device installation structure is provided at the entrance of the target gasification section, including:

[0030] The threaded ring is fixed to the inner wall of the target material gasification section through a first fixed support, and the axis of the threaded ring coincides with the axis of the target material gasification section.

[0031] In the above technical solution, a rear rotating device installation structure is provided at the outlet of the target gasification section, including:

[0032] It comprises a bearing fixing ring, which is fixed to the inner wall of the target material gasification section through a second fixing support, a bearing is fixed in the bearing fixing ring, and the axis of the bearing coincides with the axis of the target material gasification section.

[0033] In the above technical solution, the target rotating device comprises:

[0034] The front-end motor mounting structure is provided with a threaded column along the direction of the output shaft of the motor. The threaded column is fixed with the threaded ring. The output shaft of the motor is led out from the center of the threaded column. The output shaft of the motor passes through the axis of the fixed cylinder and is inserted into the bearing hole.

[0035] In the above technical solution, the laser output module includes a guide rail parallel to the axis of the target gasification section, a moving platform is installed on the guide rail, the moving platform is driven by a driving motor to move along the guide rail, a focusing mirror and a second reflecting mirror are arranged on the moving platform, and also includes a collimating mirror, a first reflecting mirror, the collimating mirror collimates the light transmitted by the optical fiber and transmits it to the first reflecting mirror, the first reflecting mirror reflects the laser to the second reflecting mirror, and the second reflecting mirror reflects the laser to the focusing mirror, which focuses the laser and then passes through the protective window to hit the target.

[0036] In the above technical solution, the laser between the first reflector and the second reflector is parallel to the guide rail.

[0037] Because the present invention adopts the above technical means, it has the following beneficial effects:

[0038] 1. Precisely control the size of silver iodide particles: by adjusting the laser energy density (1–100 J / cm 2 ), pulse repetition frequency, and pulse width (nanosecond to femtosecond level), combined with the rapid condensation process of cold air, can stably generate silver iodide nanoparticles of 10-1000nm, whose size is highly matched with the nucleation requirements of supercooled water droplets in clouds, significantly improving the efficiency of ice nucleation.

[0039] 2. Avoid dependence on pyrotechnics: Using laser gasification to replace traditional gunpowder combustion or explosion spreading methods, there is no need to approve civil explosives, simplifying the operation process and reducing safety risks.

[0040] 3. Improve the utilization rate of silver iodide: Through the non-decomposition gasification process and the design of the target rotation device, the target material can be uniformly gasified to avoid ineffective loss. The amount of catalyst in a single operation is increased by more than 10 times compared with the combustion method.

[0041] 4. Dynamically adapt to complex airflow environments: The compression acceleration design of the bell-mouth structure air inlet (2) and the air outlet (7), combined with the high-speed movement of the aircraft, can enhance the mixing efficiency of silver iodide vapor and cold air, ensuring that the particles are evenly diffused into the cloud layer.

[0042] 5. Fixed-focus gasification to reduce costs: The coordinated control of the mobile platform (3-3) and the target rotating device enables the laser spot to dynamically scan the target surface, achieving fixed-focus gasification of silver iodide, greatly reducing the implementation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a simplified diagram of the process;

[0044] Figure 2 The figure is a schematic structural diagram of an embodiment.

[0045] Figure 3 for Figure 2 Left view of

[0046] Figure 4 The figure is a schematic structural diagram of an embodiment.

[0047] Figure 5 for Figure 4 The schematic diagram of the structure after the target rotating device is removed;

[0048] Figure 6 The corresponding left and right views;

[0049] Figure 7 for Figure 6 The middle right view shows the schematic diagram of the protection window in perspective;

[0050] Figure 8 This is a schematic diagram of the target rotating device after assembly and disassembly.

[0051] Description of reference numerals:

[0052] Optical fiber-1, bell-mouth structure air inlet-2, laser generator module-3, guide rail-3-1, drive motor-3-2, moving platform-3-3, second reflector-3-4, focusing mirror-3-5, first reflector-3-6, collimating mirror-3-7, target material vaporization section-4, protective window-4-1, target material vaporization section top-4-2, target material vaporization section bottom-4-3, target material-5, bell-mouth structure air outlet-7, threaded ring-9, first fixed support-8-1, bearing fixed ring-8-2, bearing-10, second fixed support-8-2, front end motor mounting structure-11, threaded column-11-1, motor output shaft-11-2, fixed cylinder-12, locking nut-12-1, positioning block-12-2, positioning groove-12-3, through hole-12-4. DETAILED DESCRIPTION

[0053] The following is a detailed description of the embodiments of the present invention. Although the present invention will be described and illustrated in conjunction with some specific embodiments, it should be noted that the present invention is not limited to these embodiments. On the contrary, modifications or equivalent substitutions made to the present invention should all be included in the scope of the claims of the present invention.

[0054] In addition, in order to better illustrate the present invention, numerous specific details are given in the following specific embodiments. It will be understood by those skilled in the art that the present invention can also be implemented without these specific details.

[0055] Example 1

[0056] The present invention provides a method for artificial rainfall using silver iodide nanoparticles, wherein a laser generator and a silver iodide target are mounted on an aircraft (preferably an unmanned aerial vehicle), and the method comprises the following steps:

[0057] (a) generating a pulsed laser beam with a wavelength of 532 nm to 2000 nm by a laser generator; the wavelength of the laser beam is 532 nm to 1064 nm, preferably 1550 nm.

[0058] (b) Adjust the energy density of the laser beam to 1–100 J / cm 2 , the pulse width is from nanosecond to femtosecond level, the pulse repetition frequency is 10-100kHz, and the laser beam is focused on the surface of the silver iodide target;

[0059] (c) utilizing the transient photothermal effect of the laser beam to cause non-decomposition gasification on the surface of the silver iodide target to generate silver iodide vapor;

[0060] (d) condensing the silver iodide vapor into silver iodide nanoparticles of 10-1000 nm in the air through a high-altitude air flow to form artificial condensation nuclei;

[0061] (e) releasing the silver iodide nanoparticles into a target cloud layer to promote condensation of water vapor in the cloud and formation of precipitation.

[0062] Example 2

[0063] The present invention also provides a spreading device, comprising:

[0064] Laser generator module: output wavelength 1064±50nm, pulse energy 1–100J / cm 2 Nanosecond lasers;

[0065] The target chamber is provided with a target material (5) and a laser output module (3). The transient photothermal effect generated by the laser beam output by the laser output module is used to cause the surface of the silver iodide target material (5) to undergo non-decomposition gasification to generate silver iodide vapor. The cold air in the flight process is compressed and accelerated through the bell-mouth structure air inlet (2). The accelerated cold air quickly cools and condenses the silver iodide vapor to form silver iodide particles. The silver iodide particles are then released into the target cloud layer through the bell-mouth structure air outlet (7).

[0066] In the above scheme, the laser output by the laser generator module is introduced into the laser output module (3) through the optical fiber (1), the laser is collimated inside the laser output module (3), and the laser spot is focused onto the target material (5) through the adjustable reflector. Specifically, the laser passes through the galvanometer and then focuses the laser spot onto the target material (5) through the field lens. The galvanometer actually has a motor inside to drive the reflector to move, thereby changing the position where the laser beam falls on the surface of the target material, and then zooming is performed through the field lens. The laser beam scans the surface of the target material, and the movement of the galvanometer is controlled by software to achieve beam deflection and scanning rate.

[0067] The present invention provides a target chamber structure, wherein a target material gasification section (4) is arranged between an air inlet (2) of a bell-mouth structure of the target chamber and an air outlet (7) of the bell-mouth structure, a target material (5) is arranged at the bottom (4-3) of the target material gasification section, and the target material can be fixed to the bottom (4-3) of the target material gasification section by gluing or the like, a protection window (4-1) is arranged at the top (4-2) of the target material gasification section, a laser output module (3) is arranged on the protection window (4-1), and the protection window (4-1) is generally made of fused quartz glass.

[0068] It is worth noting that Figure 2 , Figure 3The laser output module (3) shown mainly uses the existing mature technology galvanometer to adjust the lateral and vertical displacement of the laser output spot on the target material, and focuses the output laser through the field lens to ensure that the laser has a focus on the target material. The existing mature zoom technology is used here, so it will not be repeated.

[0069] In order to achieve the vaporization of silver iodide target under fixed focus conditions, the fixed focus mode equipment has low intelligent control requirements and lower implementation costs.

[0070] Example 3

[0071] The present invention also provides a spreading device, comprising:

[0072] Laser generator module: output wavelength 1064nm, pulse energy 1-100J / cm 2 Nanosecond lasers;

[0073] The target chamber is provided with a target material (5) and a laser output module (3). The transient photothermal effect of the output laser beam of the laser output module causes the surface of the silver iodide target material (5) to undergo non-decomposition gasification to generate silver iodide vapor. The cold air in the flight process is compressed and accelerated through the bell-mouth structure air inlet (2). The accelerated cold air quickly cools and condenses the silver iodide vapor to form silver iodide particles. The silver iodide particles are released into the target cloud layer through the bell-mouth structure air outlet (7).

[0074] As an example, see Figure 4 A target material gasification section (4) is arranged between the target chamber bell mouth structure air inlet (2) and the bell mouth structure air outlet (7), a target material rotating device is arranged on the axis of the target material gasification section, and the target material is sleeved and fixed on the target material fixing cylinder (12) of the target material rotating device.

[0075] As another embodiment, see Figure 4 The present invention provides a target chamber structure, wherein a front rotating device installation structure is arranged at the entrance of a target material gasification section (4), comprising a threaded ring (9), the threaded ring (9), the axis of the threaded ring (9) coincides with the axis of the target material gasification section (4), and the threaded ring (9) is fixed to the inner wall of the target material gasification section (4) via a first fixed support (8-1).

[0076] A rear rotating device installation structure is provided at the outlet of the target material gasification section (4), comprising a bearing (10), the axis of the bearing (10) coincides with the axis of the target material gasification section (4), and the outer ring of the bearing (10) is fixed to the inner wall of the target material gasification section (4) via a second fixed support (8-2);

[0077] The target material rotating device comprises a front end motor mounting structure (11), wherein the front end motor mounting structure (11) is provided with a threaded column (11-1) along the direction of the output shaft of the motor, the threaded column (11-1) is threadedly matched and fixed with a threaded ring (9), the center of the threaded column (11-1) leads out the output shaft (11-2) of the motor, and the output shaft of the motor passes through the axis of the target material fixing cylinder (12) and is inserted into the hole of the bearing (10).

[0078] As an example, see Figure 8 In order to facilitate the installation of the fixed cylinder (12) on the output shaft (11-2), a through hole (12-4) is provided on the target material fixed cylinder (12), and a positioning groove (12-3) is provided on the left end of the fixed cylinder (12). The positioning groove (12-3) cooperates with a positioning block (12-2) provided on the left end of the output shaft (11-2) to prevent the output shaft (11-2) and the target material fixed cylinder (12) from rotating. When in use, after the output shaft (11-2) passes through the through hole (12-4) on the target material fixed cylinder (12), it is pressed and fixed by a locking nut (12-1), and a corresponding thread (11-3) is provided on the output shaft (11-2) at the corresponding position.

[0079] As an assembly relationship embodiment, how to install the silver iodide target on the target rotating device is further described as follows to facilitate understanding by those skilled in the art:

[0080] 1. Insert the cylindrical silver iodide target into the target fixing cylinder (12) with a slight interference fit;

[0081] 2. Then align the central axis of the through hole of the target fixing cylinder (12) with the central axis of the threaded ring (9);

[0082] 3. Insert the motor output shaft (11-2) on the front motor mounting structure (11) through the threaded ring (9) into the through hole of the target material fixing cylinder (12), then rotate the front motor mounting structure (11) so that the threads of the threaded column (11-1) and the threaded ring (9) are locked, and finally the output shaft (11-2) is inserted into the bearing (10) to complete the fixing of the device.

[0083] As an example, see Figure 4 , Figure 5The laser output module (3) comprises a guide rail (3-1) parallel to the axis of the target gasification section (4), a movable platform (3-3) is installed on the guide rail, the movable platform (3-3) is driven by a driving motor (3-2) to move along the guide rail, a focusing mirror (3-5) and a second reflecting mirror (3-4) are arranged on the movable platform, and also comprises a collimating mirror (3-7), a first reflecting mirror (3-6), the collimating mirror collimates the light transmitted by the optical fiber and transmits it to the first reflecting mirror (3-6), the first reflecting mirror reflects the laser to the second reflecting mirror (3-4), the second reflecting mirror (3-4) reflects the laser to the focusing mirror (3-5), and after focusing, the laser passes through the protective window (4-1) and hits the target;

[0084] It is worth noting that the laser between the first reflector and the second reflector (3-4) needs to be arranged parallel to the guide rail (3-1), so as to ensure that the laser can still be reflected to the focusing mirror (3-5) after passing through the first reflector (3-6) and the second reflector (3-4) during the movement of the mobile platform (3-3).

[0085] As an embodiment, by setting the rotation speed of the motor output shaft to be fixed and then coordinating with the uniform speed movement of a certain platform, the fixed-focus vaporization of silver iodide can be achieved. The target material fixing cylinder (12) and the silver iodide target material of the cylindrical structure are used, and the target material can be fixed by a slight interference fit without the need for glue or other auxiliary fixing structures.

[0086] In summary, the present invention realizes the non-decomposition gasification of silver iodide target material through the laser transient photothermal effect, and combines the target chamber structure design with the optimization of airflow dynamics to break through the technical bottleneck of releasing silver iodide particles by the traditional combustion / explosion method. Specifically, the laser parameters (wavelength 1064, energy density 1-100J / cm 2 ) ensures that silver iodide only vaporizes on the surface rather than chemically decomposes. The generated vapor is quickly condensed by the high-speed cold air introduced by the bell-shaped air inlet (the compression acceleration effect increases the flow rate by 3-5 times), forming uniform nanoparticles of 100-1000nm. This particle size range is the best match for the size of supercooled water droplets in clouds (10-20μm), and a single silver iodide particle can provide multiple nucleation sites.

[0087] The innovative design of the device significantly improves the safety and economy of the operation: the rotating target structure (including the motor drive system and the bearing fixing assembly) forms a spiral scanning trajectory on the target surface through axial uniform rotation (the speed can be adjusted in the range of 5-30rpm), and the linear displacement of the mobile platform (guide rail accuracy ±0.1mm) maximizes the utilization rate of the target surface (up to 92%), and the effective release of silver iodide in a single operation is 2-5 times higher than that of the fixed target. In addition, the entire system does not require the participation of pyrotechnics, circumventing the approval process for civil explosives, and the operation response time is shortened from the traditional 72 hours to within 4 hours, which is particularly suitable for rapid intervention in sudden meteorological disasters.

[0088] Structural design innovation brings multiple technical advantages: the trumpet-shaped double-ended structure generates a negative pressure zone through the Venturi effect, which accelerates the mixing and condensation process of silver iodide vapor and cold air (residence time <50ms) and inhibits particle agglomeration; the combined design of the protective window (fused quartz glass) and the optical fiber transmission system allows the laser module to be away from the high-temperature vaporization area to avoid contamination of optical components; the positioning groove and locking nut structure of the target fixing cylinder enable rapid replacement of the target (operation time <2 minutes), significantly improving the maintainability of the device.

Claims

1. A method for artificial rainfall using silver iodide nanoparticles, characterized in that: The laser generator and the silver iodide target are mounted on the aircraft, including the following steps: (a) A pulsed laser beam generated by a laser generator; (b) Adjust the energy density of the laser beam to 1-100 J / cm 2 , the pulse width is from nanosecond to femtosecond level, and the pulse repetition frequency is 10-100kHz, so that the laser beam is focused on the surface of the silver iodide target; (c) utilizing the transient photothermal effect of the laser beam to cause non-decomposition gasification of the silver iodide target to generate silver iodide vapor; (d) condensing the silver iodide vapor into silver iodide nanoparticles of 10-1000 nm in the air through a high-altitude low-temperature and high-speed airflow to form artificial condensation nuclei; (e) releasing the silver iodide nanoparticles to the top or inside of a target cloud layer to promote condensation of water vapor in the cloud and formation of precipitation.

2. A spreading device for implementing the method of claim 1, characterized in that: include: Laser generator module: output pulse energy 1-100J / cm 2 Nanosecond laser beams; The target chamber is provided with a target material (5) and a laser output module (3). The transient photothermal effect generated by the laser beam output by the laser output module is used to cause the surface of the silver iodide target material (5) to undergo non-decomposition gasification to generate silver iodide vapor. The cold air in the flight process is compressed and accelerated through the bell-mouth structure air inlet (2). The accelerated cold air quickly cools and condenses the silver iodide vapor to form silver iodide particles. The silver iodide particles are then released into the target cloud layer through the bell-mouth structure air outlet (7).

3. The spreading device according to claim 2, characterized in that The laser output by the laser generator module is introduced into the laser output module (3) through the optical fiber (1), the laser is collimated inside the laser output module (3), and the laser spot is focused onto the target material (5) through an adjustable reflector.

4. The spreading device according to claim 2, characterized in that A target material gasification section (4) is arranged between the target chamber bell mouth structure air inlet (2) and the bell mouth structure air outlet (7); the bottom (4-3) of the target material gasification section is used to arrange the target material (5); a protection window (4-1) is arranged at the top (4-2) of the target material gasification section; and a laser output module (3) is arranged on the protection window (4-1).

5. The spreading device according to claim 2, characterized in that: A target material gasification section (4) is arranged between the target chamber bell mouth structure air inlet (2) and the bell mouth structure air outlet (7), a target material rotating device is arranged on the axis of the target material gasification section, and the target material is sleeved and fixed on a fixed cylinder (12) of the target material rotating device.

6. The spreading device according to claim 5, characterized in that A front rotating device installation structure is provided at the entrance of the target material gasification section (4), comprising: The threaded ring (9) is fixed to the inner wall of the target material gasification section (4) via a first fixed support (8-1), and the axis of the threaded ring (9) coincides with the axis of the target material gasification section (4).

7. The spreading device according to claim 5, characterized in that A rear rotating device installation structure is provided at the outlet of the target material gasification section (4), comprising: It comprises a bearing fixing ring (8-2) fixed to the inner wall of the target material gasification section (4) via a second fixing support (8-2); a bearing (10) is fixed inside the bearing fixing ring (8-2); and the axis of the bearing (10) coincides with the axis of the target material gasification section (4).

8. The spreading device according to claim 7, characterized in that The target rotating device includes: The front end motor mounting structure (11) is provided with a threaded column (11-1) along the direction of the output shaft of the motor. The threaded column (11-1) is threadedly matched and fixed with the threaded ring (9). The center of the threaded column (11-1) leads out the output shaft of the motor. The output shaft of the motor passes through the axis of the fixed cylinder (12) and is then inserted into the hole of the bearing (10).

9. The spreading device according to claim 5, characterized in that The laser output module (3) comprises a guide rail (3-1) parallel to the axis of the target material gasification section (4), a movable platform (3-3) being installed on the guide rail, the movable platform (3-3) being driven by a driving motor (3-2) to move along the guide rail, a focusing mirror (3-5) and a second reflecting mirror (3-4) being arranged on the movable platform, and further comprising a collimating mirror (3-7) and a first reflecting mirror (3-6), the collimating mirror collimating the light transmitted by the optical fiber and transmitting the light to the first reflecting mirror (3-6), the first reflecting mirror reflecting the laser to the second reflecting mirror (3-4), the second reflecting mirror (3-4) reflecting the laser to the focusing mirror (3-5), the laser is focused and then passes through a protective window (4-1) and then hits the target material.

10. The spreading device according to claim 9, characterized in that The laser light between the first reflecting mirror and the second reflecting mirror (3-4) is parallel to the guide rail (3-1).

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