Laser projection observation device

Abstract

The invention provides a laser projection observation device, and relates to the technical field of suspended particle projection. A laser beam emitted by a laser device is combined with a particle suspension technology realized by a suspension device, and an amplification module is introduced to amplify particle scattered light to form a dynamic real-time image on a projection curtain, so that the problem that in the prior art, no lossless and non-contact in-situ real-time observation on suspended particles is available is solved; the objective of providing a clear, large-size and real-time dynamic observation effect is achieved.

Description

Technical Field

[0001] This application relates to the field of suspended particle projection technology, and more specifically, to a laser projection observation device. Background Technology

[0002] The study of the physicochemical properties of particles is an important interdisciplinary field. Particle properties are influenced by various factors such as size, density, morphology, and surface charge. When interacting with environmental media in complex environments, particles are prone to deformation or contamination, making non-interference in-situ observation difficult. Particle levitation technology can effectively overcome the problems of particle aggregation caused by gravitational sedimentation and van der Waals forces. Currently, there are various levitation techniques, including ultrasonic levitation, optical levitation, electrostatic levitation, pneumatic levitation, and superconducting levitation. Among them, ultrasonic levitation technology uses acoustic radiation to counteract gravity, allowing particles to remain stably suspended at standing wave nodes, thus avoiding interference from physical contact and providing strong support for in-situ observation of the dynamic and static behavior of particles. However, in actual observation, current technologies typically use LED light sources to illuminate the suspended object, and then an observation camera takes images. This camera-based observation cannot achieve non-destructive, non-contact real-time observation. Although suspension technology can achieve non-contact suspension of particles, there is still a lack of effective technical means for non-destructive and non-contact in-situ real-time observation of suspended particles (or droplets), making it difficult to obtain clear, real-time and undisturbed magnified dynamic images.

[0003] There is currently no effective technical solution to the above problems. Summary of the Invention

[0004] The purpose of this application is to provide a laser projection observation device that can realize non-destructive, non-contact in-situ real-time observation of suspended particles and obtain clear, real-time and undisturbed magnified dynamic images.

[0005] This application provides a laser projection observation device, which includes a laser, a levitation device, an amplification module and a projection screen arranged from front to back; The suspension device is used to suspend suspended particles; The laser is used to emit a laser beam, which illuminates the suspended particles to form scattered light. The scattered light is amplified by the amplification module and forms a magnified dynamic real-time image of the suspended particles on the projection screen.

[0006] The above method enables non-destructive, non-contact, in-situ real-time observation of suspended particles, and obtains clear, real-time, and undisturbed magnified dynamic images.

[0007] Optionally, it also includes a three-dimensional worktable; The three-dimensional worktable is used to place the laser, and the three-dimensional worktable is used to adjust the incident direction and angle of the laser beam according to the position of the suspended particles.

[0008] The above method allows for flexible adjustment of the incident direction and angle of the laser beam based on the position of the suspended particles, improving the flexibility and accuracy of observation.

[0009] Optionally, the amplification module includes at least two convex lenses, each of which is spaced apart along the direction of the laser beam illumination, and the convex lenses are used to amplify the scattered light.

[0010] The above method can effectively amplify the scattered light, ensuring a clear magnified image.

[0011] Optionally, the magnification module includes two convex lenses, the first convex lens being 1.5 times the focal length of the first convex lens and the suspended particle being positioned 4.5 times the focal length behind the first convex lens.

[0012] Optionally, the suspended particles include polyurethane foam balls, droplets, or metal particles.

[0013] Optionally, the levitation device includes a first ultrasonic emitting device and a reflection module. The first ultrasonic emitting device and the reflection module are arranged vertically opposite each other, and a resonant cavity is formed between the first ultrasonic emitting device and the reflection module. The first ultrasonic emitting device provides ultrasonic waves, and the ultrasonic waves form a standing wave field in the resonant cavity to levitate the suspended particles.

[0014] Optionally, the vertical height of the resonant cavity ranges from 1cm to 90cm.

[0015] Optionally, the reflective surface of the reflective module can be any one of a planar surface, a concave surface, or an irregular surface.

[0016] Optionally, the levitation device includes two second ultrasonic emitting devices arranged opposite each other to form a resonant cavity. The second ultrasonic emitting devices provide ultrasonic waves, which form a standing wave field in the resonant cavity and are used to levitate the suspended particles.

[0017] Optionally, the projection screen is a metal screen or a white plastic screen.

[0018] As can be seen from the above, the laser projection observation device provided in this application combines the laser beam emitted by the laser with the particle suspension technology achieved by the suspension device, and introduces an amplification module to amplify the scattered light of the particles and form a dynamic real-time image on the projection screen. This solves the problem of the lack of non-destructive, non-contact in-situ real-time observation of suspended particles in the prior art, and achieves the purpose of providing clear, large-size, real-time dynamic observation effect.

[0019] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a first structure of a laser projection observation device provided in an embodiment of this application.

[0021] Figure 2 A schematic diagram illustrating the effect of suspending nickel-based alloy microparticles in a first type of suspension device, as provided in the embodiments of this application.

[0022] Figure 3 This is a schematic diagram of a second structure of the laser projection observation device provided in the embodiments of this application.

[0023] Figure 4 This is a schematic diagram illustrating the effect of suspending polyurethane microspheres provided in the second type of suspension device according to an embodiment of this application.

[0024] Labeling explanations: 1. Laser; 2. Three-dimensional worktable; 3. First type of ultrasonic emitting device; 4. Reflection module; 5. Second type of ultrasonic emitting device; 6. Convex lens; 7. Projection screen. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Please refer to Figures 1-4 This application provides a laser projection observation device that enables non-destructive, non-contact, in-situ real-time observation of suspended particles and acquires clear, real-time, and undisturbed magnified dynamic images.

[0028] This application provides a laser projection observation device, which includes a laser 1, a levitation device, an amplification module and a projection screen 7 arranged from front to back; Suspension devices are used to suspend suspended particles; Laser 1 is used to emit a laser beam. The laser beam irradiates the suspended particles to form scattered light. The scattered light is amplified by the amplification module and forms a magnified dynamic real-time image of the suspended particles on the projection screen 7.

[0029] Among them, the levitation device refers to a device that can overcome gravity or other interference forces and make the particles stay stably in a specific spatial area; the amplification module refers to a component that can optically amplify light signals to form larger images; and the projection screen 7 refers to a surface used to receive and display projected images.

[0030] Specifically, the device operates as follows: First, the levitation device stably suspends the particles in a predetermined spatial area, ensuring that the particles are in a non-contact, undisturbed, in-situ state. Next, a laser beam emitted by laser 1 precisely illuminates these suspended particles, causing them to scatter light. This scattered light then enters an amplification module, which optically processes and amplifies it. Finally, the amplified scattered light is projected onto a projection screen 7, forming a magnified, dynamic, real-time image of the particles. This entire process constructs a complete optical observation path, enabling the real-time, large-scale presentation of the particles' minute dynamic behaviors and morphological changes, thus achieving non-destructive, non-contact, and in-situ real-time observation of the particles.

[0031] The laser beam emitted by laser 1 can be red or blue light, etc., without specific restrictions.

[0032] In some implementations, a three-dimensional worktable 2 is also included; The three-dimensional worktable 2 is used to place the laser 1, and the three-dimensional worktable 2 is used to adjust the incident direction and angle of the laser beam according to the position of the suspended particles.

[0033] Among them, the three-dimensional worktable 2 refers to a support platform that can realize precise multi-axial displacement and / or angle adjustment. It can be composed of multiple mutually perpendicular linear movement mechanisms and / or rotation mechanisms, such as ball screws, rack and pinion gears or linear motor systems driven by stepper motors or servo motors.

[0034] Specifically, this application introduces a three-dimensional stage 2, enabling the laser projection observation device to adapt to the dynamic changes of suspended particles, thereby ensuring the observation effect. When the position of the suspended particles changes within the suspension device, the three-dimensional stage 2 can precisely adjust the spatial position and orientation of the laser 1 placed on it based on the real-time position information of the particles, thereby changing the incident direction and angle of the laser beam. For example, if the suspended particles move upward, the three-dimensional stage 2 can move the laser 1 upward; if the suspended particles move to the left, the three-dimensional stage 2 can move the laser 1 to the left, while simultaneously adjusting the pitch or yaw angle of the laser 1 to maintain the ideal relative position between the beam and the suspended particles. This dynamic adjustment mechanism ensures that the laser beam can continuously and accurately illuminate the suspended particles, even when the suspended particles are in a non-fixed or moving state, high-quality scattered light can be obtained. It is precisely because the laser beam can always be precisely aligned with the suspended particles that the scattered light can be stably and fully formed, and after being amplified by the amplification module, a clear and complete magnified dynamic real-time image of the suspended particles is formed on the projection screen 7. This collaborative working method greatly enhances the ability to conduct non-destructive, non-contact in-situ real-time observation of dynamic suspended particles, overcoming the limitation that a fixed laser 1 cannot effectively observe dynamic particles.

[0035] In some embodiments, the amplification module includes at least two convex lenses 6, which are spaced apart along the direction of laser beam illumination, and the convex lenses 6 are used to amplify the scattered light.

[0036] Specifically, the core optical element of the magnification module is a convex lens 6, and at least two are used. This design provides a concrete and flexible basis for achieving optical magnification. Compared to a single convex lens 6, using a combination of at least two convex lenses 6 can provide a greater magnification while better correcting optical aberrations, such as spherical aberration and chromatic aberration, resulting in a clearer and more stable magnified image that meets the requirements for observing particle details. Furthermore, the individual convex lenses 6 are connected in series in the path of scattered light propagation, maintaining a certain spacing. This spacing is key to achieving multi-stage optical magnification and optimizing image quality. By adjusting the distance between the convex lenses 6, the total focal length and magnification of the entire optical system can be flexibly changed, while also helping to further correct various optical aberrations, ensuring that the scattered light emitted from the suspended particles can be effectively converged and magnified, forming a high-fidelity dynamic real-time image on the projection screen 7.

[0037] In some embodiments, the magnification module includes two convex lenses 6, the first convex lens 6 being 1.5 times the focal length of the suspended particle, and the second convex lens 6 being positioned 4.5 times the focal length behind the first convex lens 6.

[0038] Specifically, such as Figure 1 As shown, the distance between the first convex lens 6 and the suspended particle is set to 1.5 times the focal length of the first convex lens 6. This ensures that the particles scattered by the suspended particle after being irradiated by the laser 1 are precisely located between the focal length F and twice the focal length 2F of the first convex lens 6. According to the principle of optical imaging, when the suspended particle is in this position, the first convex lens 6 will form an inverted, magnified, and real intermediate image, and the image distance of this intermediate image will be greater than twice the focal length. This initial magnification lays a clear image foundation for subsequent further magnification, ensuring that the detailed information of the tiny suspended particles is effectively captured. Based on this, the second convex lens 6 is set 4.5 times the focal length behind the first convex lens 6, enabling the second convex lens 6 to effectively receive and process the intermediate image formed by the first convex lens 6, further magnify the intermediate image, and project it clearly onto the projection screen 7. This combined optical design allows the laser beam emitted by laser 1 to illuminate the scattered light generated by suspended particles. After being precisely amplified twice by the amplification module, the light is ultimately projected onto the projection screen 7 as a dynamic, real-time image of the suspended particles with sufficient magnification and clarity. This precise distance configuration enables the entire laser projection observation device to achieve non-destructive, non-contact, in-situ real-time observation of suspended particles, thus meeting the high requirements for image clarity and accuracy in the study of the physicochemical properties of particles.

[0039] In some embodiments, the suspended particles include polyurethane foam balls, droplets (with a density ranging from 0.02 g / cm³ to 11.3 g / cm³ and a diameter less than or equal to 2 mm), or metal particles.

[0040] Specifically, when the suspended particles are polyurethane foam spheres, their lightweight and porous structure allows them to easily and stably suspend in an acoustic field and effectively scatter laser beams, generating sufficiently strong scattered light signals. These scattered light signals are amplified by the amplification module to form a clear, magnified, dynamic, real-time image on the projection screen 7. The material properties of the polyurethane foam spheres also ensure that they are not easily deformed or damaged under laser beam irradiation, thus enabling non-destructive observation. When the suspended particles are droplets, such as water or oil droplets, they are typically spherical and can generate regular and efficient light scattering, which is crucial for forming a clear, high-contrast projected image. The fluid properties of droplets also allow for the observation of their dynamic behavior, and at appropriate laser power, droplets can remain stable, avoiding interference from physical contact, making them ideal for non-destructive, non-contact, in-situ real-time observation. Furthermore, when the suspended particles are metal particles, their high reflectivity and strong scattering ability expand the observation range of the device, enabling the observation of metallic materials or particles with conductive properties. When a suitable laser wavelength and power are selected, metal particles can also provide sufficient scattered light signals to form a clear projected image. By defining these specific types of suspended particles, this scheme ensures that the observed particles can work in conjunction with the laser 1, the suspension device, and the amplification module to effectively generate scattered light and form clear, magnified, dynamic, real-time images, thereby overcoming the shortcomings of existing technologies that lack non-destructive, non-contact, in-situ real-time observation of specific suspended particles.

[0041] In one specific embodiment, the laser projection observation device can be used to observe tiny droplets suspended in the air. First, one or more water droplets are stably suspended in the path of a laser beam using a suspending device. Laser 1 emits a collimated laser beam, precisely illuminating these suspended water droplets. The water droplets, acting as scatterers, scatter the incident laser beam in various directions. This scattered light then enters an amplification module, which can consist of a series of optical lenses for optically amplifying the scattered light. The amplified scattered light is finally projected onto a projection screen 7, forming a magnified, dynamic, real-time image of the water droplets. By observing the image on the projection screen 7, the shape of the water droplets, vibrations caused by surface tension, and even internal Brownian motion can be clearly seen. For example, the size changes of the water droplets during evaporation or the flow patterns inside the droplets when different liquids are mixed can be observed. In another embodiment, polyurethane foam spheres can be observed. Tiny polyurethane foam spheres are stabilized in the laser path using a suspending device. After being irradiated by the laser beam, their porous structure produces specific scattering patterns. These patterns, after magnification and projection, can be used to analyze the structural integrity of the foam spheres or their deformation under external disturbances. These implementation methods can all effectively utilize the characteristics of laser projection observation devices to achieve non-destructive and non-contact observation of specific types of particles.

[0042] In some embodiments, the levitation device includes a first ultrasonic transmitting device 3 and a reflecting module 4, the first ultrasonic transmitting device 3 and the reflecting module 4 being arranged vertically opposite each other, a resonant cavity being formed between the first ultrasonic transmitting device 3 and the reflecting module 4, the first ultrasonic transmitting device 3 providing ultrasonic waves, the ultrasonic waves forming a standing wave field in the resonant cavity and being used to levitate the suspended particles.

[0043] The first ultrasonic transmitting device 3 and the second ultrasonic transmitting device 5 are both devices capable of generating ultrasonic energy. For example, the first ultrasonic transmitting device 3 and the second ultrasonic transmitting device 5 can be the same type of device, specifically using a piezoelectric transducer, a magnetostrictive transducer or an electrostatic transducer.

[0044] Among them, the standing wave field refers to the sound field with fixed nodes and antinodes formed by the superposition of ultrasonic waves in a specific space, which can be used to apply acoustic radiation force to particles.

[0045] Specifically, such as Figure 1 As shown, the core of the levitation device lies in its ultrasonic levitation mechanism. A first ultrasonic emitting device 3 is configured to be positioned vertically opposite a reflecting module 4, defining a specific space between them, namely a resonant cavity. When the first ultrasonic emitting device 3 is activated and provides ultrasonic waves, these ultrasonic waves propagate within the resonant cavity. Due to the boundary conditions of the resonant cavity, the ultrasonic waves reflect back and forth within it and superimpose themselves, thus forming a stable standing wave field. Within this standing wave field, there are fixed positions for sound pressure nodes and antinodes. When suspended particles are introduced into this standing wave field, they are subjected to acoustic radiation forces. This force pushes the particles to specific positions within the standing wave field, typically sound pressure nodes, thereby enabling the particles to achieve stable, contactless levitation in the air. This levitation method avoids any physical contact, thus eliminating the problems of contamination, deformation, or positional instability that may arise from traditional mechanical supports or airflow disturbances. In this way, the particles can be precisely fixed in the path of the laser beam emitted by the laser 1, ensuring that the laser beam stably illuminates the particles, forming clear scattered light. The scattered light then stably enters the amplification module for amplification, forming a magnified dynamic real-time image of the particles on the projection screen 7. For example, when the power of the first ultrasonic transmitting device 3 is 2kW and the ultrasonic frequency is 20kHz, and the projection screen 7 is a white plastic screen (suitable for use in low-light environments), the nickel-based alloy particles are suspended in the levitation device. The laser 1 emits blue light to irradiate the nickel-based alloy particles, forming a magnified dynamic real-time image of the nickel-based alloy particles on the projection screen 7. The effect is illustrated in the diagram below. Figure 2As shown. This precise suspension control is key to achieving non-destructive, non-contact in-situ real-time observation. It enables the entire laser projection observation device to continuously and clearly capture the dynamic behavior of particles, thereby solving the problems of particle susceptibility to interference and difficulty in in-situ real-time observation during the observation process.

[0046] In some implementations, the vertical height of the resonant cavity ranges from 1 cm to 90 cm.

[0047] Specifically, the first ultrasonic transmitter 3 and the reflecting module 4 in the levitation device are arranged vertically opposite each other, forming a resonant cavity between them. The ultrasonic waves emitted by the first ultrasonic transmitter 3 propagate within this resonant cavity and superimpose with the ultrasonic waves reflected by the reflecting module 4, thereby forming a stable standing wave field. The standing wave field has a series of fixed nodes and antinodes. Under the action of acoustic radiation force, particles are pushed towards the nodes of the standing wave field and stably levitate there. It is precisely because the vertical height of the resonant cavity is limited to the range of 1cm to 90cm that a stable and moderately strong standing wave field can be formed within the resonant cavity. If the height is too small, the ultrasonic waves may not be able to form a complete standing wave pattern, or the standing wave nodes may be too dense, which is not conducive to the effective capture and stabilization of particles; if the height is too large, the energy attenuation of the ultrasonic waves during propagation will be aggravated, resulting in insufficient standing wave field strength to effectively counteract the gravity of the particles, thus affecting the levitation effect and increasing the size of the device. Therefore, this limitation ensures that a stable and moderately strong standing wave field can be formed within the resonant cavity, allowing particles of different sizes or types to be effectively and stably levitated at predetermined positions. This provides a stable target for subsequent laser beam illumination and magnified observation, thereby ensuring the clarity and stability of the dynamic real-time image of the magnified particles on the projection screen 7, improving the reliability of the observation, and enabling the entire observation process to achieve non-destructive and non-contact in-situ real-time observation, overcoming the problems of unclear or unstable observation in existing technologies.

[0048] In some implementations, the reflective surface of the reflective module 4 is any one of a planar surface, a concave surface, or an irregular surface.

[0049] Among them, the reflection module 4 refers to the component in the suspension device that is set opposite to the ultrasonic transmitting device and is used to reflect ultrasonic waves to form a standing wave field in the resonant cavity.

[0050] Specifically, when the first ultrasonic transmitting device 3 emits ultrasonic waves, these ultrasonic waves propagate within the resonant cavity and impact the reflecting module 4. The specific shape of the reflecting module 4 determines the reflection path and interference mode of the ultrasonic waves. When the reflecting module 4 is planar, the ultrasonic waves are uniformly reflected, resulting in a uniformly distributed standing wave field within the resonant cavity. This uniform standing wave field can provide stable suspension points for particles or multiple particles over a large area, ensuring the consistency and stability of suspension. When the reflecting module 4 is concave, its unique geometry can focus the incident ultrasonic waves to a specific area of ​​the resonant cavity. This focusing effect results in a stronger and more concentrated standing wave field in that area, enabling precise levitation of smaller, lighter particles, improving the accuracy and reliability of suspension. When the reflecting module 4 is an irregular surface, its design flexibility is fully realized. By carefully designing the undulations and curvature of the irregular surface, non-uniform or multi-point standing wave field distributions can be created according to the specific physical properties of the particles or complex suspension requirements. This allows the device to adapt to particles of special shapes, or to simultaneously form multiple independent suspension regions within the same resonant cavity, greatly expanding the functionality and application range of the suspension device. It is through this method—selecting or designing a specific shape of the reflective module 4 according to actual suspension requirements—that the suspension device of this application can generate a more adaptable and effective standing wave field, thereby ensuring that particles of different types, sizes, and quantities are stably and accurately suspended under non-contact and non-destructive conditions, providing reliable and multifunctional support for subsequent magnified dynamic real-time image observation.

[0051] In some embodiments, the levitation device includes two second ultrasonic transmitters 5 arranged opposite each other to form a resonant cavity. The second ultrasonic transmitters 5 provide ultrasonic waves, which form a standing wave field in the resonant cavity and are used to levitate the suspended particles.

[0052] Specifically, such as Figure 3As shown, two second-type ultrasonic transmitting devices 5 each provide ultrasonic waves, which superimpose and interfere with each other inside the resonant cavity to form a stable standing wave field. Compared with the scheme relying on a single transmitting device and a passive reflection module 4, using two active transmitting devices allows for more direct control over the generation and propagation of ultrasonic waves. For example, by adjusting the phase, frequency, or amplitude of the two transmitting devices, the characteristics of the standing wave field within the resonant cavity can be finely adjusted. This configuration avoids dependence on the characteristics of the reflection module 4, thereby improving the stability of the resonant cavity and the efficiency of standing wave field formation. Within the formed standing wave field, there are sound pressure nodes that generate acoustic radiation forces. These forces effectively counteract the gravity of the suspended particles, thus achieving contactless and lossless levitation of the particles. In this way, this scheme provides a more uniform and stable standing wave field, thereby improving the stability and controllability of the suspended particles. This improved levitation stability provides a more reliable source of suspended particles for the laser projection observation device, enabling the laser beam to stably irradiate the suspended particles, forming clear scattered light. Ultimately, this results in a magnified, dynamic, real-time image of the suspended particles displayed on the projection screen 7. For example, when the power of the second ultrasonic transmitter 5 is 100mW and the ultrasonic frequency is 40kHz, and the projection screen 7 is a metal screen, the polyurethane microspheres are suspended within this levitation device. The laser 1 emits red light to irradiate the polyurethane microspheres, forming a magnified, dynamic, real-time image of the polyurethane microspheres on the projection screen 7. A schematic diagram of this effect is shown below. Figure 4 As shown, this improves the performance and observation results of the entire observation system.

[0053] In some implementations, the projection screen 7 is a metal screen or a white plastic screen.

[0054] Specifically, the laser projection observation device of this application emits a laser beam from a laser 1, which illuminates suspended particles in a suspension device, thereby generating scattered light. This scattered light carries the dynamic information of the particles, which is then received by the amplification module and optically magnified, ultimately forming a magnified dynamic real-time image of the particles on the projection screen 7. Furthermore, when the projection screen 7 is made of metal, its high reflectivity and excellent light focusing performance allow for more effective reflection of the scattered light generated after the laser beam illuminates the particles. This high reflectivity ensures that the particle image formed on the projection screen 7 has higher brightness and contrast, allowing for the observation of detailed particle features. Compared to screens made of other materials, metal screens significantly reduce light scattering and energy loss, resulting in sharper images and avoiding problems of unclear or low-brightness images. Therefore, by setting the projection screen 7 to a metal screen, the entire observation device can accurately and meticulously capture and analyze the dynamic behavior and physicochemical properties of particles, thereby achieving non-destructive, non-contact, in-situ real-time observation capabilities of suspended particles. If a white plastic screen is used, it can provide a uniform and clear image even in dimly lit environments, meeting the needs of specific observation conditions.

[0055] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0056] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A laser projection observation device, characterized in that, It includes a laser (1), a levitation device, an amplification module and a projection screen (7) arranged from front to back. The suspension device is used to suspend suspended particles; The laser (1) is used to emit a laser beam, which irradiates the suspended particles to form scattered light. The scattered light is amplified by the amplification module and forms an amplified dynamic real-time image of the suspended particles on the projection screen (7).

2. The laser projection observation device according to claim 1, characterized in that, It also includes a three-dimensional worktable (2); The three-dimensional worktable (2) is used to place the laser (1), and the three-dimensional worktable (2) is used to adjust the incident direction and angle of the laser beam according to the position of the suspended particles.

3. The laser projection observation device according to claim 1, characterized in that, The amplification module includes at least two convex lenses (6), each of which is spaced apart along the direction of the laser beam illumination, and the convex lenses (6) are used to amplify the scattered light.

4. The laser projection observation device according to claim 3, characterized in that, The magnification module includes two convex lenses (6). The distance between the first convex lens (6) and the suspended particle is 1.5 times the focal length of the first convex lens (6). The second convex lens (6) is located 4.5 times the focal length behind the first convex lens (6).

5. The laser projection observation device according to claim 1, characterized in that, The suspended particles include polyurethane foam balls, droplets, or metal particles.

6. The laser projection observation device according to claim 1, characterized in that, The levitation device includes a first ultrasonic transmitter (3) and a reflection module (4). The first ultrasonic transmitter (3) and the reflection module (4) are arranged vertically opposite each other. A resonant cavity is formed between the first ultrasonic transmitter (3) and the reflection module (4). The first ultrasonic transmitter (3) provides ultrasonic waves, which form a standing wave field in the resonant cavity and are used to levitate the suspended particles.

7. The laser projection observation device according to claim 6, characterized in that, The vertical height of the resonant cavity ranges from 1cm to 90cm.

8. The laser projection observation device according to claim 6, characterized in that, The reflective surface shape of the reflective module (4) can be any one of a plane, a concave surface, or an irregular surface.

9. The laser projection observation device according to claim 1, characterized in that, The levitation device includes two second ultrasonic transmitters (5), which are arranged opposite each other to form a resonant cavity. The second ultrasonic transmitters (5) provide ultrasonic waves, which form a standing wave field in the resonant cavity and are used to levitate the suspended particles.

10. The laser projection observation device according to claim 1, characterized in that, The projection screen (7) is a metal screen or a white plastic screen.

Images