Device and method for measuring dynamic adsorption force on particles

Abstract

This application discloses a device for measuring the dynamic adsorption force on particles, belonging to the technical fields of particle mechanics and experimental fluid mechanics. The application includes: a base cylinder, a rectifying device, a centering guide device, a negative pressure fan, and a camera. By using camera imaging and target trajectory tracking technology, this application can record and analyze the motion trajectory and velocity of particles during the adsorption process in real time. Simultaneously, by calculating the resultant force on the particles at various moments, the dynamic adsorption force on the particles is obtained, and the microscopic details of the particle adsorption process can be captured. This application features high precision, non-destructive operation, and ease of operation, which can help to deeply understand and control the particle adsorption process and promote the application of adsorption processes in various fields.

Description

Technical Field

[0001] This application belongs to the technical field of particle mechanics and experimental fluid mechanics, and more specifically relates to a device and method for measuring the dynamic adsorption force on particles. Background Technology

[0002] Adsorption flow refers to the flow behavior of substances within an adsorption medium during the adsorption process. When a substance comes into contact with the adsorption medium, adsorption occurs, meaning that substance molecules or particles adhere to the surface of the adsorption medium. Adsorption flow is an important mass transport phenomenon present in many agricultural, industrial, and biological applications, such as seed and impurity adsorption, catalytic reactions, and the separation of biological particles.

[0003] Understanding the properties of adsorption flow and adsorption forces is crucial for optimizing the control and design of adsorption processes. During adsorption, adsorption force is the primary force supporting particle retention on the pores, and its magnitude and nature directly affect adsorption time and transport efficiency. Therefore, accurate measurement of adsorption force is essential for understanding and controlling the adsorption process, especially the measurement of dynamic adsorption force. Measuring dynamic adsorption force provides information on changes and dynamic behavior of adsorption force during adsorption, which is invaluable for understanding particle movement, adsorption rate, and adsorption equilibrium in the adsorption medium. Furthermore, by measuring dynamic adsorption force, the conditions and parameters of the adsorption process can be optimized to improve adsorption efficiency and effectiveness, which has wide applications in agricultural engineering, chemical engineering, and bioengineering.

[0004] Existing adsorption force measurement devices and methods have the following problems: some devices and methods are limited by the complexity of experimental conditions, resulting in insufficient measurement accuracy, and may also damage the particles being measured; some devices and methods can only provide the macroscopic average value of adsorption force, and cannot measure the adsorption force of particles at any time, making it difficult to reveal the microscopic details of the adsorption process; some devices and methods can only measure the static adsorption force of particles at the adsorption pore, making it difficult to accurately describe the actual dynamic adsorption force experienced by particles during the adsorption process. Summary of the Invention

[0005] To overcome the problems existing in the prior art, this patent application provides a device and method for measuring the dynamic adsorption force of particles, which can measure the microscopic details of the adsorption process, measure the dynamic adsorption force of particles, and has the characteristics of high precision, non-destructive operation and easy operation. It helps to deeply understand the particle adsorption process, optimize the design of adsorption equipment, and promote the further application of the adsorption process in various fields.

[0006] In a first aspect, this application provides a device for measuring the dynamic adsorption force on particles, including: a base cylinder, a rectifier, a centering guide device, a negative pressure fan, and a camera;

[0007] The top of the base tube is open, and a first opening is made on the side wall of the base tube to facilitate pipe installation;

[0008] The rectifier includes: a glass tube, a rectifier mesh plate, and a suction hole component; the glass tube is installed on the top of the base tube, and the bottom of the glass tube is provided with a second opening and a corresponding threaded hole for installing the suction hole component; the rectifier mesh plate is installed on the top of the glass tube; the suction hole component includes: a suction pipe and a suction plate, the suction pipe is installed at the bottom of the glass tube and communicates with the inside of the glass tube, the suction plate is installed in the suction pipe, and the suction plate is provided with suction holes for adsorption;

[0009] The centering guide device includes: a bracket, an X-axis translation stage, a Z-axis translation stage, and a guide tube. The X-axis translation stage is mounted on the bracket, the Z-axis translation stage is mounted on the X-axis translation stage via a first connecting plate, and the guide tube is mounted on the Z-axis translation stage via a second connecting plate. By adjusting the adjustment knobs on the X-axis and Z-axis translation stages, the guide tube can be moved left and right, and up and down.

[0010] The negative pressure fan is connected to the bottom of the suction port via a pipe.

[0011] The camera is mounted next to the base tube, with its field of view facing the inside of the glass tube.

[0012] By adjusting the X-axis and Z-axis translation stages, the bottom opening of the guide tube is vertically aligned with the suction hole at the top of the suction device, with a certain distance between the bottom opening of the guide tube and the suction hole. The negative pressure fan is turned on and adjusted to the required negative pressure level. After being rectified by the rectifier plate, the external air enters the glass tube evenly, creating a negative pressure environment. The camera is set up next to the glass tube on a tripod, and its field of view is adjusted to face the inside of the glass tube before shooting. An experimental particle is placed into the top opening of the guide tube. Under the action of gravity and the adsorption force generated by the negative pressure environment, it is adsorbed onto the suction hole of the suction plate. Using the images captured by the camera, the falling speed of the experimental particle at each moment is analyzed frame by frame using target trajectory tracking technology, and the acceleration is calculated. Then, the net force on the seed at each moment is calculated. After subtracting the weight of the experimental particle, the adsorption force on the experimental particle can be obtained.

[0013] Further optionally, in one possible implementation of the first aspect, the measuring device further includes a fixing rod disposed on the rectifier plate for clamping and fixing the guide tube.

[0014] Adjust the guide tube so that the bottom opening of the guide tube is vertically aligned with the suction hole at the top of the suction device, and the bottom opening of the guide tube is spaced a certain distance from the suction hole. Fix the guide tube by setting a fixing rod on the rectifier plate to prevent the guide tube from shaking during the experiment, ensuring that the measurement results of the adsorption process are more reliable and accurate. At the same time, fixing the guide tube can also simplify the operation steps, reduce the possibility of human error, and make the experimental process more stable and controllable.

[0015] Further optionally, in one possible implementation of the first aspect, the measuring device for the dynamic adsorption force on the aforementioned particles further includes: a supplementary light and a light-absorbing plate. The supplementary light is positioned on the same side as the camera, and the light-absorbing plate is horizontally and symmetrically positioned on both sides of the base cylinder with respect to the camera.

[0016] Placing a supplementary light on the same side as the camera provides additional light to the testing area, ensuring sufficient brightness in the captured images and preventing blurry or unclear particle identification due to insufficient light. This ensures that particle details are accurately captured and recorded. A light-absorbing plate, symmetrically positioned horizontally to the camera, provides a background for the camera's shots. The plate has a solid-color surface that reduces reflections, ensuring a clean and uncluttered background and minimizing interference. This allows subsequent image analysis software to more accurately identify and track particle movement, facilitating more precise particle identification.

[0017] Further alternatively, in one possible implementation of the first aspect, a flange is provided on the suction pipe, the suction pipe is installed at the second opening at the bottom of the glass cylinder through the flange, and is fixed by bolts and threaded holes, so that the suction pipe is connected to the inside of the glass cylinder. A groove is also provided on the suction pipe, and a suction plate is installed in the groove.

[0018] The flange ensures a secure connection between the suction pipe and the glass cylinder, preventing air leakage or loosening. The connection between the suction pipe and the inside of the glass cylinder allows the negative pressure inside the suction pipe to be transmitted to the inside of the glass cylinder, achieving the effect of particle adsorption. At the same time, the groove design facilitates the installation and replacement of the suction plate, making experiments convenient.

[0019] Further optionally, in one possible implementation of the first aspect, the measuring device for the dynamic adsorption force on the particles further includes: at least two suction discs, and the suction holes of at least two of the suction discs have different diameters.

[0020] By setting suction plates with suction holes of different diameters, the adsorption characteristics and experimental requirements of different experimental particles can be adapted to suit various needs. During experiments, a suction plate with an appropriate suction hole diameter can be selected based on the specific research objectives and experimental requirements to obtain the desired adsorption force level and effect, providing valuable data and information for the design and optimization of adsorption equipment.

[0021] Further alternatively, in one possible implementation of the first aspect, a plurality of perforated holes are provided on the base tube to reduce weight.

[0022] By setting several perforated holes in the base cylinder, the weight of the entire device can be reduced, achieving a lightweight design and lowering costs.

[0023] Secondly, this application provides a method for measuring the dynamic adsorption force on particles, applicable to a device for measuring the dynamic adsorption force on particles, comprising the following steps:

[0024] Step 1: Select the experimental particle to be tested and measure its weight;

[0025] Step 2: After installing the measuring device for the dynamic adsorption force on the particles, adjust the guide tube using the X-axis translation stage and Z-axis translation stage, turn on the negative pressure fan, and adjust and turn on the camera to take pictures;

[0026] Step 3: Place the experimental particles to be tested into the top opening of the guide tube. Under the adsorption force generated by gravity and negative pressure, they are adsorbed onto the suction holes of the suction plate.

[0027] Step 4: Using the images captured by the camera, analyze the falling speed of the experimental particles frame by frame at each moment using target trajectory tracking technology, and calculate the acceleration accordingly. Then, calculate the net force on the seed at each moment, subtract the gravity of the experimental particles, and obtain the adsorption force on the experimental particles.

[0028] Further optionally, in one possible implementation of the second aspect, the measuring device for the dynamic adsorption force on the particles further includes: a suction plate with several suction holes of different diameters, a supplementary light, and a light-absorbing plate;

[0029] Step 2 above specifically includes: for the experimental particles to be tested, select a suction plate with a suitable diameter suction hole, install the measuring device for the dynamic adsorption force on the particles, then adjust the guide tube, turn on the negative pressure fan, set up a supplementary light on the same side of the camera and turn on the supplementary light, set up a horizontally symmetrical light-absorbing plate for the camera, and then adjust and turn on the camera to take pictures.

[0030] Understandably, the above-mentioned technical features can be combined with each other as long as they do not conflict with each other.

[0031] The beneficial effects of this application are:

[0032] 1. High-precision measurement: By using camera capture and target trajectory tracking technology, the motion trajectory and velocity of particles during the adsorption process can be recorded and analyzed in real time. Simultaneously, by calculating the net force acting on the particles at various moments, the dynamic adsorption force on the particles can be obtained. This method of measuring dynamic adsorption force can provide more comprehensive and accurate adsorption force data, helping to deepen the understanding of particle behavior and interactions during the adsorption process.

[0033] 2. Providing microscopic details: Cameras can capture microscopic details of particles during the adsorption process, such as morphological changes and adsorption sites. This helps to gain a deeper understanding of the mechanisms and behaviors of particle adsorption and provides a reference for the optimization of adsorption equipment.

[0034] 3. Non-destructive measurement: This device and method do not require any physical or chemical treatment of the particles and will not damage their properties or structure. This preserves the original state of the particles and avoids the influence of external interference on the measurement results, ensuring the accuracy of the results.

[0035] 4. Ease of Operation: The device has a simple structure and is easy to operate. By adjusting the device parameters, such as the position of the guide tube and the magnitude of the negative pressure, experiments can be conducted quickly and accurate measurement results can be obtained. Operators can conduct experiments without complex training.

[0036] In summary, the apparatus and method provided in this application are characterized by high precision, non-destructive nature, and ease of operation, which can help to deepen the understanding and control of particle adsorption processes and promote the application of adsorption processes in various fields.

[0037] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0038] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments of this application taken in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of this application.

[0039] Figure 1 This is a schematic diagram of the structure of the device for measuring the dynamic adsorption force on particles, as shown in an embodiment of this application.

[0040] Figure 2 This is a schematic diagram of the structure of the glass tube shown in an embodiment of this application;

[0041] Figure 3 This is a schematic diagram of the suction hole component shown in an embodiment of this application;

[0042] Figure 4 This is a schematic diagram of the alignment guide device shown in an embodiment of this application.

[0043] Reference numerals: 1-Base cylinder, 101-First opening, 2-Rectifier, 201-Glass cylinder, 202-Rectifier mesh plate, 203-Suction hole component, 204-Suction pipe, 205-Suction plate, 206-Flange, 207-Groove, 208-Suction hole, 209-Second opening, 210-Threaded hole, 3-Centering guide device, 301-Bracket, 302-X-axis translation stage, 303-Z-axis translation stage, 304-Guide tube, 305-First connecting plate mounting, 306-Second connecting plate, 4-Negative pressure fan, 401-Pipe, 5-Camera, 6-Fixing rod, 7-Supplemental light, 8-Light absorption plate. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. Furthermore, the technical features involved in the various embodiments described below can be combined with each other as long as they do not conflict with each other. The following detailed description, in conjunction with specific embodiments, further illustrates this application.

[0045] like Figure 1-4 As shown, this application provides a device for measuring the dynamic adsorption force on particles, including: a base cylinder 1, a rectifier 2, a centering guide device 3, a negative pressure fan 4, and a camera 5;

[0046] The top of the base cylinder 1 is open, and a first opening 101 is opened on the side wall of the base cylinder 1 to facilitate the installation and arrangement of the pipe 401. Several hollow holes are set in the base cylinder 1, which can reduce the weight of the entire device, realize lightweight design, and reduce costs.

[0047] The rectifier 2 includes: a glass tube 201, a rectifier mesh plate 202, and a suction hole component 203. A glass tube 201 is installed on the top of the base tube 1. A second opening 209 and a threaded hole 210 for installing a suction device 203 are provided at the bottom of the glass tube 201. A rectifier mesh plate 202 is installed on the top of the glass tube 201 by bolt connection. The rectifier mesh plate 202 has a honeycomb structure. The suction device 203 includes a suction pipe 204 and a suction plate 205. A flange 206 is provided on the suction pipe 204. The suction pipe 204 is installed at the second opening 209 at the bottom of the glass tube 201 through the flange 206. A sealing ring is added at the connection and it is fixed by bolts to the threaded hole 210, so that the suction pipe 204 is connected to the inside of the glass tube 201. A groove 207 is also provided on the suction pipe 204. The suction plate 205 is installed in the groove 207 and has suction holes 208 for adsorbing particles.

[0048] The centering guide device 3 includes: a bracket 301, an X-axis translation stage 302, a Z-axis translation stage 303, and a guide tube 304. The X-axis translation stage 302 is mounted on the top crossbar of the bracket 301. The Z-axis translation stage 303 is mounted on the X-axis translation stage 302 via a first connecting plate 305. The guide tube 304 is mounted on the Z-axis translation stage 303 via a second connecting plate 306. The bracket 301 is constructed from 30*30 aluminum alloy profiles connected by bolts. The X-axis translation stage 302 and the Z-axis translation stage 303 are precision translation stages. By adjusting the knobs on the X-axis translation stage 302 and the Z-axis translation stage 303, the guide tube 304 can be moved left and right and up and down to align with the air intake hole 208. The guide tube 304 is a hollow tube.

[0049] The negative pressure fan 4 is connected to the bottom of the suction pipe 204 via pipe 401. By driving the negative pressure fan 4, a negative pressure environment can be created in the glass cylinder 201. At the same time, by adjusting the driving force of the negative pressure fan 4, the intensity of the negative pressure environment can be controlled, thereby affecting the magnitude of the particle adsorption force.

[0050] Camera 5 is mounted next to the base tube 1, with its field of view facing the inside of the glass tube 201. Camera 5 is a high-speed camera with autofocus, which can record the rapid movement of particles during the adsorption process and provide more detailed image information.

[0051] After installation, adjust the X-axis translation stage 302 and Z-axis translation stage 303 to make the bottom opening of the guide tube 304 vertically aligned with the suction hole 208 at the top of the suction device 203, with a certain distance between the bottom opening of the guide tube 304 and the suction hole 208. Then turn on the negative pressure fan 4 and adjust it to the negative pressure required for the experiment. After the external air is rectified by the rectifier plate 202, it enters the glass tube 201 evenly, creating a negative pressure environment in the glass tube. Set up the camera 5 next to the base tube 1 on a tripod, adjust the field of view of the camera 5 to be aligned with the inside of the glass tube 201, and start taking pictures. Put an experimental particle into the top opening of the guide tube 304. Under the action of gravity and negative pressure environment, the experimental particle is adsorbed onto the suction hole of the suction plate 208. By reading the images captured by camera 5, the falling speed of the experimental particles at each moment is analyzed frame by frame using existing target trajectory tracking technology, and the acceleration is calculated accordingly. Then, the net force on the seed at each moment is calculated using Newton's second law (F=ma). After subtracting the gravity of the experimental particles, the dynamic adsorption force on the experimental particles at each moment can be obtained.

[0052] In this embodiment, the rectifier screen 202 is provided with a fixing rod 6 for clamping and fixing the guide tube 304. After the guide tube 304 is adjusted, by setting the fixing rod 6 on the rectifier screen 202, the guide tube 304 can be prevented from shaking during the experiment, ensuring that the measurement results of the adsorption process are more reliable and accurate. At the same time, fixing the guide tube 304 can also simplify the operation steps, reduce the possibility of human error, and make the experimental process more stable and controllable.

[0053] In this embodiment, the measuring device for the dynamic adsorption force on the particles of this application further includes: a supplementary light 7 and a light-absorbing plate 8. The light-absorbing plate 8 and the camera 5 are horizontally and symmetrically arranged on both sides of the base cylinder 1, and the supplementary light 7 and the camera 5 are arranged on the same side. The light-absorbing plate 8 is a solid-color light-absorbing plate, and its color can be selected as a reference color of the experimental particles. The supplementary light 7 is adjusted according to the actual site position so that there are no shadows in the shooting area of ​​the camera 5.

[0054] A supplementary light 7 is placed on the same side as camera 5 to provide additional light to the test site, ensuring sufficient brightness in the captured image and preventing blurry images or unclear particle identification due to insufficient light. This ensures that particle details can be accurately captured and recorded. A light-absorbing plate 8, symmetrically positioned horizontally to the camera, provides a background for the camera's shooting. The light-absorbing plate 8 has a solid-color surface that reduces reflections, ensuring a clean and uncluttered background in the captured image and minimizing interference. This allows subsequent image analysis software to more accurately identify and track particle movement, facilitating more precise particle identification.

[0055] In this embodiment, the measuring device for the dynamic adsorption force on the particles of this application further includes: a suction plate 205 with multiple suction holes 208 of different diameters.

[0056] By setting suction plates 205 with suction holes 208 of different diameters, the adsorption characteristics and experimental requirements of different experimental particles can be adapted to meet the needs of the experiment. During the experiment, a suction plate with a suitable suction hole diameter can be selected according to the specific research objectives and experimental requirements to obtain the required adsorption force level and effect, providing valuable data and information for the design and optimization of adsorption equipment.

[0057] This application provides a method for measuring the dynamic adsorption force on particles, applicable to the measuring device for the dynamic adsorption force on particles of this application, comprising the following steps:

[0058] Step 1: Select the experimental particle to be tested and measure its weight;

[0059] Step 2: Based on the size of the experimental particles, select a suction plate 05 with a suitable diameter suction hole 208. Then install the measuring device for the dynamic adsorption force on the particles. Adjust the guide tube 304 through the X-axis translation stage 302 and the Z-axis translation stage 303. Turn on the negative pressure fan 4. Set and install the supplementary light 7 and turn it on. Set and install the light absorption plate 8. Then adjust and turn on the camera 5 to take pictures.

[0060] Step 3: The experimental particles to be tested are placed into the top opening of the guide tube 304. Under the action of gravity and negative pressure, the experimental particles are adsorbed onto the suction hole 208.

[0061] Step 4: By reading the images captured by camera 5, analyze the falling speed of the experimental particles frame by frame using existing target trajectory tracking technology, calculate the acceleration, and then calculate the net force on the seed at each moment using Newton's second law. After subtracting the gravity of the experimental particles, the dynamic adsorption force on the experimental particles at each moment can be obtained.

[0062] In summary, the device and method provided by this utility model have the characteristics of high precision, non-destructive nature and ease of operation, which can help to deeply understand and control the particle adsorption process and promote the application of the adsorption process in various fields.

[0063] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the application and are not intended to limit it. Although the application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the protection scope of the application.

Claims

1. A device for measuring the dynamic adsorption force on particles, characterized in that it comprises: Base tube (1), rectifier (2), centering guide device (3), negative pressure fan (4), camera (5); The top of the base tube (1) is open, and a first opening (101) is provided on the side wall of the base tube (1) to facilitate pipe installation. The rectifier (2) includes: a glass tube (201), a rectifier mesh plate (202), and a suction hole component (203); the glass tube (201) is installed on the top of the base tube (1), and the bottom of the glass tube (201) is provided with a second opening (209) and a corresponding threaded hole (210) for installing the suction hole component (203); the rectifier mesh plate (202) is installed on the top of the glass tube (201); the suction hole component (203) includes: a suction pipe (204) and a suction plate (205), the suction pipe (204) is installed on the bottom of the glass tube (201) and communicates with the interior of the glass tube (201), the suction plate (205) is installed in the suction pipe (204), and the suction plate (205) is provided with suction holes (208) for adsorption. The centering guide device (3) includes: a bracket (301), an X-axis translation stage (302), a Z-axis translation stage (303), and a guide tube (304). The X-axis translation stage (302) is mounted on the bracket (301), the Z-axis translation stage (303) is mounted on the X-axis translation stage (302) via a first connecting plate (305), and the guide tube (304) is mounted on the Z-axis translation stage (303) via a second connecting plate (306). The negative pressure fan (4) is connected to the bottom of the suction port (203) through a pipe (401); The camera (5) is mounted next to the base tube (1), and the field of view of the camera (5) is directed toward the inside of the glass tube (201).

2. The measuring device according to claim 1, characterized in that, The measuring device further includes a fixing rod (6), which is disposed on the rectifier plate (202) and is used to clamp and fix the guide tube (304).

3. The measuring device according to claim 1 or 2, characterized in that, The measuring device also includes: a supplementary light (7) and a light-absorbing plate (8); the supplementary light (7) is set on the same side as the camera (5), and the light-absorbing plate (8) is set horizontally and symmetrically on both sides of the base cylinder (1) with the camera (5).

4. The measuring device according to claim 1, characterized in that, The suction pipe (204) is provided with a flange (206), and the suction pipe (204) is installed at the second opening at the bottom of the glass cylinder (201) through the flange (206) and is connected and fixed to the threaded hole (210) by bolts; the suction pipe (204) is also provided with a groove (207), and the suction plate (205) is installed in the groove (207).

5. The measuring device according to claim 1, characterized in that, The number of suction disks (205) is at least two, and the diameter of the suction holes of at least two suction disks (205) is different.

6. The measuring device according to claim 1, characterized in that, The base cylinder (1) is provided with hollow holes, and the number of hollow holes is at least two.

7. A method for measuring the dynamic adsorption force on particles, the method being applicable to the measuring device of claim 1, characterized in that, The measurement method includes the following steps: Step 1: Select the experimental particle to be tested and measure its weight; Step 2: After installing the measuring device for the dynamic adsorption force of the particles, adjust the guide tube (304) through the X-axis translation stage (302) and Z-axis translation stage (303), turn on the negative pressure fan (4), and adjust and turn on the camera (5) to take pictures; Step 3: The experimental particles to be tested are placed into the top opening of the guide tube (304). Under the action of the adsorption force generated by gravity and negative pressure environment, they are adsorbed onto the air suction hole (208) of the suction plate (205). Step 4: Using the images captured by the camera (5), the falling speed of the experimental particles at each moment is analyzed frame by frame using target trajectory tracking technology, and the acceleration is calculated accordingly. Then, the net force on the seed at each moment is calculated, and the adsorption force on the experimental particles is obtained after subtracting the gravity of the experimental particles.

8. The method for measuring the dynamic adsorption force on particles according to claim 7, characterized in that, The measuring device for the dynamic adsorption force of the particles also includes: a supplementary light (7) and a light-absorbing plate (8), and the rectifier (2) includes a suction plate (205) with at least two suction holes of different diameters. Step 2 above specifically includes: for the experimental particles to be tested, select a suction plate (205) with a suitable diameter suction hole, install the measuring device for the dynamic adsorption force of the particles, then adjust the guide tube (304), turn on the negative pressure fan (4), set up a supplementary light (7) on the same side of the camera (5) and turn on the supplementary light (7), set up a light-absorbing plate (8) that is horizontally symmetrical with the camera (5), and then adjust and turn on the camera (5) to take pictures.

Images