A synchronous measurement system for visualizing the transient impact force and morphology of droplets

Abstract

This invention relates to the field of fluid mechanics experimental technology, specifically to a synchronous measurement system for the transient impact force and morphology of a droplet. The system includes a droplet generation device; an impact force sensing device positioned at the end of the droplet's fall path and fixing the sample; an image acquisition device positioned around the sample; a triggering device positioned around the droplet's fall path; and a control system electrically and communicatively connected to the impact force sensing device, image acquisition device, and triggering device. Upon receiving a trigger signal from the triggering device, the control system synchronously activates the image acquisition device and the impact force sensing device. This invention places the triggering device around the droplet's fall path, detects passing droplets, and generates a trigger signal. Upon receiving the trigger signal, the control system immediately and synchronously activates the image acquisition device and the impact force sensing device. This allows for the simultaneous measurement of dynamic image data and mechanical dynamic data of the droplet impacting the sample shortly before impact, effectively reducing the amount of blank data generated during measurement.

Description

Technical Field

[0001] This invention relates to the field of fluid mechanics experimental technology, specifically to a synchronous measurement system for visualizing the transient impact force and morphology of droplets. Background Technology

[0002] The phenomenon of droplet impact on solid surfaces is widespread in daily life and production. For example, in the green energy field, raindrops impacting the surface of wind turbine blades cause erosion, while in the aerospace field, droplets impacting heat shields generate impact loads. Liquid impact involves morphological evolution, energy transfer, and the mechanism of action on solid surfaces, which is of great significance to materials research and development, and shape design.

[0003] Currently, morphological measurements during droplet impact primarily rely on high-speed photography to acquire images of morphological evolution, while impact force measurements are mostly performed using high-sensitivity sensors (such as piezoelectric or strain gauge sensors). In existing experimental systems, the high-speed camera for morphological measurement and the high-sensitivity sensor for impact force measurement are usually performed independently. That is, the morphology is first recorded using a high-speed camera, and then the force is estimated through simulation; or the force and morphology are measured separately, and attempts are made to align them over time. However, the force and morphological changes during droplet impact measured using these methods are often difficult to analyze accurately due to the weak correlation between force and image data.

[0004] Therefore, to improve the correlation between the force measured during droplet impact and image data, attempts have gradually begun to explore the synchronous triggering of force and image data detection. However, currently commonly used synchronous triggering methods typically employ delayed triggering based on an assumed droplet impact moment or manual advance triggering. The timing of droplet impact is difficult to determine precisely, leading to delayed triggering measurements occurring well before the actual impact, resulting in extended periods of "empty data" during the non-impact process, or measurements not being triggered at the moment of impact. Manual advance triggering, which begins synchronous recording before the droplet impact, also generates extended periods of "empty data" during the non-impact process, impacting data processing.

[0005] Therefore, existing methods for synchronously measuring the force and shape data of liquid impact processes using delayed triggering or manual advance triggering are difficult to control accurately with high-speed cameras and high-sensitivity sensors to perform synchronous measurements just before the droplet impacts, thus affecting the measurement data. Summary of the Invention

[0006] The purpose of this invention is to provide a synchronous measurement system for the visualization of the transient impact force and morphology of droplets, so as to solve the technical problem in the prior art of accurately controlling high-speed cameras and high-sensitivity sensors to perform synchronous measurements when droplets are about to impact.

[0007] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0008] A synchronous measurement system for visualizing the transient impact force and morphology of droplets, comprising:

[0009] A droplet generating device for producing droplets that fall naturally;

[0010] An impact force sensing device is disposed at the end of the droplet's falling path, and the sample being impacted is fixed at the detection end of the impact force sensing device; the impact force sensing device is used to detect and collect the mechanical dynamic data when the droplet impacts the sample.

[0011] An image acquisition device is disposed around the sample, and the image acquisition device is used to acquire dynamic image data of the droplets impacting the sample;

[0012] A triggering device is disposed around the droplet's path of descent. The triggering device is used to detect the passing droplet and generate a triggering signal.

[0013] The control system is electrically connected to the impact force sensing device, the image acquisition device, and the triggering device. The control system is used to synchronously start the image acquisition device and the impact force sensing device to capture signals after receiving the trigger signal.

[0014] As a preferred embodiment of the present invention, the triggering device includes a photoelectric sensor and a data acquisition device. The photoelectric sensor is disposed around the droplet's falling path and is used to generate a light beam perpendicular to the falling path.

[0015] The data acquisition device is electrically connected to the photoelectric sensing device, the impact sensing device, and the image acquisition device. The photoelectric sensing device is used to output an electrical signal after the droplet blocks the light beam and transmit the electrical signal to the data acquisition device. After receiving the electrical signal, the data acquisition device generates the trigger signal.

[0016] The data acquisition device is electrically connected to the control system and is used to transmit trigger signals to the control system.

[0017] In a preferred embodiment of the present invention, the photoelectric sensing device includes a laser and a photoelectric sensor, the laser and the photoelectric sensor being disposed on opposite sides of the droplet's falling path, with the laser's emitting end facing the photosensitive element of the photoelectric sensor, and the photoelectric sensor being electrically connected to the data acquisition unit.

[0018] As a preferred embodiment of the present invention, the impact force sensing device includes a piezoelectric sensing device and a charge amplifier. The piezoelectric sensing device is used to carry the sample and generate charge when the droplet impacts the sample. The piezoelectric sensing device is electrically connected to the charge amplifier to amplify the charge generated by the piezoelectric sensing device.

[0019] The charge amplifier is electrically connected to the data acquisition unit to transmit the amplified charge to the data acquisition unit, and the data acquisition unit is electrically connected to the control system to convert the amplified charge into a digital signal and transmit it to the control system, thereby generating the dynamic mechanical data.

[0020] In a preferred embodiment of the present invention, the piezoelectric sensing device includes a base, a collision disk, and a piezoelectric sensor. The piezoelectric sensor is fixed on the base, and the collision disk is disposed on the piezoelectric sensor and located at the end of the droplet's falling path to support the sample. The piezoelectric sensor is used to collect the mechanical dynamic data of the droplet impacting the sample and convert it into charge output.

[0021] Furthermore, the piezoelectric sensor is electrically connected to the charge amplifier.

[0022] As a preferred embodiment of the present invention, the image acquisition device includes a high-speed camera and a cold light source. The high-speed camera and the cold light source are respectively disposed on both sides of the droplet's falling path, and the head of the high-speed camera is positioned facing the cold light source. The high-speed camera is used to acquire dynamic image data when the droplet impacts the sample.

[0023] The high-speed camera is electrically connected to the control system and is used to transmit the dynamic image data of the droplet impacting the sample to the control system.

[0024] As a preferred embodiment of the present invention, the droplet generating device includes a micro-injection pump and a needle, the micro-injection pump and the needle being connected by a tubing, and the micro-injection pump being used to pump liquid into the needle and form a spherical droplet at the end of the needle.

[0025] The micro-injection pump is configured to be manually operated.

[0026] As a preferred embodiment of the present invention, the measuring system further includes a coordinate frame, the needle is fixed on the coordinate frame, and the height of the needle can be adjusted with reference to the scale on the coordinate frame;

[0027] The end of the needle is positioned vertically toward the collision disk, and the end of the needle is flat, for generating uniform spherical droplets.

[0028] As a preferred embodiment of the present invention, the measurement system further includes an experimental platform, wherein the base, the coordinate frame, the high-speed camera, the cold light source, the photoelectric sensor and the laser are all fixed on the experimental platform.

[0029] As a preferred embodiment of the present invention, the control system includes a computer, which is electrically connected to the high-speed camera, the data acquisition unit, and the piezoelectric sensor.

[0030] The computer has built-in software for processing dynamic mechanical data and dynamic image data, which is used to analyze and process the dynamic mechanical data and the dynamic image data.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] This invention places the triggering device around the droplet's fall path to detect passing droplets and generate a trigger signal. After receiving the trigger signal, the control system immediately and synchronously starts the image acquisition device and the impact force sensing device. Shortly before the droplet impacts the sample, it simultaneously measures the dynamic image data and mechanical dynamic data of the droplet impact process, effectively reducing the amount of blank data generated in the measurement. Attached Figure Description

[0033] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the composition structure of the droplet transient impact force and morphology visualization synchronous measurement system provided in an embodiment of the present invention;

[0035] Figure 2 A schematic diagram of the composition structure of the photoelectric sensing device in the synchronous measurement system for visualizing the transient impact force and morphology of droplets provided in an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of the composition structure of the impact force sensing device in the synchronous measurement system for visualizing and measuring the transient impact force and morphology of droplets provided in an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the composition of the image acquisition device of the synchronous measurement system for visualizing the transient impact force and morphology of droplets provided in an embodiment of the present invention.

[0038] The labels in the diagram represent the following:

[0039] 1-Coordinate frame; 2-Needle; 3-Cold light source; 4-Laser; 5-Collision disk; 6-Photoelectric sensor; 7-High-speed camera; 8-Piezoelectric sensor; 9-Base;

[0040] 61-Photosensitive element. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1:

[0043] like Figure 1-4 As shown, this invention provides a synchronous measurement system for visualizing and measuring the transient impact force and morphology of droplets. It is mainly used for synchronously measuring the transient impact force and morphology of droplets during transient impact, and includes:

[0044] A droplet generating device for producing droplets that fall naturally;

[0045] An impact force sensor is placed at the end of the droplet's fall path, with the sample being impacted fixed at the detection end of the impact force sensor. The impact force sensor is used to detect and collect dynamic mechanical data when the droplet impacts the sample.

[0046] An image acquisition device is installed around the sample and is used to acquire dynamic image data of droplets impacting the sample.

[0047] A triggering device is installed around the droplet's path. The triggering device is used to detect the passing droplets and generate a trigger signal.

[0048] The control system is electrically connected to the impact force sensing device, the image acquisition device, and the triggering device. The control system is used to synchronously start the image acquisition device and the impact force sensing device to capture signals after receiving the trigger signal.

[0049] The present invention aims to place a triggering device around the droplet's path to detect passing droplets and generate a trigger signal. After receiving the trigger signal, the control system immediately and synchronously starts the image acquisition device and the impact force sensing device. Shortly before the droplet impacts the sample, the system simultaneously measures the dynamic image data and mechanical dynamic data of the droplet impact process, effectively reducing the amount of blank data generated in the measurement.

[0050] Specifically:

[0051] After the droplet generator produces droplets that fall naturally, they impact the sample in the impact force sensing device perpendicularly along their fall path. During this process, the droplet generates a trigger signal via a triggering device, which transmits the signal to the control system. Upon receiving the trigger signal, the control system simultaneously activates the image acquisition device and the impact force sensing device to measure the dynamic image data and mechanical dynamic data of the droplet impacting the sample, respectively. This effectively reduces the delay error caused by asynchronous measurements, which affects the accuracy of the correlation between the dynamic image data and the mechanical dynamic data.

[0052] In this invention, "visualization" refers to the visualization of droplet morphology, that is, the dynamic image data acquired by the image acquisition device during the droplet's impact on the sample, i.e., the "morphological visualization" of the droplet.

[0053] Example 2:

[0054] Based on Example 1, such as Figure 1 , Figure 2 As shown, the triggering device of the present invention includes a photoelectric sensing device and a data acquisition device. The photoelectric sensing device is disposed around the droplet's falling path and is used to generate a light beam perpendicular to the falling path.

[0055] The data acquisition unit is electrically connected to the photoelectric sensing device, the impact sensing device, and the image acquisition device. The photoelectric sensing device is used to output an electrical signal after the droplet blocks the light beam and transmit the electrical signal to the data acquisition unit. After receiving the electrical signal, the data acquisition unit generates a trigger signal.

[0056] The data acquisition unit is electrically connected to the control system and is used to transmit trigger signals to the control system.

[0057] In this embodiment, the photoelectric sensing device can output an electrical signal when the droplet falls to the position of the light beam. After receiving the electrical signal from the photoelectric sensing device, the data acquisition device (not shown) generates a trigger signal and transmits it to the control system. After receiving the trigger signal, the control system immediately and synchronously starts the impact force sensing device and the image acquisition device to realize the synchronous measurement of the mechanical dynamic data and the image dynamic data of the droplet impacting the sample.

[0058] As a preferred embodiment, the photoelectric sensing device includes a laser 4 and a photoelectric sensor 6, which are respectively located on both sides of the droplet's falling path, with the emitting end of the laser 4 facing the photosensitive element 61 of the photoelectric sensor 6. The photoelectric sensor 6 is electrically connected to the data acquisition unit.

[0059] The laser beam emitted by laser 4 must illuminate the photosensitive element 61 of the photoelectric sensor 6, and this beam must pass through the path of the falling droplet. The height of the beam is determined by the height of the impact point, typically about 10mm above the impact point, and can be adjusted according to experimental requirements. Initially, the beam continuously illuminates the photosensitive element 61. As the droplet falls, it blocks the beam, causing a change in the detection signal of the photoelectric sensor 6, which is then transmitted to the data acquisition unit.

[0060] Example 3:

[0061] Based on Example 2, such as Figure 1 , Figure 3 As shown, the impact force sensing device of the present invention includes a piezoelectric sensing device and a charge amplifier. The piezoelectric sensing device is used to carry a sample and generate a charge when a droplet impacts the sample. The piezoelectric sensing device is electrically connected to the charge amplifier to amplify the charge generated by the piezoelectric sensing device.

[0062] Furthermore, the charge amplifier is electrically connected to the data acquisition unit to transmit the amplified charge to the data acquisition unit, and the data acquisition unit is electrically connected to the control system to convert the amplified charge into a digital signal for transmission to the control system, and to generate dynamic mechanical data.

[0063] In this embodiment, the piezoelectric sensing device is connected to a charge amplifier (not shown). When a droplet impacts the sample, the piezoelectric sensing device converts the impact force into an electrical signal, generating a tiny charge. The impact force is proportional to the charge generated by the piezoelectric sensing device. This charge is converted into a voltage signal in the charge amplifier, amplified, and then transmitted to a data acquisition unit. The data acquisition unit converts the amplified voltage signal into a digital signal and transmits it to the control system for processing, forming dynamic mechanical data.

[0064] As a preferred embodiment, the piezoelectric sensing device includes a base 9, a collision disk 5, and a piezoelectric sensor 8. The piezoelectric sensor 8 is fixed on the base 9, and the collision disk 5 is disposed on the piezoelectric sensor 8 and located at the end of the droplet's falling path to support the sample. The piezoelectric sensor 8 is used to collect the mechanical dynamic data when the droplet impacts the sample and convert it into charge output.

[0065] Furthermore, the piezoelectric sensor 8 is electrically connected to the charge amplifier.

[0066] The collision disk 5 must be positioned in a straight line between the laser 4 and the photoelectric sensor 6 so that the beam can pass through the area directly above the collision disk 5 and be perpendicular to the droplet's falling path.

[0067] Furthermore, when the piezoelectric sensor 8 impacts the sample on the collision disk 5, the piezoelectric sensor 8 transfers charge to the charge amplifier, which amplifies the charge to generate a voltage signal that is transmitted to the data acquisition unit.

[0068] Example 4:

[0069] Based on Example 3, such as Figure 1 , Figure 4 As shown, the image acquisition device of the present invention includes a high-speed camera 7 and a cold light source 3. The high-speed camera 7 and the cold light source 3 are respectively located on both sides of the droplet's falling path, and the head of the high-speed camera 7 is set directly facing the cold light source 3. The high-speed camera 7 is used to acquire dynamic image data when the droplet hits the sample.

[0070] The high-speed camera 7 is electrically connected to the control system to transmit the dynamic image data of the droplets hitting the sample to the control system.

[0071] In this embodiment, the cold light source 3 is directly facing the high-speed camera 7 to provide illumination and effectively prevent the droplets from getting heated, thus reducing the degree of interference with the experimental temperature.

[0072] Specifically, the high-speed camera 7 records the process of droplets impacting the sample as continuous, clear frames at a frame rate of tens of thousands of frames, showcasing droplet deformation and edge breakage. Due to the extremely high frame rate and short exposure time of each frame, insufficient brightness from ordinary light sources would result in dark and unclear images. Therefore, a cold light source 3 is chosen to provide illumination. The cold light source 3 ensures sufficient brightness for shooting; it not only has high brightness but also does not generate high temperatures, thus introducing minimal system errors.

[0073] Example 5:

[0074] Based on Example 4, such as Figure 1 As shown, the droplet generating device of the present invention includes a micro-injection pump and a needle 2, which are connected by a tubing. The micro-injection pump is used to pump liquid into the needle 2 and form a spherical droplet at the end of the needle 2.

[0075] The micro-injection pump is configured to be manually operated.

[0076] In this embodiment, the micro-injection pump (not shown) is manually controlled and continuously and in minute increments pushes the syringe piston forward, delivering the liquid to the needle 2 through a tubing (not shown). A spherical droplet is generated at the end of the needle 2, and the droplet falls vertically when the gravity of the droplet is greater than the surface tension.

[0077] Among them, the micro-injection pump uses a stepper motor as the actuator, which converts the rotary motion into linear displacement through a lead screw, and precisely pushes the syringe piston.

[0078] As a preferred embodiment, the measuring system also includes a coordinate frame 1, with the needle 2 fixed on the coordinate frame 1, and the height of the needle 2 can be adjusted with reference to the scale on the coordinate frame 1;

[0079] The end of the needle 2 is positioned vertically toward the collision disk 5, and the end of the needle 2 is flat, which is used to generate uniform spherical droplets.

[0080] The coordinate frame 1 has a scale (not shown in the figure). By changing the height of the droplet falling, the height of the needle 2 on the coordinate frame can be adjusted according to the scale, thereby changing the speed of the droplet impact.

[0081] As an alternative, the measurement system also includes an experimental platform, on which the base 9, coordinate frame 1, high-speed camera 7, cold light source 3, photoelectric sensor 6 and laser 4 are all fixed.

[0082] Example 6:

[0083] Based on Example 5, such as Figure 1 As shown, the control system of the present invention includes a computer, which is electrically connected to a high-speed camera 7, a data acquisition unit, and a piezoelectric sensor 8.

[0084] The computer has built-in software for processing dynamic mechanical data and dynamic image data, which is used to analyze and process dynamic mechanical data and dynamic image data.

[0085] In this embodiment, the computer (not shown) can simultaneously start the high-speed camera 7 and the piezoelectric sensor 8. The high-speed camera 7 directly transmits image digital signals to the computer, and the piezoelectric sensor 8 transmits mechanical digital signals to the computer through a charge amplifier and a data acquisition unit.

[0086] The computer processes image digital signals and mechanical digital signals through built-in software, generating image dynamic data and mechanical dynamic data respectively.

[0087] The experimental steps of the above measurement system used in this invention include:

[0088] Connect all devices and begin the experiment. Complete the corresponding parameter settings on the computer's built-in software, select the appropriate needle 2 according to the required droplet diameter, and fix needle 2 on the coordinate frame 1. Adjust the height of the sample impact point relative to needle 2 to set the droplet impact velocity. Both the droplet diameter and impact velocity can be calibrated using the high-speed camera 7.

[0089] A micro-injection pump is manually operated to slowly generate a droplet at the tip of needle 2. When the weight of the droplet exceeds its surface tension, the droplet falls from the tip of needle 2 in a spherical shape. During its descent, the droplet first passes through the "beam" formed by laser 4, and then impacts the sample fixed on the collision disk 5.

[0090] When the "beam" of the photoelectric sensor 6 receiver is blocked, the receiver captures this changing light signal, converts it into a corresponding electrical signal, and transmits it to the data acquisition unit to generate a trigger signal.

[0091] Upon receiving a trigger signal, the computer synchronously activates the high-speed camera 7 and piezoelectric sensor 8 to capture the morphology and impact force of the droplet impacting the sample. The impact force data captured by the piezoelectric sensor 8 is converted into an electrical signal, generates a charge, is amplified by a charge amplifier, and transmitted to the data acquisition unit, where it is converted into a mechanical digital signal and then transmitted to the computer for software processing into dynamic mechanical data. The frames captured by the high-speed camera 7 are internally converted into image digital signals and directly transmitted to the computer for software processing into image dynamic data. This achieves synchronous measurement of morphology and impact force.

[0092] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A synchronous measurement system for visualizing the transient impact force and morphology of droplets, characterized in that, have: A droplet generating device for producing droplets that fall naturally; An impact force sensing device is disposed at the end of the droplet's falling path, and the sample being impacted is fixed at the detection end of the impact force sensing device; the impact force sensing device is used to detect and collect the mechanical dynamic data when the droplet impacts the sample. An image acquisition device is disposed around the sample, and the image acquisition device is used to acquire dynamic image data of the droplets impacting the sample; A triggering device is disposed around the droplet's path of descent. The triggering device is used to detect the passing droplet and generate a triggering signal. The control system is electrically connected to the impact force sensing device, the image acquisition device, and the triggering device. The control system is used to synchronously start the image acquisition device and the impact force sensing device to capture signals after receiving the trigger signal.

2. The droplet transient impact force and morphology visualization synchronous measurement system according to claim 1, characterized in that, The triggering device includes a photoelectric sensor and a data acquisition unit. The photoelectric sensor is disposed around the droplet's falling path and is used to generate a light beam perpendicular to the falling path. The data acquisition device is electrically connected to the photoelectric sensing device, the impact sensing device, and the image acquisition device. The photoelectric sensing device is used to output an electrical signal after the droplet blocks the light beam and transmit the electrical signal to the data acquisition device. After receiving the electrical signal, the data acquisition device generates the trigger signal. The data acquisition device is electrically connected to the control system and is used to transmit trigger signals to the control system.

3. The droplet transient impact force and morphology visualization synchronous measurement system according to claim 2, characterized in that, The photoelectric sensing device includes a laser (4) and a photoelectric sensor (6). The laser (4) and the photoelectric sensor (6) are respectively located on both sides of the droplet's falling path, and the emitting end of the laser (4) is directly facing the photosensitive element (61) of the photoelectric sensor (6). The photoelectric sensor (6) is electrically connected to the data acquisition unit.

4. The droplet transient impact force and morphology visualization synchronous measurement system according to claim 3, characterized in that, The impact force sensing device includes a piezoelectric sensing device and a charge amplifier. The piezoelectric sensing device is used to carry the sample and generate charge when the droplet impacts the sample. The piezoelectric sensing device is electrically connected to the charge amplifier to amplify the charge generated by the piezoelectric sensing device. The charge amplifier is electrically connected to the data acquisition unit to transmit the amplified charge to the data acquisition unit, and the data acquisition unit is electrically connected to the control system to convert the amplified charge into a digital signal and transmit it to the control system, thereby generating the dynamic mechanical data.

5. The droplet transient impact force and morphology visualization synchronous measurement system according to claim 4, characterized in that, The piezoelectric sensing device includes a base (9), a collision disk (5), and a piezoelectric sensor (8). The piezoelectric sensor (8) is fixed on the base (9). The collision disk (5) is disposed on the piezoelectric sensor (8) and located at the end of the droplet's falling path to support the sample. The piezoelectric sensor (8) is used to collect the mechanical dynamic data of the droplet impacting the sample and convert it into charge output. Furthermore, the piezoelectric sensor (8) is electrically connected to the charge amplifier.

6. The droplet transient impact force and morphology visualization synchronous measurement system according to claim 5, characterized in that, The image acquisition device includes a high-speed camera (7) and a cold light source (3). The high-speed camera (7) and the cold light source (3) are respectively located on both sides of the droplet's falling path, and the head of the high-speed camera (7) is set directly facing the cold light source (3). The high-speed camera (7) is used to acquire dynamic image data when the droplet hits the sample. The high-speed camera (7) is electrically connected to the control system and is used to transmit the dynamic image data of the droplet impacting the sample to the control system.

7. The droplet transient impact force and morphology visualization synchronous measurement system according to claim 6, characterized in that, The droplet generating device includes a micro-injection pump and a needle (2), which are connected by a tubing. The micro-injection pump is used to pump liquid into the needle (2) and form a spherical droplet at the end of the needle (2). The micro-injection pump is configured to be manually operated.

8. The droplet transient impact force and morphology visualization synchronous measurement system according to claim 7, characterized in that, The measurement system also includes a coordinate frame (1), the needle (2) is fixed on the coordinate frame (1), and the height of the needle (2) can be adjusted with reference to the scale on the coordinate frame (1); The end of the needle (2) is positioned vertically toward the collision disk (5), and the end of the needle (2) is flat, used to generate uniform spherical droplets.

9. The droplet transient impact force and morphology visualization synchronous measurement system according to claim 8, characterized in that, The measurement system also includes an experimental platform, on which the base (9), the coordinate frame (1), the high-speed camera (7), the cold light source (3), the photoelectric sensor (6) and the laser (4) are all fixed.

10. The droplet transient impact force and morphology visualization synchronous measurement system according to claim 9, characterized in that, The control system includes a computer, which is electrically connected to the high-speed camera (7), the data acquisition unit, and the piezoelectric sensor (8); The computer has built-in software for processing dynamic mechanical data and dynamic image data, which is used to analyze and process the dynamic mechanical data and the dynamic image data.

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