Device and method for testing wetting angle of tiny droplets using laser

Abstract

The present invention discloses a device and method for testing the wetting angle of tiny liquid droplets using laser, belonging to the field of chemical analysis technology, the device comprises a support column and a support rod on its upper part, an automatic liquid dripping assembly and a laser scanner are arranged on the support rod; a movable mobile platform is arranged on the top of the stage on the side of the support column, which can be moved to the bottom of the automatic liquid dripping assembly or the bottom of the laser scanner; the laser emitted by the laser emitter on the side of the mobile platform is emitted through the liquid droplets on the mobile platform, and the laser induction scale on the opposite side can collect the laser intensity at different positions, and the data of the laser scanner and the laser induction scale are processed by a computer to simulate the functional relationship between height and light intensity, so as to perform 3D modeling on the liquid droplet shape, and the wetting angle at any angle can be checked at any time. The present invention has fast measurement speed and high efficiency, and can realize the measurement of the surface shape of soft and ultra-thin objects such as tiny liquid droplets.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical analysis, and in particular relates to a device and a method for testing the wetting angle of a tiny droplet using laser. Background Art

[0002] The solid-liquid wetting angle is an important parameter to characterize the physical and chemical properties of a substance. In the field of interface chemical analysis, wetting angle testing is the main means of analyzing the physical and chemical properties of the solid-liquid interface. However, due to physical and chemical changes in the test material and temperature gradients, it is very difficult to measure the wetting angle between a tiny droplet of liquid and a solid surface.

[0003] At present, the traditional wetting angle tester adopts a tubular furnace structure, which has the disadvantages of small sample space, inconvenient operation, and low measurement accuracy. In addition, the wetting angle can only be measured by the sessile drop method, and this method is affected by gravity, and the wetting angle will change over time. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for testing the wetting angle of tiny droplets using laser, aiming to solve the technical problems that the existing wetting angle tester has a small sampling space, inconvenient operation, low measurement accuracy, and the wetting angle changes over time due to the influence of gravity when using the sessile drop method for measurement.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A device for testing the wetting angle of tiny droplets using laser, comprising an upright support column and a support rod horizontally arranged on its upper portion, one end of the support rod being connected to the support column, an automatic drip assembly and a laser scanner being arranged on the support rod at intervals; a stage is arranged on the side of the support column, a mobile platform for receiving droplets to be measured is arranged on the top of the stage, and the mobile platform can be moved below the automatic drip assembly or below the laser scanner; a laser emitter is arranged on the side of the mobile platform for emitting laser to the droplets to be measured on the mobile platform; a laser sensing scale corresponding to the laser emitter is arranged on the side of the support column, and the laser sensing scale is used to collect laser intensities at different positions; the laser scanner and the laser sensing scale are both connected to a computer.

[0007] Preferably, the support column and the stage are both arranged on a base, a level bubble is provided on the upper surface of the base, and an adjustment knob is provided on the bottom of the base for adjusting the levelness of the base.

[0008] Preferably, upright ribs are provided around the support column and between the base.

[0009] Preferably, upright ribs are respectively arranged between the upper and lower sides of the support rod and the support column.

[0010] Preferably, a moving knob for driving the moving platform to translate is provided on the side of the stage, and the moving knob can be used to move the moving platform to the bottom of the automatic dripping assembly or the bottom of the laser scanner.

[0011] Preferably, the automatic dripping assembly comprises a liquid storage tube and a needle, and the test liquid in the liquid storage tube can drip downwards through the needle.

[0012] Preferably, the laser emitter is capable of emitting multiple laser arrays symmetrically along the central axis, and the laser sensing ruler is arranged on the opposite side of the laser emitter, and the sizes of the two match; the laser sensing ruler has a built-in laser sensing sheet for collecting laser intensities at different positions, and aligning different heights by calculating the coordinate differences of positions with different light intensities.

[0013] The present invention also provides a method for testing the wetting angle of a tiny liquid droplet using a laser, and the method comprises the following steps:

[0014] (1) Adjust the laser scanner and the mobile platform to a horizontal state; place a solid test piece capable of receiving droplets on the top of the mobile platform, and inject the test liquid into the automatic droplet assembly;

[0015] (2) Move the mobile platform to the bottom of the automatic dripping component, turn on the automatic dripping component to form large droplets and drop them onto the mobile platform, and move the mobile platform to the bottom of the laser scanner;

[0016] (3) Laser scanning modeling: Start the computer, laser scanner and laser transmitter. The laser transmitter and laser sensing ruler test and calculate the height of the large droplet on the mobile platform and record the coordinates. The laser scanner scans the large droplet on the mobile platform and combines the test calculation results and the recorded coordinates to establish the corresponding function of the reflected light intensity and height. The large droplet is 3D modeled through function calculation.

[0017] (4) Second droplet scanning modeling: Only start the laser scanner, use the light intensity and function curve of each point measured by the laser scanner to process the results and obtain a 3D model;

[0018] (5) Using the functional relationship obtained in step (3) and the 3D model established in step (4), we can record and read the wetting angle at any position, with an order of magnitude of 2×10 -2 Mm.

[0019] Furthermore, in step (3), the principle of laser scanning modeling is as follows:

[0020] The laser sensing scale is provided with an OXZ coordinate system, which corresponds to the OXZ system in the OXYZ coordinate system on the laser scanner;

[0021] When the laser transmitter is working, the emitted array laser is irradiated onto the opposite laser sensing scale, and the coordinates of the highest point Ⅰ of the outer contour of the dripping droplet and points Ⅱ and Ⅲ on the left and right sides of point Ⅰ are obtained. The reference point α is set as the position of the upper surface of the solid test piece on the laser sensing scale irradiated by the array laser. The position is a horizontal line, and α is taken as one of the points. The coordinates of the reference point α are calculated to obtain the corresponding heights h1, h2, and h3 of points Ⅰ, Ⅱ, and Ⅲ;

[0022] When the laser scanner is working, the laser is emitted to the solid test piece and the droplet to be tested on the stage, and is collected by the laser scanner after diffuse reflection. The position where the reflected light is weakest is the highest point of the droplet. The light intensity Q1 and three-dimensional coordinates (X1, Y0, Z1) of the highest point I are determined. At the same time, the three-dimensional coordinates (X2, Y0, Z2) and (X3, Y0, Z3) of points II and III, as well as the light intensities Q2 and Q3 of points III and III are also determined. The corresponding functional relationship between height and light intensity is established as follows:

[0023]

[0024] Where: H i -Height, mm; Q i - light intensity, nm; a-conversion coefficient; A-correction coefficient 1; B-correction coefficient 2;

[0025] In the above formula, a, A, and B are determined by substituting the arrays (h1, Q1), (h2, Q2), and (h3, Q3) into the corresponding functional relationship between the height and light intensity mentioned above, where:

[0026] h1=Z1-Z α ;

[0027] h2=Z2-Z α ;

[0028] h3=Z3-Z α ;

[0029] In the formula, Z α is the coordinate of the reference point α on the Z axis; Z1 is the coordinate of point Ⅰ on the Z axis; Z2 is the coordinate of point Ⅱ on the Z axis; Z3 is the coordinate of point Ⅲ on the Z axis; X1 is the coordinate of point Ⅰ on the X axis; X2 is the coordinate of point Ⅱ on the X axis; X3 is the coordinate of point Ⅲ on the X axis; Y0 is the coordinate of point Ⅰ, point Ⅱ, and point Ⅲ on the Y axis;

[0030] 3D modeling of large droplets through function calculation.

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

[0032] The present invention installs an automatic drip assembly and a laser scanner on the support rod at the top of the support column, and installs a movable mobile platform on the lower stage, which can be moved to the bottom of the automatic drip assembly or the bottom of the laser scanner as needed; the laser emitted by the laser emitter on the side of the mobile platform is emitted through the droplets on the mobile platform, and the laser intensities at different positions can be collected by using the laser sensing scale on the opposite side, and the data of the laser scanner and the laser sensing scale are processed by a computer to realize 3D modeling of the droplet shape, and the wetting angle at any angle can be checked at any time. The present invention can avoid the systematic error and random error caused by the measurement force in high-precision measurement, and conveniently realize the measurement of the surface shape of soft and ultra-thin objects such as tiny droplets, while the measurement speed is fast and the efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0034] In the attached picture:

[0035] Figure 1 A schematic diagram of the structure of a device for testing the wetting angle of a tiny droplet using laser provided in an embodiment of the present invention;

[0036] Figure 2 Schematic diagram of the relative positions of the laser emitter and the laser sensing scale in an embodiment of the present invention;

[0037] Figure 3 A flow chart of laser scanning modeling in a method for testing the wetting angle of a tiny droplet using laser provided in an embodiment of the present invention;

[0038] Figure 4 A schematic diagram of the principle of laser scanning modeling in the present invention;

[0039] In the figure:

[0040] 1-support column; 2-laser sensor scale; 3-rib plate; 4-base; 5-adjustment knob; 6-rib plate; 7-automatic drip assembly; 8-laser scanner; 9-moving platform; 10-laser transmitter; 11-stage; 12-moving knob; 13-level bubble; 14-support rod; 15-computer; 16-transmission line; 17-laser sensor sheet; 18-laser array; 19-support seat. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and Examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In the following detailed description of the present invention, some specific details are described in detail. However, for the parts not described in detail, those skilled in the art can also fully understand the present invention.

[0042] In addition, those skilled in the art should understand that the drawings are only provided to illustrate the purpose, features and advantages of the present invention, and the drawings are not actually drawn to scale.

[0043] At the same time, unless the context clearly requires otherwise, the words "include", "comprises" and similar words throughout the specification and claims should be interpreted as inclusive rather than exclusive or exhaustive; that is, the meaning is "including but not limited to".

[0044] like Figure 1 As shown, a device for testing the wetting angle of a tiny droplet by using laser comprises an upright support column 1 and a support rod 14 horizontally arranged on its upper part, one end of the support rod 14 is connected to the support column 1, and an automatic drip assembly 7 and a laser scanner 8 are arranged on the support rod 14 at intervals; a stage 11 is arranged on the side of the support column 1, and a mobile platform 9 for receiving the droplet to be measured is arranged on the top of the stage 11, and the mobile platform 9 can be moved to the bottom of the automatic drip assembly 7 or the bottom of the laser scanner 8; a laser emitter 10 is arranged on the side of the mobile platform 9, which is used to emit laser to the droplet to be measured on the mobile platform; a laser sensing scale 2 corresponding to the laser emitter 10 is arranged on the side of the support column 1, and the laser sensing scale 2 is used to collect the laser intensity at different positions; the laser scanner 8 and the laser sensing scale 2 are connected to a computer 15 through a transmission line 16. Among them, the laser scanner can be a line laser measuring instrument (for example: LJ-V7060 line laser measuring instrument produced by Keyence Corporation), which can emit and collect laser.

[0045] In addition, since the wetting angle exists at the solid-liquid interface, a solid test piece can also be placed on the top of the mobile platform. The test piece is the solid phase and is not limited to the surface material of the mobile platform. The liquid droplets of the automatic dripping component fall on the solid test piece, which can also complete the wetting angle test.

[0046] As a preferred structure, Figure 1As shown, the support column 1 and the stage 11 are both arranged on the base 4. The upper surface of the base 4 is provided with a level bubble 13, which can visually observe the levelness of the base; the bottom of the base 4 is provided with an adjustment knob 5 for adjusting the levelness of the base 4. The base and the automatic drip assembly 7, laser scanner 8, stage 11 and moving platform thereon are adjusted by adjusting the knob 5 to keep them level, thereby improving the accuracy of the test.

[0047] During the specific manufacturing process, upright ribs 3 are respectively provided between the surrounding of the support column 1 and the base 4 to ensure that the support column is firmly installed on the base. Similarly, upright ribs 6 are respectively provided between the upper and lower sides of the support rod 14 and the support column 1 to improve the stability of the support rod.

[0048] As a preferred structure, Figure 1 As shown, a moving knob 12 for driving the translation of the moving platform 9 is provided on the side of the stage 11, and the moving knob 12 can be used to move the moving platform 9 to the bottom of the automatic drip assembly 7 or the bottom of the laser scanner 8. In specific production, the moving knob can be coaxially fixed with the internal gear, and a rack meshing with the gear is installed at the bottom of the moving platform. The translation of the moving platform can be achieved by driving the gear rack mechanism through the moving knob. This is a prior art and will not be repeated again.

[0049] In a specific embodiment of the present invention, Figure 1 As shown, the automatic drip assembly 7 includes a liquid storage tube 71 and a needle 72, and the test liquid in the liquid storage tube 71 can drip downward through the needle 72. In the specific design, a micro electric pump can be installed at the outlet of the lower end of the liquid storage tube. The micro electric pump is controlled by a computer and can control the liquid output, thereby controlling the size of the droplets.

[0050] Further optimize the above scheme, such as Figure 1 , Figure 2 As shown, the laser emitter 10 can emit multiple laser arrays 18 symmetrically along the central axis, and the laser sensing scale 2 is set on the opposite side of the laser emitter 10. The laser emitter 10 and the laser sensing scale 2 are parallel and arranged opposite to each other, and the sizes of the two are matched; the laser sensing scale 2 has a built-in laser sensing sheet 17 for collecting laser intensities at different positions, and calculating the coordinate difference of different light intensity positions to mark different heights. Among them, the laser array refers to a group of lasers arranged in regular rows and columns, Figure 2 The middle dashed line indicates that the lasers at the same height are in the same horizontal plane in space.

[0051] The present invention also provides a method for testing the wetting angle of a tiny liquid droplet using a laser, and the method comprises the following steps:

[0052] (1) Adjust the knob 5 so that the level bubble 13 on the base 4 is in the middle position, so that the base and the laser scanner 8 and the mobile platform 9 thereon are in a horizontal state; place a solid test piece capable of receiving droplets on the top of the mobile platform 9, and inject the test liquid into the automatic droplet assembly 7;

[0053] (2) Move the mobile platform 9 to the bottom of the automatic dripping assembly 7, turn on the automatic dripping assembly 7 to form large droplets and drop them onto the mobile platform 9, and then move the mobile platform 9 to the bottom of the laser scanner 8 by moving the knob 12;

[0054] (3) Laser scanning modeling: Start the computer 15, laser scanner 8 and laser transmitter 10. The laser transmitter 10 and laser sensing scale 2 test and calculate the height of the large droplet on the mobile platform 9 and record the coordinates. The laser scanner 8 scans the large droplet on the mobile platform 9 and establishes a corresponding function between the intensity and height of the reflected (diffuse reflected) light in combination with the test calculation results and the recorded coordinates. The large droplet is 3D modeled by function calculation. The principle of laser scanning modeling is as follows:

[0055] The laser sensing scale is provided with an OXZ two-dimensional plane coordinate system, which corresponds to the OXZ system in the OXYZ three-dimensional coordinate system on the laser scanner;

[0056] When the laser transmitter is working, the emitted array laser irradiates the opposite laser sensing scale, and the coordinates of the highest point Ⅰ and points Ⅱ and Ⅲ of the outer contour of the dripping droplet are obtained. Points Ⅱ and Ⅲ are two arbitrary points close to the left and right sides of point Ⅰ, because the entire laser array first extends longitudinally from one point and then arranges the left and right mirror images. Set the reference point α as the position on the laser sensing scale where the upper surface of the solid test piece just passes through the array laser. This position is a horizontal line, and α is taken as one of the points; the coordinates of the reference point α are calculated to obtain the corresponding heights h1, h2, and h3 of points Ⅰ, Ⅱ, and Ⅲ (h1, h2, and h3 refer to the distances of points Ⅰ, Ⅱ, and Ⅲ from the reference point a in the vertical direction);

[0057] When the laser scanner is working, the laser is emitted to the solid test piece and the droplet to be tested on the stage, and is collected by the laser scanner after diffuse reflection. The position of the weakest reflected light is the highest point of the droplet, and the light intensity Q1 and three-dimensional coordinates (X1, Y0, Z1) of the highest point I are determined. At the same time, the three-dimensional coordinates (X2, Y0, Z2) and (X3, Y0, Z3) of points II and III, and the light intensities Q2 and Q3 of points III and III are also determined. Since different liquid volumes have different degrees of light absorption, the light intensity diffusely reflected by the droplet is also different, and the corresponding functional relationship between height and light intensity is established as follows:

[0058]

[0059] Where: Hi -Height, mm; Q i - light intensity, nm; a-conversion coefficient; A-correction coefficient 1; B-correction coefficient 2;

[0060] In the above formula, a, A, and B are determined by substituting the arrays (h1, Q1), (h2, Q2), and (h3, Q3) into the corresponding functional relationship between the height and light intensity mentioned above, where:

[0061] h1=Z1-Z α ;

[0062] h2=Z2-Z α ;

[0063] h3=Z3-Z α ;

[0064] In the formula, Z α is the coordinate of the reference point α on the Z axis; Z1 is the coordinate of point Ⅰ on the Z axis; Z2 is the coordinate of point Ⅱ on the Z axis; Z3 is the coordinate of point Ⅲ on the Z axis; X1 is the coordinate of point Ⅰ on the X axis; X2 is the coordinate of point Ⅱ on the X axis; X3 is the coordinate of point Ⅲ on the X axis; Y0 is the coordinate of point Ⅰ, point Ⅱ, and point Ⅲ on the Y axis;

[0065] 3D modeling of large droplets through function calculation.

[0066] (4) Second droplet scanning modeling: Only the laser scanner 8 is started, and the light intensity and function curve of each point measured by the laser scanner are used to process the results to obtain a 3D model.

[0067] (5) Using the functional relationship obtained in step (3) and the 3D model established in step (4), we can record and read the wetting angle at any position, with an order of magnitude of 2×10 -2 Mm.

[0068] The specific application process of the present invention is as follows:

[0069] Start the power supply and computer 15, adjust the base 4 to a horizontal level by observing the level bubble 13 through the leveling knob 5, place a solid test piece with flat upper and lower surfaces on the movable platform 9, and inject the test liquid into the automatic dripping component 7; operate the moving knob 12 to adjust the movable platform 9 to the bottom of the automatic dripping component 7, start the automatic dripping component 7, and adjust the movable platform 9 to the bottom of the laser scanner 8 after a large droplet is formed; start the laser scanner 8, the laser transmitter 10 and the laser sensing ruler 2, the laser transmitter 10 and the laser sensing ruler 2 test and calculate the droplet height and record the coordinates, the laser scanner 8 scans the large droplet, and the computer collects the test results, calculation results and recorded coordinates, and uses the formula to establish the corresponding function of the reflected light intensity and the height. When the drip test is performed again, the large droplet can be directly 3D modeled by the function calculation formula just obtained, and then the droplet can be scanned and modeled again at any time according to the needs, and the laser sensing ruler 2 and the laser transmitter 10 are no longer needed to calibrate the height.

[0070] The basic principle of the present invention is to apply a non-contact laser measurement method, using a laser source (point light source or line light source) with a regular geometric shape to project onto the surface of the droplet to be measured. The droplet changes the angle of the imaging light beam, and the formed diffuse reflection light spot (or light band) is imaged on the image sensor of the laser scanner. The position of the imaging point also changes immediately. The spatial coordinates of the measured point are calculated based on the determination of the imaging point position and the system optical path geometric parameters according to the triangle principle.

[0071] In summary, the present invention has the advantages of simple structure, convenient operation, strong adjustability, and high measurement accuracy, and can improve measurement efficiency. The present invention models tiny droplets through laser scanning, and can record the wetting angles at different times and different orientations, solving the problem that the current wetting angle test is affected by time and gravity and has large observation errors. The laser scanning technology and mathematical calculation technology used in the present invention are relatively complete, and can eliminate the influencing factors such as gravity and time, thereby more accurately measuring the wetting angle, so as to optimize the next engineering or experimental design.

[0072] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A method for testing the wetting angle of a tiny droplet using laser, characterized in that: The test is carried out using a device for testing the wetting angle of a tiny droplet using a laser, and includes the following steps: (1) Adjust the laser scanner and the mobile platform to a horizontal state; place a solid test piece capable of receiving droplets on the top of the mobile platform, and inject the test liquid into the automatic droplet assembly; (2) Move the mobile platform to the bottom of the automatic dripping component, turn on the automatic dripping component to form large droplets and drop them onto the mobile platform, and move the mobile platform to the bottom of the laser scanner; (3) Laser scanning modeling: Start the computer, laser scanner and laser transmitter. The laser transmitter and laser sensing ruler test and calculate the height of the large droplet on the mobile platform and record the coordinates. The laser scanner scans the large droplet on the mobile platform and combines the test calculation results and the recorded coordinates to establish a corresponding function between the reflected light intensity and the height. The large droplet is 3D modeled through function calculation. The principle of laser scanning modeling is as follows: The laser sensing scale is provided with an OXZ coordinate system, which corresponds to the OXZ system in the OXYZ coordinate system on the laser scanner; When the laser transmitter is working, the emitted array laser is irradiated onto the opposite laser sensing scale, and the coordinates of the highest point Ⅰ of the outer contour of the dripping droplet and points Ⅱ and Ⅲ on both sides of point Ⅰ are obtained. The reference point α is set as the position of the upper surface of the solid test piece on the laser sensing scale irradiated by the array laser. The position is a horizontal line, and α is taken as one of the points. The coordinates of the reference point α are calculated to obtain the corresponding heights h1, h2, and h3 of points Ⅰ, Ⅱ, and Ⅲ. When the laser scanner is working, the laser is emitted to the solid test piece and the droplet to be tested on the stage, and is collected by the laser scanner after diffuse reflection. The position where the reflected light is weakest is the highest point of the droplet. The light intensity Q1 and three-dimensional coordinates (X1, Y0, Z1) of the highest point I are determined. At the same time, the three-dimensional coordinates (X2, Y0, Z2) and (X3, Y0, Z3) of points II and III, as well as the light intensities Q2 and Q3 of points III and III are also determined. The corresponding functional relationship between height and light intensity is established as follows: ； Where: H i -Height, mm; Q i - light intensity, nm; a-conversion coefficient; A-correction coefficient 1; B-correction coefficient 2; In the above formula, a, A, and B are determined by substituting the arrays (h1, Q1), (h2, Q2), and (h3, Q3) into the corresponding functional relationship between the height and light intensity mentioned above, where: h1=Z1-Z α ; h2=Z2-Z α ; <h2 style=";text-align:left;direction:ltr">h3=Z3-Z<h2 style=";text-align:left;direction:ltr"> α <h2 style=";text-align:left;direction:ltr"> ; In the formula, Z α is the coordinate of the reference point α on the Z axis; Z1 is the coordinate of point Ⅰ on the Z axis; Z2 is the coordinate of point Ⅱ on the Z axis; Z3 is the coordinate of point Ⅲ on the Z axis; X1 is the coordinate of point Ⅰ on the X axis; X2 is the coordinate of point Ⅱ on the X axis; X3 is the coordinate of point Ⅲ on the X axis; Y0 is the coordinate of point Ⅰ, point Ⅱ, and point Ⅲ on the Y axis; 3D modeling of large droplets through function calculation; (4) Second droplet scanning modeling: Only start the laser scanner, use the light intensity and function curve of each point measured by the laser scanner to process the results and obtain a 3D model; (5) Using the functional relationship obtained in step (3) and the 3D model established in step (4), we can record and read the wetting angle at any position, with an order of magnitude of 2×10 -2 mm; The device for testing the wetting angle of tiny droplets using laser comprises an upright support column and a support rod horizontally arranged on its upper portion, one end of the support rod is connected to the support column, and an automatic drip assembly and a laser scanner are arranged on the support rod at intervals; a stage is arranged on the side of the support column, and a mobile platform for receiving droplets to be measured is arranged on the top of the stage, and the mobile platform can be moved under the automatic drip assembly or under the laser scanner; a laser emitter is arranged on the side of the mobile platform, and is used to emit laser to the droplets to be measured on the mobile platform; a laser sensing scale corresponding to the laser emitter is arranged on the side of the support column, and the laser sensing scale is used to collect laser intensities at different positions; the laser scanner and the laser sensing scale are both connected to a computer.

2. The method for testing the wetting angle of a tiny droplet using laser according to claim 1, characterized in that: The support column and the loading platform are both arranged on the base. The upper surface of the base is provided with a level bubble, and the bottom of the base is provided with an adjustment knob for adjusting the levelness of the base.

3. The method for testing the wetting angle of a tiny droplet using laser according to claim 2, characterized in that: Vertical rib plates are respectively arranged around the supporting column and between the base.

4. The method for testing the wetting angle of a tiny droplet using laser according to claim 1, characterized in that: Upright ribs are respectively arranged between the upper and lower sides of the support rod and the support column.

5. The method for testing the wetting angle of a tiny droplet using laser according to claim 1, characterized in that: A moving knob for driving the moving platform to translate is provided on the side of the stage, and the moving platform can be moved to the bottom of the automatic dripping assembly or the bottom of the laser scanner by the moving knob.

6. The method for testing the wetting angle of a tiny droplet using laser according to claim 1, characterized in that: The automatic dripping assembly comprises a liquid storage tube and a needle, and the test liquid in the liquid storage tube can drip downwards through the needle.

7. The method for testing the wetting angle of a tiny droplet using laser according to claim 1, characterized in that: The laser emitter can emit multiple laser arrays symmetrically along the central axis. The laser sensing ruler is set on the opposite side of the laser emitter, and the sizes of the two match. The laser sensing ruler has a built-in laser sensing sheet for collecting laser intensities at different positions and calibrating different heights by calculating the coordinate differences of different light intensity positions.

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