TWI789750B - Solid surface wettability determination method - Google Patents

Abstract

A solid surface wettability determination method is provided. A liquid is sprayed on a solid surface of an under-detected object. A light beam is incident toward the detected surface, and the light beam is reflected by the liquid on the detected surface to generate a reflected light ray. A photo sensor receives the reflected light ray. The photo sensor outputs a detecting signal related to the wettability of the detected surface according to the reflected light ray.

Description

Solid surface wettability detection method

The invention relates to a method for detecting the wettability of a solid surface, in particular to a method for judging the degree of surface wettability according to the intensity of reflected light generated by the reflection of a light beam by a liquid on the surface of a solid material.

The surface wettability of materials (Wettability, also known as affinity/hydrophobicity) depends on the chemical composition or geometric structure of the surface of solid materials. Currently, surface wettability can be changed through chemical or physical surface modification procedures. For example, after the shoe material is manufactured, its outer surface will be treated with oxygen plasma to become highly hydrophilic, so as to facilitate the smooth bonding of the shoe material to each other or the attachment of environmental protection on the shoe material. water glue. In order to confirm whether the surface modification of the shoe material is in good condition, it is necessary to detect the surface wettability of the shoe material.

The traditional way to detect surface wettability is to measure the contact angle between the liquid and the surface. Provide liquid on the surface, and take images of either side of the liquid to measure the contact angle, and then confirm the surface wettability through the size of the contact angle. However, the contact angle is a single-point measurement method, and it takes a long time to take images and measure the contact angle, so it cannot be applied to the detection of large-area surface wettability.

At present, a fluorescent detection method has been developed, which uses ultraviolet light to excite the fluorescence of chemical substances (such as hydroxide functional groups) that can provide wettability, and infers the amount of chemical substances on the surface according to the measured fluorescence intensity. Then determine the wettability of the surface. However, the fluorescence intensity is too weak, which makes the detection sensitivity low. Therefore, the application of the fluorescence detection method in the industry is limited, and it is not suitable for low contact angle detection.

In view of the above problems, the present invention discloses a method for detecting the wettability of a solid surface, which helps to solve the problems of difficulty in confirming the wettability of a large-area surface and poor detection accuracy in existing solid surface wettability detection.

The solid surface wettability detection method disclosed in the present invention comprises: spraying a liquid on a solid surface of an object to be detected; sending a light beam toward the solid surface of the object to be detected, and the light beam is reflected by the liquid on the solid surface to generate a Reflected light; use a light detection element to receive reflected light; make the light detection element receive reflected light, and output a detection signal related to the wettability of the solid surface according to the reflected light, and the detection signal is used as an indicator of surface wettability ; Select a corresponding signal contact angle relationship from a database according to the type of liquid and the material of the object to be detected; and compare the detection signal with the signal contact angle relationship to obtain the contact angle of the liquid on the solid surface.

According to the solid surface wettability detection method disclosed in the present invention, the liquid is sprayed on the solid surface of the object to be detected, and the light beam is reflected by the liquid on the solid surface to generate reflected light. The light detection element receives the reflected light and uses the output signal of the reflected light as a basis for confirming the wettability of the surface. For example, a signal with a larger value represents a highly hydrophilic surface, and a signal with a small value represents a surface with a low hydrophilicity (hydrophobicity). Compared with the existing solid surface wettability detection technology, the solid surface wettability detection method disclosed in the present invention can realize large-area solid surface wettability detection, and is suitable for application in product line analysis in the industry. In addition, the light received by the solid surface wettability detection system disclosed in the present invention is the reflected light generated by the light beam irradiating the liquid on the solid surface, so the detection result will not be affected by the shape, roughness, color, material and other factors.

The above description of the disclosure and the following description of the implementation are used to demonstrate and explain the spirit and principle of the present invention, and provide a further explanation of the patent application scope of the present invention.

The detailed features of the present invention are described in detail below in the implementation manner, and its content is enough to make any person familiar with the related art understand the technical content of the present invention and implement it accordingly. Those skilled in the art can easily understand the related objects and advantages of the present invention. The following examples further describe the concepts of the present invention in detail, but do not limit the scope of the present invention in any way.

Please refer to FIG. 1 , which is a schematic diagram of a detection system used in a method for detecting wettability of a solid surface according to an embodiment of the present invention. According to an embodiment of the present invention, the solid surface wettability detection system 1 includes a spray device 10 , a light emitting device 20 and a light detection element 30 .

The spray device 10 includes a liquid storage tank 110 , a spray head 120 and a pump 130 . The liquid storage tank 110 is configured to store liquid, such as but not limited to water, ethanol or silicone oil. The spray head 120 communicates with the liquid storage tank 110 , and the pump 130 is disposed between the liquid storage tank 110 and the spray head 120 . The pump 130 can draw the liquid in the liquid storage tank 110 out of the liquid storage tank 110 and deliver it to the spray head 120 . In this embodiment, the spray head 120 may include a liquid pressurized nozzle, a two-fluid nozzle or an ultrasonic nozzle.

The light emitting device 20 includes a light emitting element 210 , a light beam expansion unit 220 and a polarizing unit 230 . The light emitting element 210 is, for example but not limited to, a laser light emitter, a light emitting diode, a halogen lamp or a mercury lamp, which can be used to emit a light beam 211 . The beam constricting and expanding unit 220 is, for example but not limited to, a light collimator, which is configured to change the diameter of the light beam 211 and change the divergent light beam 211 into collimated light. The polarizing unit 230 is, for example but not limited to, a polarizer, which is configured to transform the light beam 211 passing through the beam shrinking and expanding unit 220 into polarized light with a single polarization direction.

The light detection element 30 is, for example but not limited to, a photoelectric detector, a photothermal detector, an optical power meter, a photosensitive coupling device (CCD) or a complementary metal oxide semiconductor (CMOS), which can sense light and convert the light The intensity is converted into a digital signal.

In this embodiment, the solid surface wettability detection system 1 further includes an analyzer 40 and a lens 50 , both of which are arranged corresponding to the light detection element 30 . The analyzer 40 is used to filter the light beam 211 entering the light detection element 30 to ensure that the light detection element 30 receives polarized light. The lens 50 is used to focus the light beam 211 to the light detecting element 30 .

The method for detecting the wettability of a solid surface according to an embodiment of the present invention is described below. Please refer to Figure 2 and Figure 3 together. 2 is a schematic diagram of detecting an object to be detected by the solid surface wettability detection system of FIG. 1 , and FIG. 3 is a schematic flowchart of a solid surface wettability detection method according to an embodiment of the present invention. According to an embodiment of the present invention, the method for detecting wettability of a solid surface includes steps S1-S6. The following description uses the solid surface wettability detection system 1 of FIG. 1 to implement the solid surface wettability detection method in FIG. 3 , but does not limit the device or system capable of performing the solid surface wettability detection method.

Step S1 is to spray liquid on a solid surface 21 of an object 2 to be detected. The object 2 to be detected is, for example but not limited to, shoe materials, ceramics, semiconductors, high molecular polymers, foam materials or cloths. The solid surface 21 is an outer surface exposed from the object 2 to be detected, and the outer surface has a certain degree of hydrophilicity or hydrophobicity. The pump 130 of the spray device 10 transports the liquid from the liquid storage tank 110 to the spray head 120 , and sprays the liquid particles evenly on the solid surface 21 through the spray head 120 . The liquid covers the solid surface 21 in different ways depending on the degree of wettability of the solid surface 21 . When the solid surface 21 has high hydrophilicity, the liquid particles will spread out on the solid surface 21 to form a liquid film. When the solid surface 21 has lower hydrophilicity (higher hydrophobicity), the liquid particles will gather on the solid surface 21 to form liquid particles of different sizes. FIG. 2 exemplarily illustrates that liquid particles are dispersed on a highly hydrophilic solid surface 21 to form a liquid film 3 .

Step S2 is to emit a light beam 211 towards the solid surface 21 of the object 2 to be detected, and the light beam 211 is reflected by the liquid on the solid surface 21 to generate a reflected light 212 . Referring to FIG. 2 , the light emitting element 210 of the surface wettability detection system 1 emits a light beam 211 toward a solid surface 21 . In this embodiment, the light emitting element 210 is a laser light emitter capable of emitting a laser beam.

The beam shrinking and expanding unit 220 properly adjusts the beam diameter of the passing beam 211 . When the light beam 211 irradiates the liquid on the solid surface 21 , the light beam 211 will be reflected by the liquid or scattered on the solid surface 21 according to the wettability of the solid surface 21 . Further, as shown in FIG. 2 , when the solid surface 21 has high hydrophilicity, the sprayed liquid will form a liquid film on the solid surface, and most of the light beam 211 will be reflected by the liquid film 3 to generate reflected light 212 . When the solid surface 21 has relatively low hydrophilicity, the sprayed liquid will form liquid particles on the solid surface, and most of the light beam 211 incident on the solid surface 21 will be scattered.

Step S3 is that the light detecting element 30 receives the reflected light 212 and outputs a detection signal related to the wettability of the solid surface 21 according to the reflected light 212 . Referring to FIG. 2 , the light detecting element 30 and the light emitting device 20 are respectively disposed on two opposite sides of the solid surface 21 . The light detecting element 30 receives the reflected light 212 and generates different signal values according to the light intensity of the reflected light 212 . Furthermore, for the highly hydrophilic solid surface 21 , the reflected light 212 generated by the reflection of the light beam 211 by the liquid film 3 has a higher light intensity, and thus the light detection element 30 will output a larger signal value. When the solid surface 21 has a lower hydrophilicity, most of the light in the light beam 211 is scattered on the solid surface 21, so the reflected light 212 generated has a lower light intensity, and the light detection element 30 will output a smaller signal. value.

The phenomenon that the light beam 211 is scattered by the liquid on the solid surface 21 can be further explained. FIG. 4 is a schematic diagram of the principle of detection of a substance to be detected by the surface wettability detection system in FIG. 1 . Differences in wettability of the solid surface 21 affect the liquid state change. When the incident light angle has been determined, the liquid form (droplet) with lower wettability (hydrophobicity) on the solid surface provides a smaller light reflection cross-section, and thus the light detection element 30 receives a reflection with a lower intensity The solid surface of the optical signal is shown in (A) of Figure 4. On the contrary, the liquid type (liquid film 3) with higher wettability (hydrophilicity) on the solid surface provides a larger light reflection cross section, which enables the light detection element 30 to receive a higher intensity reflected light signal from the solid surface, as shown in the figure 4 (B) shown.

In addition, as shown in FIG. 4, in this embodiment, the diameter of the incident light beam 211 is a, the average diameter of the liquid droplets formed by the liquid on the solid surface 21 is d, and the following conditions are satisfied: d/a > 0.25. When this condition is met, it can be ensured that all light rays of the incident light beam 211 can irradiate the liquid, avoiding the occurrence of light being reflected by the solid surface 21 , and helping to provide a high degree of discrimination in wettability detection.

Any detector that can receive light and convert the light signal (light intensity) into an electrical signal (detection signal) output can be used as the light detection element 30 of this embodiment, and the electrical signal output by the light detection element 30 can be current, voltage, heat, etc. For example, the light detection element 30 can be a photothermal detector or a photoelectric detector.

In this embodiment, the polarizing unit 230 can modulate the light beam 211 into polarized light, and the combination of the analyzer 40 and the lens 50 can focus the reflected light 212 which is also polarized light to the light detecting element 30 . Thus, when the solid surface 21 is a liquid film, the reflected light 212 received by the light detecting element 30 has a higher light intensity. When there are liquid particles on the solid surface 21, the intensity of the reflected light 212 received by the light detection element 30 is relatively low, thereby accurately judging whether the liquid on the solid surface 21 is a liquid film or a liquid particle, and providing a measure of wettability detection. High discrimination.

In this embodiment, the light detecting element 30 and the light emitting device 20 have the same included angle with respect to the normal N of the solid surface 21 . In detail, the light beam 211 generated by the light-emitting element 210 of the light-emitting device 20 has an included angle θ1 relative to the normal N of the solid surface 21, and the liquid film 3 reflects the light beam 211 to generate reflected light 212 relative to the normal N of the solid surface 21. The included angle θ2, and the included angles θ1 and θ2 are equal to each other. In this way, it can be ensured that the light detection element 30 only receives the reflected light 212 , and it is avoided that the light detection element 30 receives scattered light in addition to affect the detection result of the wettability of the solid surface.

Step S4 is to generate a surface wettability detection result according to the detection signal and the contact angle relationship of the signal. Furthermore, the measured detection signal needs to be further compared with a database to obtain a surface wettability detection result corresponding to a specific position on the solid surface 21 . The surface wettability detection result can be output by an electronic device (not shown). The surface wettability test result can be a text message or an image message indicating "wettability" or "not wettability", or a quantitative value that can indicate the degree of surface wettability.

The database can be established in advance, and the database is, for example, stored in a storage medium of a computer. The database includes a plurality of reference detection signals and contact angle values of the liquid on the solid surface, and a signal contact angle relationship is about the relationship between each reference detection signal and the contact angle corresponding to the reference detection signal. FIG. 5 is a schematic diagram of the relationship between the reference detection signal and the contact angle, wherein the reference detection signal takes a voltage value as an example.

The following exemplifies the method for establishing the signal contact angle relationship. After cutting the sample with the same material as the object 2 to be detected, each sample is subjected to surface modification through ultraviolet light or plasma, so that the solid surface of each sample has different degrees of surface wettability. The liquid is sprayed on the sample, and the liquid image is taken by an optical camera to measure the contact angle of the liquid on the solid surface of each sample, so as to know the degree of wettability of the liquid on the solid surface of each sample. Next, the solid surface wettability detection method disclosed in the present invention is used to detect the samples, and a plurality of detection signals respectively corresponding to these samples are obtained, and these detection signals are used as reference detection signals. Regression analysis is performed on the data including these reference detection signals and contact angles to establish a signal contact angle relationship curve. The signal contact angle relationship curve can specifically present the relationship between the wettability of the solid surface 21 and the detection signal obtained in step S4. The signal contact angle relationship is not limited to the relationship curve. In other embodiments, the signal contact angle relationship may refer to a data comparison table or graph of detection signal and contact angle.

The signal contact angle relationship curve can correspond to one of the liquids on the solid surface of a specific material of the detection object. For example, the signal contact angle relationship curve in Figure 5 corresponds to the hydroalcohol on the surface of the ethylene-vinyl acetate copolymer (EVA) sample, But the database can also store multiple signal contact angle relationship curves. FIG. 6 is a schematic diagram of contact angle relationship curves of multiple signals. The pre-established database may contain a plurality of signal contact angle relationship curves, which respectively correspond to different liquids or different materials of detection objects. In Figure 6, a number of signal contact angle relationship curves are provided, which can correspond to pure water on the surface of EVA shoe material (pure water-EVA), pure water on the surface of polyurethane (PU) shoe material (pure water-PU), Pure water on the surface of rubber shoe material (pure water-rubber), pure water on the surface of glass substrate (pure water-glass) and pure water on the surface of silicon wafer (pure water-silicon). These signal contact angle relationship curves can be pre-stored in the database of the surface wettability detection system 1 . Before the surface wettability detection system 1 starts detection (that is, before step S1 is performed) or after generating a detection signal (that is, after step S4 is completed), the suitable liquid can be selected according to the type of liquid used in the detection and the material of the object 2 to be detected. The signal contact angle relationship curve of the signal, and then compare the detected signal with the selected signal contact angle relationship curve to obtain the contact angle of the liquid on the solid surface 21 . The basis for selecting the signal contact angle relationship curve can be that the operator manually inputs information such as the type of liquid and the material of the object to be detected to the solid surface wettability detection system 1; or, the sensor (not shown) determines the type of liquid and the material to be detected. After detecting the material of the object, relevant information is output to the solid surface wettability detection system 1, and the solid surface wettability detection system 1 automatically selects a suitable signal contact angle relationship curve according to the information.

According to an embodiment of the present invention, the solid surface wettability detection system 1 further includes a computing unit. The computing unit is, for example, a computer or a processing chip installed inside the solid surface wettability detection system 1 . The computing unit is communicatively connected to the light detection element 30 to receive a detection signal from the light detection element 30 . The aforementioned database can be stored in the computing unit, or the computing unit can obtain the database from an external storage medium. The computing unit is used for comparing the detection signal with the database to know the wettability of the solid surface. That is to say, step S4 is executed through the computing unit.

After step S4 is executed, a surface wettability detection result corresponding to a single position of the solid surface 21 can be obtained. The method for detecting the wettability of the solid surface in this embodiment can further detect the wettability of other positions or even all positions of the solid surface 21 . The detection of the wettability of all positions of the solid surface 21 will be further described below.

Step S5 is to make the light beam 211 scan the solid surface 21 so that the light detection element 30 outputs a plurality of detection signals. Referring to FIG. 2 , the light emitting device 20 can move relative to the object 2 to be detected along a direction D perpendicular to the normal N of the solid surface 21 to detect the wettability of different positions on the solid surface 21 . The light detection element 30 receives the reflected light generated by the liquid at different positions on the solid surface 21 , and then outputs a plurality of detection signals, and these detection signals correspond to the wettability of each position of the solid surface 21 . 2 to further illustrate, when the light beam 211 scans the solid surface 21 and passes through a first position P1, the liquid film 3 at the first position P1 reflects the light beam 211 to generate reflected light 212, and the light detection element 30 receives the reflected light 212 to output a detection signal related to the surface wettability of the first position P1. When the light beam 211 scans the solid surface 21 and passes through a second position P2, the liquid film 3 located at the second position P2 reflects the light beam 211 to generate reflected light 212, and the light detecting element 30 receives the reflected light 212 and outputs the second position. Detection signal related to surface wettability of P2.

In addition, when the light beam 211 irradiates the solid surface 21 , the spray device 10 continuously sprays the liquid on the solid surface 21 . In other words, when step S5 is performed, the spraying device 10 continuously sprays the liquid, so that a complete liquid film 3 or sufficient liquid particles can exist on the solid surface 21 to maintain the reliability of the surface wettability detection result. The foregoing method of continuously spraying liquid during detection is not intended to limit the present invention. In some embodiments, the spraying of liquid may be stopped when step S5 is performed.

The aforementioned surface wettability detection result may be the contact angle information of the liquid on the solid surface 21 . According to the type of liquid and the material of the object to be detected, the solid surface wettability detection system 1 can select the corresponding signal contact angle relationship from the database, for example, select one of the multiple signal contact angle relationship curves in FIG. 6 . For example, in the case of spraying pure water on the surface of EVA material for wettability detection, the system can select the "pure water-EVA" curve as the signal contact angle relationship to be used in this detection. The plurality of detection signals obtained in step S5 are compared with the selected signal contact angle relationship, so as to obtain the contact angle of the liquid on the solid surface 21 . Although the solid surface wettability detection system 1 can use the light intensity value or voltage value to quantify the surface wettability, most users in the industry are still used to quantify the degree of wettability by the contact angle, so the surface wettability detection results are measured by contact Quantitative performance is helpful for more efficient follow-up product quality management.

The solid surface wettability detection method may further include a step S6. The step S6 is to generate a surface wettability distribution map according to the detection signals and the contact angle relationship of the signals. Please refer to FIG. 7 , which schematically illustrates an embodiment of a surface wettability distribution map.

For the multiple detection signals (such as voltage values) measured in step S5, compare them with the signal contact angle relationship in the database to obtain the surface wettability detection results (such as contact angle) corresponding to the solid surface 21 , and the surface wettability detection results are expressed in the form of distribution diagrams. In detail, after the step S5 is completed, the light detection element 30 transmits the detection signal to a computer (not shown). The computer includes image processing software, which can receive the detection signal and convert the detection signal into an image to be displayed on a display (not shown). According to the value of the detection signal corresponding to each position on the solid surface 21 , the surface wettability distribution map will present different color distributions or grayscale distributions. Taking FIG. 2 as an example, since a region of the solid surface 21 including the first position P1 has a relatively high hydrophilicity, the photodetection element 30 will output a detection signal with a large value, so the surface wettability distribution diagram is shown in white Indicates this area. Another region of the solid surface 21 including the second position P2 has lower hydrophilicity, and the light detection element 30 will output a detection signal with a smaller value, so this region is represented in dark gray in the surface wettability distribution diagram. Thereby, the user can quickly distinguish the abnormal wettability area on the solid surface 21 according to the surface wettability distribution map, so as to judge whether the object 2 to be detected is a defective product.

The surface wettability test results are not limited to the presentation of the surface wettability distribution map. In other embodiments, the surface wettability detection results may be presented in the form of charts or data comparison tables.

In addition, as shown in FIG. 2 , in an embodiment of the present invention, the included angle θ1 of the light beam 211 on the solid surface 21 is 30.0 degrees to 85.0 degrees. The included angle θ1 in an appropriate range helps to improve the discrimination rate of the solid surface wettability detection system 1 in detecting surface wettability. Please refer to Table 1 below, which shows the relationship between the included angle θ1 of the light beam 211 incident on the solid surface 21 and the discrimination rate. In one embodiment, the aforementioned detection signal and the reference detection signal are voltage values, and the discrimination rate is defined as the ratio of the voltage value corresponding to the hydrophilic region (liquid film) to the voltage value corresponding to the hydrophobic region (liquid particle) (also That is to say, discrimination rate=voltage value of hydrophilic region/voltage value of hydrophobic region).

Table I Angle of incidence (degrees) 30.0 40.0 50.0 60.0 70.0 80.0 85.0 Identification rate 4.3 5.5 5.4 8.4 17.5 38.3 30.1

According to Table 1, when the included angle θ1 is 30.0 degrees to 85.0 degrees, the voltage value corresponding to the hydrophilic region is obviously greater than the voltage value of the hydrophobic region, more specifically, the two voltage values may have a difference of more than 4 times. Therefore, the solid surface wettability detection system disclosed in the present invention can accurately distinguish the highly hydrophilic region and the low hydrophilic region on the solid surface 21, that is, it can accurately identify the difference between the liquid film and the liquid particle, and further identify the solid surface. 21 The hydrophilicity and hydrophobicity of each region. When the included angle θ1 is less than 30.0 degrees, the discrimination rate of the solid surface wettability detection system 1 will decrease, which may lead to the inability to clearly identify the boundary between the high hydrophilic area and the low hydrophilic area. When the included angle θ1 is greater than or equal to 90.0 degrees, the incident light cannot be focused on the sample surface, and the light detecting element 30 cannot receive enough reflected light 212 . Therefore, the included angle θ1 is less than 90.0 degrees, which is helpful to accurately identify the difference between the liquid film and the liquid particles, and the included angle θ1 is preferably 30.0 degrees to 85.0 degrees.

The numerical range of the above included angle θ1 relates to the polarized reflection of the incident light on the liquid. When the liquid and solid surfaces have been determined, when the incident light reaches the liquid-air interface at an incident angle of less than 30.0 degrees, the reflectivity caused by the liquid film or liquid particles is less than 3%, and enters at an incident angle higher than 30.0 degrees Upon reaching a liquid, the reflectivity increases significantly as the angle of incidence increases.

To sum up, in the solid surface wettability detection system and the solid surface wettability detection method disclosed in the present invention, the liquid is sprayed on the solid surface of the object to be detected, and the light beam is reflected by the liquid on the solid surface to generate reflected light . The light detection element receives the reflected light and outputs a detection signal. The detection signal can be used as a basis for confirming the wettability of the surface. For example, a detection signal with a larger value represents a highly hydrophilic surface, and a detection signal with a small value represents a surface with a low hydrophilicity (hydrophobicity). Compared with the existing solid surface wettability detection technology, the surface wettability detection system disclosed in the present invention can realize the wettability detection of a large-area solid surface, and is suitable for application in the industry's product line analysis. In addition, the light received by the solid surface wettability detection system disclosed in the present invention is the reflected light generated by the light beam irradiating the liquid on the solid surface, so the detection result will not be affected by the shape, roughness, color, material and other factors.

Although the present invention is disclosed above with the aforementioned embodiments, these embodiments are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, all changes and modifications are within the scope of patent protection of the present invention. For the scope of protection defined by the present invention, please refer to the appended scope of patent application.

1 Solid surface wettability detection system 2 Substances to be detected 21 Solid Surface 3 Liquid film 10 Spray device 110 Liquid storage tank 120 Spray head 130 pump 20 Lighting device 210 Light-emitting components 211 Beam 212 reflected light 220 beam expansion unit 30 Light detection element 40 Analyzer 50 lens A Irradiated area D direction N Normal P1 First position P2 Second position S1~S6 Steps θ1, θ2 included angle a the diameter of the beam d mean diameter of liquid droplets formed on a solid surface

FIG. 1 is a schematic diagram of a detection system used in a method for detecting wettability of a solid surface according to an embodiment of the present invention. FIG. 2 is a schematic diagram of detection of a substance to be detected by the solid surface wettability detection system in FIG. 1 . FIG. 3 is a schematic flowchart of a method for detecting wettability of a solid surface according to an embodiment of the present invention. FIG. 4 is a schematic diagram of the principle of detection of a substance to be detected by the solid surface wettability detection system in FIG. 1 . FIG. 5 is a schematic diagram of the relationship between the reference detection signal and the contact angle. FIG. 6 is a schematic diagram of contact angle relationship curves of multiple signals. Figure 7 is a schematic diagram of surface wettability distribution.

1 Solid surface wettability detection system 10 Spray device 110 Liquid storage tank 120 Spray head 130 pump 20 Lighting device 210 Light-emitting components 220 beam expansion unit 230 Polarizing unit 30 Light detection element 40 Analyzer 50 lens

Claims (10)

A method for detecting the wettability of a solid surface, comprising: spraying a liquid on a solid surface of an object to be detected; sending a light beam toward the solid surface of the object to be detected, and the light beam is reflected by the liquid on the solid surface to generate A reflected light; using a light detection element to receive the reflected light, and output a detection signal related to the wettability of the solid surface according to the reflected light; according to the type of the liquid and the material of the object to be detected, from a data Selecting a corresponding signal contact angle relationship from the library; and comparing the detection signal with the signal contact angle relationship to obtain the contact angle of the liquid on the solid surface. The method for detecting wettability of a solid surface according to claim 1, wherein the incident angle of the light beam on the solid surface is less than 90 degrees. The method for detecting wettability of a solid surface according to Claim 1, wherein the incident angle of the light beam on the solid surface is 30.0° to 85.0°. The method for detecting wettability of a solid surface as described in Claim 1, wherein the signal contact angle relationship is related to a plurality of reference detection signals in the database and the contact angle of the liquid on the solid surface corresponding to each of the reference detection signals. The method for detecting wettability of a solid surface as described in claim 1, further comprising: the light beam scans the solid surface, so that the light detection element outputs a plurality of detection signals corresponding to a plurality of positions on the solid surface; and according to the A surface wettability detection result is obtained from a plurality of detection signals, and a surface wettability distribution map is generated from the surface wettability detection result. The method for detecting wettability of a solid surface as claimed in claim 1, wherein when the light beam irradiates the solid surface, the liquid covers the solid surface. The method for detecting the wettability of a solid surface as described in claim 1, wherein the detection signal is a voltage value. The method for detecting wettability of a solid surface as described in Claim 1, wherein the diameter of the light beam is a, the average diameter of the liquid droplets formed by the liquid on the solid surface is d, and the following conditions are met: d/a > 0.25. The method for detecting wettability of a solid surface as described in Claim 1, wherein the type of the liquid is pure water, and the material of the object to be detected is ethylene-vinyl acetate copolymer, polyurethane, rubber, glass or silicon. The method for detecting the wettability of a solid surface as described in Claim 1, further comprising: using a solid surface wettability detection system, the solid surface wettability detection system comprising: a spraying device configured to spray the liquid on the object to be detected The solid surface; a light-emitting device arranged to emit the light beam toward the solid surface; and the light detection element; wherein the light detection element and the light-emitting device are respectively arranged on opposite sides of the solid surface, and the light The detection element and the light emitting device have the same included angle with respect to the normal line of the solid surface.

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