CN108732066A - A kind of Contact-angle measurement system - Google Patents
A kind of Contact-angle measurement system Download PDFInfo
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- CN108732066A CN108732066A CN201710280609.2A CN201710280609A CN108732066A CN 108732066 A CN108732066 A CN 108732066A CN 201710280609 A CN201710280609 A CN 201710280609A CN 108732066 A CN108732066 A CN 108732066A
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- light
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- light source
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
- G01N2013/0208—Investigating surface tension of liquids by measuring contact angle
Abstract
A kind of Contact-angle measurement system and its measurement method of the present invention, and in particular to a kind of contact angle for measuring liquid versus solid, the i.e. measurement method of the instrument of the wellability of liquid versus solid and this instrument.The Contact-angle measurement system and its measurement method include background light source, sample stage, Liquid sample introduction module, image-forming module and image analysis software module composition, and high-acruracy survey liquid versus solid boundary and contact angle are obtained by the mean place on the imaging measurement liquid versus solid boundary under different backlighting modes.Influence this invention reduces white light dispersion phenomenon, white light diffraction, environment stray light to the imaging precision of Contact-angle measurement.
Description
Technical field
The present invention relates to a kind of Contact-angle measurement system and its measurement methods, and in particular to one kind is for measuring liquid to solid
The contact angle of body, the i.e. measurement method of the instrument of the wellability of liquid versus solid and this instrument.
Background technology
Contact angle measurement is mainly used for measuring the contact angle of liquid versus solid, the i.e. wellability of liquid versus solid.The instrument
Device can measure contact angle of the various liquid to a variety of materials.The instrument is to oil, printing and dyeing, medicine, spraying, the section of the industries such as ore dressing
Grinding production has very important effect.
Contact angle measurement is generally by background light source, sample stage, Liquid sample introduction module, image-forming module and image analysis software
Module composition.Wherein background light source generally uses the monochromatic cold light LED backlight light source of brightness-adjustable, image-forming module one
As use standard charge coupler video camera and the micro- lens head of continuous zoom.Imaging precision, image processing algorithm are contact angles
The important determinant of measuring system precision.With the development of the measurement demand of the contact angle of miniature scale liquid versus solid, lead to
It crosses 1000 times -1500 times of optical microphotograph camera lens of amplification and accurately measures the contact angle of liquid versus solid under miniature scale and need higher
Measurement accuracy.Under high-acruracy survey standard, the intensity of background light source, wavelength influence the imaging precision of sample very much.
With the variation that light source selects, influence of the imaging system to image detection accuracy is different.
In traditional contact angle measurement, under white light source backlighting modes, the white light source that is not blocked by drop
Light is directly over continuous zoom microlens and is imaged in standard charge coupler video camera；The light of the white light source blocked by drop
It then needs to be imaged in standard charge coupler video camera using continuous zoom microlens after tested drop refraction.It is first
Refractive index first due to the light of different wave length in fluid to be measured is different, to be tested the light for the different wave length that drop reflects in electricity
The image space of lotus coupler video camera is different, and thus there are sides at the liquid drop boundary that is imaged in charge-coupled device video camera
Boundary's fuzzy region.This dispersion phenomenon affects the imaging precision of high-precision Contact-angle measurement, especially influences the micron order of magnitude
The imaging precision of the surface of solids fluid to be measured sample of precision.Secondly white light passes through drop side under white light source backlighting modes
Edge generates white light diffraction, since the wavelength of the polychromatic light that white light is combined by various visible lights, each light is different from, so
The width of fringe of diffraction is also different, and it is closeer that interval is generated in standard charge coupler video camera by continuous zoom microlens
Colored diffraction fringe so that the imaging in charge-coupled device video camera loses clearly profile.In addition, environment stray light is tested
The scattering light that is generated on drop, reflected light, have also further obscured the liquid drop boundary being imaged in charge-coupled device video camera.
Thus, existing Contact-angle measurement system is improved, the factor of above-mentioned obscurity boundary is eliminated, realizes that high-precision contact angle is surveyed
Amount, the contact angle high-acruracy survey of liquid versus solid has the meaning of certain scientific research, production especially under miniature scale.
Invention content
In view of the deficiencies of the prior art, the present invention is intended to provide a kind of passing through improved back light, image-forming module and figure
As the Contact-angle measurement system and its measurement method of analysis software module.An object of the present invention is exactly science, accurately
The imaging for obtaining liquid versus solid accurately realizes Contact-angle measurement, especially accurately obtains micron number order of magnitude precision
Surface of solids fluid to be measured sample imaging and corresponding Contact-angle measurement.
To achieve the goals above, the present invention adopts the following technical scheme that：A kind of Contact-angle measurement system and its measurement side
Method, the Contact-angle measurement system include background light source, sample stage, Liquid sample introduction module, image-forming module and image analysis software
Module composition.
The background light source provides complex light background light source and monochromatic light background for high-precision Contact-angle measurement system imaging
Light source, the monochromatic light background light source be by visible red optical band LED light lamp, infrared band LED light lamp, can
The compositions such as light-exposed green band LED light lamp, visible blue wave band LED；
The image-forming module is that the micro- lens head of continuous zoom and the video camera of infrared photosensitive enhancing are constituted.
The sample stage is sample stage described in Conventional contact angle measuring instrument, is known together for industry.
The Liquid sample introduction module is Liquid sample introduction module described in Conventional contact angle measuring instrument, is known together for industry.
Described image analysis software module matches with above-mentioned background light source, sample stage, Liquid sample introduction module, image-forming module
It closes, science, the imaging for accurately obtaining liquid versus solid, and accurately realizes Contact-angle measurement.
The measurement method of Contact-angle measurement system of the present invention is：
Step A, it is instiled in sample stage by Liquid sample introduction module and is tested drop.
Step B, by background light source, in turn to tested drop provide white light back lighting, infrared band back lighting, can
Light-exposed feux rouges back lighting, the back lighting of visible light green light, visible light blue illumination.
Step C, under five kinds of backlighting modes described in step B, tested drop exists by continuous zoom microlens
Video camera is imaged respectively.
Step D, image analysis software module based on the imaging under five kinds of backlighting modes to carrying out image procossing, respectively
Obtain the imaging measurement liquid versus solid boundary under five kinds of backlighting modes.
Step E, the white light back lighting that obtains step D, the back lighting of visible light feux rouges, visible light green light backlight are shone
Measurement liquid versus solid boundary in four kinds of imagings bright, under visible light blue illumination is overlapped, with the survey in four kinds of imagings
Quantity of fluid is to the high-precision boundary that is obtained carried out by solid boundaries mean place.The theoretical foundation of this step is visible light and close
Under the conditions of infrared spectrum, wavelength is longer, and refractive index is bigger, it is known that white light backlighting modes are because it is polychromatic light, in drop
While there are dispersion phenomenons, and then shone relative to infrared band back lighting, the back lighting of visible light feux rouges, visible light green light backlight
Liquid drop boundary Relative Fuzzy that is bright, being imaged in video camera under visible light blue illumination pattern；Equally, according in visible light and closely
Under the conditions of infrared spectrum, the bigger principle of the longer refractive index of wavelength, infrared band back lighting, the back lighting of visible light feux rouges,
Liquid drop boundary is gradually received in corresponding four kinds of imagings in video camera under the back lighting of visible light green light, visible light blue illumination pattern
Hold together.And white light generates white light diffraction by drop edge under white light source backlighting modes, since white light is from various
The wavelength of polychromatic light made of photoreactivation, each light is different from, so the width of fringe of diffraction is also different, by continuous zoom
Microlens generate in video camera is spaced closeer colored diffraction fringe, and green in the back lighting of visible light feux rouges, visible light
Liquid drop boundary generates diffraction fringe interval in corresponding three kinds of imagings in video camera under light back lighting, visible light blue illumination pattern
It is larger.It is right in video camera wherein under the back lighting of visible light feux rouges, the back lighting of visible light green light, visible light blue illumination pattern
Answer liquid drop boundary in three kinds of imagings, it should be located at the measurement liquid versus solid boundary in the imaging under white light back lighting
Outer, centre and interior edge.So white light back lighting, the back lighting of visible light feux rouges, the back lighting of visible light green light, visible light
The measurement liquid versus solid boundary in four kinds of imagings under blue illumination is overlapped, with the measurement liquid in four kinds of imagings to solid
The high-precision boundary obtained carried out by the mean place of body boundary.
Step F, it is measured what step E was obtained under the infrared band back lighting that liquid versus solid boundary is obtained with step D
Imaging in measurement liquid versus solid boundary carry out images match, reduce environment stray light and be tested the scattering that generates on drop
Light, reflected light are to the liquid drop boundary fogging action that is imaged in video camera.The theory of this step be based on be in Contact-angle measurement, by
Stray light in test environment is visible light, the scattering that the stray visible light in these test environments generates on tested drop
Light, reflected light generate speck, noise and fuzzy boundary in the imaging of video camera.And under infrared band back lighting, not
Continuous zoom microlens are directly over by the light for the infrared light supply that drop blocks in the video camera of infrared photosensitive enhancing to generate
The image of infrared photosensitive enhancing；Stray visible light in test environment is micro- using continuous zoom after tested drop reflection
Camera lens is imaged opposite reduction, thus the image quality phase under the infrared band back lighting of step D acquisitions in standard camera
It is relatively clear that liquid versus solid boundary is measured to improving, in the imaging under the infrared band back lighting that step D is obtained.With step
Liquid versus solid boundary is measured in imaging under the infrared band back lighting that D is obtained as template and the measurement for obtaining step E
Liquid versus solid boundary carries out images match, can reduce environment stray light and be tested the scattering light generated on drop, reflected light to taking the photograph
The liquid drop boundary fogging action being imaged in camera.
The present invention includes at least following advantageous effect：
This invention reduces white light dispersion phenomenons under white light backlighting modes to the shadow of the imaging precision of Contact-angle measurement
It rings；This invention reduces under white light source backlighting modes white light by drop edge generate white light diffraction to Contact-angle measurement
Imaging precision influence；This invention reduces environment stray lights to be tested the scattering light generated on drop, reflected light to contact angle
The influence of the imaging precision of measurement.
Description of the drawings
Fig. 1 is the primary structure schematic diagram of Contact-angle measurement system of the present invention.Wherein 1 is fluid to be measured, and 2 be the back of the body
The bias light that scape light source is sent out to fluid to be measured.
Fig. 2 is the front view of the background light source of Contact-angle measurement system of the present invention.Wherein 1 is two pole of red light-emitting
Line sections, 2 be green light LED line segment, and 3 be equal tabula rasa, and 4 be infrared light-emitting diode line segment, and 5 be two pole of blue light emitting
Line sections
Fig. 3 is the left view of the background light source of Contact-angle measurement system of the present invention.Wherein 1 is two pole of red light-emitting
Line sections, 2 be equal tabula rasa, and 3 be blue light-emitting diode line segment, and 4 be infrared light-emitting diode line segment, and 5 be two pole of white-light emitting
Pipe matrix.
Specific implementation mode
With reference to embodiment and attached drawing, the present invention is described in further detail, to enable those skilled in the art's reference
Specification word can be implemented according to this.
It should be noted that experimental method described in following embodiments is unless otherwise specified conventional method, institute
Reagent and material are stated, unless otherwise specified, is commercially obtained；In the description of the present invention, term " transverse direction ", " vertical
To ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", the instructions such as "outside" side
Position or position relationship are to be based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description of the present invention and simplification of the description,
It is not instruction or implies that signified device or element must have a particular orientation, with specific azimuth configuration and operation, because
This is not considered as limiting the invention.
Example：
As shown in Figure 1, a kind of Contact-angle measurement system of present invention offer and its training method example, including：
A kind of Contact-angle measurement system, the system include background light source, sample stage, Liquid sample introduction module, image-forming module and
Image analysis software module composition.
As shown in Fig. 2, the background light source is placed between sample stage, image-forming module, the background light source includes one piece of side
A length of 5 centimetres of rectangle uniform light board；It is 4 centimetres to install the overall length that 8 red light-emitting diodes are constituted in the upper edge of uniform light board
The power of light-emitting diodes line sections, every red light-emitting diode is 0.12 watt；8 infraluminescences are installed in the lower edge of uniform light board
The power of the light-emitting diodes line sections that the overall length that diode is constituted is 4 centimetres, every infrared light emitting diodes is 0.12 watt；?
The light-emitting diodes line sections that the left overall length constituted along 8 blue light-emitting diodes of installation of uniform light board is 4 centimetres, every blue light hair
The power of optical diode is 0.12 watt；It it is 4 centimetres in the right overall length constituted along 8 green light LEDs of installation of uniform light board
The power of light-emitting diodes line sections, every green light LED is 0.12 watt；
As shown in figure 3, it is 4 centimetres of light-emitting diodes to install the length of side that 16 white light emitting diodes are constituted behind in uniform light board
The power of pipe matrix, every white light emitting diode is 0.06 watt.
The sample stage is the three-dimensional sample platform that uses in general Contact-angle measurement, about operable, control,
Front and back equal directions movement.Realize micro-sampling and upper and lower, the accurate movement in left and right.
Liquid sample introduction module is that microsyringe is used in general Contact-angle measurement, adjusts the amount of drop, makes in syringe needle
Drop is formed, turning knob makes workbench move up, and allows specimen surface and drop contact, then moves down workbench, can be stayed on sample
Lower drop.
The image-forming module is and to be mounted with that 1000 times of zoom continuous zooms are aobvious with infrared photosensitive enhancing digital camera
Micro mirror camera lens.
Image analysis software module is a microcomputer for being mounted with image analysis software, the image analysis software mould
Block obtains the picture signal that is obtained of image-forming module by the communications cable, and by computer program carry out image procossing, analysis,
It measures and contact angle calculates.
The measurement method of Contact-angle measurement system of the present invention is：
Step A, it is instiled in sample stage by Liquid sample introduction module and is tested drop.
Step B, it individually lights white light emitting diode matrix 1 second, then extinguishes；Individually light infrared band luminous two
Pole pipe line segment, then extinguishes；Visible red light-emitting diode line segment individually is lighted, is then extinguished；It is green individually to light visible light
Light-emitting diode line segment, then extinguishes；Visible light blue light-emitting diode line segment individually is lighted, is then extinguished.
Step C, white light emitting diode matrix is individually lighted during 1 second described in step B, is tested drop by connecting
Continuous zoom microlens are imaged in standard charge coupler video camera, which is named as 1；Independent point described in step B
Azarin wave section light-emitting diodes line sections are tested drop and are coupled in standard charge by continuous zoom microlens during 1 second
It is imaged in device video camera, which is named as 2；Individually visible red light-emitting diode line segment is lighted described in step B 1 second
During clock, tested drop is imaged by continuous zoom microlens in standard charge coupler video camera, which is named as picture
3；Visible light green light LED line segment is individually lighted during 1 second described in step B, is tested drop and is passed through continuous zoom
Microlens are imaged in standard charge coupler video camera, which is named as 4；Individually lighting described in step B is visible
Light blue light-emitting diode line segment during 1 second, take the photograph by continuous zoom microlens in standard charge coupler by tested drop
It is imaged in camera, which is named as 5；
Step D, image analysis software module is corresponded to respectively to carrying out image procossings as 1, as 2, as 3, as 4, as 5
Measurement liquid versus solid boundary 1, obtain respectively it is corresponding measure liquid versus solid boundary 2, obtain corresponding survey respectively
Quantity of fluid to the boundary 3 of solid, obtain the corresponding boundary 4 for measuring liquid versus solid respectively, obtain corresponding measurement liquid respectively
Boundary 5 of the body to solid.
Step E, boundary 1 that step D is obtained, boundary 3, boundary 4, boundary 5 are overlapped, with boundary 1, boundary 3, boundary
4, the high-precision boundary obtained carried out by the mean place on boundary 5, is named as boundary 6.The theoretical foundation of this step is visible light
And under the conditions of near infrared spectrum, wavelength is longer, and refractive index is bigger, it is known that white light backlighting modes because its be polychromatic light, to
On drop side, there are dispersion phenomenons, and then relative to infrared band back lighting, the back lighting of visible light feux rouges, visible light green light
The liquid drop boundary Relative Fuzzy being imaged in charge-coupled device video camera under back lighting, visible light blue illumination pattern；Equally, root
According under the conditions of visible light and near infrared spectrum, the longer refractive index of wavelength bigger principle is infrared band back lighting, visible
It is corresponding in charge-coupled device video camera under the back lighting of light feux rouges, the back lighting of visible light green light, visible light blue illumination pattern
Liquid drop boundary gradually collapses in four kinds of imagings.And white light generates white light by drop edge under white light source backlighting modes
Diffraction, since the wavelength of the polychromatic light that white light is combined by various visible lights, each light is different from, so the striped of diffraction
Width is also different, is generated in standard charge coupler video camera by continuous zoom microlens and is spaced closeer colored diffraction
Striped, and the charge-coupled device under the back lighting of visible light feux rouges, the back lighting of visible light green light, visible light blue illumination pattern
Liquid drop boundary generation diffraction fringe interval is larger in corresponding three kinds of imagings in video camera.Wherein the back lighting of visible light feux rouges, can
Drop side in three kinds of imagings is corresponded under light-exposed green light back lighting, visible light blue illumination pattern in charge-coupled device video camera
Boundary, it should be located at outer, centre and the interior edge for measuring liquid versus solid boundary in the imaging under white light back lighting.Institute
With four kinds under white light back lighting, the back lighting of visible light feux rouges, the back lighting of visible light green light, visible light blue illumination at
Measurement liquid versus solid boundary as in is overlapped, with carried out by the measurement liquid versus solid boundary mean place in four kinds of imagings
The high-precision boundary of acquisition.
Step F, the boundary 6 for obtaining step E carries out images match with the boundary 2 that step D is obtained, and further decreases environment
Stray light is tested the scattering light generated on drop, reflected light to the fogging action on boundary 6.The theory of this step is based on being to contact
In angular measurement, since the stray light in test environment is visible light, the stray visible light in these test environments is in tested drop
The scattering light of upper generation, reflected light generate speck, noise and fuzzy boundary in the imaging of charge-coupled device video camera.And
Under infrared band back lighting, continuous zoom microlens are not directly in infrared sense by the light for the infrared light supply that drop blocks
The image of infrared photosensitive enhancing is generated in the charge-coupled device video camera of light enhancing；Stray visible light in test environment passes through quilt
It surveys and is imaged opposite reduction after drop reflection in standard charge coupler video camera using continuous zoom microlens, thus walk
The opposite raising of image quality under the infrared band back lighting that rapid D is obtained, under the infrared band back lighting that step D is obtained
It is relatively clear that liquid versus solid boundary is measured in imaging.It is measured in imaging under the infrared band back lighting obtained with step D
Liquid versus solid boundary is that template carries out images match with the measurement liquid versus solid boundary for obtaining step E, can reduce environment
Stray light is tested the scattering light generated on drop, reflected light to the fuzzy work of the liquid drop boundary being imaged in charge-coupled device video camera
With.
Claims (6)
1. Contact-angle measurement system and its measurement method, it is characterised in that：Complex light background light source and monochromatic light bias light are provided
Source, the high-precision obtained by the mean place on the imaging measurement liquid versus solid boundary under different backlighting modes, which is imaged, to be surveyed
Quantity of fluid is to solid boundaries.
2. Contact-angle measurement system according to claim 1, it is characterised in that：The Contact-angle measurement system includes bias light
Source, sample stage, Liquid sample introduction module, image-forming module and image analysis software module composition.
3. background light source according to claim 2, it is characterised in that：The background light source includes complex light background light source and list
Coloured light background light source, the monochromatic light background light source are by visible red optical band LED light lamp, infrared band luminous two
One or more of pole pipe lamp, visible light green band LED light lamp, visible blue wave band LED are constituted.
4. image-forming module includes but is not limited to the micro- lens head of continuous zoom and infrared photosensitive enhancing according to claim 2
Charge-coupled device video camera etc..
5. according to claim 2 image analysis software module including but not limited to have will be under different background light conditions
Liquid versus solid boundary will be measured to be overlapped, to measure the high-precision boundary obtained carried out by the mean place of liquid versus solid boundary
Function.
6. image analysis software module including but not limited to has background light source item outside Different Red according to claim 2
It will measure under part and be obtained carried out by liquid versus solid boundary and measurement liquid versus solid boundary mean place under different background light conditions
Boundary carry out images match, reduce environment stray light be tested drop on generate scattering light, reflected light in video camera at
The function of the liquid drop boundary fogging action of picture.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324070A (en) * | 2021-12-10 | 2022-04-12 | 国网内蒙古东部电力有限公司电力科学研究院 | Outdoor detection method, recording medium and system for surface hydrophobicity of high-voltage bushing umbrella skirt |
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