CN104359429B - Contact area measurement system based on image measuring technique - Google Patents
Contact area measurement system based on image measuring technique Download PDFInfo
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- CN104359429B CN104359429B CN201410743752.7A CN201410743752A CN104359429B CN 104359429 B CN104359429 B CN 104359429B CN 201410743752 A CN201410743752 A CN 201410743752A CN 104359429 B CN104359429 B CN 104359429B
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Abstract
The invention discloses a contact area measurement method based on an image measuring technique. The method comprises the following steps: adjusting a light ray range and scattering light rays after a light source provides the light rays, thereby providing a uniform light field for contact bodies; loading the contact bodies so as to form a contact region; photographing a contact body which is loaded under a uniform light field by a camera, and collecting images of contact parts; and analyzing the images of the contact parts for boundary recognition, determining the contact width, and calculating the contact area among the contact bodies. The invention also discloses a contact area measurement system based on the image measuring technique, and the system is matched with the contact bodies and is used for measuring the contact area among the contact bodies. The system comprises a backlight module, an image collecting module and a contact area recognition module. The method and the system have the advantages of noncontact, high precision, continuity, capability of performing high-temperature environment measurement and the like, and can be used for automatically measuring the contact area under various working conditions.
Description
Technical field
The application is related to Structural Design and image measurement field, specifically, is to be related to one kind to be based on image measurement
The contact area measuring system of technology.
Background technology
Contact is very common in engineer applied, engagement between such as two gears, the roll rolled plate of rolling mill
The rolling on rail of process, wheel and bridge roll contact of seat etc..
The contact form of two objects is divided into contact and a linear contact lay, and the former is contacted with interplanar as spheroid, Hou Zheru
Contact between cylinder and plane, two kinds of contact models are as shown in Figure 1.In order to study the mechanical behavior of contact structures, for example
The contact strength of measurement contact, researcher needs to measure the contact area between contact.Because contact area is to be blocked
Get up and cannot directly observe, thus the measurement of contact area becomes very difficult.
The development course of measurement contact area method is indentation method and draws after two stages, the representative method of first stage
Trace method, this kind of method is passed through to observe the vestige measurement contact area that contact stays in contact process, specifically in two articles
Contact is unloaded after loading, by observing and measuring the dimensioning of the impression being remained by pressure object and cut because of compressive deformation
Very little come calculating contact area.Such method has 2 points of obvious defects：First, indentation method is unloaded because continuously adding with scarification
The experiment method carrying causes continuously to measure；Second, its Measurement Resolution is very low, when contact area is smaller, impression with
Cut does not often observe.
In order to solve the defect of above two method, measurement contact area method is developed to second stage, and it represents is pressure
Power paper method and piezoelectric membrane method, this kind of method places sensor between two contacts, and the contact area of contact object is turned
It is changed to other information to measure.Pressure-sensitive paper method is that (a piece of inside is full of dyeing agent capsules, a piece of attached by two panels pressure-sensitive paper
Have developer) it is placed between contact, when object contact is pressurized, coloring agent capsules break, there iing a lamination of developer
Li Zhishang contact site branch shows for redness, carrys out calculating contact area finally by measurement red area area.Piezoelectric membrane method is
Put into electronic sensor or sensitive grid between two contact objects, contact area can produce electric signal when object contact is pressurized, leads to
Cross the position that analysis electric signal produces just to measure and obtain contact area.The method that this class measures contact area solves pressure
The problem that trace method and scarification can not continuously measure, and certainty of measurement is greatly improved.But this kind of new method there is also certainly
The problem of body：First, pressure-sensitive paper and piezoelectric membrane cannot use in the extreme experimental situation such as high temperature；Second, in contact area
Arrangement sensor information is possible to change the property at interface, thus changing the local mechanical property of contact area, impact experiment knot
The authenticity of fruit.From this, existing contact area measuring method or measuring environment requirement are higher at present, or measurement essence
Degree poor it is difficult to meet the measurement demand of various contacts area.
Content of the invention
The present invention proposes a kind of contact area method for continuous measuring that disclosure satisfy that and use under varying environment, designs simultaneously
And achieve corresponding measuring system.The method is based on image measurement technology, by gathering the image of contact site and it being entered
Row analysis is obtaining contact area it is achieved that continuous high-acruracy survey.The measuring system built based on the method is simple to operate,
Low consumption, data processing can automatically complete.Cannot expire present in technology for existing measurement contact area and method
Measurement under sufficient hot environment, cannot Continuous Observation, impact contact mechanical property itself, precision high the shortcomings of, the present invention
Propose a kind of contact area method for continuous measuring that disclosure satisfy that and use under varying environment, provide corresponding measurement system simultaneously
System.
The invention provides a kind of contact area measuring method based on image measurement technology, the method includes following step
Suddenly：
After light source provides light, light is simultaneously scattered by adjustment light range, provides uniform light field for contact；
Load contact, form contact area；
Using camera, the contact being in stand under load under uniform light field is shot, collection contact site image；
Analyze described contact site image, carry out Boundary Recognition, determine contact width and calculate the contact between contact
Area.
Preferably, after described light source provides light, light is simultaneously scattered by adjustment light range, provides uniform light for contact
, further for：After described light source provides light, using mobile aperture adjustment range of exposures, using white curtain, light is scattered, be
Contact provides uniform light field.
Preferably, described analysis described contact site image, carries out Boundary Recognition, determines between contact width and contact
Contact area, further for：
When the contact that contact is formed with cube for spheroid, contact area is circle, and the contact width of determination is
The diameter d of contact area, contact area is equal to π × (d/2)2；
When the contact that contact is formed with cube for cylinder, contact area is rectangle, and contact area is equal to
The contact width determining is multiplied by cylindrical length.
The present invention also provides a kind of contact area measuring system based on image measurement technology, and this system and contact match
Close, for measuring the contact area between contact, this system includes：Backlight module, image capture module and contact area identification
Module, wherein,
Described backlight module, is coupled with the described body phase that contacts, for providing uniform light field for described contact；
Described contact, is coupled with described backlight module and described image acquisition module phase, respectively in described backlight
Form contact area in the light field of module, and contact site image is collected by described image acquisition module；
Described image acquisition module, is coupled with described contact and described contact area identification module phase respectively, is used for adopting
Collect the contact site image of contact and send to described contact area identification module；
Described contact area identification module, is coupled with described image acquisition module phase, for receiving described image collection mould
The contact site image that block sends carries out Boundary Recognition and obtains contact width and calculate the contact area between contact.
Preferably, described backlight module, including：Light source, mobile aperture and white curtain, wherein,
Described light source, is coupled with described mobile aperture phase, for providing light；
Described mobile aperture, is mutually coupled with described light source and described white curtain, respectively for adjusting the irradiated region of described light source
Domain；
Described white curtain, is coupled with described mobile aperture and the described body phase that contacts, respectively for being scattered described light
Send to described contact, this white curtain also serves as white background simultaneously.
Preferably, be further also provided with camera in described image acquisition module, this camera respectively with described contact and institute
State contact area identification module phase to couple, the contact site image for collecting contact sends to the identification of described contact area
Module.
Preferably, described contact, the contact being formed with cube for cylinder further；Or further be spheroid with
The contact that cube is formed.
Preferably, described contact, the contact being formed with graphite square brick for graphite cylinder further；Or further for stone
The contact that tampon is formed with graphite square brick.
Compared with prior art, the contact area measuring method based on image measurement technology described herein and system,
The method and system have the advantages that noncontact, in high precision, continuously and can meet hot environment and measure, and can automate completes
The measurement of contact area under various operating modes, has reached following effect：
1) present invention provides the contact area measuring method based on image measurement technology and system, can be by measuring system
Come with object being measured isolation, so solve the problems, such as that the extreme conditions such as high temperature are lower and cannot measure contact area；
2) the contact area measuring method based on image measurement technology of present invention offer and system are it is achieved that be continuously shot
Metering system, also achieve the Real-time Collection in loading procedure simultaneously；
3) present invention provides the contact area measuring method based on image measurement technology and system, certainty of measurement can reach
Sub-pix rank.
Brief description
Accompanying drawing described herein is used for providing further understanding of the present application, constitutes the part of the application, this Shen
Schematic description and description please is used for explaining the application, does not constitute the improper restriction to the application.In the accompanying drawings：
Fig. 1 is point contact and linear contact lay schematic diagram；
The contact area measuring method schematic flow sheet based on image measurement technology that Fig. 2 provides for the present invention；
The contact area measuring system structural representation based on image measurement technology that Fig. 3 provides for the present invention；
Fig. 4 is graphite linear contact lay calibration maps piece；
Fig. 5 tests collection image and to the contact profile after its Boundary Recognition for graphite linear contact lay；
Fig. 6 is graphite linear contact lay half-breadth with load change curve；
Fig. 7 is that under hot environment, grey spots contact experiment gathers image and to contact profile after its Boundary Recognition；
Fig. 8 is for grey spots contact radius under hot environment with load change curve.
Specific embodiment
To censure specific components as employed some vocabulary in the middle of specification and claim.Those skilled in the art should
It is understood that hardware manufacturer may call same assembly with different nouns.This specification and claims are not with name
The difference claiming is used as distinguishing the mode of assembly, but difference functionally is used as the criterion distinguished with assembly.As logical
In the middle of piece specification and claim, mentioned "comprising" is an open language, therefore should be construed to " comprise but do not limit
In "." substantially " refer in receivable error range, those skilled in the art can solve described in the range of certain error
Technical problem, basically reaches described technique effect.Additionally, " coupling " word here comprises any directly and indirectly electric property coupling
Means.Therefore, if a first device is coupled to a second device described in literary composition, representing described first device can direct electrical coupling
It is connected to described second device, or be indirectly electrically coupled to described second device by other devices or the means that couple.Specification
Subsequent descriptions are to implement the better embodiment of the application, and so described description is for the purpose of the rule that the application is described,
It is not limited to scope of the present application.The protection domain of the application ought be defined depending on the defined person of claims.
Below in conjunction with accompanying drawing, the application is described in further detail, but not as the restriction to the application.
Embodiment one：
The present embodiment taking measure the contact area between the cylindrical member that graphite material is made and square brick as a example, to this
Bright specific embodiment is described in detail, and specific embodiment is as follows：
As shown in Figure 3 the present embodiment provides a kind of contact area measuring system based on image measurement technology, this system with
Contact 302 matches, for measuring the contact area between contact, including：Backlight module 301, image capture module 303 and
Contact area identification module 304.
The effect of backlight module 301 is to provide a uniform light field for contact 302, and this module is by light source 3011, shifting
Dynamic aperture 3012, white curtain 3,013 3 part composition.The back side acting on contact 302 of light source 3011 provides light.Mobile light
Circle 3012 is formed using two transportable objects that block, and can reasonably adjust the irradiation area of light source.White curtain 3013
Effect has two, and the first light being intended to project light source 3011 is scattered, and is the figure making shooting the reason light is scattered
In piece, contact profile becomes apparent from, because in measurement process, shooting area needs the light field that light intensity is evenly distributed, right
For the linear light source that similar LED provides, adjustment light source position all cannot meet requirement with light intensity anyway, and
Just this effect is can reach after light is scattered；Second effect is intended to play a kind of effect of white background cloth so that camera
Substantially, profile becomes apparent from the contact area aberration shooting.There are two requirements for white curtain 3013, material character first is distributed not
Uniformly, material character skewness here refers to material non-isotropy, is mingled with impurity in the material forming white curtain
Or uneven agglomerate makes light can scatter when through white curtain, so can meet the requirement scattering light,
Next to that object color is white, can be met it as the requirement of white background cloth.
Contact 302, is mutually coupled with backlight module 301 and image capture module 303, respectively in backlight module 301
Uniform light field in form contact area, and contact site image is collected by image capture module 303.Contact 302 enters one
Walk the contact being formed for cylinder with cube；Or be the contact that spheroid and cube are formed further.In the present embodiment
Contact 302 is the contact that graphite cylinder is formed with graphite square brick, forms linear contact lay between contact.Certainly here not to contact
The form of body 302 make concrete limit, the contact that contact 302 can also be triangular form centrum and plane is formed or
The contact that cylindroid is formed with plane, specifically depending on actual conditions.
Image capture module 303, is mutually coupled with contact 302 and contact area identification module 304 respectively, is used for collecting
The contact site image of contact 302 simultaneously sends to contact area identification module 304.Image capture module 303 in the present embodiment
In be provided with camera 3031 further, further camera 3031 be IPX-16M3-L high resolution camera.Image capture module
303 effect：The contact being in stand under load under uniform light field is continuously shot, obtains digital image information.To contact
Before body 302 is shot, camera and camera lens used in first adjusting module, in order to meet requirement when post processing calculates,
Need to accommodate contact global feature part (part of more than half of such as cylinder or spheroid) among picture.In choosing
After determining shooting area, adjusting focal length, make contact area present clearly as.Because camera 3031 gathers the resolution ratio of picture
Unit is pixel, so need to be demarcated in contact area after Image Adjusting is clear, so that the resolution unit of collection picture is turned
Turn to standard length unit.After Focussing finishes, as far as possible by light on the premise of contact 302 profile integrally can identify
Circle tunes up, and so can increase the light intensity magnitude of white curtain 3013 background, so that contact 302 is become apparent from background gray scale difference,
It is easy to identify.After camera lens adjustment finishes, set collected by camera speed and just during experiment, image can be carried out
Real-time Collection.
Contact area identification module 304, is mutually coupled with image capture module 303, for receiving image capture module 303
The contact site image sending row bound identification of going forward side by side obtains contact width, and calculates the contact area between contact, this enforcement
Contact with cubical for cylinder in example, its contact area is a cuboid, and the contact width recording is multiplied by cylindrical
Length just can calculate contact area.Contact area identification module 304 effect is by the image gathering in image capture module
Carry out Boundary Recognition.In the picture, border represents the terminal of a characteristic area and the starting point of another characteristic area.Border
The internal feature of institute's separation region or attribute are consistent, and the internal feature of zones of different or attribute have larger difference,
Realize exactly using object and background by the difference in certain picture characteristics for Boundary Recognition.This species diversity includes gray scale, face
Color etc..Boundary Recognition is actually the position that detection image characteristic changes.Boundary characteristic in the present invention is image
Gray value, the gray value ratio of the bright side in border is larger, and border opposite side gray value is little, and border is gray value large area
Terminal, another side is the starting point of gray value smaller area.Camera 3031 shooting image is gray level image, and shooting image is read in
The gray value of each pixel in software, can be obtained, contact body portion gray scale is low, and white curtain 3013 gray value is high, border
Both sides gray value difference is very big.After by Boundary Recognition, just can obtain contact profile, " connection " part of profile is just
It is the contact area of contact object, just can obtain the contact area (contact between contact by the contact area width obtaining
Body has upper and lower two, the contact area of contact above and lower contact body actually, carries out side to image
When boundary's identification, will recognise that the profile of overlying contact body and the profile of lower contact body, between two profiles, have one
Overlapping region is to connect together, and this connected component is exactly the contact area of two contacts).
The present embodiment also provides a kind of contact area measuring method based on image measurement technology, as shown in Fig. 2 the method
Comprise the following steps：
Step 201：Light source provides light, and light is simultaneously scattered by adjustment light range, provides uniform light field for contact；
Step 202：Load contact, form contact area；
Step 203：Using camera, the contact being in stand under load under uniform light field is shot, gather contact site bitmap
Picture；
Step 204：Analyze described contact site image, carry out Boundary Recognition, determine contact width, and calculate contact
Between contact area.
The load change curve with loading for the contact half-breadth between contact can also be obtained in step 204.
Step 201, further for：After described light source provides light, using mobile aperture adjustment range of exposures, using white curtain
Light is scattered, provides uniform light field for contact.
Step 203, further for：
Using IPX-16M3-L high resolution camera, the contact being in stand under load under uniform light field is shot, collection connects
Contact portion bit image.
Step 204, further for：
When the contact that contact is formed with cube for spheroid, contact area is circle, and the contact width of determination is
The diameter d of contact area, contact area is equal to π × (d/2)2；
When the contact that contact is formed with cube for cylinder, contact area is rectangle, and contact area is equal to
The contact width determining is multiplied by cylindrical length.The size of the graphite cylinder in the present embodiment is Φ 50 × 60mm, graphite side
The size of brick is 100 × 100 × 60mm.Loading equipemtn is MTS810 material property testing machine.Before the present embodiment, set up first
Light source 3011 in backlight module, mobile aperture 3012, white curtain 3013, in the present embodiment, light source 3011 uses LED, moves
Dynamic aperture 3012 uses low-carbon (LC) bloom to form, and white curtain 3013 is suitable for common A4 blank sheet of paper.Build when backlight module 301 each several part and complete
Set up IPX-16M3-L high resolution camera with tripod outside environmental cabinet afterwards.
After camera erection is finished, enter image capture module 303.Graphite end face is shot clear by adjustment camera focus
Clear, and graduated demarcation paper will be carried to be pasted onto cylinder end face, now shoot pictures and be used for demarcating object plane resolution ratio, graphite
The demarcation picture of contact 302 is as shown in Figure 4.After the completion of shooting, the demarcation paper of stickup is taken, and camera aperture is adjusted to
Greatly.After camera debugging finishes, open testing machine and loaded, loading velocity is 0.1mm/min, open high resolution camera simultaneously
Image capturing system, picking rate be 0.2fps.When load reaches 50KN, stop testing machine simultaneously and load and camera image
Collection.
After the present embodiment IMAQ terminates, the present embodiment acquired image is imported contact area identification module 304,
Using software, contact border in image is identified.The image obtaining after Boundary Recognition, contact profile is shown as
White, and remaining area is shown as black, graphite cylinder border and graphite brick profile intersection point are both contact points, the present embodiment
Collection image and the contact profile after Boundary Recognition is carried out to image as shown in figure 5, the part between two contact points is
Graphite cylinder and the contact width of graphite brick, can obtain the contact area of graphite linear contact lay by the contact width obtaining.Fig. 6
It is the result of variations contacting half-breadth in the continuous loading procedure of graphite contact body obtaining by the present embodiment.
Embodiment two：
The present embodiment to measure the contact area between the spherical component that graphite material in hot environment is made and square brick is
Example, to the present invention, in hot environment, specific embodiment is described in detail.
As shown in Figure 3 the present embodiment provides a kind of contact area measuring system based on image measurement technology, this system with
Contact 302 matches, for measuring the contact area between contact, including：Backlight module 301, image capture module 303 and
Contact area identification module 304.
The effect of backlight module 301 is to provide a uniform light field for contact 302, and this module is by light source 3011, shifting
Dynamic aperture 3012, white curtain 3,013 3 part composition.The back side acting on contact 302 of light source 3011 provides light.Mobile light
Circle 3012 is formed using two transportable objects that block, and can reasonably adjust the irradiation area of light source.White curtain 3013
Effect has two, and the first light being intended to project light source 3011 is scattered, and is the figure making shooting the reason light is scattered
In piece, contact profile becomes apparent from, because in measurement process, shooting area needs the light field that light intensity is evenly distributed, right
For the linear light source that similar LED provides, adjustment light source position all cannot meet requirement with light intensity anyway, and
Just this effect is can reach after light is scattered；Second effect is intended to play a kind of effect of white background cloth so that camera
Substantially, profile becomes apparent from the contact area aberration shooting.Requirement for white curtain 3013 is identical with embodiment one.
Contact 302, is mutually coupled with backlight module 301 and image capture module 303, respectively in backlight module 301
Uniform light field in form contact area, and contact site image is collected by image capture module 303.Contact 302 enters one
Walk the contact being formed with cube for cylinder, or be the contact that spheroid is formed with cube further.In the present embodiment
Contact 302 is the contact that graphite nodule is formed with graphite square brick, forms point contact between contact.Certainly here not to contact
302 form make concrete limit, the contact that contact 302 can also be triangular form centrum and plane is formed or ellipse
The contact that cylinder is formed with plane, specifically depending on actual conditions.
Image capture module 303, is mutually coupled with contact 302 and contact area identification module 304 respectively, is used for collecting
The contact site image of contact 302 simultaneously sends to contact area identification module 304.Image capture module 303 in the present embodiment
In be provided with camera 3031 further, further camera 3031 be IPX-16M3-L high resolution camera.Image capture module
303 effect：The contact being in stand under load under uniform light field is continuously shot, obtains digital image information.To contact
Before body 302 is shot, camera and camera lens used in first adjusting module, in order to meet requirement when post processing calculates,
Need to accommodate contact global feature part (part of more than half of such as cylinder or spheroid) among picture.In choosing
After determining shooting area, adjusting focal length, make contact area present clearly as.Because camera 3031 gathers the resolution ratio of picture
Unit is pixel, so need to be demarcated in contact area after Image Adjusting is clear, so that the resolution unit of collection picture is turned
Turn to standard length unit.After Focussing finishes, as far as possible by light on the premise of contact 302 profile integrally can identify
Circle tunes up, and so can increase the light intensity magnitude of white curtain 3013 background, so that contact 302 is become apparent from background gray scale difference,
It is easy to identify.After camera lens adjustment finishes, set collected by camera speed and just during experiment, image can be carried out
Real-time Collection.
Contact area identification module 304, is mutually coupled with image capture module 303, for receiving image capture module 303
The contact site image sending row bound identification of going forward side by side obtains contact width, and calculates contact area (this enforcement between contact
As contacting with cubical for spheroid in example, contact width is actually the diameter d, π × (d/2) of contact area (circular)2
It is contact area area).Contact area identification module 304 effect is that the image gathering in image capture module is entered row bound
Identification.In the picture, border represents the terminal of a characteristic area and the starting point of another characteristic area, border institute separate zones
The internal feature in domain or attribute are consistent, and the internal feature of zones of different or attribute have larger difference, Boundary Recognition
Exactly using object and background, the difference in certain picture characteristics is realized.This species diversity includes gray scale, color etc..Border
Identification is actually the position that detection image characteristic changes.Camera 3031 shooting image is gray level image, by shooting figure
As reading in software, the gray value of each pixel can be obtained, contact body portion gray scale is low, and white curtain 3013 gray value
Height, boundaries on either side gray value difference is very big.After by Boundary Recognition, just can obtain contact the profile, " company of profile
Logical " it is partly the contact area contacting object, the contact between contact just can be obtained by the contact area width obtaining
(contact has upper and lower two to area, and the contact area of contact above and lower contact body actually, to figure
As, when carrying out Boundary Recognition, will recognise that the profile of overlying contact body and the profile of lower contact body, between two profiles
Having an overlapping region is to connect together, and this connected component is exactly the contact area of two contacts).
The present embodiment also provides a kind of contact area measuring method based on image measurement technology, as shown in Fig. 2 the method
Comprise the following steps：
Step 201：Light source provides light, and light is simultaneously scattered by adjustment light range, provides uniform light field for contact；
Step 202：Load contact, form contact area；
Step 203：Using camera, the contact being in stand under load under uniform light field is shot, gather contact site bitmap
Picture；
Step 204：Analyze described contact site image, carry out Boundary Recognition, determine contact width, then calculate contact
Contact area between body.
The load change curve with loading for the contact half-breadth between contact can also be obtained in step 204.
Step 201, further for：After described light source provides light, using mobile aperture adjustment light range, using white curtain
Light is scattered, provides uniform light field for contact.
Step 203, further for：
Using IPX-16M3-L high resolution camera, the contact being in stand under load under uniform light field is shot, collection connects
Contact portion bit image.
Step 204, further for：
When the contact that contact is formed with cube for spheroid, contact area is circle, and the contact width of determination is
The diameter d of contact area, contact area is equal to π × (d/2)2；
When the contact that contact is formed with cube for cylinder, contact area is rectangle, and contact area is equal to
The contact width determining is multiplied by cylindrical length.
Diameter of graphite ball 40mm in the present embodiment, graphite square brick and loading equipemtn are identical with embodiment one.Heat and set
Standby for MTS8651 environmental cabinet.In order to ensure the quality of shooting image, environmental cabinet observation window uses the ultrawhite stone of resistance to 1600 DEG C of high temperature
English glass.Before measuring, need to set up light source 3011 in backlight module, mobile aperture 3012, white curtain 3013 in environmental cabinet.
In the present embodiment, light source 3011 uses 500 degrees Celsius of high temperature resistant lamps, the low-carbon (LC) bloom that mobile aperture 3012 is then wrapped up by asbestos
Composition, the high temperature resistant paper that white curtain 3013 is then made using ceramic fibre.In environmental cabinet after the completion of light source module each several part is built
Outside tripod sets up IPX-16M3-L high resolution camera.
After camera erection is finished, enter image capture module.Turn on high temperature resistant lamp, preprepared is demarcated thing
Alignd with contact surface in surface, adjustment camera focus will demarcate thing surface shooting clear, now shoot pictures and be used for demarcating thing
Face is differentiated.After the completion of shooting, thing will be demarcated and take out, and camera aperture will be adjusted to maximum.After camera debugging finishes, open environmental cabinet
Heating apparatus, temperature is risen to 200 DEG C.When environmental cabinet temperature stabilization, open testing machine and loaded, loading velocity is
0.1mm/min, opens the image capturing system of high resolution camera simultaneously, and picking rate is 0.2fps.When load reaches 12KN
When, stop testing machine simultaneously and load and camera image collection.
Carry out contact area identification module flow process under the high temperature conditions identical with embodiment one, Fig. 7 is height in the present embodiment
Temperature is tested the image of collection and image is carried out with the contact profile after Boundary Recognition, and Fig. 8 is to be connect by testing the graphite obtaining
The result of variations of contact radius in the continuous loading procedure of contact.
Compared with prior art, the contact area measuring method based on image measurement technology described herein and system,
The method and system have the advantages that noncontact, in high precision, continuously and can meet hot environment and measure, and can automate completes
The measurement of contact area under various operating modes, has reached following effect：
The present invention provide the contact area measuring method based on image measurement technology and system, can by measuring system with
Object being measured isolation is come, and so solves the problems, such as cannot measure contact area under high temperature；The present invention provide based on figure
As contact area measuring method and the system of e measurement technology is it is achieved that the metering system that is continuously shot, also achieve loading simultaneously
During Real-time Collection；The contact area measuring method based on image measurement technology and system that the present invention provides, measurement essence
Degree can reach sub-pix rank.
Described above illustrate and describes some preferred embodiments of the application, but as previously mentioned it should be understood that the application
Be not limited to form disclosed herein, be not to be taken as the exclusion to other embodiment, and can be used for various other combinations,
Modification and environment, and can be in application contemplated scope described herein, by technology or the knowledge of above-mentioned teaching or association area
It is modified.And the change that those skilled in the art are carried out and change without departing from spirit and scope, then all should be in this Shen
Please be in the protection domain of claims.
Claims (3)
1. a kind of contact area measuring system based on image measurement technology, this system with contact mates, for measurement connect
Contact area between contact is it is characterised in that include：Backlight module, image capture module and contact area identification module, its
In,
Described backlight module, is coupled with the described body phase that contacts, for providing uniform light field for described contact；
Described backlight module, including：Light source, mobile aperture and white curtain,
Described light source, is coupled with described mobile aperture phase, for providing light at the back side of described contact,
Described mobile aperture, is formed using two transportable objects that block, is mutually coupled with described white curtain, described for adjusting
The irradiation area of light source,
Described white curtain, for being scattered sending to described contact described light, described white curtain also serves as white background, institute
It is mingled with impurity or uneven agglomerate so that light occurs to dissipate when through described white curtain in the constituent material stating white curtain
Penetrate；
Described contact, is coupled with described backlight module and described image acquisition module phase, respectively in described backlight module
Light field in form contact area, and contact site image is collected by described image acquisition module；
Described image acquisition module, is coupled with described contact and described contact area identification module phase respectively, is used for collecting
The contact site image of contact simultaneously sends to described contact area identification module；
Described contact area identification module, is coupled with described image acquisition module phase, sends out for receiving described image acquisition module
The contact site image sending carries out Boundary Recognition and obtains contact width the contact area calculating between contact, is schemed by acquisition
The gray value of picture, obtains contact profile, and the connected component of profile is the contact area of contact, is obtained by described contact area
To contact width, calculate the contact area between contact by described contact width.
2. the contact area measuring system based on image measurement technology according to claim 1 is it is characterised in that described connect
Contact, the contact being formed with cube for cylinder further；Or be the contact that spheroid and cube are formed further.
3. the contact area measuring system based on image measurement technology according to claim 1 is it is characterised in that described connect
Contact, the contact being formed with graphite square brick for graphite cylinder further；Or further for graphite nodule and the formation of graphite square brick
Contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410743752.7A CN104359429B (en) | 2014-12-08 | 2014-12-08 | Contact area measurement system based on image measuring technique |
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| CN101865679A (en) * | 2010-06-18 | 2010-10-20 | 杭州双树科技有限公司 | Plane area measuring method based on digital image technology |
| CN103445759A (en) * | 2013-09-06 | 2013-12-18 | 重庆大学 | Self-operated measuring unit for reaction of pupil aperture to light based on digital image processing |
| CN103644865A (en) * | 2013-11-08 | 2014-03-19 | 广东出入境检验检疫局检验检疫技术中心 | Plane area measuring method based on digital image analysis |
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| US20060284631A1 (en) * | 2005-05-31 | 2006-12-21 | Hamren Steven L | Imaging test socket, system, and method of testing an image sensor device |
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| CN103445759A (en) * | 2013-09-06 | 2013-12-18 | 重庆大学 | Self-operated measuring unit for reaction of pupil aperture to light based on digital image processing |
| CN103644865A (en) * | 2013-11-08 | 2014-03-19 | 广东出入境检验检疫局检验检疫技术中心 | Plane area measuring method based on digital image analysis |
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