CN209624422U - A kind of concave-convex defect detecting device based on linear array imaging - Google Patents
A kind of concave-convex defect detecting device based on linear array imaging Download PDFInfo
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- CN209624422U CN209624422U CN201920172425.9U CN201920172425U CN209624422U CN 209624422 U CN209624422 U CN 209624422U CN 201920172425 U CN201920172425 U CN 201920172425U CN 209624422 U CN209624422 U CN 209624422U
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Abstract
The utility model relates to a kind of concave-convex defect detecting device based on linear array imaging, which includes line image acquisition device and linear light sources；Line image acquisition device includes line array sensor and imaging len, is arranged above linear light sources, and testee is passed through along fixed-direction by moving below linear light sources；It is to be detected region that the intersection of plane and testee plane of motion where the optical axis of line image acquisition device, which is formed by linear regions,；Linear light sources deviate preset distance along line style light source length direction relative to the plane of movement of testee, and length direction is vertical with testee moving direction, parallel with detected region；Linear light sources irradiate testee towards regional dip is detected；The linear light sources have the reflecting component of illumination in the parallel and vertical direction of concave-convex defect, and linear image collecting device reception reflected light is simultaneously photosensitive, form grey scale change on acquisition image.The utility model solves the problems, such as that direction of motion bumps defect is undetectable.
Description
Technical field
The utility model relates to a kind of defect detecting devices, and in particular to a kind of concave-convex defects detection based on linear array imaging
Device.
Background technique
In general (known in industry), for linear array imaging system, the direction of line array sensor is perpendicular to testee
The direction of motion, linear light sources are parallel to line array sensor direction, in this way when testee moves, linear array imaging system and line style
Light source is opposing stationary, and available image effect uniformly, bright, the testee position that line array sensor acquires in real time is one
Item is parallel to the straight line of line array sensor.
When concave-convex state is presented in defect, i.e., defect is characterized in uneven, changes the normal light of testee
Reflection angle, when defect is threadiness and is parallel to the direction of motion of testee, conventional linear array imaging system is difficult to detect
The concave-convex defect of movement direction of object out.Thin scuffing such as the folding line on printed matter, on band.
The equal vertical irradiation of optical axis of each illumination particle of current linear light sources common on the market is detected region, that is, illuminates
Region is in the underface of linear light sources, as shown in Figure 1.The two dimensional image of uniform illumination can be obtained at this time, it is still, parallel for having
It is recessed since the optical axis of linear light sources is coplanar with concavo-convex cross-section direction for the concave-convex defect of threadiness of the testee direction of motion
Convex surface can not change the reflection angle of chief ray, and reflection light is still by optical lens collection and photosensitive on line array sensor,
Therefore the significant change of light intensity can not be formed on the image, and detection system, which can not collect defect and background, the figure of obvious contrast
Picture be easy to cause missing inspection, this brings very big hidden danger to automatic image detection system.
Utility model content
For the above-mentioned problems in the prior art, the utility model provides a kind of concave-convex defect based on linear array imaging
Detection device, which uses a kind of special line type light source, when special line type light source is radiated at environment same as described above
When testee surface, the high-contrast image of the concave-convex defect of the available movement direction of object of line array sensor, so as to
Solving concave-convex defect can not test problems.
The utility model is achieved through the following technical solutions above-mentioned purpose:
A kind of concave-convex defect detecting device based on linear array imaging, which is characterized in that the detection device includes line illustration
As acquisition device and linear light sources；The line image acquisition device includes line array sensor and imaging len, is arranged in institute
It states above linear light sources, testee is passed through along fixed-direction by moving below the linear light sources；
The intersection of plane and the testee plane of motion where the optical axis of line image acquisition device is formed by
Linear regions are to be detected region；
The linear light sources are predetermined along linear light sources length direction offset relative to the plane of movement of the testee
Distance, and length direction is vertical with the testee moving direction, it is parallel with the detected region；The linear light sources court
The testee is irradiated to the detected regional dip；When having concave-convex defect on the testee, the line style
Light source has the reflecting component of illumination in the parallel and vertical direction of the concave-convex defect, and the line image acquisition device receives
Reflected light is simultaneously photosensitive, forms grey scale change on acquisition image.
Preferably, the tilt angle of plane where the key lighting face of the linear light sources and the testee be 5~
175°。
Preferably, the optical axis of the linear light sources is along the linear light sources length direction and detected regional dip angle
10~80 °.
Preferably, the linear light sources include multiple luminescence units, and multiple luminescence units are long along the linear light sources
Spend that direction is in a row or multiple rows of arrangement.
Preferably, the primary optical axis of all luminescence units is parallel to each other.
Preferably, all luminescence units issue the luminescence unit by the rotation installation of required inclined light shaft angle
Light with pre-determined tilt angle tilt.
Preferably, the luminescence unit primary optical axis is installed vertically downward, is installed optical lens below the luminescence unit additional, is changed
Become the primary optical axis angle for finally irradiating the testee surface.
Preferably, the luminescence unit primary optical axis is installed vertically downward, installs the light of micro-structure below the luminescence unit additional
Film is learned, the primary optical axis angle for finally irradiating the testee surface is changed.
Preferably, when multiple luminescence units are at multiple rows of arrangement, the luminescence unit of front and rear row at staggered arrangement,
Or it is arranged using aligned identical sequence.
Preferably, the linear light sources are illuminated using optical fiber source, and the optical fiber source includes optical fiber luminescent end, outside light source
Shell, transmission fiber and light source output equipment, the optical fiber luminescent end is mounted on the light shell outer cover by light pipe, described to lead
As needed with the installation of pre-determined tilt angle, the optical fiber luminescent end is set light pipe by the transmission fiber and the light source output
Standby to be connected, the light source output equipment provides optical fiber for the optical fiber luminescent end.
The utility model has the beneficial effects that
The structure of the detecting device of the utility model is simple, ingenious in design, passes through special light sources oblique illumination measured object body surface
Face, concave-convex fault location generates strong light intensity variation, to solve the problems, such as that concave-convex defect is undetectable.
Detailed description of the invention
Fig. 1 is that light source vertical irradiation is detected zone state schematic diagram in the prior art；
Fig. 2 is the structural schematic diagram of concave-convex defect detecting device of the utility model based on linear array imaging；
Fig. 3 is that the utility model linear light sources irradiate detected zone state schematic diagram；
Fig. 4 is that linear light sources rotate optical axis mounting structure schematic diagram in the utility model；
Fig. 5 is the preposition optical lens structure schematic diagram of linear light sources in the utility model；
Fig. 6 is the optic film structure schematic diagram of the preposition micro-structure of linear light sources in the utility model；
Fig. 7 is optical fiber source structural schematic diagram in the utility model；
Fig. 8 is that light pipe tilts arrangement schematic diagram in the utility model；
Fig. 9 is that normal image detection device detects concave-convex defect acquired image；
Figure 10 is that concave-convex defect acquired image is detected using the utility model.
Wherein: 1- line image acquisition device, 2- linear light sources, 3- testee, 4- bumps defect, 5- are detected area
Domain, 6- optical fiber luminescent end, 7- light shell outer cover, 8- transmission fiber, 9- optical fiber source coupling head, 10- light source output equipment, 11- light
Source output interface.
Specific embodiment
With reference to the accompanying drawings of the specification and embodiment, specific embodiment of the present utility model work is further retouched in detail
It states.Following embodiment is merely to illustrate the utility model, but is not intended to limit the scope of the present invention.
In the utility model, term " installation ", " connected ", " connecting ", " connection ", " fixation " etc. be shall be understood in a broad sense, example
Such as, it may be a fixed connection, may be a detachable connection, be also possible to be integrally connected, be also possible to be mechanically connected, it can also
To be electrical connection or can be in communication with each other, it is also possible to be directly connected to, is also possible to be indirectly connected with by intermediary, can be
Connection inside two components, is also possible to the interaction relationship of two components.For the ordinary skill people of this field
For member, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
The present embodiment describes a kind of concave-convex defect detecting device based on linear array imaging, and the detection device is by optical imagery
Mechanism and image procossing mechanism are constituted, and optical imagery mechanism acquires image at detection station, image procossing mechanism to image into
Row processing.
As shown in Fig. 2, optical imagery mechanism includes line image acquisition device 1 and linear light sources 2.Line image acquisition dress
1 setting is set above linear light sources 2, testee 3 is passed through along a certain fixed-direction by moving below linear light sources 2.
Line image acquisition device 1 includes line array sensor and imaging len (such as camera lens), and imaging len collects measured object
The reflected light on 3 surface of body is simultaneously photosensitive on line array sensor.Plane and quilt where the scanning optical axis of line image acquisition device 1
3 plane of motion angle of intersection of object is surveyed between 0~180 °, intersection location is that detected region 5 namely line array sensor are adopted
Collect the position of 3 surface image of testee, detected 5 length direction of region is vertical with the direction of motion of testee 3, line illustration
As acquisition device 1 is arranged towards the detected region 5 of testee 3.The linear array of line image acquisition device 1 in the present embodiment
Sensor can be CCD/CMOS line-scan digital camera, colour/black and white line-scan digital camera etc..Linear light sources 2 are the illumination light of testee 3
Source, the mobile irradiation area for passing through linear light sources 2 of testee 3, the length direction of linear light sources 2 are parallel with detected region 5.
Testee 3 is placed on transmission part, is transmitted by transmission part, to guarantee the phase between line array sensor and testee 3
To movement, to obtain the complete image of testee 3, image procossing mechanism carries out processing analysis to image.Testee 3 can
To be transparent, opaque, translucent object, such as printed matter, glass, plastics, metal, non-woven fabrics, paper.Concave-convex defect 4 is
The concave-convex linear discontinuities of moving direction are parallel on testee 3, it is common as scratched.
Particularly, linear light sources 2 use special line type light source comprising multiple luminescence units, it is common to complete to measured object
The illumination of body 3, multiple luminescence units can in a row or multiple rows of arrangement along 2 length direction of linear light sources, when at multiple rows of arrangement, front and back
The luminescence unit of row can also can be used aligned identical sequence and arrange, to increase the light of a certain specific direction at staggered arrangement
By force.
Linear light sources 2 deviate the plane of movement of testee 3 along the length direction that luminescence unit arranges with preset distance, and
Length direction is vertical with the moving direction of testee 3, while linear light sources 2 are towards detected 5 oblique illumination measured object of region
Body 3, the optical axis of each luminescence unit is along 2 length direction of linear light sources and detected region 5 at certain tilt angle, it is preferable that
Tilt angle is 10~80 °, and all luminescence unit optical axises are parallel to each other, the key lighting plane and testee that optical axis is constituted
3 place planes are at certain angle of inclination, and the tilt angle is depending on the design of detection station, generally between 5~175 °, preferably
20~80 ° of ground.As shown in figure 3, the linear light sources 2 are placed in location A, due to the inclined light shaft of special line type light source luminescent unit
Certain angle, therefore its primary illumination zone is immediately below special line type light source, but location of C is moved to, therefore testee 3
Detected region 5 also move to location of C.
When 2 tilted optical axis of linear light sources irradiates 3 surface of testee, it can be seen that concave-convex linear discontinuities have strong light
Strong variation, because linear light sources 2 have luminance component in the parallel and vertical direction of concave-convex linear discontinuities, concave-convex defect changes
The reflected energy of a direction, forms the grey scale change of image, and it is steady that concave-convex defect 4 can be obtained using this comparative information
Fixed, clearly image information.
The linear light sources 2 can be to the frontlighting of testee 3 in the present embodiment, can also be to its back lighting.Line style light
Source 2 can be dark field or light field to the type of lighting of testee 3.The luminescence unit that linear light sources 2 use mostly uses greatly LED
Grain, and the light source of various wavelength (red, green, blue, white) can be selected according to specific requirements.In addition linear light sources 2 can also transmission
Light, light penetrate testee 3, and line image acquisition device 1 receives transmitted light in the 3 plane of motion other side of testee and feels
Light.
For realizing the inclination of 2 primary optical axis of linear light sources, change the established angle of luminescence unit when can pass through mechanical erection
Degree is realized, can also be realized using components such as the optical films for installing optical lens or micro-structure additional.
As shown in figure 4, respective angles can directly be pressed in all luminescence unit mechanical erections by required inclined light shaft angle
Rotary luminous unit makes the light-emitting surface of luminescence unit end with inclined at inclination angles, changes luminescence unit primary optical axis angle.In addition
Under luminescence unit primary optical axis vertically downward installation situation, as shown in Figure 5 and Figure 6, optical lens is installed additional below luminescence unit
Or optical film of micro-structure etc., the primary optical axis angle on final irradiation 3 surface of testee also can be changed, reach same purpose.
Or in another embodiment, linear light sources 2 are illuminated using optical fiber source, utilize optical fiber light-guiding form, optical fiber light
Multifiber can be set as needed in source, and the primary optical axis of all optical fiber is parallel to each other, and change every optical fiber through light pipe and go out light
Direction also can reach the purpose of 2 primary optical axis oblique illumination of linear light sources.Optical fiber source is as shown in Figure 7 and Figure 8, optical fiber luminescent end 6
It is mounted on light shell outer cover 7 by light pipe, as needed with the installation of pre-determined tilt angle, optical fiber luminescent end 6 passes through light pipe
Transmission fiber 8 is connected with light source output equipment 10, and light source output equipment 10 is that optical fiber luminescent end 6 provides optical fiber.8 end of transmission fiber
Portion is equipped with the smooth coupling head 9 of optical fiber, and light source output equipment 10 is equipped with light source output interface 11, and transmission fiber 8 passes through optical fiber light
Sliding coupling head 9 is connected with light source output interface 11, realizes the connection of light source output equipment 10 and optical fiber luminescent end 6.
The detection device specific implementation flow is to be detected region 5 when testee 3 is transported to target by transmission part,
At this time line array sensor acquisition 3 image of testee position it is static with respect to line array sensor, 2 length direction of linear light sources and
Line array sensor detection direction is parallel, and plane where the optical axis of 2 luminescence unit of linear light sources intersects with 3 plane of movement of testee
Position exactly be detected region 5.Line array sensor exposes one or more photosensitive unit every time, with target testee
Relative displacement between 3 and line array sensor, line array sensor continuous exposure eventually form a width two dimensional image.
After concave-convex defect image of the optical imagery mechanism using line array sensor acquisition testee 3, pass through image procossing
Mechanism is handled, and is analyzed and is determined whether image complies with standard, and realizes the judgement to concave-convex linear discontinuities.When optical imagery machine
When structure starting, linear transducer acquires 3 image of target testee in real time, if testee 3 is printing screen, general use adds
Acquisition image is aligned with standard template, then compares the image on corresponding position by back(ing) board and automatic aligning, to image into
Then row filtering, noise reduction process carry out cluster to the region extracted and size positions are analyzed.If it is to general testee
3 Surface testing, such as sheet metal strip, paper, plastics, glass directly can do filtering noise reduction process to image, extract region
It is analyzed, which can notify equipment by the electric interfaces being pre-designed or worker is notified to be further processed.
Illustrate the detection effect of the detection device with the acquisition testing to aluminium foil products below, the aluminium foil strip scratched with full version
Material is testee 3, scratches the direction of motion that direction is basically parallel to aluminium foil band, and transmission part transports the aluminium foil band and examining
It is mobile to survey station, if detection station is detected using normal image, collected aluminium foil band surface image is as shown in figure 9, as examined
Station is surveyed using the detection device detection in the present embodiment, collected aluminium foil band surface image is as shown in Figure 10, the image
Middle scuffing Defect Comparison is strongly stable, more conducively detects.
Although the principles of the present invention are described in detail in the preferred embodiment above in conjunction with the utility model,
It should be appreciated by those skilled in the art that above-described embodiment is only the explanation to the exemplary implementation of the utility model, and
The non-restriction to the utility model scope.Details in embodiment does not constitute the limitation to the scope of the utility model, In
Without departing substantially from the utility model spirit and scope in the case where, any equivalent transformation based on technical solutions of the utility model, letter
Single replacement etc. is obvious to be changed, and is all fallen within scope of protection of the utility model.
Claims (10)
1. a kind of concave-convex defect detecting device based on linear array imaging, which is characterized in that the detection device includes line image
Acquisition device (1) and linear light sources (2)；The line image acquisition device (1) includes line array sensor and imaging len, is set
It sets above the linear light sources (2), testee (3) is passed through along fixed-direction by movement below the linear light sources (2)；
The intersection of plane and the testee (3) plane of motion where the optical axis of line image acquisition device (1) is formed
Linear regions be detected region (5)；
The linear light sources (2) deviate relative to the plane of movement of the testee (3) along the linear light sources (2) length direction
Preset distance, and length direction is vertical with the testee (3) moving direction, it is parallel with detected region (5)；It is described
Linear light sources (2) are towards testee (3) described in detected region (5) oblique illumination；Have when on the testee (3)
When having concave-convex defect (4), the linear light sources (2) have the anti-of illumination in the parallel and vertical direction of the concave-convex defect (4)
Component is penetrated, line image acquisition device (1) the reception reflected light is simultaneously photosensitive, forms grey scale change on acquisition image.
2. the concave-convex defect detecting device according to claim 1 based on linear array imaging, which is characterized in that the line style light
The tilt angle of plane is 5~175 ° where the key lighting face and the testee (3) in source (2).
3. the concave-convex defect detecting device according to claim 1 or 2 based on linear array imaging, which is characterized in that the line
The optical axis of type light source (2) is 10~80 ° along the linear light sources (2) length direction and detected region (5) tilt angle.
4. the concave-convex defect detecting device according to claim 1 based on linear array imaging, which is characterized in that the line style light
Source (2) includes multiple luminescence units, and multiple luminescence units are along the linear light sources (2) length direction is in a row or multiple rows of row
Column.
5. the concave-convex defect detecting device according to claim 4 based on linear array imaging, which is characterized in that all hairs
The primary optical axis of light unit is parallel to each other.
6. the concave-convex defect detecting device according to claim 5 based on linear array imaging, which is characterized in that all hairs
Light unit is by the rotation installation of required inclined light shaft angle, and the light for issuing the luminescence unit is with pre-determined tilt angle tilt.
7. the concave-convex defect detecting device according to claim 5 based on linear array imaging, which is characterized in that the luminous list
First primary optical axis is installed vertically downward, installs optical lens below the luminescence unit additional, and the testee (3) are finally irradiated in change
The primary optical axis angle on surface.
8. the concave-convex defect detecting device according to claim 5 based on linear array imaging, which is characterized in that the luminous list
First primary optical axis is installed vertically downward, installs the optical film of micro-structure below the luminescence unit additional, and change is finally irradiated described tested
The primary optical axis angle on object (3) surface.
9. the concave-convex defect detecting device according to claim 4 based on linear array imaging, which is characterized in that multiple hairs
When light unit is at multiple rows of arrangement, the luminescence unit of front and rear row is arranged at staggered arrangement, or using aligned identical sequence.
10. the concave-convex defect detecting device according to claim 1 based on linear array imaging, which is characterized in that the line style
Light source (2) is illuminated using optical fiber source, and the optical fiber source includes optical fiber luminescent end (6), light shell outer cover (7), transmission fiber (8)
With light source output equipment (10), the optical fiber luminescent end (6) is mounted on the light shell outer cover (7) by light pipe, described to lead
For light pipe as needed with the installation of pre-determined tilt angle, the optical fiber luminescent end is defeated by the transmission fiber (8) and the light source
Equipment (10) is connected out, and the light source output equipment (10) is that the optical fiber luminescent end (6) provides optical fiber.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111337433A (en) * | 2020-05-21 | 2020-06-26 | 深圳新视智科技术有限公司 | Defect layering device and method for surface defect detection |
| CN112666162A (en) * | 2020-12-17 | 2021-04-16 | 苏州天禄光科技股份有限公司 | Light guide plate mesh point density detection equipment and detection method thereof |
| CN112858321A (en) * | 2021-02-22 | 2021-05-28 | 南京理工大学 | Steel plate surface defect detection system and method based on linear array CCD |
| CN114088715A (en) * | 2020-08-24 | 2022-02-25 | 深圳市创科自动化控制技术有限公司 | Planar imaging method |
| CN114390152A (en) * | 2021-10-27 | 2022-04-22 | 山东华菱电子股份有限公司 | Contact type image sensor for detecting micro concave-convex and application thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111337433A (en) * | 2020-05-21 | 2020-06-26 | 深圳新视智科技术有限公司 | Defect layering device and method for surface defect detection |
| CN111337433B (en) * | 2020-05-21 | 2020-09-08 | 深圳新视智科技术有限公司 | Defect layering device and method for surface defect detection |
| CN114088715A (en) * | 2020-08-24 | 2022-02-25 | 深圳市创科自动化控制技术有限公司 | Planar imaging method |
| CN112666162A (en) * | 2020-12-17 | 2021-04-16 | 苏州天禄光科技股份有限公司 | Light guide plate mesh point density detection equipment and detection method thereof |
| CN112666162B (en) * | 2020-12-17 | 2023-03-10 | 苏州天禄光科技股份有限公司 | Light guide plate mesh point density detection equipment and detection method thereof |
| CN112858321A (en) * | 2021-02-22 | 2021-05-28 | 南京理工大学 | Steel plate surface defect detection system and method based on linear array CCD |
| CN114390152A (en) * | 2021-10-27 | 2022-04-22 | 山东华菱电子股份有限公司 | Contact type image sensor for detecting micro concave-convex and application thereof |
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