CN110044928A - A kind of detection device of space encoding light field to bend glass surface defect - Google Patents
A kind of detection device of space encoding light field to bend glass surface defect Download PDFInfo
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- CN110044928A CN110044928A CN201910328571.0A CN201910328571A CN110044928A CN 110044928 A CN110044928 A CN 110044928A CN 201910328571 A CN201910328571 A CN 201910328571A CN 110044928 A CN110044928 A CN 110044928A
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- bend glass
- projector
- light
- ccd camera
- detection device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention discloses a kind of space encoding light fields to the detection device of bend glass surface defect, comprising: projector, CCD camera and data processing module；The projector generates encoded light rays by receiving the modulation of coded command modulated monochromatic light, and is projected to bend glass surface and form coded image；The clarity of the coded image is not limited by bend glass state；The CCD camera is used to acquire the coded image on bend glass surface；The data processing module is used to provide coded command for projector, and passes through analysis of encoding image detection glass surface defects.Projector of the present invention includes dmd chip and doubly telecentric projecting cell, realizes and obtains the constant coded image of amplification factor before and after testee deformation, is detected using it to bend glass surface defect, detection efficiency and accuracy can be promoted.
Description
Technical field
The invention belongs to defects detection fields, lack more particularly, to a kind of space encoding light field to bend glass surface
Sunken detection device.
Background technique
Under the intelligent more and more flourishing epoch, glass had been detached from it is hard in the previous impression of people, it is frangible, put down
The features such as face.Bend glass is widely used in the electronics such as mobile phone, computer due to the characteristics of being more suitable for human eye's vision at present
Product scope.And often specification is smaller and is hidden among glass for the fine cracks on curved surface, therefore is difficult through traditional dress
Standby and method is detected.
Traditional detection method be with a large amount of defective training samples staff, observe for a long time using them with
Learn obtained experience to judge whether possess crack on bend glass.However this method is obvious during batch production
It is time-consuming and laborious, and precision is lower.In short, for the defects detection on bend glass, be also in now one it is lower
Level, there are no a kind of preferable methods can be not only accurate, but also quick detection method.
Summary of the invention
In view of the drawbacks of the prior art, the purpose of the present invention is to provide a kind of space encoding light fields to bend glass surface
The detection device of defect, it is intended to solve the problems, such as the prior art to the defects detection low efficiency of bend glass.
To achieve the above object, the present invention provides a kind of space encoding light fields to the detection dress of bend glass surface defect
It sets, comprising: projector, CCD camera and data processing module；
The projector is located at the ipsilateral of bend glass with CCD camera under working condition, and the optical axis of the projector is vertical
In the axial direction of bend glass, the optical center of the CCD camera and the optical center of projector are located in same horizontal line；
The projector is connect with data processing module with CCD camera；
The projector generates encoded light rays by receiving the modulation of coded command modulated monochromatic light, and is projected to curved surface
Glass surface forms coded image；
The clarity of the coded image is not limited by bend glass state；
The CCD camera is used to acquire the coded image on bend glass surface；
The data processing module is used to provide coded command for projector, and passes through analysis of encoding image detection glass table
Planar defect.
Preferably, the projector includes: that monochromatic source, collimation unit, dmd chip, TIR prism and doubly telecentric projection are single
Member；
Monochromatic source, collimation unit and TIR prism are arranged successively in horizontal direction；
The collimation unit is used to monochrome being optically coupled to TIR prism；
On vertical direction, the TIR prism is between dmd chip and doubly telecentric projecting cell, for that will be incident on DMD
Incident ray and reflection light on chip separate, and avoid the interference of light；
That is, TIR prism is transmitted through doubly telecentric projection by reflection of monochromatic light to dmd chip, and by the emergent light of dmd chip
Unit；
The dmd chip generates encoded light rays by the incident light that TIR prism transmitting is modulated in received coded command, and will
It reflexes to TIR prism；
The doubly telecentric projecting cell is located above bend glass, and its optical axis direction is the side of TIR prism emergent ray
To forming coding pattern on bend glass for projecting to encoded light rays；
Preferably, detection device of the space encoding light field to bend glass surface defect, further includes: field stop,
Between the projector and bend glass, for the visual field according to the big minor adjustment projector of bend glass；
Preferably, detection device of the space encoding light field to bend glass surface defect, further includes: monochrome filters single
Member, between bend glass and CCD camera, optical axis direction is the optical axis direction of CCD camera, for reflecting in bend glass
Light in filter out light identical with monochromatic source wavelength.
Preferably, detection device of the space encoding light field to bend glass surface defect, further includes: glass loading
Platform is used to support bend glass；
Preferably, the data processing module is computer；
Preferably, the monochromatic source is the light source of Wavelength tunable.
Contemplated above technical scheme through the invention, compared with prior art, can obtain it is following the utility model has the advantages that
(1) projector that the present invention uses is compiled required for generating it by received coded command modulated monochromatic light
Code light, the encoded light rays are projected in the clarity of the coded image formed on bend glass not by the limit of bend glass state
System, such as incident light is modulated the present invention provides dmd chip and generates encoded light rays, while using doubly telecentric projecting cell
The measurement error as caused by parallax is eliminated or reduces, and the doubly telecentric projecting cell has the biggish depth of field, makes encoded light rays
The clarity for projecting the coded image formed to bend glass will not be influenced by shape, the motion state of bend glass, so
It is projected coding pattern to distort small and projected fringe high resolution, can be applied to the bend glass defects detection of batch production,
Identification glass defect is gone with experience by largely learning compared to technical staff, efficiency has been significantly improved.
(2) present invention is carried out after first pre-processing correction to it using the coded image on CCD camera acquisition bend glass surface
Decoding, by the Feature Points Matching in the projection pattern of characteristic point and setting on collected coded image；Pass through projector again
The calibrated system parameter between CCD camera rebuilds the three-dimensional appearance data of object using principle of triangulation, can be accurate
The defective locations of bend glass are positioned, therefore, the present invention goes to judge the defect of bend glass, inspection compared to traditional artificial experience
It is more accurate to survey result.
(3) one aspect of the present invention uses field stop according to the visual field of the big minor adjustment projector of sample, in sample size
Replaceable field stop when changing, makes coded image all be covered in the surface of bend glass；On the other hand according to reality
Adjustable monochromatic source can be used in demand, at the same can also be used monochromatic filter unit filtered out in the light that bend glass reflects with
The identical light of monochromatic source wavelength, improves the vulnerability to jamming of device；Field stop, monochromatic filter unit and adjustable monochromatic source
Flexibility not only increases the measurement accuracy of detection device, while also improving the applicability of detection device.
Detailed description of the invention
Fig. 1 is structural schematic diagram depending on detection device provided by the invention；
Fig. 2 is the schematic diagram of internal structure of projector provided by the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1, the present invention provides a kind of space encoding light fields to the detection device of bend glass surface defect, packet
It includes: projector 101, CCD camera 109 and data processing module；
The projector 101 is located at the ipsilateral of bend glass with CCD camera 109 under working condition, the projector 101
For optical axis perpendicular to the axial direction of bend glass 107, the optical center of the CCD camera and the optical center of projector are located at same horizontal line
On；
The projector 101 is connect with data processing module with CCD camera；
The projector 101 by receive coded command modulated monochromatic light modulation generate encoded light rays, and projected to
Bend glass surface forms coded image；
The clarity of the coded image is not limited by bend glass state；
The CCD camera 109 is used to acquire the coded image on bend glass surface；
The data processing module is used to provide coded command for projector, and passes through analysis of encoding image detection glass table
Planar defect.
As shown in Fig. 2, the projector 101 includes: monochromatic source 102, collimation unit, dmd chip 103, TIR prism
104 and doubly telecentric projecting cell 105；
Monochromatic source 102, collimation unit and TIR prism 104 are arranged successively in horizontal direction；
The collimation unit is used to monochrome being optically coupled to TIR prism 104；
On vertical direction, for the TIR prism 104 between dmd chip 103 and doubly telecentric projecting cell 105, being used for will
The incident ray and reflection light being incident on dmd chip separate, and avoid the interference of light；
That is, TIR prism 104 is by reflection of monochromatic light to dmd chip 103, and the emergent light of dmd chip 103 is transmitted through
Doubly telecentric projecting cell 105；
The dmd chip 103 modulates the incident light that TIR prism 104 transmits by received coded command and generates encoded light
Line, and reflexed to TIR prism 104；
The doubly telecentric projecting cell 105 is located above bend glass, and its optical axis direction is 104 emergent light of TIR prism
The direction of line forms coding pattern for projecting to encoded light rays on bend glass；
Preferably, detection device of the space encoding light field to bend glass surface defect, further includes: field stop
106, between the projector 101 and bend glass 107, for according to the big minor adjustment projector of bend glass 107
Visual field；
The design requirement that doubly telecentric projecting cell 105 is needed to meet in the present invention are as follows: the preceding light of object telecentric beam path in image space
The rear focus of group is overlapped with the object focus of rear light group, i.e., optical interval Δ=0, system are afocal system.
The step of design is to design an image space telecentric system first, then carries out structure to the image space telecentric system of optimization
Symmetry transformation, obtain object space telecentric system or directly redesign an object space telecentric system, finally by object space telecentric beam path
It is combined to form doubly telecentric optical path with telecentric beam path in image space.
It may be noted that the object space telecentric beam path refers to, aperture diaphragm is arranged in the image space focal plane of object lens, object is only made
Square chief ray passes through the rear focus imaging where diaphragm, and all light can regard as from infinite point, can eliminate or
Reduce the measurement error as caused by parallax.
The telecentric beam path in image space refers to that aperture diaphragm is placed in the object space focal plane of camera lens, into the light beam of camera lens
Chief ray all pass through the object focus where diaphragm center, then chief ray is parallel to optical axis in image space.
Above-mentioned characteristic based on the doubly telecentric projecting cell 105 is it is found that the variation as plan-position will not influence light
The change of the imaging size of system, i.e. image distance will not influence the size of image.
Due to the defect on the present invention predominantly curved surface detected, so the light issued from the same light source passes through curved surface
The reflection of glass surface, light path experienced is different when reaching the camera lens of CCD camera 109, i.e., because testee is from CCD
The distance of the distance of camera lens of camera is inconsistent, be easy to cause enlargement ratio different, and telecentric lens can be in object distance range
The image enlargement ratio made will not change, and be very important application to situation of the measured object not on same object plane.
Preferably, detection device of the space encoding light field to bend glass surface defect, further includes: monochrome filters single
Member 110, between bend glass 107 and CCD camera, optical axis direction is the optical axis direction of CCD camera, in curved surface glass
Light identical with monochromatic source wavelength is filtered out in the light of glass reflection.
Preferably, detection device of the space encoding light field to bend glass surface defect, further includes: glass objective table
108, it is used to support bend glass 107；
Preferably, the data processing module is computer；
Preferably, the monochromatic source 102 is the uniform source of light of Wavelength tunable, it can be ensured that bent in longer curved surface
The illumination that all faces of surface glass 107 are subject to is equal and uniform；The wavelength of the monochromatic source 102 can be adjusted from ultraviolet wavelength
To infrared wavelength, power can also be adjusted from small to large, the convenient test to different curve glass 107, can in practical application
The preferable wavelength of effect and power are first chosen, then carries out Image Acquisition and processing work.
Detection device provided by the invention carries out in the environment of darkroom as far as possible, can maximally reduce natural light and bring
Information to coding light field interference.
Actual monitoring process need to follow the steps below:
S1: optical path is built
S1.1 designs the doubly telecentric optical projection system for meeting measurement request, and the telecentricity of doubly telecentric optical projection system is less than 1 degree；
S1.2 realizes the Uniform Illumination of wavelengthtunable using monochromatic adjustable high uniformity light source on dmd chip；
S1.3 dmd chip matches the tilt angle of each micro mirror in corresponding drive control device control dmd chip, realizes
Light and shade switches demand；
When the micro mirror in DMD is in illuminated state, light beam is reflected through micro mirror, and striped is vertically projected to through doubly telecentric optical projection system
Sample to be tested generates illumination bright fringes.When micro mirror is in dark-state, the reflected beams are blocked in outside doubly telecentric optical projection system, unglazed
Beam can enter optical projection system, and DMD to be measured is in dark-state.
S1.4 determines the size of field stop according to the size of sample to be tested；
S1.5 determines that monochrome filter system filters out matched wavelength according to the wavelength of selected monochromatic source, thus
Complete building for optical path；
S2: projector and CCD camera are demarcated
S2.1 puts annulus scaling board in the position of sample to be tested；
S2.2 is according to calibration tool, between the world coordinate system that the pixel coordinate system and scaling board for obtaining CCD camera represent
Position orientation relation；
S2.3 controls programmable projector using PC and distinguishes high speed 12 width images of projection in the two directions x and y, utilizes four
It walks phase shift method and carries out the calculating of phase main value, then wrapped phase is unfolded to obtain absolute phase values by three frequency heterodyne methods, thus
The coordinate of characteristic point into DLP；
S2.4 obtains DLP coordinate system according to the world coordinates of characteristic point on the pixel coordinate and scaling board of characteristic point in DLP
The position orientation relation between world coordinate system that relative Calibration plate represents, that is, complete the calibration of DLP；
S2.5 establishes the position orientation relation between DLP coordinate and CCD camera coordinate；
S3:PC controls the programmable DLP secondary coding pattern of projection one at a high speed, while synchronous triggering CCD camera acquires deformation
Coded image；
S4: pretreatment correction is carried out to the coded image of collected deformation, and is decoded；
S5: by the Feature Points Matching in the characteristic point and projection pattern on collected coded image；
S6: according to the device parameter of calibration, the three-dimensional appearance data of object are rebuild with principle of triangulation, to observe
The case where bend glass surface.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (7)
1. a kind of space encoding light field is to the detection device of bend glass surface defect characterized by comprising projector, CCD
Camera and data processing module；
The projector is located at the ipsilateral of bend glass with CCD camera under working condition, and the optical axis of the projector is perpendicular to song
The axial direction of surface glass, the optical center of the CCD camera and the optical center of projector are located in same horizontal line；
The projector is connect with data processing module with CCD camera；
The projector generates encoded light rays by receiving the modulation of coded command modulated monochromatic light, and is projected to bend glass
Surface forms coded image；
The clarity of the coded image is not limited by bend glass state；
The CCD camera is used to acquire the coded image on bend glass surface；
The data processing module is used to provide coded command for projector, and passes through analysis of encoding image detection bend glass
Surface defect.
2. detection device as described in claim 1, which is characterized in that the projector include: monochromatic source, collimation unit,
Dmd chip, TIR prism and doubly telecentric projecting cell；
Monochromatic source, collimation unit and TIR prism are disposed in horizontal direction；The collimation unit is used for monochromatic optocoupler
It is bonded to TIR prism；
On vertical direction, the TIR prism is between dmd chip and doubly telecentric projecting cell, for that will be incident on dmd chip
On incident ray and reflection light separate；
The dmd chip generates encoded light rays by the incident light that TIR prism transmitting is modulated in received coded command, and it is anti-
It is incident upon TIR prism；
The doubly telecentric projecting cell is located above bend glass, and its optical axis direction is the direction of TIR prism emergent ray, is used
Coding pattern is formed on bend glass in projecting to encoded light rays.
3. detection device as claimed in claim 1 or 2, which is characterized in that further include: field stop, under working condition between
Between the projector and bend glass, for the visual field according to the big minor adjustment projector of bend glass.
4. detection device as claimed in claim 3, which is characterized in that further include monochromatic filter unit, under working condition between
Between bend glass and CCD camera, optical axis direction is the optical axis direction of CCD camera, the light for reflecting in bend glass
In filter out light identical with monochromatic source wavelength.
5. detection device as described in claim 1 or 4, which is characterized in that further include: glass objective table is used to support curved surface
Glass.
6. detection device as claimed in claim 5, which is characterized in that the data processing module is computer.
7. detection device as claimed in claim 6, which is characterized in that the monochromatic source is the light source of Wavelength tunable.
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Cited By (3)
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| CN112683787A (en) * | 2019-10-17 | 2021-04-20 | 神讯电脑(昆山)有限公司 | Object surface detection system and detection method based on artificial neural network |
| CN112683921A (en) * | 2019-10-17 | 2021-04-20 | 神讯电脑(昆山)有限公司 | Image scanning method and image scanning system for metal surface |
| US12111267B2 (en) | 2019-05-15 | 2024-10-08 | Getac Holdings Corporation | System for detecting surface type of object and artificial neural network-based method for detecting surface type of object |
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Application publication date: 20190723 |