CN109901344A - Annular coaxial light-source generation device, NI Vision Builder for Automated Inspection and application method - Google Patents
Annular coaxial light-source generation device, NI Vision Builder for Automated Inspection and application method Download PDFInfo
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Abstract
The present invention relates to a kind of annular coaxial light-source generation device, NI Vision Builder for Automated Inspection and application methods.The device includes that module and spectral module occur for the light emitting module, collimating module, diffraction light-free set gradually, and the optical axis that module occurs for light emitting module, collimating module and diffraction light-free is on same straight line；Light emitting module is for providing light beam；Collimating module is for collimating to obtain directional light light beam；Directional light generates the salt free ligands ring of light after module occurs for diffraction light-free；Spectral module is used to the salt free ligands ring of light reflexing to object under test；Module occurs for diffraction light-free and the optical distance L of object under test is greater than the maximum the non diffracting distance Zmax that module occurs for diffraction light-free；Diffraction light-free generation module is adjustable at a distance from spectral module and/or spectral module is adjustable at a distance from object under test.The device can provide uniformity good annular coaxial light source, and can adjust ring of light size as needed, can significantly improve the accuracy of NI Vision Builder for Automated Inspection and adapt to range.
Description
Technical field
This application involves technical field of machine vision more particularly to a kind of annular coaxial light-source generation devices, machine vision
System and application method.
Background technique
With the gradually development of industrial automation and artificial intelligence, machine vision role is more and more important, and light
The illumination in source plays critical effect in machine vision.In NI Vision Builder for Automated Inspection, testee is by camera lens in camera
Upper imaging, the measurement accuracy and image quality of object are closely bound up, and the illumination of object directly affects image quality, so at present
Major machine vision manufacturer is using light source as the important accessory of machine vision.
Annular light source is a kind of using commonplace machine vision light source, in the prior art, annular light source generally by
LED array is arranged in a circle and is constituted, and the irradiating angle and irradiated area of this light source are usually fixation, and exploitation finishes
After be difficult to be adjusted.In addition, the uniformity of machine vision light source air exercise light effect has higher requirement, coaxial light source is ratio
Comparatively ideal selection, and LED is applied since its characteristics of luminescence is also difficult to be combined into the coaxial light source of annular by the group of array
With apparent limitation.
Summary of the invention
This application provides a kind of annular coaxial light-source generation device, NI Vision Builder for Automated Inspection and application method, can provide
The good annular coaxial light source of even property, and ring of light size can be adjusted as needed, the essence of NI Vision Builder for Automated Inspection can be significantly improved
True property and adaptation range.
In a first aspect, this application provides a kind of annular coaxial light-source generation devices comprising including the hair set gradually
Module and spectral module, the optical axis of the light emitting module and the collimating module occur for optical module, collimating module, diffraction light-free
Optical axis and the diffraction light-free occur module optical axis be on same straight line；Wherein,
The light emitting module is for providing light beam；
The collimating module is for collimating to obtain directional light the light beam；
The directional light generates the salt free ligands ring of light after module occurs for the diffraction light-free；
The spectral module is used to the salt free ligands ring of light reflexing to object under test, provides annular with measuring targets
The illumination of coaxial light source；
Wherein, module occurs for the diffraction light-free and the optical distance L of the object under test is sent out greater than the diffraction light-free
The maximum the non diffracting distance Zmax of raw module；
And module adjustable and/or described spectral module at a distance from the spectral module occurs for the diffraction light-free
It is adjusted at a distance from the object under test.
As a kind of specific embodiment, described device further includes plus lens, and the plus lens is located at diffraction light-free
Occur between module and spectral module, and the light shaft coaxle of module occurs for its optical axis and the diffraction light-free.
As a kind of specific embodiment, the collimating module includes several lens.
As a kind of specific embodiment, it includes axicon mirror that module, which occurs, for the diffraction light-free.
As a kind of specific embodiment, the spectral module includes semi-transparent reflective mirror or dichroscope.
As a kind of specific embodiment, the angle of the light-splitting device of the optical axis of the light emitting module and the spectral module
It is 45 °.
The structure of the annular coaxial light-source generation device of the application is simple, can not only provide illumination uniformity good ring
Shape coaxial light source, additionally it is possible to adjust the size of the ring of light according to actual needs.
Second aspect, this application provides a kind of NI Vision Builder for Automated Inspections, comprising: in image-forming module and above-mentioned technical proposal
Annular coaxial light-source generation device described in any one, wherein
The image-forming module is for shooting object under test.
As a kind of specific embodiment, the optical axis of the image-forming module is vertical with the optical axis of the light emitting module.
The third aspect, present invention also provides a kind of application methods of NI Vision Builder for Automated Inspection, comprising:
The light beam that light source module issues is carried out beam-expanding collimation to obtain directional light by collimating module；
Diffraction light-free occurs module and the directional light received is become the salt free ligands ring of light；
Spectral module reflexes to the salt free ligands ring of light on object under test, to illuminate object under test；
Image-forming module shoots the object under test after illumination.
As a kind of specific embodiment, the step of image-forming module shoots the object under test after illumination it
Before, further includes:
It adjusts the diffraction light-free and module occurs at a distance from the spectral module and/or the spectral module and institute
The distance of object under test is stated, to adjust the size for the ring of light for illuminating the object under test.
The application provides a kind of annular coaxial light-source generation device, NI Vision Builder for Automated Inspection and application method.The annular coaxial
Light-source generation device can provide uniformity good annular coaxial light source, and can adjust ring of light size as needed, can be significant
It improves the accuracy of NI Vision Builder for Automated Inspection and adapts to range.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in embodiment description
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is some embodiments of the present application, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of NI Vision Builder for Automated Inspection of the embodiment of the present application one；
Fig. 2 is a kind of another structural schematic diagram of NI Vision Builder for Automated Inspection of the embodiment of the present application one；
Fig. 3 is the optical schematic diagram that the salt free ligands ring of light of the embodiment of the present application one generates；
Fig. 4 is the floor map of the salt free ligands ring of light of the embodiment of the present application one；
Fig. 5 is the schematic diagram of the different size of ring of light generated by adjusting of the embodiment of the present application one；
Fig. 6 is a kind of structural schematic diagram of NI Vision Builder for Automated Inspection of the embodiment of the present application two；
Fig. 7 is the optical simulation comparison diagram of the generation salt free ligands ring of light of the embodiment of the present application one and embodiment two；
Fig. 8 is the optical simulation comparison diagram for adjusting L ' in the embodiment of the present application two and generating the salt free ligands ring of light；
Fig. 9 is the plane comparison diagram of the salt free ligands ring of light of the generation of the embodiment of the present application two in fig. 8.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiment is some embodiments of the present application, instead of all the embodiments.Based on this Shen
Please in embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall in the protection scope of this application.
It should be appreciated that ought use in this specification and in the appended claims, term " includes " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but one or more of the other feature, whole is not precluded
Body, step, operation, the presence or addition of element, component and/or its set.
It is also understood that mesh of the term used in this present specification merely for the sake of description specific embodiment
And be not intended to limit the application.As present specification and it is used in the attached claims, unless on
Other situations are hereafter clearly indicated, otherwise " one " of singular, "one" and "the" are intended to include plural form.
It will be further appreciated that the term "and/or" used in present specification and the appended claims is
Refer to any combination and all possible combinations of one or more of associated item listed, and including these combinations.
Embodiment one
Referring to Fig. 1, Fig. 1 is a kind of structural schematic diagram of NI Vision Builder for Automated Inspection provided by the embodiments of the present application.The machine
Annular coaxial light-source generation device possessed by vision system is capable of providing the highly uniform annular coaxial light beam of illumination, and can lead to
Crossing the generation of change diffraction light-free, module is at a distance from spectral module and/or spectral module is adjusted at a distance from object under test
The annulus size of annular coaxial light beam for illumination, i.e. user can adjust corresponding shine according to the flexible in size of object under test
Area pellucida domain.
The annular coaxial light-source generation device of the NI Vision Builder for Automated Inspection, including light emitting module 4, the collimating module set gradually
5 and diffraction light-free module 6 and spectral module 2, the optical axis of light emitting module 4 and the optical axis and salt free ligands of collimating module 5 occurs
The optical axis that module 6 occurs for light is on same straight line；Wherein,
Light emitting module 4 is for providing light beam；
Collimating module 5 is for collimating to obtain directional light light beam；Directional light is after module 6 occurs for diffraction light-free
Generate the salt free ligands ring of light；Spectral module 2 is used to the salt free ligands ring of light reflexing to object under test 3, provides ring with measuring targets 3
The illumination of shape coaxial light source；
Wherein, module 6 occurs for diffraction light-free and the optical distance L of object under test 3 is greater than diffraction light-free generation module 6 most
Big the non diffracting distance Zmax；
And module 6 adjustable and/or spectral module 2 and determinand at a distance from spectral module 2 occur for diffraction light-free
The distance of body 3 is adjustable.
Diffraction light-free is a kind of zero-order Bessel light beam, and diffraction phenomena, light beam can occur in communication process for general light beam
Continuous diverging, and diffraction light-free light beam in communication process will not dissipate, and after encountering barrier, be able to carry out self weight
It builds.Due to both characteristics of zero-order Bessel light beam, it has important application in accurate measurement and photoelectric field, such as optics
The fields such as accurate measurement, laser boring, laser cutting, fiber coupling.And diffraction light-free is due to its diffraction characteristic, diffraction annulus
Uniformity and systematicness with height are applied in machine vision illumination field, have inborn uniform sexual clorminance.
The present embodiment utilizes the transmission characteristic of diffraction light-free to will form one after that is, diffraction light-free is more than salt free ligands region
Module can occur by adjusting diffraction light-free for the annulus of brightness uniformity, the size of annulus at a distance from spectral module, and/or
Spectral module realizes at a distance from object under test, and because annulus is generated by the way that light is relevant, the uniformity without
It need to be guaranteed by other light balancing devices.
Wherein, the light beam of sending can be become directional light or less parallel by light emitting module 4 after collimating module 5
Light, the light beam after collimation occur module 6 using diffraction light-free and can produce diffraction light-free, which passes through spectral module 2
Light beam after reflection is incident upon on object under test 3, realizes the uniform annular coaxial optical illumination of determinand.In the present embodiment, it sends out
Optical module 4 uses high-power LED light source.
Module 6, which occurs, for diffraction light-free can be converted into directional light Beams or approximate non-diffracting beams, and by
It is coherent light in it, therefore uniformity is very outstanding.Generate the adoptable method of diffraction light-free have axicon method, Diffraction grating,
Circumferential weld method, Resonant-cavity Method etc., wherein be method most simple, that cost is minimum using axicon method, in the present embodiment, diffraction light-free
The optical device that generation module 6 uses is axicon mirror.
As shown in figure 3, being salt free ligands region in the range of maximum the non diffracting distance Zmax.In practical application, being true
It is conformal at coaxial annular light beam, need that module 6 occurs for diffraction light-free and the optical distance L of object under test 3 is greater than diffraction light-free hair
The maximum the non diffracting distance Zmax of raw module 6.Maximum the non diffracting distance Zmax is related to axicon mirror parameter itself, specifically,
Zmax=D/2 (n-1) α, α are axicon angle, and n is the refractive index of axicon mirror, and D is the light passing diameter of axicon mirror.
Specifically, the light beam that effective light passing diameter after collimation is D0 will generate salt free ligands after axicon mirror
Light, diffraction light-free are remained unchanged in the distribution of the light intensity in salt free ligands region, the characteristic with zero-order Bessel light beam, when light beam passes
When broadcasting distance and being greater than maximum the non diffracting distance Zmax, a hollow annulus will form, the width t=D0/2 of annulus, outer circle
By changing diffraction light-free module 6 and object under test 3 occur for diameter D1=2Ltan (n-1) α, interior circular diameter D2=D1-D0
Optical distance L can change simultaneously the value of D1 and D2, achieve the purpose that adjustable ring of light size.For example, the illumination ring of light such as Fig. 4 institute
Show, due to symmetrical device centered on axicon mirror, the basic phase of hot spot phase that is radiated on the ring of light face on object under test 3
Together, therefore it can guarantee the uniformity that the ring of light illuminates.In addition, since the optical distance L of module 6 and object under test 3 occurs for diffraction light-free
Bigger, the size for illuminating the ring of light gradually increases, as shown in figure 5, from left to right optical distance L value increases, correspondingly illuminates the ring of light
Size also increase.
In addition, by adjust diffraction light-free occur module 6 with spectral module 2 at a distance from, or adjust spectral module 2 and to
The distance for surveying object 3, can be adjusted accordingly to the annulus internal-and external diameter of the salt free ligands ring of light, so as to be various sizes of to be measured
Object 3 provides corresponding illumination.
The uniform illumination ring of light is provided in the above-mentioned annular coaxial light-source generation device of the NI Vision Builder for Automated Inspection of the present embodiment
Under condition, the image-forming module 1 of the NI Vision Builder for Automated Inspection of the present embodiment is placed in the surface of object under test 3, it is preferable that imaging mould
The optical axis of block 1 passes through the center that annular coaxial light-source generation device is radiated at the ring of light on object under test 3.And in the process of application
In, in order to realize better coaxial effect, optical axis and light emitting module 4, the collimating module 5 and diffraction light-free of image-forming module 1 occur
The optical axis of module 6 is preferably vertical.Spectral module 2 uses semi-transparent reflective mirror.Spectral module 2 is the required of annular coaxial light source
Condition, light source are realized with the coaxial necessarily spectral module 2 of image-forming module 1.Certainly, in other examples, spectral module 2
It can also be that dichroscope, the present embodiment are not made uniquely to limit to the optical device that spectral module 2 is specifically selected.
As shown in Fig. 2, be a kind of mapped structure to the present embodiment, in the mapped structure of the present embodiment, light emitting module 4
Using laser, collimating module 5 includes there are two lens, and the laser that collimating module 5 issues laser carries out beam-expanding collimation.
Preferably, in the present embodiment, spectral module 2 is 45 ° with the angle of the optical axis of light emitting module 4, in order to more
The good coaxial precision of control, is adjusted in use conducive to user.
Embodiment two
Referring to FIG. 6, a kind of structural schematic diagram of NI Vision Builder for Automated Inspection of the embodiment of the present invention two, the machine of the present embodiment
The annular coaxial light-source generation device of device vision system also has plus lens 7, and plus lens 7 is located at diffraction light-free and module occurs
Between 6 and spectral module 2, and the light shaft coaxle of module 6 occurs for its optical axis and diffraction light-free.It is consistent with one principle of embodiment,
In the present embodiment, it is also desirable to which module 6 occurs for diffraction light-free and the optical distance L of object under test 3 is greater than diffraction light-free generation module 6
Maximum the non diffracting distance Zmax, as shown in fig. 6, L=L1+L2.The setting of plus lens 7 can make the illumination for illuminating the ring of light bright
Degree promotes illumination region simultaneously and more concentrates.Specifically, the light beam simulation comparison effect after increasing plus lens 7 can be such as Fig. 7
It is shown, in Fig. 7 below figure indicate be increase plus lens 7 after, light beam is more concentrated, upper in brightness of illumination ratio Fig. 7
Face Tu Genggao, and the ring width of the ring of light also reduces.In addition, change the distance L ' that module 6 and plus lens 7 occur for diffraction light-free,
The width t of the changeable illumination ring of light；Distance L ' is bigger, and the width of annulus is wider, and distance L ' is smaller, and the width of annulus is narrower, such as
It is below the index path of reduction distance L ' above to increase distance L ' index path afterwards shown in Fig. 8；Accordingly, the flat of the ring of light is illuminated
For face comparison diagram as shown in figure 9, the annulus on the left side is the ring of light plan view of Fig. 8 above figure, the annulus on the right is the light of figure below Fig. 8
Plane of a loop figure, i.e. distance L ' is smaller, and the width t of annulus is narrower.
The NI Vision Builder for Automated Inspection of the present embodiment is produced by above-mentioned annular coaxial light source occurs mould at the diffraction light-free in device
Block 6 generates diffraction ring light, carries out even light without even mating plate, it is crucial that adjustable for illuminating the light of object under test 3
Ground illumination region can be adjusted flexibly in ring size according to the specific pattern of object under test 3.
The NI Vision Builder for Automated Inspection of the present embodiment can not only provide highly uniform when measuring targets 3 are detected
Annular optical illumination, meanwhile, when that may have blocking for small area in measuring targets 3 are illuminated, due to diffraction light-free
Have the function of via Self-reconfiguration, this interference can be eliminated.
Embodiment three
The present embodiment also provides a kind of application method of NI Vision Builder for Automated Inspection, and method is applied to above-described embodiment one or real
In the NI Vision Builder for Automated Inspection for applying example two, it can specifically include following steps:
The light beam that light source module issues is carried out beam-expanding collimation to obtain directional light by step S10, collimating module；
Step S20, diffraction light-free occur module and the directional light received are become the salt free ligands ring of light；
Step S30, spectral module reflex to the salt free ligands ring of light on object under test, to illuminate object under test；
Step S40, image-forming module shoot the object under test after illumination.
Specifically, the light beam of sending can be become directional light or less parallel by light emitting module 4 after collimating module 5
Light, the light beam after collimation occur module 6 using diffraction light-free and can produce the salt free ligands ring of light, and the salt free ligands ring of light is by light splitting mould
Light beam after block 2 reflects is incident upon on object under test 3, realizes the uniform annular coaxial optical illumination of measuring targets 3.
In addition, in practical application, forming annular coaxial light beam, user needs to adjust to ensure to be formed the salt free ligands ring of light
The optical distance L that module 6 and object under test 3 occur for whole diffraction light-free be greater than diffraction light-free occur the maximum salt free ligands of module 6 away from
From Zmax.
Example IV
The present embodiment four and the difference of above-described embodiment three be, can be the following steps are included: adjusting before step S40
Saving diffraction light-free generation, module is at a distance from spectral module and/or spectral module is at a distance from object under test, to adjust illumination
The size of the ring of light of object under test.
Wherein, the optical distance L of module 6 and object under test 3 occurs for adjustment diffraction light-free, and optical distance L is made to be greater than maximum
The non diffracting distance Zmax can generate annular coaxial light beam on object under test 3 at this time to illuminate for it.Furthermore as shown in figure 3,
Outer circle ring diameter D1=2Ltan (n-1) α, inner circle ring diameter D2=D1-D0, as shown from the above formula, changing optical distance L can
Change illumination the ring of light annulus internal-and external diameter, due to annulus internal-and external diameter difference be effective light passing diameter D0, therefore user can according to
The adjustable optical distance L of size of object 3 is surveyed so that the internal-and external diameter of the ring of light is matching, there is biggish applicability.Wherein,
Module 6 can be occurred at a distance from spectral module 2 and/or spectral module 2 by adjusting diffraction light-free by adjusting optical distance L
With realize at a distance from object under test 3.
Embodiment five
The difference of the present embodiment five and above-described embodiment four with when further including convergence in annular coaxial light-source generation device
When lens 7, this method can be the following steps are included: module 6 and plus lens occur for adjustment diffraction light-free before step S40
7 optical distance L ' with adjust coaxial annular light beam illumination the ring of light ring of light width.
Specifically, the light beam simulation comparison effect after increasing plus lens 7 can be as shown in fig. 7, chart below in Fig. 7
What is shown is after increasing plus lens 7, and light beam is more concentrated, Tu Genggao the upper surface of in brightness of illumination ratio Fig. 7.In addition, changing nothing
The distance L ' of module 6 and plus lens 7 occurs for diffraction light, and the width t of the illumination ring of light can be changed；Distance L ' is bigger, the width of the ring of light
Degree is wider, and distance L ' is smaller, and the width of the ring of light is narrower, as shown in figure 8, being below to subtract above to increase distance L ' index path afterwards
The index path of small distance L '；Accordingly, the floor map of the ring of light is illuminated as shown in figure 9, the annulus on the left side is Fig. 9 above figure
The ring of light is illuminated, the annulus on the right is the illumination ring of light of figure below Fig. 9, i.e. distance L ' is smaller, and the width t of the ring of light is narrower.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Those familiar with the art within the technical scope of the present application, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should all cover within the scope of protection of this application.Therefore, the protection scope of the application should be with right
It is required that protection scope subject to.
Claims (10)
1. a kind of annular coaxial light-source generation device, which is characterized in that including the light emitting module, collimating module, nothing set gradually
Module occurs for diffraction light and spectral module, the optical axis of the light emitting module spread out with the optical axis of the collimating module and the nothing
The optical axis for penetrating light generation module is on same straight line；Wherein,
The light emitting module is for providing light beam；
The collimating module is for collimating to obtain directional light the light beam；
The directional light generates the salt free ligands ring of light after module occurs for the diffraction light-free；
The spectral module is used to the salt free ligands ring of light reflexing to object under test, provides annular coaxial with measuring targets
The illumination of light source；
Wherein, module occurs for the diffraction light-free and the optical distance L of the object under test is greater than diffraction light-free generation mould
The maximum the non diffracting distance Zmax of block；
And the module adjustable and/or described spectral module and institute at a distance from the spectral module occur for the diffraction light-free
The distance for stating object under test is adjustable.
2. annular coaxial light-source generation device as described in claim 1, which is characterized in that described device further includes that convergence is saturating
Mirror, the plus lens are located at diffraction light-free and occur between module and spectral module, and its optical axis and the diffraction light-free occur
The light shaft coaxle of module.
3. annular coaxial light-source generation device as described in claim 1, which is characterized in that the collimating module includes several
A lens.
4. annular coaxial light-source generation device as described in claim 1, which is characterized in that module packet occurs for the diffraction light-free
Axicon mirror is included.
5. annular coaxial light-source generation device as described in claim 1, which is characterized in that the spectral module includes semi-transparent
Reflective mirror or dichroscope.
6. annular coaxial light-source generation device as described in claim 1, which is characterized in that the optical axis of the light emitting module and institute
The angle for stating the light-splitting device of spectral module is 45 °.
7. a kind of NI Vision Builder for Automated Inspection characterized by comprising described in any one of image-forming module and claim 1-6
Annular coaxial light-source generation device, wherein
The image-forming module is for shooting object under test.
8. NI Vision Builder for Automated Inspection as claimed in claim 7, which is characterized in that the optical axis of the image-forming module and the luminous mould
The optical axis of block is vertical.
9. a kind of application method of NI Vision Builder for Automated Inspection characterized by comprising
The light beam that light source module issues is carried out beam-expanding collimation to obtain directional light by collimating module；
Diffraction light-free occurs module and the directional light received is become the salt free ligands ring of light；
Spectral module reflexes to the salt free ligands ring of light on object under test, to illuminate object under test；
Image-forming module shoots the object under test after illumination.
10. application method as claimed in claim 9, which is characterized in that in the image-forming module to the object under test after illumination
Before the step of being shot, further includes:
Adjust the diffraction light-free occur module with the spectral module at a distance from and/or the spectral module with it is described to
The distance of object is surveyed, to adjust the size for the ring of light for illuminating the object under test.
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| CN114371168A (en) * | 2021-12-31 | 2022-04-19 | 大连理工大学 | Machine vision illumination design method based on reflected illumination calculation |
| CN114371168B (en) * | 2021-12-31 | 2023-10-13 | 大连理工大学 | Machine vision illumination design method based on reflection illuminance calculation |
| CN115900557A (en) * | 2022-10-24 | 2023-04-04 | 长园视觉科技(珠海)有限公司 | Generation device of approximate diffraction-free white light line light source |
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Application publication date: 20190618 |