CN105508925B - Super-high-power LED annular oblique illumination light source for wire rod vision-based detection - Google Patents
Super-high-power LED annular oblique illumination light source for wire rod vision-based detection Download PDFInfo
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- CN105508925B CN105508925B CN201410503065.8A CN201410503065A CN105508925B CN 105508925 B CN105508925 B CN 105508925B CN 201410503065 A CN201410503065 A CN 201410503065A CN 105508925 B CN105508925 B CN 105508925B
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Abstract
The present invention relates to a kind of technical field of machine vision.A kind of super-high-power LED annular oblique illumination light source for wire rod vision-based detection（3）, including several LED light source modules（1）And optical mirror（2）, LED light source module and optical mirror are along tested wire rod（8）Axial centre be center of circle line, flex outward one it is provided circumferentially about, the illumination beam of LED light source module transmitting is after optical mirror reflects with oblique illumination angle（a）It is radiated on tested wire rod, being axially formed one in tested wire rod has the endless belt-shaped section of the illumination of one fixed width（7）；Oblique illumination angle refers to the angle that illumination beam principal direction is formed with tested wire rod sagittal plane.LED light source module includes super-high-power LED（11）And optical system（12）, which is that axial symmetry oval calotte is conjugated convergence optical system, and super-high-power LED is located at one focal point of axial symmetry oval calotte of optical system.
Description
Technical field
The present invention relates to a kind of technical field of machine vision more particularly to it is a kind of for managing, stick, wire rod vision-based detection it is super
High-power LED annular oblique illumination light source.
Background technology
In product quality detection, linear array, face battle array and annular light source are widely used.In order to realize steel and iron industry middle pipe,
The surface quality detection of stick, wire product overcomes especially for the surface quality vision-based detection of hot pipe, stick, wire product
Influence of the testee high temperature to imaging, light source must have superelevation illumination, and can uniform irradiation to pipe, stick, wire product
Circumferential surface.In addition, because the speed of production of pipe, stick, wire product is generally all very fast, it is reachable for wire product maximum speed
More than 120 meter per seconds, scanning line frequency when correspondingly line-scan digital camera is imaged is more than 100Khz, and mean exposure time is less than 10us,
Imaging also proposed high requirement to light illumination under so high scanning line frequency.
Chinese patent 00811935.X discloses a kind of optical viewing arrangement and method for observing high temp objects, this is specially
Profit describes a kind of optical system for observing high temp objects, which to the parts surface and detects electromagnetic radiation
Part through reflection.Wavelength based on the application illumination and modulation, can observe this in the case where not interfered by spontaneous radiation
The surface characteristics of component.Chinese patent 200680032274.2 discloses a kind of for detecting such as rolled/drawn metal bar
The device and method of surface defect on workpiece, the invention describe a kind of for the lossless surface defect detection of metallic flat object
Relevant issues, use the mode that a plurality of linear light sorurce is projected, and cooperation camera is imaged.These patents without reference to
To the design of annular high illumination light source.
Invention content
The purpose of the present invention is to provide a kind of super-high-power LED annular oblique illumination light for wire rod vision-based detection
Source, the lighting source converge technology using super-high-power LED device and optic axis symmetrical ellipse conjugate, realize to high-speed line
Material annular tilts Uniform Illumination.
In order to achieve the above technical purposes, the present invention adopts the following technical scheme that：
A kind of super-high-power LED annular oblique illumination light source for wire rod vision-based detection, including several LED light source moulds
Block and optical mirror, the LED light source module and optical mirror are center of circle line, flex outward along wire rod axial centre is tested
One it is provided circumferentially about, LED light source module transmitting illumination beam after optical mirror reflects with oblique illumination angle shine
It penetrates on tested wire rod, being axially formed one in tested wire rod has the endless belt-shaped section of the illumination of one fixed width；The inclination is shone
Firing angle degree refers to the angle that illumination beam principal direction is formed with tested wire rod sagittal plane.
Further, the LED light source module includes super-high-power LED and optical system, which is that axial symmetry is ellipse
Round surface is conjugated convergence optical system, which is located at one focal point of axial symmetry oval calotte of optical system 12,
Super-high-power LED light source shines through after the reflection of the optical mirror on the LED light source module opposite again after optical system
It penetrates on tested wire rod.
Further, the LED light source module further includes copper base and water-cooled sinker, and copper base is high heat conduction low thermal resistance copper
Substrate, the super-high-power LED and optical system are installed on copper base, and copper base is fixedly installed in water-cooled sinker, water cooling
It is provided with cooling hole in heat sink piece, has in cooling hole through the external cooling water of water outlet and water inlet.
The present invention is for steel and iron industry middle pipe, the surface quality detection of stick, wire product, it is proposed that a kind of to use super large work(
Rate LED component and optic axis symmetrical ellipse conjugate converge technology, realize the photograph that Uniform Illumination is tilted to high-speed rod annular
Mingguang City source.The present invention lighting source the characteristics of be：1) it uses annular design structure, high illumination LED to be evenly arranged, and uses water
Air-cooled structure is cooled down；2) it uses oval calotte speculum to realize and assembles illumination, high illumination ring illumination is formed on roundwood surface
Region.
The lighting source of the present invention can be axially formed the illumination ring that an effective width is not less than 20mm in detected product
The band-like section of shape, digital camera or camera are mounted on the radial direction of illumination bright band, synchronous with detected product movement to being detected
Subject surface is imaged, and time for exposure hot high-speed rod surface imaging below less than 10us is realized, to realize to it
The detection of surface defect ensure that hot pipe, stick, the high-precision of wire product surface quality, nothing left leak detection.
Description of the drawings
Fig. 1 is the structural schematic diagram that testee and lighting source of the invention, phase machine testing receive；
Fig. 2 is the super-high-power LED module structural schematic diagram of the present invention；
Fig. 3 is paraboloid collimated illumination principle schematic；
Fig. 4 is the convergence lighting theory schematic diagram of axial symmetry oval calotte speculum.
In figure：1LED light source modules, 2 optical mirrors, 3 lighting sources, 4 cameras, 5 camera installing and adjusting mechanisms, 6 protection
Cover, 7 light source lighting areas (or detection zone), 8 tested wire rods；11 super-high-power LEDs, 12 optical systems, 13 copper bases, 14 water-cooleds
Sinker, 15 cooling water intakes and water outlet.
Specific implementation mode
The invention will be further described in the following with reference to the drawings and specific embodiments.
Referring to Fig. 1, a kind of super-high-power LED annular oblique illumination light source 3 for wire rod vision-based detection, including several
LED light source module 1 and optical mirror 2, the LED light source module 1 and optical mirror 2 are along 8 axial centre of tested wire rod
Center of circle line, one flexed outward are provided circumferentially about, and the illumination beam that LED light source module 1 emits is after the reflection of optical mirror 2
It is radiated on tested wire rod 8 with oblique illumination angle a, an illumination annular for having one fixed width is axially formed in tested wire rod 8
Band-like section 7；The oblique illumination angle a refers to the angle that illumination beam principal direction is formed with 8 sagittal plane of tested wire rod.
Camera 4 (or digital camera) is installed on camera installing and adjusting mechanism 5, and camera 4 is adjusted to and tested wire rod 8
Sagittal plane is parallel, focuses on the endless belt-shaped section 7 illuminated by the lighting source 3 of the present invention and is detected.Each super large
The light that 11 light source of power LED is sent out is conjugated by the axial symmetry oval calotte of optical system 12 and is assembled, forms required photograph
Irradiating light beam, light beam are reflected by optical mirror 2, and light beam passes through band High Temperature Optical window protective cover 6, oblique illumination angle as required
Degree a is radiated at 8 region of tested wire rod, forms light source lighting area 7, which, which is one, has the illumination of one fixed width endless belt-shaped
Section.
The lighting source 3 of the present invention uses modularity design technology.The LED light source module 1 includes super high power
LED11, optical system 12, copper base 13 and water-cooled sinker 14, referring to Fig. 2, which is axial symmetry oval calotte
It is conjugated convergence optical system, which is located at one focal point of axial symmetry oval calotte of optical system 12, surpasses
11 light source of great power LED is reflected through the optical mirror 2 positioned at 1 opposite of the LED light source module again after optical system 12
After be radiated on tested wire rod 8.Since super-high-power LED power consumption is big, corresponding calorific value is also big, and LED light source module introduces
The temperature controls technical measures such as the copper base 13 and water-cooled sinker 14 that heat transfer efficiency is high, thermal capacitance is big.The copper base 13 is high heat conduction
Low thermal resistance copper base, super-high-power LED 11 and optical system 12 are installed on copper base 13, and copper base 13 is fixedly installed in water
Cold and hot sinker 14 is provided with cooling hole in water-cooled sinker 14, has in cooling hole through the external cooling water of water outlet and water inlet 15.
The optical system 12 of the present invention is axial symmetry oval calotte convergence optical system, which is of the invention
3 key component of lighting source is changed traditional paraboloid far field convergence characteristics, is realized by axial symmetry oval calotte amendment design
Approach the relationship that distance conjugation is assembled or irradiated.
The present invention for wire rod vision-based detection super-high-power LED annular oblique illumination light source be mainly characterized by make super large
The light that power LED is sent out can be assembled efficiently in the case of bore is limited and be irradiated to detected surface.
Below by taking the high-speed rod product testing of certain enterprise as an example, introduce ellipse applied to the axial symmetry of lighting source of the present invention
Round surface speculum.
(1) boundary condition
According to surface on-line detecting system general design requirement and to the constraints of lighting system, to super-high-power LED
Efficiently the restrained boundary condition of convergence illumination reflector mainly has following parameter：
1) LED light-emitting surfaces are away from wire surface distance A；
2) camber reflection aperture of mirror D；
3) focus is away from curved surface vertex distance m.
Specific to high-speed rod surface detecting system, wherein A=300mm, D=30mm, m=2mm.
(2) using the limitation of traditional parabolic mirror
Paraboloid has the light for sending out light source at its focus F through its surface reflection, becomes parallel rays, projects nothing
Poor remote characteristic, lighting theory are as shown in Figure 3.
By parabolical geometrical principle it is found that this parallel nature is for ideal point light source.And actual light source is
Expansion source, there is a certain size, and the light that focal plane off-axis point is sent out will deviate from parallel optical axis characteristic after paraboloid, to both sides
Diverging.Paraboloid parallel radiation characteristic, this dispersion angle is kept generally to should not exceed 5 ° in order to overall.Then, paraboloidal
Focal length f cannot be too small, needs to meet：
Wherein：A is super-high-power LED light-emitting surface diameter, takes a=3mm herein.
Then：
To by paraboloid normal equation y2=4fx, obtaining required paraboloid equation is：
y2=68x (2)
According to constraints, curved surface mouth face diameter D is no more than 30mm, i.e. y=15mm substitutes into (2) formula and obtains：
The x=3.3mm being calculated herein, it is meant that paraboloidal depth is only capable of being taken as 3.3mm.Obviously, without making
With value.
(3) the convergence lighting theory of axial symmetry oval calotte speculum
The convergence lighting theory of axial symmetry oval calotte speculum is as shown in figure 4, set its long axis OA1=OA2=a, short axle
The distance OF1=OF2=c of OB1=OB2=b, focus away from center O points, then elliptic curve equation be：
And c2=a2-b2 (4)
According to boundary condition, c=150mm, a=152mm are taken herein, then：
A, b value substitution (3) formula, which are obtained elliptic curve equation, is：
Consider the D=30mm constraints of camber reflection aperture of mirror, y=15mm, (5) formula of substitution obtain at this time：
At this point, curved surface depth d is：
D=a-x=152-120.39 ≈ 31.6mm
Meet the application requirement of curved surface depth 30mm.
In addition, it is necessary to explanation, for elliptic curve, two focus F1, F2 conjugate relation each other is placed on focus
Light source at F1 is imaged on by oval calotte at focus F2.Accordingly, with respect to parabolic mirror, oval calotte speculum
It can will expand light source and be focused at another focus, preferably adapt to the requirement of high-speed rod set a distance illumination.
As shown in Figure 4, the oval lighting theory of assembling of use has X-axis symmetrical feature, it is thus determined that curved reflector
Non- triaxial ellipsoid curved surface, but two-dimentional ellipsoid curveIt is oval around rotate a circle obtained axial symmetry of X-axis
Curved surface, and curved surface bore is D=30mm, corresponding curved surface depth d is 31.6mm.
The lighting source of the present invention is for steel and iron industry middle pipe, the surface quality detection of stick, wire product, it is proposed that a kind of
Technology is converged using super-high-power LED device and optic axis symmetrical ellipse conjugate, realizes and high-speed rod annular is tilted
The technology of even illumination.It is axially formed the endless belt-shaped section of illumination that an effective width is not less than 20mm, number in detected product
Word video camera (or camera) is mounted on the radial direction of illumination bright band, synchronous with detected product movement to be carried out to detected object surface
The detection to its surface defect is realized in imaging.
The above is merely preferred embodiments of the present invention, be not intended to limit the scope of the present invention, therefore, it is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention should be included in the protection model of the present invention
Within enclosing.
Claims (2)
1. a kind of super-high-power LED annular oblique illumination light source for wire rod vision-based detection, it is characterized in that：Including several
LED light source module（1）And optical mirror（2）, the LED light source module（1）And optical mirror（2）Along tested wire rod（8）
Provided circumferentially about, the LED light source module that axial centre is center of circle line, flexes outward（1）The illumination beam of transmitting is through optics
Speculum（2）Tested wire rod is radiated at oblique illumination angle a after reflection（8）On, in tested wire rod（8）Being axially formed one has
The endless belt-shaped section of illumination of one fixed width（7）；The oblique illumination angle a refers to illumination beam principal direction and tested wire rod
（8）The angle that sagittal plane is formed；
The LED light source module（1）Including super-high-power LED（11）And optical system（12）, the optical system（12）For axis pair
Oval calotte is claimed to be conjugated convergence optical system, the super-high-power LED（11）Positioned at the axial symmetry oval calotte of optical system (12)
One focal point, super-high-power LED（11）Light source passes through optical system（12）Afterwards again through being located at the LED light source module（1）It is right
The optical mirror in face（2）Tested wire rod is radiated at after reflection（8）On.
2. super-high-power LED annular oblique illumination light source according to claim 1, it is characterized in that：The LED light source module
（1）It further include copper base（13）With water-cooled sinker（14）, copper base（13）For high heat conduction low thermal resistance copper base, the super large work(
Rate LED（11）And optical system（12）It is installed on copper base（13）On, copper base（13）It is fixedly installed in water-cooled sinker
（14）, water-cooled sinker（14）It is inside provided with cooling hole, is had through water outlet and water inlet in cooling hole（15）External cooling water.
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| CN201410503065.8A CN105508925B (en) | 2014-09-26 | 2014-09-26 | Super-high-power LED annular oblique illumination light source for wire rod vision-based detection |
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