CN105508925A - Super-power LED annular oblique illumination light source for wire visual inspection - Google Patents

Super-power LED annular oblique illumination light source for wire visual inspection Download PDF

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Publication number
CN105508925A
CN105508925A CN201410503065.8A CN201410503065A CN105508925A CN 105508925 A CN105508925 A CN 105508925A CN 201410503065 A CN201410503065 A CN 201410503065A CN 105508925 A CN105508925 A CN 105508925A
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light source
super
power led
illumination
oblique illumination
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CN105508925B (en
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何永辉
唐劲松
彭铁根
宗德祥
张�杰
韩茂栋
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Abstract

The invention relates to the technical field of machine vision, in particular to a super-power LED annular oblique illumination light source for wire visual inspection. The super-power LED annular oblique illumination light source (3) comprises a plurality of LED light source modules (1) and an optical reflector (2), wherein the LED light source modules and the optical reflector are arranged on a periphery extending outwards with the axial center of a measured wire (8) as the center of the circle, illumination beams emitted by the LED light source modules are illuminated at the measured wire at an oblique illumination angle (a) after being reflected by the optical reflector, and an illumination annular band zone (7) with a certain width is formed in the axial direction of the measured wire; and the oblique illumination angle is an included angle formed between the main direction of the illumination beams and the radial surface of the measured wire. The LED light source modules comprise super-power LEDs (11) and optical systems (12), the optical systems (12) are axially symmetrical elliptic surface conjugation convergence optical systems, and the super-power LEDs are positioned at one focuses of the axially symmetrical elliptic surfaces of the optical systems.

Description

For the super-high-power LED annular oblique illumination light source of wire rod vision-based detection
Technical field
The present invention relates to a kind of technical field of machine vision, particularly relate to a kind of for managing, the super-high-power LED annular oblique illumination light source of rod, wire rod vision-based detection.
Background technology
In product quality detects, linear array, face battle array and annular light source are widely used.In order to realize the surface quality detection of pipe in steel and iron industry, rod, wire product, particularly for the surface quality vision-based detection of hot pipe, rod, wire product, overcome the impact of testee high temperature on imaging, light source must have superelevation illumination, and energy uniform irradiation is to the circumferential surface of pipe, rod, wire product.In addition, because the speed of production of pipe, rod, wire product is general all very fast, more than 120 meter per seconds can be reached for wire product maximum speed, scanning line frequency correspondingly during line-scan digital camera imaging is more than 100Khz, mean exposure time is less than 10us, imaging will it is also proposed high requirement to light illumination under so high scanning line frequency.
Chinese patent 00811935.X discloses a kind of optical viewing arrangement for observing high temp objects and method, the patent describe a kind of optical system for observing high temp objects, this system by electromagnetic radiation to this parts surface and detect through reflection part.The wavelength thrown light on based on this application and modulation, can observe the surface characteristics of these parts when not disturbing by spontaneous radiation.Chinese patent 200680032274.2 discloses the apparatus and method of the blemish on a kind of workpiece for detecting such as rolled/drawn metal bar, this invention describes a kind of relevant issues that can't harm surface defect detection for metallic flat thing, have employed the mode that many linear light sorurces carry out projecting, coordinate camera to carry out imaging.These patents all do not relate to the design of annular high illumination light source.
Summary of the invention
The object of the present invention is to provide a kind of super-high-power LED for wire rod vision-based detection annular oblique illumination light source, this lighting source adopts super-high-power LED device and optic axis symmetrical ellipse conjugate to converge technology, realizes high-speed rod annular inclination Uniform Illumination.
In order to realize above-mentioned technical purpose, the present invention adopts following technical scheme:
A kind of annular of the super-high-power LED for wire rod vision-based detection oblique illumination light source, comprise several LED light source module and optical mirror, described LED light source module and optical mirror along tested wire rod axial centre be center of circle line, outwards stretch one circumferentially arrange, the illumination beam launched of LED light source module after optical mirror reflection with oblique illumination angular illumination on tested wire rod, axially forming one at tested wire rod has the endless belt-shaped interval of the illumination of one fixed width; Described oblique illumination angle refers to the angle that illumination beam principal direction and tested wire rod sagittal plane are formed.
Further, described LED light source module comprises super-high-power LED and optical system, this optical system is axial symmetry oval calotte conjugation convergence optical system, this super-high-power LED is positioned at axial symmetry oval calotte focus place of optical system 12, and super-high-power LED light source is radiated on tested wire rod after optical system after the optical mirror reflection being positioned at described LED light source module opposite again.
Further, described LED light source module also comprises copper base and water-cooled sinker, copper base is high heat conduction low thermal resistance copper base, described super-high-power LED and optical system are installed on copper base, copper base is fixedly installed in water-cooled sinker, have Cooling Holes in water-cooled sinker, have in Cooling Holes through delivery port and the external cooling water of water inlet.
The present invention is directed to the surface quality detection of pipe in steel and iron industry, rod, wire product, propose a kind of employing super-high-power LED device and optic axis symmetrical ellipse conjugate convergence technology, realize the lighting source to high-speed rod annular inclination Uniform Illumination.The feature of lighting source of the present invention is: 1) adopt annular design structure, high illuminance LED is evenly arranged, and adopts water-cooling structure to cool; 2) adopt oval calotte speculum to realize assembling illumination, form high illumination ring illumination region on roundwood surface.
Lighting source of the present invention can in the axial endless belt-shaped interval of illumination forming an effective width and be not less than 20mm of detected product, digital camera or camera are arranged on the radial direction of illumination bright band, with detected product synchronized movement, imaging is carried out to detected object surface, realize the hot high-speed rod surface imaging that the time for exposure is less than below 10us, thus the detection realized its blemish, ensure that hot pipe, rod, the high accuracy of wire product surface quality, the undetected survey of nothing left.
Accompanying drawing explanation
Fig. 1 is the structural representation that testee and lighting source of the present invention, camera calibration receive;
Fig. 2 is super-high-power LED module structural representation of the present invention;
Fig. 3 is parabola collimated illumination principle schematic;
Fig. 4 is the convergence lighting theory schematic diagram of axial symmetry oval calotte speculum.
In figure: 1LED light source module, 2 optical mirrors, 3 lighting sources, 4 cameras, 5 camera installing and adjusting mechanisms, 6 protective covers, 7 light illumination districts (or detection zone), 8 tested wire rods; 11 super-high-power LEDs, 12 optical systems, 13 copper bases, 14 water-cooled sinkers, 15 cooling water intakes and delivery port.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
See Fig. 1, a kind of annular of the super-high-power LED for wire rod vision-based detection oblique illumination light source 3, comprise several LED light source module 1 and optical mirror 2, described LED light source module 1 and optical mirror 2 along tested wire rod 8 axial centre be center of circle line, outwards stretch one circumferentially arrange, the illumination beam that LED light source module 1 is launched is radiated on tested wire rod 8 with oblique illumination angle a after optical mirror 2 reflects, and axially forming one at tested wire rod 8 has the illumination of one fixed width endless belt-shaped interval 7; Described oblique illumination angle a refers to the angle that illumination beam principal direction and tested wire rod 8 sagittal plane are formed.
Camera 4 (or digital camera) is installed on camera installing and adjusting mechanism 5, and camera 4 is adjusted to and parallels with tested wire rod 8 sagittal plane, focuses on endless belt-shaped interval 7 detecting of being thrown light on by lighting source 3 of the present invention.The light that each super-high-power LED 11 light source sends, assembled by the axial symmetry oval calotte conjugation of optical system 12, illumination beam needed for formation, light beam is reflected by optical mirror 2, light beam is through band High Temperature Optical window protective cover 6, oblique illumination angle a is on request radiated at tested wire rod 8 region, and form light illumination district 7, this surround is one the endless belt-shaped interval of the illumination of one fixed width.
Lighting source 3 of the present invention adopts modularity design technology.Described LED light source module 1 comprises super-high-power LED 11, optical system 12, copper base 13 and water-cooled sinker 14, see Fig. 2, this optical system 12 is axial symmetry oval calotte conjugation convergence optical system, this super-high-power LED 11 is positioned at axial symmetry oval calotte focus place of optical system 12, is radiated on tested wire rod 8 after the optical mirror 2 of super-high-power LED 11 light source again through being positioned at described LED light source module 1 opposite after optical system 12 reflects.Because super-high-power LED power consumption is large, corresponding caloric value is also large, and LED light source module introduces the temperature control technology measures such as heat transfer efficiency is high, thermal capacitance is large copper base 13 and water-cooled sinker 14.Described 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, copper base 13 is fixedly installed in water-cooled sinker 14, has Cooling Holes in water-cooled sinker 14, has through delivery port and the external cooling water of water inlet 15 in Cooling Holes.
Optical system 12 of the present invention is axial symmetry oval calotte convergence optical systems, this optical system 12 is lighting source 3 key components of the present invention, by axial symmetry oval calotte amendment design, change traditional parabola far field convergence characteristics, realize the relation approaching the convergence of distance conjugation or irradiate.
The main feature that the present invention is used for the super-high-power LED annular oblique illumination light source of wire rod vision-based detection is the light that super-high-power LED is sent, and when bore is limited, efficiently can assembles and be irradiated to detected surface.
Below for the high-speed rod Product checking of certain enterprise, introduce the axial symmetry oval calotte speculum being applied to lighting source of the present invention.
(1) boundary condition
According to surperficial on-line detecting system general design requirement and the constraints to illuminator, restrained boundary condition super-high-power LED efficiently being converged to illumination reflector mainly contains following parameter:
1) LED light-emitting area is apart from wire surface distance A;
2) camber reflection aperture of mirror D;
3) focus is apart from curved surface vertex distance m.
Specific to high-speed rod surface detecting system, wherein A=300mm, D=30mm, m=2mm.
(2) limitation of traditional parabolic mirror is adopted
Parabola has the light that sent by its focal point F place light source through its surface reflection, and become parallel rays, project the characteristic of infinity, its lighting theory as shown in Figure 3.
From parabolical geometrical principle, this parallel nature is for ideal point light source.And actual light source is expansion source, all have a certain size, the light that focal plane off-axis point sends by parallel deviate optical axis characteristic, is dispersed to both sides after parabola.In order to totally keep parabola parallel radiation characteristic, this dispersion angle generally should not be greater than 5 °.So paraboloidal focal distance f can not be too little, demand fulfillment:
Wherein: a is super-high-power LED light-emitting area diameter, gets a=3mm herein.
So:
Thus by parabola normal equation y 2=4fx, obtaining required parabola equation is:
y 2＝68x(2)
According to constraints, curved surface actinal surface diameter D is no more than 30mm, and namely y=15mm substitution (2) formula obtains:
x = 15 2 68 = 3.3 mm
The x=3.3mm herein calculated, means that the paraboloidal degree of depth only can be taken as 3.3mm.Obviously, do not have use value.
(3) the convergence lighting theory of axial symmetry oval calotte speculum
The convergence lighting theory of axial symmetry oval calotte speculum as shown in Figure 4, if its major axis OA1=OA2=a, minor axis OB1=OB2=b, focus are apart from the distance OF1=OF2=c of center O point, so elliptic curve equation is:
x 2 a 2 + y 2 b 2 = 1 - - - ( 3 )
And c 2=a 2-b 2(4)
According to boundary condition, get c=150mm, a=152mm herein, then:
b = ( a 2 - c 2 ) = ( 152 2 - 150 2 ) = 24.57 mm
(3) formula that a, b value substituted into obtains elliptic curve equation and is:
x 2 152 2 + y 2 24.57 2 = 1 - - - ( 5 )
Consider camber reflection aperture of mirror D=30mm constraint, now y=15mm, (5) formula of substitution obtains:
x = 152 × 1 - ( 15 2 24.57 2 ) = 120.39 mm
Now, curved surface degree of depth d is:
d＝a-x＝152-120.39≈31.6mm
Meet the application requirement of curved surface degree of depth 30mm.
In addition, it should be noted that, for elliptic curve, two focal point F 1, F2 conjugate relation each other, be namely placed on the light source at focal point F 1 place, is imaged on focal point F 2 place by oval calotte.Therefore, relative to parabolic mirror, expansion light source can be focused at another focus by oval calotte speculum, has better adapted to the requirement of high-speed rod set a distance illumination.
As shown in Figure 4, the ellipse convergence lighting theory of employing has X-axis symmetrical feature, the non-triaxial ellipsoid curved surface of the curved reflector therefore determined, but two-dimentional ellipsoid curve around the axial symmetry oval calotte that X-axis rotates a circle obtained, and curved surface bore is D=30mm, and corresponding curved surface degree of depth d is 31.6mm.
Lighting source of the present invention is for the surface quality detection of pipe, rod, wire product in steel and iron industry, propose a kind of employing super-high-power LED device and optic axis symmetrical ellipse conjugate convergence technology, realize the technology to high-speed rod annular inclination Uniform Illumination.In the axial endless belt-shaped interval of illumination forming an effective width and be not less than 20mm of detected product, digital camera (or camera) is arranged on the radial direction of illumination bright band, with detected product synchronized movement, imaging is carried out to detected object surface, realize the detection to its blemish.
These are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention, therefore, all any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. the annular of the super-high-power LED for a wire rod vision-based detection oblique illumination light source, it is characterized in that: comprise several LED light source module (1) and optical mirror (2), described LED light source module (1) and optical mirror (2) are center of circle line along tested wire rod (8) axial centre, one of outside stretching, extension is circumferentially arranged, the illumination beam that LED light source module (1) is launched is radiated on tested wire rod (8) with oblique illumination angle (a) after optical mirror (2) reflection, axially form one at tested wire rod (8) and have the endless belt-shaped interval of the illumination of one fixed width (7), described oblique illumination angle (a) refers to the angle that illumination beam principal direction and tested wire rod (8) sagittal plane are formed.
2. super-high-power LED annular oblique illumination light source according to claim 1, it is characterized in that: described LED light source module (1) comprises super-high-power LED (11) and optical system (12), this optical system (12) is axial symmetry oval calotte conjugation convergence optical system, this super-high-power LED (11) is positioned at axial symmetry oval calotte focus place of optical system (12), super-high-power LED (11) light source is radiated on tested wire rod (8) after optical system (12) after optical mirror (2) reflection being positioned at described LED light source module (1) opposite again.
3. super-high-power LED annular oblique illumination light source according to claim 2, it is characterized in that: described LED light source module (1) also comprises copper base (13) and water-cooled sinker (14), copper base (13) is high heat conduction low thermal resistance copper base, described super-high-power LED (11) and optical system (12) are installed on copper base (13), copper base (13) is fixedly installed in water-cooled sinker (14), water-cooled sinker has Cooling Holes in (14), has through delivery port and the external cooling water of water inlet (15) in Cooling Holes.
CN201410503065.8A 2014-09-26 2014-09-26 Super-high-power LED annular oblique illumination light source for wire rod vision-based detection Active CN105508925B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112506009A (en) * 2020-12-22 2021-03-16 厦门实锐科技股份有限公司 Ultraviolet LED parallel light optical device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001050905A (en) * 1999-08-16 2001-02-23 Ricoh Co Ltd Cylindrical body defect inspection apparatus
JP2001337046A (en) * 2000-05-30 2001-12-07 Mitsubishi Rayon Co Ltd Defect-inspection apparatus
CN103826096A (en) * 2012-11-15 2014-05-28 Og技术公司 Method and apparatus for uniformly focused ring light

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001050905A (en) * 1999-08-16 2001-02-23 Ricoh Co Ltd Cylindrical body defect inspection apparatus
JP2001337046A (en) * 2000-05-30 2001-12-07 Mitsubishi Rayon Co Ltd Defect-inspection apparatus
CN103826096A (en) * 2012-11-15 2014-05-28 Og技术公司 Method and apparatus for uniformly focused ring light

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112506009A (en) * 2020-12-22 2021-03-16 厦门实锐科技股份有限公司 Ultraviolet LED parallel light optical device

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