CN111024713A - Rotatable light source for surface defect detection - Google Patents
Rotatable light source for surface defect detection Download PDFInfo
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- CN111024713A CN111024713A CN201911373719.9A CN201911373719A CN111024713A CN 111024713 A CN111024713 A CN 111024713A CN 201911373719 A CN201911373719 A CN 201911373719A CN 111024713 A CN111024713 A CN 111024713A
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- light source
- laser light
- imaging unit
- surface defect
- laser
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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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
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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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
- G01N2021/8835—Adjustable illumination, e.g. software adjustable screen
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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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
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- Biochemistry (AREA)
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Signal Processing (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention discloses a rotatable light source for surface defect detection, which comprises a rotating platform, an imaging unit and a plurality of laser light sources, wherein the rotating platform is provided with a plurality of light sources; the rotating platform is provided with a through hole; the imaging unit is arranged in the through hole of the rotating platform; each laser light source is connected with the rotating platform, the included angle between the emergent light of each laser light source and the central axis of the imaging unit is different, and the center of the light spot generated by each laser light source on the product to be measured is positioned on the central axis of the imaging unit. According to the invention, the plurality of laser light sources with different emergent light angles are fixed on the rotatable rotary table, so that light spots formed by emergent light rays of the laser light sources are all positioned on the central axis of the imaging unit, the defect imaging of the plurality of laser light sources with different angles is more favorable than that of a single light source in the detection, the automatic rotation and adjustment of the laser light sources can reduce or replace the rotary motion of a product to be detected, the position precision of the product to be detected is improved, and the surface defect position is more accurately locked.
Description
Technical Field
The invention belongs to the field of industrial intelligent detection application of machine vision, and particularly relates to a rotatable light source for surface defect detection.
Background
With the continuous development of production modernization and the technological progress, the market of precision instruments is gradually expanding, and higher requirements are also made on the performance of the instruments. The surface flaws of important elements of the precision instrument have great precision and stability to the system, so that enterprises have increasingly strict control on the surface precision of the precision instrument.
At present, a non-contact detection method of a light scattering effect is adopted for detecting surface defects of a plurality of precision instruments, but scattered light of some defects under the irradiation of incident light at a certain angle is too weak to enter an imaging system, so that a detection light source is required to provide an adjustable angle. At present, most of detection equipment adopts a single laser light source, the light source and a microscopic imaging system are separated and fixed, and a multidimensional motion table is arranged at the bottom of a product to be detected to realize bidirectional translation reciprocating motion and rotary motion. The method is easy to generate larger deviation at the surface flaw position, and meanwhile, the time consumption is longer when the global surface flaw with a larger area is detected due to the fact that the bottom of the method has rotary motion.
Disclosure of Invention
In order to solve the problems, the invention provides a rotatable light source for surface defect detection, wherein a plurality of laser light sources with different emergent light angles are fixed on a rotatable rotary table, light spots formed by emergent light rays of the laser light sources are positioned on the central axis of an imaging unit, and the rotation of the rotary table is utilized to drive the laser light sources to rotate, so that the laser light sources with different angles are more favorable for defect imaging in detection than a single light source, the automatic rotation of the laser light sources can be adjusted, the rotary motion of a product to be detected can be reduced or replaced, the position precision of the product to be detected is improved, and the surface defect position can be locked more accurately.
In order to achieve the technical purpose and achieve the technical effects, the invention is realized by the following technical scheme:
a rotatable light source for surface defect detection, comprising:
the rotating platform is provided with a through hole;
the imaging unit is arranged in the through hole of the rotating platform;
the laser imaging device comprises a plurality of laser light sources, wherein each laser light source is connected with the rotating platform, the included angle between the emergent light of each laser light source and the central axis of the imaging unit is different, and the centers of light spots generated by each laser light source on a product to be measured are all located on the central axis of the imaging unit.
Optionally, the rotation stage comprises:
a drive motor;
the rotary table top is provided with a through hole;
and the worm gear structure is respectively connected with the driving motor and the rotary table board and is driven by the driving motor to drive the rotary table board to rotate.
Optionally, the rotating table further comprises a fixed table top disposed opposite to the rotating table top; the imaging unit is connected with the fixed table top.
Optionally, a fixing sleeve is sleeved outside the imaging unit, the imaging unit and the fixing sleeve are movably connected, and the fixing sleeve is connected with the fixing table top.
Optionally, the laser light source comprises:
a laser;
the laser light source sleeve is sleeved on the outer side of the laser and is coaxially arranged;
the angle support is respectively connected with the rotating table and the laser light source sleeve, so that the included angle between the emergent light of the laser light source and the central axis of the imaging unit is a set degree.
Optionally, the angle bracket is an unfolded L-shaped plate, and an unfolding angle of the unfolded L-shaped plate is 90 ° to the emergent light of the laser light source.
Optionally, the angle bracket comprises a first section and a second section which are connected in sequence, and the first section is provided with an opening for connecting with the rotating table.
Optionally, the rotatable light source for surface defect detection includes 3 laser light sources, respectively:
the included angle between the emergent ray of the first laser light source and the central axis of the imaging unit is 60 degrees;
the included angle between the emergent ray of the second laser light source and the central axis of the imaging unit is 50 degrees;
and the angle between the emergent ray of the third laser light source and the central axis of the imaging unit is 45 degrees.
Optionally, the rotating table is provided with equally spaced through holes along an axial direction thereof for mounting the laser light source.
Compared with the prior art, the invention has the beneficial effects that:
according to the rotatable light source for surface defect detection, the plurality of laser light sources with different emergent light angles are fixed on the rotatable rotary table, light spots formed by emergent light rays of the laser light sources are all positioned on the central axis of the imaging unit, and the laser light sources are driven to rotate by utilizing the rotation of the rotary table, so that the defect imaging of the laser light sources with different angles is more facilitated than that of a single light source in the detection process, the automatic rotation of the laser light sources can be adjusted, the rotary motion of a product to be detected can be reduced or replaced, the position precision of the product to be detected is improved, and the position of a surface defect is more accurately locked.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
FIG. 1 is an overall block diagram of a rotatable light source according to an embodiment of the present invention;
FIG. 2 is a block diagram of a turntable according to an embodiment of the present invention;
FIG. 3 is a block diagram of a 60 laser source according to an embodiment of the present invention;
FIG. 4 is a schematic view of laser beams of 3 different angles according to an embodiment of the present invention;
in the figure, 1: an imaging unit; 2: a rotating table; 2.1: a drive motor; 2.2: a worm and gear structure; 2.3: rotating the table top; 3: fixing the sleeve 4: a central axis of the imaging unit; 5: a first laser light source; 5.1: the device comprises a laser, a 5.2 laser fixing sleeve and a 5.3-angle bracket; 6: a second laser light source; 7: a third laser light source; 8: a product to be tested; 9: and a through hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
As shown in fig. 1-4, the present invention provides a rotatable light source for surface defect detection, comprising: a rotating table 2, an imaging unit 1 and a plurality of laser light sources;
the rotating platform 2 is provided with a through hole;
the imaging unit 1 is arranged in a through hole of the rotating platform 2; in a specific implementation, the imaging unit 1 may adopt a microscopic imaging system;
each laser light source with revolving stage 2 links to each other, forms multi-angle adjustable laser light source, each laser light source's emergent ray with the contained angle between the central axis 4 of imaging unit is different, and the center of the facula that each laser light source produced on the product 8 that awaits measuring all is located the central axis 4 of imaging unit, and the laser light source distance of each different angle is highly unanimous from waiting to detect the product, guarantees follow-up reliability of coordinating microscopic imaging system and other motion system again.
In a specific embodiment of the present invention, the rotary table 2 comprises:
a drive motor 2.1; in specific implementation, the driving motor 2.1 can adopt a stepping motor;
a rotary table top 2.3 provided with a through hole for accommodating the imaging unit 1;
and the worm gear structure 2.2 is respectively connected with the driving motor 2.1 and the rotary table board 2.3, and is driven by the driving motor 2.1 to drive the rotary table board 2.3 to rotate so as to drive each laser light source to rotate in the horizontal direction. The structure of the worm gear structure 2.2 is the prior art, and the invention is not limited in particular;
in a particular embodiment of the invention, the rotating table 2 further comprises a fixed table top (not shown in the figures) arranged opposite to the rotating table top 2.3; the imaging unit 1 is connected with the fixed table top.
In a specific embodiment of the present invention, a fixed sleeve 3 is sleeved outside the imaging unit 1, and is movably connected to the fixed sleeve 3, and the fixed sleeve 3 is connected to the fixed table top.
In a specific embodiment of the present invention, the laser light source includes:
the laser device 5.1, the whole laser device 5.1 is cylindrical;
the laser light source sleeve 5.2 is sleeved on the outer side of the laser 5.1, is coaxially arranged and in clearance fit, and is matched with the peripheral set screws to fix the position of the laser 5.1, so that the fixed position of the laser can be manually adjusted;
angle support 5.3, respectively with revolving stage 2 and laser light source sleeve 5.2 link to each other for laser light source's emergent ray with the contained angle between the central axis 4 of imaging unit is for setting for the number of degrees, at the concrete implementation in-process, laser instrument fixed sleeve 5.2 and angle support 5.3 adopt transition fit, and the both sides are fixed with the bolt.
In a specific embodiment of the present invention, the angle bracket 5.3 is an unfolded L-shaped plate, and the unfolding angle of the unfolded L-shaped plate is 90 ° to the outgoing light of the laser light source; the size of the angle support 5.3 is calculated according to the rotary table top 2.3 and the fixed position, and the calculation ensures that the light of each laser light source can be converged together, meanwhile, the convergence center is on the same axis with the imaging unit 1, and the size of each angle support 5.3 in the axial direction is equal.
In a particular embodiment of the invention, the angle bracket 5.3 comprises a first section and a second section connected in series, the first section being provided with an opening for connection to the turntable 2.
In a specific embodiment of the present invention, the rotatable light source for surface defect detection comprises 3 laser light sources, respectively:
the included angle between the emergent ray of the first laser light source 5 and the central axis 4 of the imaging unit is 60 degrees;
the angle between the emergent ray of the second laser light source 6 and the central axis 4 of the imaging unit is 50 degrees;
the angle between the emergent ray of the third laser light source 7 and the central axis 4 of the imaging unit is 45 degrees;
meanwhile, the L-shaped spread angles in the 3 fixed angle brackets corresponding to the first laser light source 5, the second laser light source 6 and the third laser light source 7 are 135 °, 130 ° and 120 °, respectively.
In a specific embodiment of the present invention, the rotating platform 2 is provided with through holes 9 at equal intervals along the axial direction thereof, and different laser light sources can be fixed at different positions of the through holes by bolts, thereby facilitating adjustment.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A rotatable light source for surface defect detection, comprising:
the rotating platform is provided with a through hole;
the imaging unit is arranged in the through hole of the rotating platform;
the laser imaging device comprises a plurality of laser light sources, wherein each laser light source is connected with the rotating platform, the included angle between the emergent light of each laser light source and the central axis of the imaging unit is different, and the centers of light spots generated by each laser light source on a product to be measured are all located on the central axis of the imaging unit.
2. A rotatable light source for surface defect detection as claimed in claim 1, wherein: the rotating table includes:
a drive motor;
the rotary table top is provided with a through hole;
and the worm gear structure is respectively connected with the driving motor and the rotary table board and is driven by the driving motor to drive the rotary table board to rotate.
3. A rotatable light source for surface defect detection as claimed in claim 2, wherein: the rotating platform also comprises a fixed platform surface which is arranged opposite to the rotating platform surface; the imaging unit is connected with the fixed table top.
4. A rotatable light source for surface defect detection as claimed in claim 3, wherein: the outside cover of formation of image unit is equipped with fixed sleeve, for the activity links to each other between the two, fixed sleeve with fixed mesa links to each other.
5. A rotatable light source for surface defect detection as claimed in claim 1, wherein: the laser light source includes:
a laser;
the laser light source sleeve is sleeved on the outer side of the laser and is coaxially arranged;
the angle support is respectively connected with the rotating table and the laser light source sleeve, so that the included angle between the emergent light of the laser light source and the central axis of the imaging unit is a set degree.
6. A rotatable light source for surface defect inspection according to claim 5, wherein: the angle support is an unfolded L-shaped plate, and the unfolding angle of the unfolded L-shaped plate and the emergent light of the laser light source form 90 degrees.
7. A rotatable light source for surface defect inspection according to claim 6, wherein: the angle support comprises a first section and a second section which are sequentially connected, wherein the first section is provided with an opening and is used for being connected with the rotating table.
8. A rotatable light source for surface defect detection as claimed in claim 1, wherein: the rotatable light source for surface defect detection comprises 3 laser light sources, which are respectively:
the included angle between the emergent ray of the first laser light source and the central axis of the imaging unit is 60 degrees;
the included angle between the emergent ray of the second laser light source and the central axis of the imaging unit is 50 degrees;
and the angle between the emergent ray of the third laser light source and the central axis of the imaging unit is 45 degrees.
9. A rotatable light source for surface defect detection as claimed in claim 1, wherein: the rotating table is provided with through holes at equal intervals along the axial direction of the rotating table and used for installing laser light sources.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911373719.9A CN111024713A (en) | 2019-12-27 | 2019-12-27 | Rotatable light source for surface defect detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911373719.9A CN111024713A (en) | 2019-12-27 | 2019-12-27 | Rotatable light source for surface defect detection |
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| Publication Number | Publication Date |
|---|---|
| CN111024713A true CN111024713A (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911373719.9A Pending CN111024713A (en) | 2019-12-27 | 2019-12-27 | Rotatable light source for surface defect detection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114459379A (en) * | 2022-03-01 | 2022-05-10 | 长春财经学院 | Five-axis flexible detection platform and detection method |
| CN114623772A (en) * | 2022-03-01 | 2022-06-14 | 长春财经学院 | Four-axis online detection flexible platform and detection method for machined parts |
-
2019
- 2019-12-27 CN CN201911373719.9A patent/CN111024713A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114459379A (en) * | 2022-03-01 | 2022-05-10 | 长春财经学院 | Five-axis flexible detection platform and detection method |
| CN114623772A (en) * | 2022-03-01 | 2022-06-14 | 长春财经学院 | Four-axis online detection flexible platform and detection method for machined parts |
| CN114459379B (en) * | 2022-03-01 | 2022-09-30 | 长春财经学院 | Five-axis flexible detection platform and detection method |
| CN114623772B (en) * | 2022-03-01 | 2022-11-04 | 长春财经学院 | Four-axis online detection flexible platform and detection method for machined parts |
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