CN114018934A - Imaging system for detecting surface defects of arc-shaped metal - Google Patents
Imaging system for detecting surface defects of arc-shaped metal Download PDFInfo
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- CN114018934A CN114018934A CN202111295594.XA CN202111295594A CN114018934A CN 114018934 A CN114018934 A CN 114018934A CN 202111295594 A CN202111295594 A CN 202111295594A CN 114018934 A CN114018934 A CN 114018934A
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 65
- 239000002184 metal Substances 0.000 title claims abstract description 65
- 238000003384 imaging method Methods 0.000 title claims abstract description 41
- 230000007547 defect Effects 0.000 title claims abstract description 34
- 238000001514 detection method Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 4
- 150000002739 metals Chemical class 0.000 claims 3
- 238000007689 inspection Methods 0.000 description 6
- 238000011179 visual inspection Methods 0.000 description 5
- 230000001939 inductive effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008451 emotion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
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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
- G01N2021/8822—Dark field detection
- G01N2021/8825—Separate detection of dark field and bright field
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention discloses an imaging system for detecting defects on the surface of an arc-shaped metal, which comprises a combined light source device, an area array camera lens and an area array camera, wherein the combined light source device is arranged above the surface of the arc-shaped metal, the area array camera lens is arranged above the combined light source device, the area array camera is arranged above the area array camera lens, the combined light source device is formed by combining a plurality of LED strip light sources, the LED strip light sources are arranged into an arch, a gap is formed between each LED strip light source, and reflected light generated by the LED strip light sources on the surface of the arc-shaped metal enters the area array camera through the area array camera lens to form a bright field environment; weak reflected light existing on the arc-shaped metal surface between the gaps of the LED strip light source enters the area array camera through the lens of the area array camera to form a dark field environment. The system can solve the problems that the existing imaging system has small arc metal imaging area, large-area reflection occurs in imaging and small defects cannot be imaged.
Description
Technical Field
The invention relates to the technical field of surface defect detection, in particular to an imaging system for detecting surface defects of arc-shaped metal.
Background
The quality inspection of the surface of the arc-shaped metal is a key process in the production link of the arc-shaped metal and is directly related to the quality of the arc-shaped metal. At present, manual spot inspection is adopted in the arc metal industry, and an automatic quality inspection scheme is also adopted. The following problems exist in the manual visual inspection mode: (1) professional visual inspection personnel need to be trained; (2) meanwhile, the manual visual inspection has certain subjectivity, and the judgment capability of visual inspection personnel is influenced by factors such as self emotion and physical condition, so that false inspection and missed inspection can be caused; (3) the manual visual inspection is post-processing, and has no positive influence on the real-time whole process flow optimization. The existing automated quality inspection schemes also have some problems: the imaging area of the arc-shaped metal is small, the imaging area reflects light in a large area, and small defects cannot be imaged. Therefore, how to comprehensively and accurately acquire the image of the arc-shaped metal surface and realize an automatic detection technology so as to improve the quality of the arc-shaped metal is a subject of concern.
Disclosure of Invention
In order to solve the technical problems, the invention provides an imaging system for detecting the defects on the surface of the arc-shaped metal, which can solve the problems that the existing imaging system has small imaging area of the arc-shaped metal, large-area reflection occurs in imaging and small defects cannot be imaged.
In order to achieve the purpose, the invention provides the following technical scheme:
an imaging system for detecting defects on an arc-shaped metal surface comprises a combined light source device, an area array camera lens and an area array camera, wherein the combined light source device is arranged above the arc-shaped metal surface, the area array camera lens is arranged above the combined light source device, the area array camera is arranged above the area array camera lens, the combined light source device is formed by combining a plurality of LED strip light sources, the LED strip light sources are arranged into an arch, a gap is formed between each LED strip light source, and reflected light generated by the LED strip light sources on the arc-shaped metal surface enters the area array camera through the area array camera lens to form a bright field environment; weak reflected light existing on the arc-shaped metal surface between the gaps of the LED strip light source enters the area array camera through the lens of the area array camera to form a dark field environment.
The further technical scheme is that the distance between the LED strip-shaped light sources is adjustable so as to meet the detection requirement of the actual defect size.
The further technical scheme is that the brightness of the LED strip-shaped light source is adjustable so as to achieve the optimal bright and dark field imaging effect.
The further technical scheme is that the imaging system for detecting the surface defects of the arc-shaped metal further comprises an in-place sensor for judging whether the arc-shaped metal moves below the imaging system.
The further technical scheme is that the in-place sensor is a proximity inductive switch or a photoelectric inductive switch.
The technical scheme is that the imaging system for detecting the surface defects of the arc-shaped metal further comprises a controller and a display, the controller and the display are connected with the area array camera, the controller is used for controlling the area array camera to collect surface images of the arc-shaped metal, and the display is used for displaying the shot surface images of the arc-shaped metal.
The further technical scheme is that the area-array camera can directly control image acquisition by an in-place sensor signal, or the controller acquires the in-place sensor signal and then controls the camera to acquire images.
Compared with the prior art, the invention has the following beneficial effects:
the arc-shaped metal imaging area is large, and the defect detection rate is high; the imaging quality is high, the situation of massive light reflection cannot occur, and the defect detection rate is further improved; in addition, the alternating bright and dark field polishing mode of the invention can find fine defects more easily, and the detection rate of the fine defects is improved. The detection system of the invention can be used for detecting cylindrical dry batteries, lithium batteries and the like.
Drawings
Fig. 1 is an imaging system for detecting defects on an arc-shaped metal surface according to embodiment 1 of the present invention.
Fig. 2 is an imaging system for detecting defects on an arc-shaped metal surface according to embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description is further provided with reference to the accompanying drawings and specific embodiments.
Example 1
As shown in fig. 1, the invention provides an imaging system for detecting defects on an arc-shaped metal surface, which comprises a combined light source device, an area-array camera lens and an area-array camera, wherein the combined light source device is arranged above the arc-shaped metal surface, the area-array camera lens is arranged above the combined light source device, the area-array camera is arranged above the area-array camera lens, the combined light source device is formed by arranging 6 LED strip light sources into an arch, a gap is formed between each LED strip light source, and reflected light generated by the LED strip light sources on the arc-shaped metal surface enters the area-array camera through the area-array camera lens to form a bright field environment; weak reflected light existing on the arc-shaped metal surface between the gaps of the LED strip light source enters the area array camera through the lens of the area array camera to form a dark field environment. The distance between the LED strip light sources is adjustable so as to meet the detection requirement of the actual defect size, and the brightness of the LED strip light sources is adjustable so as to achieve the optimal bright and dark field imaging effect. And finishing image acquisition of the arc-shaped metal surface once within a preset time.
Example 2
As shown in fig. 2, the invention provides an imaging system for detecting defects on an arc-shaped metal surface, which comprises a combined light source device, an area-array camera lens and an area-array camera, wherein the combined light source device is arranged above the arc-shaped metal surface, the area-array camera lens is arranged above the combined light source device, the area-array camera is arranged above the area-array camera lens, the combined light source device is formed by arranging 6 LED strip light sources into an arch, a gap is formed between each LED strip light source, and reflected light generated by the LED strip light sources on the arc-shaped metal surface enters the area-array camera through the area-array camera lens to form a bright field environment; weak reflected light existing on the arc-shaped metal surface between the gaps of the LED strip light source enters the area array camera through the lens of the area array camera to form a dark field environment. The distance between the LED strip light sources is adjustable so as to meet the detection requirement of the actual defect size, and the brightness of the LED strip light sources is adjustable so as to achieve the optimal bright and dark field imaging effect. And finishing image acquisition of the arc-shaped metal surface once within a preset time. The imaging system for detecting the surface defects of the arc-shaped metal further comprises an in-place sensor for judging whether the arc-shaped metal moves below the imaging system or not, wherein the in-place sensor is a proximity inductive switch or a photoelectric inductive switch. The imaging system for detecting the surface defects of the arc-shaped metal further comprises a controller and a display, the controller and the display are connected with the area array camera, the controller is used for controlling the area array camera to collect surface images of the arc-shaped metal, and the display is used for displaying the surface images of the shot arc-shaped metal. The area array camera can acquire images under the direct control of signals of the in-place sensor, or the controller acquires signals of the in-place sensor and then controls the camera to acquire images.
Example 3
The working process of the acquisition system is as follows:
selecting 6 strip-shaped LED light sources with the same specification, combining the strip-shaped LED light sources into an arched light source with uniform gaps, placing the arched light source above 10mm of arc-shaped metal, and adjusting the brightness of the light source to proper brightness;
secondly, placing the area-array camera and the lens of the area-array camera at a position 150mm away from the arched light source;
step three, triggering a camera to take a picture when the proximity sensor senses that the arc-shaped metal is positioned below the imaging system;
and step four, the control device takes out the arc-shaped metal inner cavity image from the camera and transmits the image to the display to display the result.
Example 4
The other working mode of the acquisition system of the invention is as follows:
selecting 6 strip-shaped LED light sources with the same specification, combining the strip-shaped LED light sources into an arched light source with uniform gaps, placing the arched light source above 10mm of arc-shaped metal, and adjusting the brightness of the light source to proper brightness;
secondly, placing the area-array camera and the lens of the area-array camera at a position 150mm away from the arched light source;
step three, when the proximity sensor senses that the arc-shaped metal is positioned below the imaging system, the in-place signal is sent to the control device;
and step four, after the control device receives the in-place signal, sending a photographing signal to the camera, taking out the arc-shaped metal inner cavity image from the camera, and transmitting the arc-shaped metal inner cavity image to the display to display a result.
Although the present invention has been described herein with reference to the illustrated embodiments thereof, which are intended to be preferred embodiments of the present invention, it is to be understood that the invention is not limited thereto, and that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure.
Claims (7)
1. An imaging system for detecting defects of an arc-shaped metal surface is characterized by comprising a combined light source device, an area array camera lens and an area array camera, wherein the combined light source device is arranged above the arc-shaped metal surface, the area array camera lens is arranged above the combined light source device, the area array camera is arranged above the area array camera lens, the combined light source device is formed by combining a plurality of LED strip light sources, the LED strip light sources are arranged into an arch, a gap is formed between each LED strip light source, and reflected light generated by the LED strip light sources on the arc-shaped metal surface enters the area array camera through the area array camera lens to form a bright field environment; weak reflected light existing on the arc-shaped metal surface between the gaps of the LED strip light source enters the area array camera through the lens of the area array camera to form a dark field environment.
2. The imaging system for curved metal surface defect detection as claimed in claim 1, wherein the distance between the LED strip light sources is adjustable to meet actual defect size detection requirements.
3. The imaging system for detecting defects on an arc-shaped metal surface as claimed in claim 1, wherein the brightness of the LED strip light source is adjustable to achieve an optimal bright and dark field imaging effect.
4. The imaging system for detecting surface defects of arc-shaped metals according to claim 1, wherein the imaging system for detecting surface defects of arc-shaped metals further comprises an in-position sensor for determining whether the arc-shaped metals move to the position below the imaging system.
5. The imaging system for detecting defects on an arcuate metal surface as claimed in claim 4, wherein said in-position sensor is a proximity sensor switch or a photo sensor switch.
6. The imaging system for detecting the surface defects of the arc-shaped metal according to claim 1, further comprising a controller and a display, wherein the controller and the display are connected to the area array camera, the controller is used for controlling the area array camera to acquire the surface image of the arc-shaped metal, and the display is used for displaying the photographed surface image of the arc-shaped metal.
7. The imaging system for detecting defects on an arc-shaped metal surface according to claim 1, wherein the area-array camera can acquire the image directly through the in-place sensor signal or acquire the in-place sensor signal through the controller and then control the camera to acquire the image through the controller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111295594.XA CN114018934B (en) | 2021-11-03 | 2021-11-03 | Imaging system for arc-shaped metal surface defect detection |
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| CN202111295594.XA CN114018934B (en) | 2021-11-03 | 2021-11-03 | Imaging system for arc-shaped metal surface defect detection |
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| CN114018934A true CN114018934A (en) | 2022-02-08 |
| CN114018934B CN114018934B (en) | 2023-11-03 |
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