CN113137936A - Device applied to high-speed line scanning detection and detection method thereof - Google Patents
Device applied to high-speed line scanning detection and detection method thereof Download PDFInfo
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- 230000003287 optical effect Effects 0.000 abstract description 3
- 238000011179 visual inspection Methods 0.000 abstract 1
- 230000004907 flux Effects 0.000 description 11
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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Abstract
本发明属于机器视觉技术领域，具体公开了一种应用于高速线扫检测的装置及其检测方法，包括平行光源装置、分光镜、背光源和相机，所述分光镜呈倾斜设置于所述平行光源装置一端，所述分光镜、所述背光源和所述相机呈一字排列。该装置使用平行光源装置的远心光路设计，出射光线平行度高且具有超高亮度的特点，可以使镜头光线通光量更多，增加了光效利用率，降低所需相机采集曝光时间，大幅度提升视觉检测效率。
The invention belongs to the technical field of machine vision, and specifically discloses a device applied to high-speed line scan detection and a detection method thereof, comprising a parallel light source device, a beam splitter, a backlight source and a camera. At one end of the light source device, the beam splitter, the backlight source and the camera are arranged in a line. The device uses the telecentric optical path design of the parallel light source device, the output light has the characteristics of high parallelism and ultra-high brightness, which can make the lens light pass more light, increase the light efficiency utilization rate, reduce the required camera acquisition and exposure time, and greatly The efficiency of visual inspection is greatly improved.
Description
Technical Field
The invention belongs to the technical field of machine vision, and particularly relates to a device applied to high-speed line scanning detection and a detection method thereof.
Background
With the rapid development of automatic optical detection technology, the market demands for detection stability and detection efficiency are higher and higher. During high-speed detection, the stability of visual imaging effect and the speed of detection are two important factors influencing the detection efficiency. For example, in the thermal detection of the flexible screen of the mobile phone, after the flexible screen is cut by laser, the area beside the cutting channel is melted due to the influence of the laser heat, and a slight bulge is generated. In order to evaluate the size of the bulge, a camera is required to capture the flexible screen of the mobile phone and image a slightly bulged heat affected zone for analysis, which has high requirements on the effect stability and the shooting speed of the shooting device.
In the prior art, the brightness and the directivity of the coaxial light source for the flexible screen heat detection of the mobile phone cannot be simultaneously achieved, and the existing coaxial light source has the defects of high brightness and poor directivity of the light source, needs to manually adjust the light source for multiple times, ensures that the directivity meets the shooting requirement, and has high operation difficulty and low image acquisition speed; or the directivity is good, but the brightness of the light source is low, so that the brightness of the light source lighting unit is insufficient, and the image acquisition is unclear.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the device and the detection method thereof applied to high-speed linear scanning detection are provided, have the characteristics of high brightness and good light directivity, can greatly improve the light flux entering a lens, increase the light utilization rate, shorten the exposure time and improve the visual detection efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
the device applied to high-speed line scanning detection comprises a parallel light source device, a spectroscope, a backlight source and a camera, wherein the spectroscope is obliquely arranged at one end of the parallel light source device, and the spectroscope, the backlight source and the camera are arranged in a line. Adopt telecentric optical path design, make the emergent light depth of parallelism high, make the light flux of camera lens more, reduce the required exposure time of camera collection, compare ordinary coaxial light, can reduce 13 times and expose to thereby promote visual detection efficiency by a wide margin.
Further, the parallel light source device comprises a fixed body and a fiber point light source arranged in the fixed body. The structural design effectively enhances the structural firmness of the whole device.
Further, the fixing body is used for enabling the divergence angle of the light to be less than or equal to 1 degree. The light that has guaranteed the light source output keeps parallelism and axiality high, increases the clear light volume of camera lens light, reduces required camera and gathers exposure time, compares ordinary coaxial light, can reduce 13 times and expose to thereby promote visual detection efficiency by a wide margin.
Furthermore, the fixing body comprises a first base body, a second base body and a third base body, wherein one end of the first base body is provided with a first connecting port, one end of the third base body is provided with a second connecting port corresponding to the first connecting port, two ends of the second base body are respectively connected with the first connecting port and the second connecting port, and the third base body extends and expands outwards along the light emergent direction to form an expansion port. The structural design ensures that the divergence angle of the light is less than or equal to 1 degree, improves the utilization rate of the light source, ensures that the light can be transmitted towards the same direction in the transmission process, has the reflection effect on the light by the inner walls of the first base body, the second base body and the third base body, can reduce the loss of the light in the transmission process, and improves the spot brightness of the light.
Furthermore, a heat dissipation device is arranged in the first base body and used for dissipating heat. The structural design effectively prolongs the service life of the parallel light source device and avoids the phenomenon that equipment fails due to excessive heat generated by the light source in the working process.
Further, the backlight is used for increasing the backlight quantity of the product to be detected. The purpose of increasing backlight is to assist a camera to shoot the outer contour of the product to be detected, so that the camera can conveniently position and capture the product to be detected.
Further, the distance between the upper end face of the backlight source and the lower end face of the product to be detected is 19.5 mm-20.5 mm. The structural design ensures that the light flux of the camera lens is large, and improves the quality of the outline image of the product to be detected shot by the camera.
Further, the distance between the lower end face of the spectroscope and the upper end face of the product to be detected is 9.5 mm-10.5 mm. Due to the structural design, the light flux of the camera lens is large, and the quality of the outline image of the product to be detected shot by the camera is improved.
Further, the distance between the end face of the camera lens and the upper end face of the product to be detected is 105-145 mm. Due to the structural design, the light flux of the camera lens is large, and the quality of the outline image of the product to be detected shot by the camera is improved.
Further, the camera is a 16K line camera. The 16K linear array camera has high resolution and can continuously acquire images of the flexible screen of the mobile phone without interruption; the mobile phone flexible screen which moves linearly is continuously collected, so that the image collection efficiency is improved.
Further, the lens of the camera is a 0.8-time telecentric lens. By adopting the 0.8-time telecentric lens, the definition of the acquired mobile phone flexible screen image can be improved, so that the visual detection efficiency is greatly improved.
The detection method applied to the high-speed line scanning adopts the device applied to the high-speed line scanning detection to carry out detection, and comprises the following steps:
step 1: adjusting the relative positions of the parallel light source device (1), the spectroscope (2), the backlight source (3) and the camera (4), and starting the parallel light source device (1) to enable light spots to fall in the middle of the visual field of the camera (4);
step 2: connecting the camera (4) with a computer in a matching way, starting camera acquisition software, and setting exposure time;
and step 3: the product (5) to be detected moves at a constant speed above the backlight source (3), and the camera (4) shoots the product (5) to be detected.
The camera (4) in the step 3 shoots the product (5) to be detected, and the shooting method specifically comprises the following steps:
step 3-1: the camera (4) positions the outer contour of the product (5) to be detected;
step 3-2: and the camera (4) continuously shoots the outer contour of the product (5) to be detected.
The invention has the beneficial effects that: the device comprises a parallel light source device, a spectroscope, a backlight source and a camera, wherein the spectroscope is obliquely arranged at one end of the parallel light source device, and the spectroscope, the backlight source and the camera are arranged in a line. The parallel light source device adopts the telecentric light path design, has the characteristics of high parallelism of emergent rays and ultrahigh brightness, can ensure that the light flux of the lens rays is more, increases the light efficiency utilization rate, reduces the required camera acquisition exposure time, and can reduce the exposure by 13 times compared with the common coaxial light, thereby greatly improving the visual detection efficiency.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus for high-speed line scan detection in embodiment 1 of the present invention.
Wherein:
1-a collimated light source device; 11-a stationary body; 111-a first substrate; 112-a second substrate; 113-a third substrate; 12-a heat sink;
2-a spectroscope;
3-a backlight source;
4-a camera;
5-products to be tested.
Detailed Description
As used in this specification and the appended claims, certain terms are used to refer to particular components, and it will be appreciated by those skilled in the art that a manufacturer may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail with reference to the following drawings and specific examples, but the present invention is not limited thereto.
Example 1
As shown in fig. 1, a device for high-speed line scanning detection includes a parallel light source device 1, a beam splitter 2, a backlight source 3 and a camera 4, wherein the beam splitter 2 is obliquely disposed at one end of the parallel light source device 1, and the beam splitter 2, the backlight source 3 and the camera 4 are arranged in a line. The parallel light source device 1 adopts a telecentric light path design, so that the parallelism of emergent light is high, and the rapid detection is convenient to realize. For example, when the flexible screen of the mobile phone is detected, the device can be used for detecting, imaging a slightly raised area caused by the flexible screen of the mobile phone, and quickly capturing a shot. Meanwhile, because the light ray parallelism that the device produced is high and have the characteristics of superelevation luminance, can make the light flux of camera lens more, reduce the required collection exposure time of camera 4, compare ordinary coaxial light, can reduce 13 times and expose to the sun to promote visual detection efficiency by a wide margin.
The spectroscope 2 is obliquely arranged at an angle of 45 degrees and is used for reflecting light rays emitted by the parallel light source device 1 to a product through the spectroscope 2, and the light rays are reflected by the product, pass through the spectroscope 2 and finally enter a lens of the camera 4.
Further, the collimated light source device 1 includes a fixing body 11 and a fiber point light source disposed in the fixing body 11. The structural design effectively enhances the structural firmness of the whole device.
Further, the fixing body 11 is used to make the divergence angle of light 1 deg. or less. The light that has guaranteed the light source output keeps parallelism and axiality high, increases the clear light volume of camera lens light, reduces required camera 4 and gathers exposure time, compares ordinary coaxial light, can reduce 13 times and expose to thereby promote visual detection efficiency by a wide margin.
Further, the fixing body 11 includes a first base 111, a second base 112 and a third base 113, one end of the first base 111 is provided with a first connection port, one end of the third base 113 is provided with a second connection port corresponding to the first connection port, two ends of the second base 112 are respectively connected to the first connection port and the second connection port, and the third base 113 extends and expands outwards along the light emitting direction to form an expansion port. The structural design ensures that the divergence angle of the light is less than or equal to 1 degree, improves the utilization rate of the light source, ensures that the light can be transmitted towards the same direction in the transmission process, has the reflection effect on the light by the inner walls of the first base body 111, the second base body 112 and the third base body 113, can reduce the loss of the light in the transmission process, and improves the spot brightness of the light.
Further, the first base 111 incorporates a heat sink 12, and the heat sink 12 dissipates heat. Due to the structural design, the service life of the parallel light source device 1 is effectively prolonged, and the phenomenon that equipment fails due to excessive heat generated by a light source in the working process is avoided.
Further, the backlight 3 is used to increase the amount of backlight of the product 5 to be detected. The purpose of increasing backlight is to assist the camera 4 to shoot the outer contour of the product 5 to be detected, so that the camera 4 can conveniently position and capture the product 5 to be detected.
Further, the distance between the upper end face of the backlight 3 and the lower end face of the product 5 to be detected is 19.5 mm-20.5 mm. Due to the structural design, the light flux of the lens of the camera 4 is large, and the quality of the outline image of the product 5 to be detected shot by the camera 4 is improved.
Further, the distance between the lower end surface of the spectroscope 2 and the upper end surface of the product 5 to be detected is 9.5 mm-10.5 mm. Due to the structural design, the light flux of the lens of the camera 4 is large, and the quality of the outline image of the product 5 to be detected shot by the camera 4 is improved.
Further, the distance between the end face of the lens of the camera 4 and the upper end face of the product 5 to be detected is 105 mm-145 mm. Due to the structural design, the light flux of the lens of the camera 4 is large, and the quality of the outline image of the product 5 to be detected shot by the camera 4 is improved.
Further, the camera 4 is a 16K line camera 4. The 16K linear camera 4 has high resolution and can continuously acquire images of the mobile phone flexible screen; the mobile phone flexible screen which moves linearly is continuously collected, so that the image collection efficiency is improved.
Further, the lens of the camera 4 is a 0.8-time telecentric lens. By adopting the 0.8-time telecentric lens, the definition of the acquired mobile phone flexible screen image can be improved, so that the visual detection efficiency is greatly improved.
The working principle of the device applied to high-speed line scanning detection is as follows: adjusting the relative positions of the parallel light source device 1, the spectroscope 2, the backlight source 3, the camera 4 and the product 5 to be detected, setting a corresponding detection program, connecting a computer, starting acquisition software of the camera 4, setting proper exposure time, then the parallel light source device 1 is started to enable the parallel light source device 1 to emit a group of high-brightness light rays with high parallelism and high coaxiality, the light rays are reflected on the surface of the workpiece to be detected through the total reflection action of the spectroscope 2, are reflected again through the surface of the workpiece to be detected and pass through the transmission action of the spectroscope 2, the light enters the camera 4 arranged above the workpiece to be detected, the backlight source 3 is utilized to increase the backlight quantity, the auxiliary camera 4 captures and shoots the outer contour of the product to be detected 5, the camera 4 is convenient to position to the product to be detected 5, the product to be detected 5 moves horizontally at a constant speed, and meanwhile the camera 4 is matched with the camera to capture the image of the product to be detected 5. The device utilizes the light-emitting characteristics of the ultra-bright parallel coaxial light and the parallel coaxial structure to greatly improve the light flux entering the lens, so that the contrast of the heat influence effect of the product 5 to be detected shot by the camera 4 is more obvious.
Example 2
The embodiment 2 provides a detection method applied to high-speed line scanning, which adopts the apparatus applied to high-speed line scanning detection in embodiment 1 to perform detection, specifically as follows:
step 1: adjusting the relative positions of the parallel light source device (1), the spectroscope (2), the backlight source (3) and the camera (4), and starting the parallel light source device (1) to enable the light spot to fall in the middle of the visual field of the camera (4);
step 2: connecting a camera (4) with a computer in a matching way, starting camera acquisition software, and setting exposure time;
and step 3: the product (5) to be detected moves at a constant speed above the backlight source (3), and the camera (4) shoots the product (5) to be detected.
The camera (4) in the step 3 shoots the product (5) to be detected, and the shooting method specifically comprises the following steps:
step 3-1: the camera (4) positions the outer contour of the product (5) to be detected;
step 3-2: the camera (4) continuously shoots the outer contour of the product (5) to be detected.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110483877.0A CN113137936A (en) | 2021-04-30 | 2021-04-30 | Device applied to high-speed line scanning detection and detection method thereof |
| PCT/CN2022/088960 WO2022228379A1 (en) | 2021-04-30 | 2022-04-25 | Device for use in high-speed line-scan detection, and detection method therefor |
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| CN202110483877.0A CN113137936A (en) | 2021-04-30 | 2021-04-30 | Device applied to high-speed line scanning detection and detection method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022228379A1 (en) * | 2021-04-30 | 2022-11-03 | 广东奥普特科技股份有限公司 | Device for use in high-speed line-scan detection, and detection method therefor |
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| CN116295019B (en) * | 2023-05-22 | 2023-08-15 | 中国石油大学(华东) | Automatic detection device for pipe threads of pipe |
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| WO2022228379A1 (en) | 2022-11-03 |
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