LIPO colloid imaging method based on infrared light source prism combined light path

Abstract

The invention relates to an LIPO colloid imaging method based on an infrared light source prism combined light path, and the method comprises the following steps: S1, enabling infrared light to penetrate through colloid: moving a to-be-detected product to be right below a 940nm infrared strip-shaped light source; the light source is triggered through the PLC, so that infrared light penetrates through the interior of the LIPO colloid and the bubble defect is lightened; s2, prism reflection imaging: the defect-containing light penetrating through the colloid is reflected by a triangular prism and enters an area-array camera lens; the camera collects images in a flying shooting mode; s3, multi-frame coverage detection: covering the whole side wall area of the LIPO colloid by exposing the combined image for multiple times; and outputting the position and area information of the bubble defect. According to the invention, the 940nm infrared light source penetrates through the LIPO colloid to image the internal bubbles, and the camera / light source parallel layout is realized by combining a triangular prism reflection light path, so that the problems that the internal defects of the colloid cannot be detected and the occupied space is large in the prior art are solved, and the detection accuracy and the equipment integration degree are improved.

Description

Technical Field

[0001] The present invention relates to the field of visual imaging detection technology, in particular to a LIPO colloid imaging method based on an infrared light source prism combined light path. Background Art

[0002] Existing automated optical inspection equipment for LIPO colloid defects mostly uses surface reflection imaging solutions using visible light sources. This approach can image surface defects and severe bubbles in LIPO colloids, but cannot image small bubbles within the LIPO colloid. Furthermore, in these solutions, the imaging system for the sidewalls often uses a camera with an optical path perpendicular to the sidewalls, which takes up a lot of space and is difficult to debug. Therefore, the drawbacks of the existing technology can be summarized as follows:

[0003] 1. Poor imaging effect: Conventional white light sources are difficult to penetrate LIPO colloids, and mild to moderate bubble defects cannot be imaged, which can easily lead to missed detection.

[0004] 2. Large space occupation: Since the area array camera needs to be arranged perpendicular to the side of the LIPO colloid, this layout requires a large amount of space for the mechanism, limiting the flexibility and adaptability of the detection equipment. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a LIPO colloid imaging method based on an infrared light source prism combined optical path, which solves the problem that tiny bubbles inside the LIPO colloid cannot be imaged and are difficult for the human eye to recognize, and realizes standardized detection of bubbles of multiple specifications.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a LIPO colloid imaging method based on an infrared light source prism combined light path, comprising the following steps:

[0007] S1. Infrared light penetrates the colloid: Move the product to be tested directly under a 940nm infrared bar light source; trigger the light source through the PLC to allow the infrared light to penetrate the interior of the LIPO colloid and highlight the bubble defects;

[0008] S2, Prism Reflection Imaging: The defective light penetrating the colloid is reflected by a triangular prism and enters the area array camera lens; the camera captures images in flying mode;

[0009] S3. Multi-frame coverage detection: Through multiple exposures and combined images, the entire LIPO colloid sidewall area is covered; the location and area information of the bubble defect is output.

[0010] Furthermore, in step 1 of the present invention, the light emitting size of the infrared light source is 80 mm × 30 mm, ensuring that the light evenly covers the colloid area.

[0011] Furthermore, the imaging process of the present invention is completed by an imaging system, and the imaging system includes:

[0012] Area array camera: frame rate 23FPS, resolution 2448×2048, pixel size 3.45μm;

[0013] Lens: 0.3x fixed focus lens, working distance 120mm;

[0014] Infrared bar light source: wavelength 940nm, luminous size 80mm×30mm, built-in diffuser;

[0015] Triangular prism: reflects the infrared light that penetrates the LIPO colloid to the camera lens;

[0016] PLC controller: Synchronously trigger the camera and light source exposure.

[0017] Furthermore, the infrared strip light source of the present invention uses high-power infrared LED lamp beads and cooperates with a diffuser plate to achieve uniform lighting.

[0018] Furthermore, the camera of the present invention works in a flying shooting mode, with a single shooting field of view of 28mm×23.6mm and a resolution of 11.5μm.

[0019] Furthermore, the triangular prism of the present invention is arranged below the lens of the area array camera, and the distance from the reflected light of the triangular prism to the camera lens is 60 mm; the distance between the product and the triangular prism is 60 mm.

[0020] Furthermore, the infrared strip light source of the present invention is arranged on the side of the triangular prism, and the height distance between the infrared strip light source and the product is 35 mm.

[0021] The beneficial effect of the present invention is to solve the defects existing in the background technology.

[0022] 1. Improve detection accuracy: This invention uses a customized infrared light source to image bubble defects, determine bubble location, area and other information, and achieve accurate bubble defect detection.

[0023] 2. Reasonable space design: Since side defects require sideways shooting, the present invention uses prisms to reflect light, so that the camera can be arranged parallel to the light source, which greatly improves the space utilization of the imaging system while maintaining the imaging effect.

[0024] 3. Improved production efficiency: Manual inspection requires the use of a high-brightness light source to penetrate the LIPO colloid and observe carefully. Most bubble defects are extremely subtle and difficult to discern with the naked eye, requiring a high level of observer proficiency. This invention achieves clear imaging of bubble defects and efficient AI detection, and can adjust the detection effect according to the defect specifications, achieving standardized detection of this type of defect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a layout diagram of the imaging system of the present invention;

[0026] Figure 2 This is a schematic diagram of the imaging optical path of the present invention;

[0027] Figure 3 It is a schematic flow chart of the method of the present invention;

[0028] In the figure: 1. Area array camera; 2. Lens; 3. Infrared strip light source; 4. Triangular prism; 5. Product. DETAILED DESCRIPTION

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0030] like Figure 1-Figure 3 The LIPO colloid imaging method based on the infrared light source prism combined optical path shown in the figure studies the LIPO colloid material and process principles, analyzes the causes and characteristics of bubbles in the LIPO colloid, and uses a customized wavelength infrared light source to penetrate the LIPO colloid and illuminate the bubbles, thereby imaging the defects.

[0031] Imaging system hardware layout Figure 2 As shown, the system consists of an area array camera 1, a lens 2, an infrared strip light source 3, and a triangular prism 4. During the inspection process, a product 5 moves directly below the infrared strip light source. Once the inspection area enters the field of view, a PLC triggers the camera, which in turn triggers the light source. 940nm infrared light penetrates from above the LIPO colloid and illuminates the internal bubble defects. The light is then reflected by the triangular prism and enters the lens, imaging the defects. The resulting multiple exposures combine to cover the entire inspection area of ​​the LIPO colloid's sidewall, enabling bubble defect imaging across the entire LIPO sidewall.

[0032] The optical configuration table of the imaging system is shown in the following table:

[0033]

[0034] Typically, LIPO colloid is poured around the periphery of the product. The thickness and width of the LIPO colloid are approximately 5mm. Bubbles are formed during the pouring process. Because air is not completely expelled, bubbles remain in the LIPO colloid after solidification, affecting the strength and airtightness of the product.

[0035] The white light source used in conventional solutions can only illuminate the surface of the LIPO colloid. The interior of the colloid is translucent and milky white, which makes it difficult to effectively penetrate and image the bubble defects.

[0036] Compared with conventional solutions, the 940nm wavelength infrared light used in this solution has lower scattering properties and high penetrability in certain materials. After testing, it can effectively penetrate the surface of LIPO colloid and clearly image bubble defects.

[0037] The camera captures images in a fly-by mode, requiring low exposure to minimize imaging defects. Therefore, high-power infrared LEDs are used in conjunction with a diffuser to ensure even light distribution over the LIPO colloid. The field of view for a single shot is designed to be 28mm x 23.6mm. Considering light edge attenuation, the light source's luminous area is designed to be 80mm x 30mm, ensuring uniform imaging of the LIPO colloid.

[0038] Therefore, this program has the following significant effects:

[0039] Reduce inspection costs: Only one area scan camera, one infrared strip light source, and one reflective prism are needed to detect LIPO colloid bubbles in products.

[0040] Reduced debugging difficulty: Only an area array camera and an infrared strip stroboscopic light source are required. The mechanism is compact, occupies little space, and the triggering method and working environment are relatively simple. It is also highly stable and easy to maintain.

[0041] 3. Obtain better defect detection results: Using infrared light source to penetrate LIPO colloid imaging bubble defects, greatly improving the algorithm detection accuracy.

[0042] The above description only describes specific embodiments of the present invention. Various examples do not limit the essential content of the present invention. After reading the description, ordinary technicians in the relevant technical field can make modifications or variations to the specific embodiments described above without departing from the essence and scope of the invention.

Claims

1. A LIPO colloid imaging method based on an infrared light source and prism combined optical path, characterized by: The following steps are included: S1. Infrared light penetrates the colloid: Move the product to be tested directly under a 940nm infrared bar light source; trigger the light source through the PLC, allowing the infrared light to penetrate the interior of the LIPO colloid and highlight the bubble defects; S2, Prism Reflection Imaging: The defective light penetrating the colloid is reflected by a triangular prism and enters the area array camera lens; the camera captures images in flying mode; S3. Multi-frame coverage detection: Through multiple exposures and combined images, the entire LIPO colloid sidewall area is covered; the location and area information of the bubble defect is output.

2. The LIPO colloid imaging method based on the infrared light source and prism combined light path according to claim 1, characterized in that: In step 1, the infrared light source has a light emission size of 80 mm × 30 mm to ensure that the light evenly covers the colloid area.

3. The LIPO colloid imaging method based on the infrared light source and prism combined optical path according to claim 1, characterized in that: The imaging process is completed by an imaging system, which includes: Area array camera: frame rate 23FPS, resolution 2448×2048, pixel size 3.45μm; Lens: 0.3x fixed-focus lens, working distance 120mm; Infrared bar light source: wavelength 940nm, luminous size 80mm×30mm, built-in diffuser; Triangular prism: reflects the infrared light that penetrates the LIPO colloid to the camera lens; PLC controller: Synchronously trigger the camera and light source exposure.

4. The LIPO colloid imaging method based on the infrared light source and prism combined light path according to claim 2, characterized in that: The infrared strip light source adopts high-power infrared LED lamp beads and cooperates with a diffuser plate to achieve uniform lighting.

5. The LIPO colloid imaging method based on the infrared light source and prism combined light path according to claim 2, characterized in that: The camera works in a flying mode, with a single-shot field of view of 28 mm × 23.6 mm and a resolution of 11.5 μm.

6. The LIPO colloid imaging method based on the infrared light source and prism combined optical path according to claim 2, characterized in that: The triangular prism is arranged below the lens of the area array camera, and the distance from the reflected light of the triangular prism to the camera lens is 60 mm; the distance between the product and the triangular prism is 60 mm.

7. The LIPO colloid imaging method based on the infrared light source and prism combined optical path according to claim 2, characterized in that: The infrared strip light source is arranged on the side of the triangular prism, and the height distance between the infrared strip light source and the product is 35 mm.

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