A diffuse reflection light source system and design method for visual inspection

A technology of visual inspection and light source system, which is applied in the field of diffuse reflection light source system, can solve problems such as uneven illumination and high cost of light source, achieve uniform illumination, improve detection accuracy, and improve illumination uniformity

Active Publication Date: 2021-04-27
CENT SOUTH UNIV
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Problems solved by technology

Most of the lighting sources at the present stage adopt the method of direct lighting, the illumination is uneven, easy to produce glare, etc., and some light sources made of light refraction or specular reflection are expensive.

Method used

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  • A diffuse reflection light source system and design method for visual inspection
  • A diffuse reflection light source system and design method for visual inspection
  • A diffuse reflection light source system and design method for visual inspection

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Experimental program
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Embodiment

[0101] Step 1: Establish a mathematical model of illuminance distribution on the target surface based on the combination of light sources.

[0102] see figure 1 , establish the spatial coordinate system of the lighting source, place the target plane on the XOY plane, and the center point of the rectangular target surface is at the origin, the edges are parallel to the X-axis and Y-axis respectively, and the axes of the four bar-shaped light sources are parallel to the X-axis and Y-axis respectively , and the center point coordinate y=0 or x=0. In the figure, α is the angle between the optical axis and the z-axis, β is the angle between the normal of the reflective surface and the light, and β 1 is the angle between the normal of the target surface and the reflected light, θ is the angle between the light and the optical axis, θ 1 is the angle between the reflected ray and the normal of the reflecting surface. Consider the ceramic tile whose target to be detected is 300×300m...

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Abstract

The invention discloses a diffuse reflection light source system and a design method for visual detection, which can obtain the shape of a diffuse reflection curved surface according to the size of a target illumination area, and effectively improve the illumination uniformity of the target area. On the basis of the rectangular array light source, the illuminance distribution of the reflective surface is solved, the light intensity distribution of the reflective surface is obtained according to the principle of energy conservation, the illuminance distribution formula of the target surface is obtained, and the coordinates of a series of discrete points on the reflective surface are obtained to obtain the reflective surface. The invention has sufficient theoretical basis, simple and practical mathematical modeling, and high calculation reliability. The light source system built according to the optimal structural parameters has the characteristics of uniform illumination, high energy utilization rate, and no blocking of the lens. It can effectively Improving the imaging quality of the target object in visual inspection has important practical significance for improving the detection accuracy.

Description

technical field [0001] The invention belongs to the technical field of lighting, and in particular relates to a diffuse reflection light source system and a design method for visual detection. Background technique [0002] my country is a big producer of ceramic tiles, but the products are mainly concentrated in the middle and low grades, with high costs and low profits. Improving product quality has become an important breakthrough for the development of my country's ceramic tile industry. Realizing the visual detection of the surface quality of ceramic tiles can effectively improve the efficiency and reliability of detection, and is conducive to strict quality control of products. Studying the surface light source design in the visual inspection of ceramic tiles can enable the visual system to obtain the best imaging quality, greatly reduce the difficulty of image processing, reduce the detection time, and improve the detection accuracy. Most of the lighting sources at th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/88G01N21/01
CPCG01N21/01G01N21/8806G01N2021/8812
Inventor 张怀亮彭玲罗永康俞胜
Owner CENT SOUTH UNIV
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