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Grating and defect detection and digital imaging device based on grating

A detection device and digital imaging technology, applied in measurement devices, diffraction gratings, optics, etc., can solve problems such as inability to image the entire surface, severe environmental reflection, and inability to detect the entire surface.

Pending Publication Date: 2022-05-27
上海塞普机电工程技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When reflecting imaging at a certain angle, the camera can only capture a partial target, and other targets on the surface cannot be captured, and the environment is severely reflected, and the entire surface cannot be imaged, and the entire surface cannot be detected.

Method used

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  • Grating and defect detection and digital imaging device based on grating
  • Grating and defect detection and digital imaging device based on grating
  • Grating and defect detection and digital imaging device based on grating

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The present embodiment is intended to provide a grating, the grating is a transparent but transparent flat object, and the planar object is covered with a continuous pattern between light and dark, the graphic may be of any shape of geometry in the form of light and dark composition of the figure, that is, any shape between light and dark may constitute the grating. Conforming to the above three physical characteristics of the planar object, i.e., the grating.

[0027] Wherein, the light and dark phase is the essential feature of the light grid, the continuous graphic between the light and dark may be a continuous graph between black and white.

[0028] Specifically, the graphics of the present embodiment may be a certain width of straight lines or concentric circles in the form of light and dark composition of the graphic, and then the grating of the present embodiment comprises a parallel linear grating, a concentric circle grating and a 45 ° linear grating.

[0029] When...

Embodiment 2

[0044] The present embodiment for providing a grating-based defect detection apparatus, the defect detection apparatus comprises a transparent object under tested, a grating and a light source set sequentially at intervals from top to bottom, the grating is the grating described in Example 1.

[0045] The light source is used to illuminate the light grid and illuminate the transparent object to be measured through the light grid. The grating is used to make the measured transparent object present its intrinsic texture, distribution and boundary under light, to be observed in the backlight direction of the measured transparent away from the side of the grating, the defect point can be observed with the naked eye or with the help of a magnifying glass, in order to carry out physical detection of the defect point of the measured transparent, including fisheye, lines, scratches, bubbles, cracks, impurities, surface stains or damage points and boundaries.

[0046] The translucency to b...

Embodiment 3

[0052] The present embodiment for providing a grating-based digital imaging apparatus, such as Figure 4 As shown, the digital imaging apparatus comprises a area array industrial camera 1, the transparent object to be measured 3, the light grid 4 and the light source 6 from top to bottom in turn, the light grid 4 is the light grid described in Example 1.

[0053] Light source 6 is used to illuminate the grating 4, and through the grating 4 irradiates the measured transparent 3. Light source 6 emits light 5 such as Figure 4 as shown. Raster 4 is used to make the measured transparent 3 present its intrinsic texture, distribution and boundary under illumination.

[0054] Place the lens and area array industrial camera 1 on the other side of the transparent object to be measured, adjust the focal length and camera parameters to shoot the image, the camera field of view of the area array industrial camera 1 is 2 Figure 4 as shown. Area array industrial camera 1 for imaging the hyalum un...

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PUM

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Abstract

The invention relates to an optical grating and a defect detection and digital imaging device based on the optical grating, by using the optical grating, defects of a whole plane of a transparent object can be completely displayed, an industrial camera can be used for imaging, and basic conditions are created for digital image processing. The grating is characterized in that the grating is a group of bright and dark alternated (such as black and white alternated) patterns which are fully distributed on the whole grating, a light field can be suddenly changed by utilizing the boundary of the bright and dark alternated patterns, so that the defect characteristics of the transparent object are shown, and when the grating and a detected target move relatively, the detected transparent object changes the boundary of a tiny defect due to cutting of suddenly changed background light, and at the moment, the defect characteristics of the transparent object are shown. And images are continuously collected, so that the identification of defect boundaries is continuously reinforced and complete. The method can be applied to many fields of fisheye testers of films or resins, defect online detection, glass defect or boundary online detection, laboratory glass quality detectors and the like, and can generate considerable industrial application and economic benefits.

Description

[0001] This application is a divisional application for a patent application entitled "A Method for Detecting a Raster and Its Area Array for Transparent Defect Spot Detection and Digital Imaging", the filing date of the original application is August 1, 2019, and the application number is 201910706375.2. Technical field [0002] The present invention relates to the field of defect detection technology, in particular to a grating and a grating-based defect detection and digital imaging apparatus. Background [0003] Transparent objects (including translucent substances), such as defects in films, glass, glass tubes, acrylic plates, etc., including fish eyes, stripes, scratches, damage points, cracks, bubbles, impurities, stains and boundaries, all affect the quality of their products. For example, the fisheye detection of transparent films is divided into laboratory sample detection and real-time online detection of the production process. Sample testing in the laboratory is curre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/18G01N21/958
CPCG02B5/1866G02B5/1842G01N21/958G02B2005/1804
Inventor 戴彤宇
Owner 上海塞普机电工程技术有限公司