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Thread defect detecting method and device based on linearly polarized light

A technology of linearly polarized light and defect detection, which is applied in the direction of measuring devices, optical devices, and optical testing of defects/defects, can solve problems such as the inability to correctly detect the number of threads, thread length defects, missing thread profile features, etc., to achieve convenience Image processing and analysis, reduction of image processing time, effect of reducing bright spots

Inactive Publication Date: 2019-02-26
CHANGAN UNIV
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Problems solved by technology

It adopts LED backlight and detects defects based on thread angle measurement, but its disadvantages are: due to uneven thread surface and different reflection ability to light, it is easy to produce many bright spots after being illuminated by LED backlight. The contour features of the thread will be lost in the image, and the number of threads and the length of the thread cannot be detected correctly

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  • Thread defect detecting method and device based on linearly polarized light
  • Thread defect detecting method and device based on linearly polarized light
  • Thread defect detecting method and device based on linearly polarized light

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, which are only used to explain the present invention, rather than limit the protection scope of the present invention.

[0031] see figure 1 as well as figure 2 , the present invention proposes a thread defect detection device based on linearly polarized laser, including an area array CCD image sensor 6, a storage platform 7, an image acquisition card 8 and a computer 9; wherein, the area array CCD image sensor 6 includes an area array CCD camera 1 (MTV-1881EX-3, black and white, low illumination, high resolution), manual aperture fixed-focus lens 2, anti-disturbance filter 3, hood 4 and laser linearly polarized light source 5; manual aperture fixed-focus lens 2 The imaging specification is consistent with the target surface specification of the area array CCD camera 1, and the manual aperture fixed-focus lens 2 and the area array CCD camera 1...

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Abstract

The invention discloses a thread defect detecting method and device based on linearly polarized light. The device comprises an image sensor, a storage platform, an image acquisition card and a computer, wherein the image sensor comprises a planar array CCD camera, a manual iris prime lens, a shape-cut filter, a lens hood and a linearly polarized light source; a to-be-detected fastener with a thread is placed under the image sensor and located in the center of the storage platform; the image acquisition card is connected with the computer and the planar array CCD camera in the image sensor through tail circuits, grayscale images, acquired by the image acquisition card, of the fastener are analyzed and processed by the computer, and detection of thread lack, thread missing and thread lengthdefects of the fastener is realized by an algorithm. Image processing time is reduced, and non-contact automatic thread defect detection can be realized.

Description

technical field [0001] The invention belongs to the field of fastener defect detection, in particular to thread defect detection based on linearly polarized laser. Background technique [0002] As a common mechanical part, fasteners are widely used in manufacturing industries such as machinery, automobiles, and aircraft. Fastener thread defects will directly affect its performance and lead to various safety hazards. Individual defective fasteners must be removed before they are put into use to avoid unforeseen consequences. At present, the thread defects of fasteners are still in the stage of manual visual inspection, which is not only inefficient, but also prone to false detection and missed detection. With the transformation of the manufacturing industry towards high-speed, large-volume, and automated models, the traditional fastener thread detection technology has been unable to meet the needs of modern industrial production. It is urgent to develop an efficient and low-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88G01N21/95G01B11/03
CPCG01B11/002G01B11/03G01N21/8806G01N21/8851G01N21/95G01N2021/8848G01N2021/8861G01N2021/8874G01N2021/8887
Inventor 马荣贵谭珂张美月徐康王梦菲高洁
Owner CHANGAN UNIV
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