Large-aperture element edge detection method based on object distance focusing method

Abstract

The invention discloses a large-aperture element edge detection method based on an object distance focusing method, relates to the technical field of engineering optics, and is used for solving the problem that a global clear focusing position cannot be obtained before an image is acquired in the prior art. According to the technical key points, the method comprises the following steps: respectively moving a plurality of edges of an element into a view field of a camera, changing an object distance, and acquiring a plurality of images corresponding to each edge under different focal planes; performing automatic clear focusing on each edge according to the variance change curve of the plurality of images corresponding to each edge; after the focusing is completed, collecting a plurality of images including each edge, and processing the plurality of images to obtain the positions of the plurality of edges; wherein the edge automatic focusing strategy is designed to perform automatic focusing according to the variance change curve of the image, so that the obtained edge image is clearer, and the edge coordinate position of the element can be obtained more accurately. The method is easy to realize automation and can be used for edge detection of large-aperture elements.

Description

technical field [0001] The invention relates to the technical field of engineering optics, in particular to an edge detection method for large-diameter components based on an object distance focusing method. Background technique [0002] The construction of high-power solid-state laser devices requires a large number of optical components. These components are prone to surface damage in a strong laser environment, and the damage will weaken the material properties and further aggravate the damage process. Studies have shown that if the damage is not repaired or suppressed in time, the size of the damage on the front and back surfaces of the component will increase linearly and exponentially under laser irradiation, respectively. In addition to further aggravating the damage of the component itself, the damage will also reduce the quality of the beam passing through the component and affect the quality of the focal spot. It will modulate the optical field to form a strong are...

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the present invention proposes a large-aperture component edge detection method based on the object distance focusing method to solve the problem that the prior art cannot obtain a global clear focus position before collecting images

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