A method for making a special 18% gray card for visual inspection of nuclear equipment

Abstract

The invention discloses a making method of an 18-percent grey chip for the visual detection of a nuclear device. The making method comprises the following steps of A, drawing a standard neutral-grey rectangular graph by adopting computer graphic software, drawing a black comparison line in the neutral-grey rectangular graph, and then converting a well drawn 18-percent grey primary color parametricmode graphic document into a grey level mode graphic document to carry out storage; B, selecting high-glossy photographic paper as printing paper, and carrying out electrostatic removal treatment onthe printing paper; C, printing a standard neutral grey chip by adopting a black-and-white laser printer; D, carrying out oxygen-free drying and color fixing treatment on the well printed standard neutral grey chip, and then cutting into a grey chip; E, carrying out grey level measurement on the grey chip, and metering the width of the black comparison line. The making method, through reasonably designing making steps, optimizing a used making device and adopting an original process, is used for effectively improving the grey level accuracy and the line width accuracy of the black comparison line when the grey chip is printed, and meanwhile, is used for greatly improving the percent of pass and prolonging the service life of a product through the oxygen-free drying and color fixing treatment and a detection procedure.

Description

technical field [0001] The invention relates to a preparation method of a nuclear equipment visual inspection tool, in particular to a preparation method of a special 18% gray card for nuclear equipment visual inspection. Background technique [0002] Visual inspection technology is an extremely important non-destructive testing method in the design, construction and operation of nuclear equipment. It is the first inspection process of all non-destructive testing methods. Vibration, corrosion, misalignment and surface defects of welded parts. According to the relevant standards of the nuclear industry, visual inspection requires the use of a special 18% gray card for visual inspection to confirm the inspection environment and the visual recognition ability of the operator to ensure the accuracy and effectiveness of the inspection results. Therefore, the standardized use of the 18% gray card that meets the requirements of the standard is the basis for the effectiveness and a...

AI Technical Summary

Problems solved by technology

[0003] However, at present, there is no 18% standard gray card specially used for visual inspection of nuclear equipment in the industry, which makes most users can only purchase gray boards from the photography industry for cutting and hand-painted wire diameters for use, because there is no relevant metrological verification certificate As an effective support for the application, there are problems such as whether the gray scale of the background color of the gray card meets the 18% requirement stipulated in the standard and the compliance of the actual size of the hand-painted wire diameter, making it difficult to guarantee the visual inspection effect of nuclear equipment.