AREA RATIO MEASURING INSTRUMENT OF CORROSION PART FOR SURFACE-TREATED STEEL PLATE, AND METHOD AND INSTRUMENT FOR MEASURING AREA RATIO OF WHITE RUST PART OF GALVANIZED SHEET

摘要

PROBLEM TO BE SOLVED: To enhance the discrimination capacity of a corrosion part and a sound part, using an optical system capable of observing the corroded part of a corrosion test piece, with proper contrast and with identical contrast for all the points on the test piece, and to calculate the area ratio of the corroded part, or the like, with high accuracy by further combining image processing.;SOLUTION: This area ratio measuring instrument of the corroded part of a surface treated steel plate is equipped with an illumination device 2 for illuminating the steel plate test piece 1 with light, at a predetermined incident angle, from one direction of a plurality of directions; a linear stage 4 for moving the steel plate test piece 1 in a predetermined direction; a linear array camera 3 for imaging the reflected luminance pattern in the moving direction or the direction of crossing it at right angles of the surface of the steel plate test piece 1; an image memory 5 for successively reading the reflected luminance patterns, imaged by the linear array camera 3 for accumulating and imaging the same; and an area ratio measuring instrument 6 for processing the image, obtained by the image memory 5 for measuring the area ratio of the corrosion part or a white rust part.;COPYRIGHT: (C)2008,JPO&INPIT