| 摘要 |
PROBLEM TO BE SOLVED: To provide a more precise inspection method for inspecting the thickness of a building material, in an inspection method for detecting a flat top part as the thickness of a sheetlike building material on the upper face of which a groove pattern is formed. SOLUTION: The surface shape of a building material 1 is measured with a displacement sensor 6 while moving the one building material 1 relatively, the space between the upper face 4 and a lower face 5 is taken into a data processor as thickness data based on the shape, the data are rearranged in order according to their sizes to obtain a displacement curve 21, and the displacement curve 21 is partitioned thereafter into a noise component A, a thickness component B in the top part and other thickness components C including a groove from its large value side, so as to detect the thickness component B in the top part.
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