| 摘要 |
PROBLEM TO BE SOLVED: To enable accurate measurement of the amount of unevenness on the basis of a healthy region surface to an object to be measured having tubing peripheral direction or two-dimensional distribution, and obtain the amount of unevenness simply from measured amount of displacement without performing highly precise positioning to the piping. SOLUTION: A scanning unit A comprises a primary scanning mechanism 3 for driving primary scanning means which is provided with a rectilinear rail 1 arranged in a tube axis P<SB>O</SB>direction to a measured region S, and a displacement gauge 2; and a secondary scanning mechanism 5 which holds both ends of the rail 1 by a pair of belt 4 wound along the peripheral direction of the piping P, and moves the rail 1 being in parallel for every 1 scanning unit, along the peripheral direction of the piping P, By the primary scanning means and the second scanning mechanism 5, two-dimensional scanning is performed. Measuring data are subjected to arithmetic operation by an arithmetic operation part B and its output is displayed on indication C. The arithmetic operation part B is equipped with a data storage means 8 for storing data of the amount of displacement, and an arithmetic operation means 9 for obtaining the amount of unevenness for each scanning position. COPYRIGHT: (C)2004,JPO
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