| 摘要 |
PURPOSE:To measure the outer diameter and center position of a tube only by one detecting part with high accuracy by rotating the detecting part consisting of a light projecting part and a light receiving part, continuously detecting distances from detecting points and rotational angles and computing these data. CONSTITUTION:A detecting part 10 consists of a light projecting part 12, a light receiving part 14 and a detecting part 16 and is set up so as to be rotated by a prescribed rotating machine and a range finder 22 and an arithmetic unit 23 are connected to the detecting part 10. On the other hand, a laser beam reflecting plate 20 is arranged on the back of a pipe 18. The distance between the detecting part 16 and the pipe 18 is continuously measured by rotating the detecting end 10 and a minimum value (x) is calculated. A rotational angle obtained at the time of changing measuring light from the pipe 18 to the reflecting plate 20 and that obtained at the time of changing the measuring light from the reflecting plate 20 to the pipe 18 are found out. The outer diameter and the center position of the pipe 18 are calculated by the arithmetic unit 23 based on the minimum distance and the rotational angles. Thereby, the outer diameter and the center position of the pipe can be accurately obtained only by one detecting end 10 through an on-line operation.
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