| 摘要 |
PCT No. PCT/SE83/00209 Sec. 371 Date Jan. 3, 1984 Sec. 102(e) Date Jan. 3, 1984 PCT Filed May 26, 1983 PCT Pub. No. WO83/04303 PCT Pub. Date Dec. 8, 1983.The invention relates to apparatus for measuring the dimensions of cylindrical objects by means of a scanning laser beam which is directed from a source (1) of laser light onto a rotating mirror (2) and through a first lens (6) located a focal-length distance from the center of rotation of the mirror. The beam is arranged to sweep over one side of the object (7) and is reflected onto the rotating mirror from where it is reflected onto a light detector (11) arranged to control a data processor (12), which determines and indicates the sensed dimension. The apparatus includes means (2,10,9,8) for directing the laser beam onto and to sweep the same over the other, opposite side of the object (7). During one revolution of the mirror the beam will therewith, during one half of a mirror revolution, sweep over a first side of the object, and will sweep over the other side of the object during the other half of the mirror revolution. The data processor formulates the mean value of the measuring values sensed on the one and the other side of the object, thereby substantially eliminating measuring errors. |
