| 摘要 |
PCT No. PCT/EP92/01269 Sec. 371 Date Feb. 2, 1993 Sec. 102(e) Date Feb. 2, 1993 PCT Filed Jun. 5, 1992 PCT Pub. No. WO92/22784 PCT Pub. Date Dec. 22, 1992Method and device for ascertaining the spacing of the center line of curvature of a concave body surface 3a and 5a, which is curved in the shape of a conical envelope, in particular the spacing of the longitudinal center line of a turbine rotor bearing or the central opening in the rim of a turbine impeller wheel from a reference axis. A sharply focussed light beam L, which presets the reference axis, is emitted by a light beam transmitter 6 through the measurement space which faces the body surface 3a and 5a to be measured. This light beam impinges on the measurement field of a photo-electronic position detector rigidly fastened at a sensing device 7. The sensing device 7 is supported in stable manner and displaceably on the body surface 3a and 5a to be measured and is rotated about the center line of curvature of the body surface through displacement of its supported end in the direction of curvature on the body surface. The position detector in that case supplies electrical signals which correspond to the instantaneous position of the point of incidence of the light beam on the measurement field. The signals are detected for at least three measurement points situated at an angular spacing and fed into a computer C, which on the basis of these signals as well as further data entered into it computes the spacing of the center line of curvature from the reference axis. Correction data for the production of the state of alignment of these body surfaces are derived from the spacings ascertained for several body surfaces 3a and 5a.
|
