| 摘要 |
Process and device for determining the distance of the curvature centre-line of a concave, cone-envelope-shaped curved surface (3a, 5a) of a body, especially the distance of the longitudinal centre-line of a turbine rotor bearing or the central aperture in the crown of a turbine stator, from a reference axis. A light beam transmitter (6) sends a precise light beam (L) through the measuring chamber facing the body surface (3a, 5a). This beam impinges on the measuring region of a photoelectronic position detector rigidly secured to a sensor device (7). Said sensor device (7) is supported on the body surface (3a, 5a) to be measured so that it can move but not tilt and is turned in the direction of curvature on the surface of the body about its centre-line of curvature by moving its supported end. The position detector supplies electrical signals corresponding to the momentary position of the point of impingement of the light beam on the measuring region. The signals for at least three angularly spaced measuring points are detected and fed into a computer (C) which, on the basis of these signals and other data supplied to it, calculates the distance of the axis of curvature from the reference axis. Correction data are derived from the distances found for several body surfaces (3a, 5a) for producing the state of alignment of these body areas. |
