Rotation laser for perpendicularity measurement of large components

摘要

The laser (1) has deflection prism (2), driven by an electric motor for rotation of the laser beam (4) about a longitudinal axis, with detection of the beam by receivers (6) attached to each of the perpendicular components (9). Two or more relatively rotatable polarisation filters (5) lie in the path of the laser beam, one of the filters attached to the housing of the laser device, the other rotated in conjunction with the deflection prism.