| 摘要 |
<p>Calibration of measuring apparatus such as a co-ordinate measuring machine (CMM) (10) is provided. The CMM (10) is mounted on a pallet (14) which is movable to measuring positions (16) to allow a large object (12) to be measured. Laser trackers (20) at fixed positions (18) track a retro device (22) which can move between three points (24) on the pallet (14). By maintaining the beam as the retro (22) moves around the points (24), and as the pallet (14) moves around the positions (18), the relative positions and orientations of the pallet can be accurately determined, to calibrate the CMM measurements. Movement of the retro (22) creates a notional calibration artefact. Other arrangements described use of a physical calibration artefact.</p> |
