Abstract: For the purpose of measuring middle and small workpieces with complex surfaces in a rapid, precise and efficient manner, a non-contact optical coordinate measuring machine based on the laser displacement sensor and coordinate measuring machine is established, which combines the advantages of CMM and optical sensor together to deal with the measurement of sculptured surfaces. Through calibration, the unit vector of the measuring beam of the sensor can be derived, which can be used to transform the one-dimensional length of the laser beam to the three-dimensional coordinates of the laser point on the surface. And then the coordinates of measuring points can be converted to the same coordinate system of the CMM to complete the construction of the data clouds. Finally, a metallic sphere whose diameter is 50mm is measured by the system at 10 different orientations. Through the least squares fit of the data cloud, the measuring errors are all smaller than 0.05mm, which manifests the validity of the system set up.

Key words: Coordinate measuring machine, Non-contact, Optical sensor