Study on calibration and error compensation of laser scanning system

Based on the measurement principle of laser triangulation, error affecting factors considering the surface characteristics of measured object (including inclination angle, incident rotation angle, incident swing angle, etc.) is analyzed. The influence rules of error sources on the detection accuracy of the system are discussed, and a compensation algorithm for improving the detection accuracy is worked out. Taking the calibration of standard bar geometry center as an example, the measured values in machine reference frame are obtained through the coordinate conversion, and three calibration schemes are formulated: 1) When the measuring plane of the laser sensor is vertical and parallel to the axial direction of the standard rob respectively (that is, the installation rotation angles are 0 degrees and 90 degrees respectively), the laser sensor scans horizontally within the measurement range, the laser sensor measurement is used as the measurement value, and after obtaining the compensation from the above compensation algorithm, the standard rod center coordinates are obtained; 2) The position of the laser sensor is stable at the measurement center distance of the laser (that is, the displacement is 0), the displacement grating value of the coordinate measuring instrument is read as the measured value, and the standard bar center coordinates is obtained through the coordinate transformation theory; The accuracy of the above three measurement schemes is compared, the feasibility and accuracy of the theory are verified, which lays a foundation for the research and development of the measurement system.