Abstract: Structured light scanning measurement is one of the methods widely used in precision manufacturing. Compared with common measurement methods, it has the advantages of higher point density, point accuracy, and non-contact measurement. Aiming at the shortcomings of conventional structured light scanning measurement, such as small measurement range and time-consuming and cumbersome waypoint teaching, a measurement method combining optical tracker and structured light scanner is proposed. The optical tracker is used to measure the spatial attitude of the structured light scanner in real-time, and the scanned point cloud is converted into the same coordinate system in real-time, realizing real-time measurement of large size, high point density high precision, and non-contact measurement of the reflective surface. The test evaluates the measurement accuracy of this method. The test results show that for a large reflective surface with a diameter of 3.1 m, the best fitting RMSE between the scanning results and the digital-analog is at least 0.067 mm, which is better than the precision of 0.15 mm required for profile manufacturing and can meet the precision requirements of high-precision industrial production.

Key words: optical tracking, structured light, binocular vision, coated reflector, accuracy test