Automatic Guidance Method for Laser Tracker Based on Rotary-Laser Scanning Angle Measurement

Abstract

Laser-tracking measurement systems (laser tracker) have been playing a critical role in large-scale 3D high-precision coordinate measurement. However, the existing visual guidance of laser trackers is still limited by the disadvantages of operator-dependence, small-angle view field, time-consuming laser-guided process. This paper presents an automatic guidance method for laser trackers based on the rotary-laser scanning angle measurement technology. In this method, a special target consisting of six photoelectric receivers and a retroreflector is integrated into the rotary-laser scanning transmitter’ coordinate systems. Real-time constraints calculated by the proposed method would provide the coordinates of the target in a laser tracker coordinates system for guidance. Finally, the experimental results verified the automatic re-establish of sightline can be realized in horizontal 360° angle field within tens of arc-seconds, and this method is robust against the fast movement of the target.

Combined 3D scanning measurement method based on guidance of full-space laser positioning system

“…Common methods include single-system point-cloud acquisition, 10 3D laser scanning, 11 photogrammetric point-cloud acquisition, 12 and structured light scanners 13 . There are also globally guided point-cloud acquisition techniques, 14 laser tracker-guided 3D measurement methods, 15 and techniques based on the triangulation method 16 . Using a single point-cloud acquisition method for smaller amplitude increases the number of splices, consequently amplifying the cumulative error making it challenging to achieve high-precision measurements for large equipment 17 .…”

Evaluation of the Large-Length Indoor Standard Installation Based on Single Point Scanning

“…In a study by Yang et al a laser tracker was combined with a servo control system to greatly improve the performance and stability of the dynamic measurement of the laser tracker [12]. Yang et al proposed a laser tracker automatic guidance method based on the rotating laser scanning angle measurement technique, which proved that the laser tracker has better robustness for fast motion measurement of the target [13]. Wan et al proposed a closed iterative combination weighting method using laser trackers to calibrate and compensate the volumetric errors of machine tools, which provided a research direction for the use of laser trackers to measure high-accuracy linear guides [14].…”