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.
Highlights
Benefiting from the outstanding advantages of high-precision, long-range, portable, and simple operation, laser trackers are widely used in many industrial fields such as aircraft manufacturing [1], satellite assembly [2], and large-scale gas turbine building [3]
We proposed a novel automatic guidance method for laser trackers based on the technology of rotary-laser scanning
The novel automatic guidance method for laser trackers proposed in this paper suits all laser trackers with Absolute Distance Measurement (ADM)
Summary
Benefiting from the outstanding advantages of high-precision, long-range, portable, and simple operation, laser trackers are widely used in many industrial fields such as aircraft manufacturing [1], satellite assembly [2], and large-scale gas turbine building [3]. The shortcoming is obviously its low efficiency from manual operation, complex calibration, and increasing cost [4,5] It has been a long-term concern for researchers to search for an affordable automatic detection and guidance method for multiple retroreflectors to improve the laser tracker’s multi-target measurement capability in the field of large-scale coordinates measurement. IGPS and wMPS adopt a similar working principle with farther measurement distance, and they support multiple targets measurement They both consist of a set of rotary-laser transmitter and photoelectric receivers. 2. Principles and Methods including the reason why laser trackers need an automatic guidance method, and the working principle of wMPS, shows the multi-point real-time searching ability in horizontal full. Coordinate system definitions of the two main equipment prepare for the guidance principle and experiments description
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