Laser tracker precision on-site evaluation system based on multi-station method

Abstract

The invention discloses a laser tracker precision on-site evaluation system based on a multi-station method. The laser tracker precision on-site evaluation system comprises measuring point motion driving equipment, a plurality of laser trackers and a precision evaluation calculating device, wherein the laser trackers track and measure measurement coordinates of each target point on the measuring point motion driving equipment under a laser tracker coordinate system B and absolute measurement distances from the laser trackers to the target points; the precision evaluation calculating device calculates first spatial position coordinates of the target points under a coordinate system A of the measuring point motion driving equipment according to the absolute measurement distances from the laser trackers to the target points; coordinate transformation is carried out to obtain second spatial position coordinates under the coordinate system B; and a difference value between a measurement coordinates of the target points and the second spatial position coordinates are calculated, and laser tracker measurement angle and measurement length precision evaluation can be obtained by adopting aprobabilistic method. The laser tracker precision on-site evaluation system has the advantages of being high in measurement speed, low in cost and the like in laser tracker precision on-site evaluation, and has higher on-site practicability and operability in measurement equipment with a theoretical coordinate position or a three-coordinate space precision detection process.

Description

technical field [0001] The invention relates to the field of precision detection and calibration of a laser tracker, in particular to an on-site evaluation system for the precision of a laser tracker based on a multi-station method. Background technique [0002] The laser tracker is an important large-scale space measurement datum, and has a wide range of applications in the geometric measurement of large-scale parts, assembly, and intelligent manufacturing equipment. The error of the laser tracker has a great influence on the measurement results, especially in the process of equipment / three-coordinate space accuracy detection. Therefore, it is necessary to evaluate the accuracy of the laser tracker to provide a reference for its high-precision measurement. [0003] In the detection process of intelligent manufacturing equipment, the accuracy of the laser tracker has a great influence on its spatial accuracy detection, especially the angular accuracy of the laser tracker. ...

AI Technical Summary

Problems solved by technology

Or use a three-coordinate measuring machine to track the calibration method of the measurement system, which requires additional testing equipment, and has high requirements for the accuracy of the three-coordinate measuring machine, which is not suitable for on-site measurement

In addition, most of the detection methods for intelligent manufacturing equipment using laser trackers require self-calibration, resulting in low measurement accuracy of spatial position coordinates, and accurate on-site evaluation of laser tracker accuracy cannot be performed

The above methods all require additional high-precision calibration equipment, and the accuracy evaluation of the laser tracker needs to be carried out under laboratory conditions, which is costly and time-consuming

In addition, the current method of using trackers to detect the spatial accuracy of intelligent manufacturing equipment has low accuracy and is not suitable for on-site evaluation of laser tracker accuracy in the process of equipment accuracy inspection.

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