Method of improving large-scale measurement accuracy of laser tracker based on photogrammetry

Chengyang Zhang,Xishuang Jing,Gang Zhao,Siyu Chen,Jiarong Zou,Xuanzhe Ling

doi:10.1177/0020294018813644

Chengyang Zhang, Xishuang Jing + Show 4 more

Open Access

https://doi.org/10.1177/0020294018813644

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Abstract

Background: When performing the spatial large-scale measurements, the measurement accuracy of laser tracker would decreased with the increase of the measurement distances due to the refraction difference of most optical digital measurement devices. Therefore, this paper proposed a method based on photogrammetry system to improve the large-scale measurement accuracy of the laser tracker. Purpose: The purpose of this method is to improve the large-scale measurement accuracy of the laser tracker by considering the advantages of photogrammetry system such as high measurement accuracy and good portability. Methods: The measurement data from the photogrammetry system would be used as a reference to do correction on measurement results from laser tracker. The coordinate correction method based on Rodrigues’ rotation formula has been discussed. The measurement accuracy of the long-distance point of laser tracker can be significantly improved through the coordinate correction method. Conclusion: Based on the advantages of using photogrammetry system, the proposed method can achieve higher accuracy when measuring the common points at a closer distance than the laser tracker can do when measuring objects far away from instrument. The feasibility of the proposed method has been demonstrated by experiment.

Highlights

Laser tracker is a portable three-dimensional measurement system and is widely used in various fields such as the aviation, aerospace, automotive, and shipbuilding areas due to the high measurement accuracy and efficiency.[1]
We have used the photogrammetry system to measure the point farther away from the laser tracker to obtain a measurement value with relatively high accuracy and utilized the coordinate correction method based on the Rodrigues rotation formula to correct the measured value by the laser tracker to improve the measurement accuracy of the large-scale product
With the assistance of photogrammetry and the coordinate correction method based on the Rodrigues rotation formula, the measurement results of the measurement point in the laser tracker are corrected, and the measurement accuracy of the laser tracker for the long distance point is improved

Summary

Introduction

Laser tracker is a portable three-dimensional measurement system and is widely used in various fields such as the aviation, aerospace, automotive, and shipbuilding areas due to the high measurement accuracy and efficiency.[1]. In order to improve the measurement accuracy of measurement points, this paper introduces the photogrammetry system in the large-scale measurement process by the laser tracker.

Results

Conclusion