Mobile large scale 3D coordinate measuring system based on network of rotating laser automatic theodolites

Zhigang Liu; Zhongzheng Liu; Jianwei Wu; Yaozhong Xu

doi:10.1117/12.885889

28 December 2010 Mobile large scale 3D coordinate measuring system based on network of rotating laser automatic theodolites

Zhigang Liu, Zhongzheng Liu, Jianwei Wu, Yaozhong Xu

Author Affiliations +

Proceedings Volume 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation; 75446P (2010) https://doi.org/10.1117/12.885889
Event: Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 2010, Hangzhou, China

Abstract

This paper presents a mobile 3D coordinate measuring system for large scale metrology. This system is composed of a network of rotating laser automatic theodolites (N-RLATs) and a portable touch probe. In the N-RLAT system, each RLAT consists of two laser fans which rotate about its own Z axis at a constant speed and scan the whole metrology space. The optical sensors mounted on the portable touch probe receive the sweeping laser fans and generate the corresponding pulse signals, which establish a relationship between rotating angle of laser fan and time, and then the space angle measurement is converted into the corresponding peak time precision measurement of pulse signal. The rotating laser fans are modeled mathematically as a time varying parametrical vector in its local framework. A two steps on-site calibration method for solving the parameters of each RLAT and coordinate transformation among the N-RLATs. The portable probe is composed of optical sensors array with specified geometrical features and a touch point, on which the coordinates of optical sensors is determined by the N-RLATs and the touch point is estimated by solving a non-linear system. A prototype mobile 3D coordinate measuring system is developed and experiment results show its validity.

Citation Download Citation

Zhigang Liu, Zhongzheng Liu, Jianwei Wu, and Yaozhong Xu "Mobile large scale 3D coordinate measuring system based on network of rotating laser automatic theodolites", Proc. SPIE 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 75446P (28 December 2010); https://doi.org/10.1117/12.885889

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