Absolute distance measurement system for precise 3D positioning

Seongheum Han; Seungman Kim; Jeong-Seok Oh; Seung-Kook Ro; Seung-Woo Kim

doi:10.1117/12.2528389

3 September 2019 Absolute distance measurement system for precise 3D positioning

Seongheum Han, Seungman Kim, Jeong-Seok Oh, Seung-Kook Ro, Seung-Woo Kim

Proceedings Volume 11102, Applied Optical Metrology III; 111021G (2019) https://doi.org/10.1117/12.2528389
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

We have developed an absolute distance measurement system for the three-dimensional (3D) coordinate measurement. The final project goal is to develop a multilateration based coordinate measuring system for precise 3D positioning. This coordinate measuring system consists of an absolute distance measuring system and four laser tracking stations. Accurate positioning become possible by determining coordinates using only four distance values instead of angular measurements that cause major errors in the coordinate measurement. In each station, distance is measured by the absolute distance measurement system. There are several advantages to using absolute distance measurement instead of an incremental-type laser interferometer for 3D positioning. If the beam is accidentally broken, incremental-type devices must measure again from the beginning. However, in the absolute distance measurement, the distance of an object can be measured continuously without such a problem. The other is to improve coordinate measurement precision by reducing the number of variables in the multilateration algorithm. In order to measure high precision 3D position in a large area, we have developed a femtosecond laser based absolute distance measurement system. Two-femtosecond lasers and optical cross-correlation technique are applied to improve precision in the distance measurement. This method enables several micrometer-level distance measurement at distances of a few tens of meters.

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Seongheum Han, Seungman Kim, Jeong-Seok Oh, Seung-Kook Ro, and Seung-Woo Kim "Absolute distance measurement system for precise 3D positioning", Proc. SPIE 11102, Applied Optical Metrology III, 111021G (3 September 2019); https://doi.org/10.1117/12.2528389

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KEYWORDS

Distance measurement

3D metrology

Laser metrology

Optical engineering

Optical systems

Optical systems engineering

Positioning equipment

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