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Construction of a robust three-degree-of-freedom laser measurement system for measuring motion error of long-travel linear stages
Author(s): Yindi Cai; Qi Sang; Binhe Yang; Baokai Feng; Kuang-Chao Fan
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Paper Abstract

This paper presents a robust and low-cost three-degree-of-freedom laser measurement system (3DOFLMS) that can measure both straightness error and roll angular error of long-travel linear stages. A low-cost laser diode is adopted as the laser source. A beam drift compensation module is employed to improve the stability of the 3DOFLMS. The relationships between the sensitivity of detector, the dual-beam parallelism and the measurement distance along the laser propagation direction are theoretical analyzed. Compensation methods are then proposed for eliminating the effects of detector sensitivity variation, beam drift and misalignment on the accuracy of the measurement system. The effectiveness of the compensation methods and the feasibility of the designed measurement system are demonstrated by a series of experiments. With the comparisons between commercial measurement instruments and the proposed measurement system in the measurement distance up to 1 m, the measurement accuracy of straightness errors and roll angular error are within ±1.0 μm and ±1.2 arcsec, respectively. The designed measurement system is very easy to construct both in the laboratory environment and in the actual measurement environment.

Paper Details

Date Published: 13 November 2019
PDF: 6 pages
Proc. SPIE 11343, Ninth International Symposium on Precision Mechanical Measurements, 1134320 (13 November 2019); doi: 10.1117/12.2548881
Show Author Affiliations
Yindi Cai, Dalian Univ. of Technology (China)
Qi Sang, Dalian Univ. of Technology (China)
Binhe Yang, Dalian Univ. of Technology (China)
Baokai Feng, Dalian Univ. of Technology (China)
Kuang-Chao Fan, Dalian Univ. of Technology (China)


Published in SPIE Proceedings Vol. 11343:
Ninth International Symposium on Precision Mechanical Measurements
Liandong Yu, Editor(s)

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