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| Baseline Field Experiments for the High Accuracy Baseline Verification Instrument μ-base |
| BAO Huan,ZHAO Dong-ming,WANG Ruo-pu,FU Zi-ao,XUE Ying |
| Information Engineering University, Zhengzhou, Henan 450001, China |
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Abstract The performance of the high accuracy baseline verification instrument μ-base is described and this experiments was made through comparison at the baseline field of National Institute of Metrology. Two stationing methods and a high accuracy centering method of the spherical prism were detailed, and the emphasis were laid on the tests of repeatability and reproducibility for the two instruments. From analysis on the data collected in the experiments, it is showed that the repeatability of the two instruments is no more than 5μm, and the reproducibility is less than 0.1mm. Comparisons with the measurements carried out with Invar tape on the same baseline, the feasibility of the use of μ-base in the verification of the baseline of length is justified, and furthermore, it is proved that μ-base can work properly under different environmental conditions with highest level of accuracy and precision.
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2014, Vol. 35 
