研究目的
To propose and validate two methods for calibrating the length of a three-sphere scale bar using a laser tracker for the evaluation of Terrestrial Laser Scanner (TLS) performance per the ASTM E3125-17 standard.
研究成果
The FOTF and comparison methods provide accurate and convenient ways to calibrate the three-sphere scale bar length for TLS performance evaluation per the ASTM E3125-17 standard. The FOTF method is particularly useful for horizontal orientations, while the comparison method can be used for any orientation. Both methods have been validated against the LOS method, showing results within a few micrometers.
研究不足
The FOTF method is limited to calibrating the scale bar in a horizontal orientation. The comparison method, while applicable to any orientation, requires careful alignment to ensure the range, horizontal, and vertical angles to the measured points are the same for both the test and master bars.
1：Experimental Design and Method Selection:
The study proposes two methods, the four-orientation and two-face (FOTF) method for horizontal orientation and the comparison method for any orientation, to calibrate the scale bar length using a laser tracker.
2：Sample Selection and Data Sources:
The three-sphere scale bar and another 2.3 m long nominal scale bar with SMR nests at both ends were used as test and master bars, respectively.
3：3 m long nominal scale bar with SMR nests at both ends were used as test and master bars, respectively.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Laser tracker, three-sphere scale bar, SMRs, and a master bar with SMR nests.
4：Experimental Procedures and Operational Workflow:
The FOTF method involves measuring the scale bar from four orientations of the laser tracker and averaging the results. The comparison method involves measuring the test and master bars in direct and line-of-sight (LOS) modes to correct for systematic errors.
5：Data Analysis Methods:
The study compares the results from the proposed methods with those from the LOS method to validate their accuracy and discusses the uncertainty budgets for each method.
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