研究目的
Investigating the performance evaluation methods and procedures for Terrestrial Laser Scanners (TLS) as per the ASTM E3125-17 standard.
研究成果
The study successfully realizes the ASTM E3125-17 test procedures for TLS performance evaluation. The results show that the two-face errors are between 0.2 mm and 1.2 mm, the errors in the scale bar length tests are less than 0.5 mm, the measurement error of the TLS for the inside test is less than 0.15 mm, and the errors in the relative-range tests are smaller than 0.15 mm. The uncertainties in the test values are also presented, which are critically important for assessing the conformance of the test results.
研究不足
The study does not attempt to fit the observed errors to a TLS error model to explain the cause. Additionally, the MPE specifications are not yet available for the TLS evaluated, so conformance decisions cannot be made.
1：Experimental Design and Method Selection:
The study involves the realization of test procedures per the ASTM E3125-17 standard for TLS performance evaluation. It includes two-face tests and point-to-point distance tests (symmetric, asymmetric, inside, relative-range, and user-selected tests).
2：Sample Selection and Data Sources:
The study uses sphere targets and a plate-sphere artifact for the tests. The sphere targets are scanned directly and through reflections from mirrors for two-face tests. The plate-sphere artifact is used for relative-range tests.
3：List of Experimental Equipment and Materials:
Includes a laser tracker (LT) as the reference instrument, an aluminum sphere target of nominal diameter 200 mm, a three-sphere scale bar, and a plate-sphere artifact.
4：Experimental Procedures and Operational Workflow:
Detailed procedures for conducting two-face tests, symmetric and asymmetric length tests, inside test, and relative-range tests are described. The procedures include scanning the targets, calculating the derived-point coordinates, and comparing the results with reference values.
5：Data Analysis Methods:
The study involves calculating the errors in the measured distances and analyzing the uncertainties in the test values. The uncertainties are calculated based on the contributions from the laser tracker, concentricity of the targets, and thermal effects.
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