研究目的
To determine the azimuth angle encoder errors of a laser tracker and verify their values stored in the tracker’s internal error map using different methodologies.
研究成果
All three methodologies agree within their respective measurement uncertainties. The NPL network technique offers advantages in terms of measurement time and the lack of need for specialised equipment, making it a practical choice for determining laser tracker angle encoder errors.
研究不足
The NIST technique requires a calibrated artefact and is time-consuming. The precision angular indexing table technique requires specialised equipment. The NPL technique, while faster and not requiring specialised equipment, may have higher uncertainties.
1：Experimental Design and Method Selection:
Three methodologies were evaluated: the NIST artefact-based technique, the NPL multi-target network technique, and the precision angular indexing table technique.
2：Sample Selection and Data Sources:
A laser tracker was used to measure a fixed horizontal length, a network of targets, and a target on a precision angular indexing table.
3：List of Experimental Equipment and Materials:
Laser tracker, carbon fibre artefact, precision angular indexing table, target nests.
4：Experimental Procedures and Operational Workflow:
Each methodology involved specific measurement procedures, including rotating the tracker base, measuring targets, and data acquisition using Spatial Analyzer.
5：Data Analysis Methods:
Non-linear optimisation algorithms were used to fit measurement data to geometric models and estimate angle encoder errors.
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