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Accuracy enhancement and joint calibration method of multi-station triangulation network based on absolute ranging
Applied Optics
|June 10, 2024
Summary
This study enhances 3D coordinate measurement accuracy in manufacturing by integrating distance measurements into triangulation networks. This improves depth direction precision, crucial for large-scale component alignment and quality control.
Area of Science:
- Metrology and Measurement Science
- Mechanical Engineering
- Advanced Manufacturing Technologies
Background:
- Precision measurement of large-scale 3D coordinates is critical for advanced manufacturing.
- Rotary-laser scanning systems offer high precision and automation but struggle with depth accuracy, especially at greater distances.
- Existing methods lack sufficient accuracy in the depth dimension for critical applications.
Purpose of the Study:
- To improve the depth direction positioning accuracy of multi-station triangulation measurement systems.
- To develop a novel method integrating absolute distance measurements to overcome triangulation limitations.
- To introduce a joint calibration method for multi-type stations without external references.
Main Methods:
- Integration of a distance measurement station into a rotary-laser scanning network.
- Development of a cooperative target and high-dynamic beam guidance for fast absolute distance measurement.
- Weighted fusion of distance and angle observations for enhanced accuracy.
- Joint calibration of extrinsic parameters for multi-type stations using optical and physical scale bars.
Main Results:
- The proposed method significantly enhances measurement accuracy, particularly in the depth direction.
- The root mean square error of measured points was reduced to 42.6% compared to the standard triangulation method.
- The joint calibration method effectively calibrates multi-type stations without needing external instruments like laser trackers.
Conclusions:
- The integration of distance measurement stations and a novel cooperative target effectively addresses the depth accuracy limitations of triangulation systems.
- The developed joint calibration method provides a robust and self-contained solution for multi-type station calibration.
- This approach offers a significant advancement in high-precision 3D coordinate measurement for large-scale industrial applications.
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